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Wyświetlanie 1-15 z 131
Tytuł:
Effect of potassium and micronutrient foliar fertilisation on the content and accumulation of macroelements, yield and quality parameters of potato tubers
Autorzy:
Gaj, R.
Chudzinska, E.
Borowski-Beszta, J.
Spychalski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1192260.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
potato varieties
nutrient uptake
specific uptake
Opis:
The experiment was conducted in 2014-2016, on a farm located in western Poland. The aim was to evaluate the effect of foliar application of potassium sulphate (SOP) and micronutrients (Zn, Cu, Mn and B) on the content and accumulation of macroelements (N, K, Mg and S) in tubers at the stage of technological maturity. Two potato varieties tested in the experiment, Zorba and Hermes, are used to produce French fries and crisps, respectively. Analyses involved data from four trials, including the control where solely NPK fertilisation was applied. The other trials included: (I) double foliar treatment with SOP in the combined dose of 8.6 kg K ha-1; (II) double foliar treatment with micronutrients: 12 g Zn ha-1, 12 g Cu ha-1, 300 g Mn ha-1, and 500 g B ha-1, and (III) combined application of SOP and micronutrients on two scheduled terms. The experiment was arranged in a randomised block design with four replicates for each potato variety. The experimental factor differentiated the content and uptake of macroelements, being largely controlled by changing weather conditions. Averaged across the three study years, values of nutrient accumulation in tubers showed that foliar fertilisation with potassium and micronutrients enhanced tuber K accumulation. The increase in tuber nutrient accumulation owing to foliar fertilisation was higher in the crisps variety compared to the French fries one. The regression analysis showed that the tuber yield was in 65-87% controlled by the accumulation of macroelements (N, K, Mg and S). Moreover, the protein content in both varieties was largely determined by the accumulation of macroelements in tubers, while significant relationships for the starch content were noted only in the case of the Zorba variety.
Źródło:
Journal of Elementology; 2020, 25, 3
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FACTORS INFLUENCING LECTURER UPTAKE OF E-LEARNING
Autorzy:
Fresen, Jill W.
Powiązania:
https://bibliotekanauki.pl/articles/941149.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej w Lublinie. IATEFL Poland Computer Special Interest Group
Tematy:
e-learning
lecturer uptake
Opis:
This paper reports on two research projects, one completed and a partial follow-up study in the early stages of investigation. The first study investigated a range of factors that directly affect the quality of web-supported learning opportunities. The outcome of that study is a taxonomy of critical success factors for quality web-supported learning based on six categories: institutional factors, technical factors, pedagogical factors, instructional design factors, lecturer factors and student factors. The new study takes as starting point one of the categories of the taxonomy, namely lecturer factors. Using appropriate media effectively should be seen as part of the development of personal and teaching proficiencies. However the literature reveals that there remain various barriers to academics adopting learning technologies as a matter of course in their practice and that the uptake of institutional e-learning systems remains in the hands of enthusiasts. Academics need to be supported in investigating the use of appropriate technology to enhance and expand their teaching practices. A research study is underway at Oxford University (UK) to determine the level of uptake of the virtual learning environment, as well as the barriers and limitations that academic staff encounter in moving forward along the technology adoption curve (Moore, 1999).
Źródło:
Teaching English with Technology; 2011, 11, 1; 81-97
1642-1027
Pojawia się w:
Teaching English with Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Content and uptake of phosphorus and calcium with the yield of potato tubers depending on cultivation operations
Zawartosc oraz pobranie fosforu i wapnia z plonem bulw ziemniaka w zaleznosci od zabiegow agrotechnicznych
Autorzy:
Zarzecka, K
Gugala, M.
Powiązania:
https://bibliotekanauki.pl/articles/15906.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
phosphorus content
phosphorus uptake
calcium content
calcium uptake
yield
potato
tuber
cultivation operation
Opis:
In 2002-2004, a study was carried out, based on a field experiment set up on soil of very good rye complex. The experiment was designed as randomized sub-blocks with three replications. Two methods of soil tillage, conventional and simplified tillage, and seven weeding methods such as application of the following herbicides 1) control object – without herbicides, 2) Plateen 41,5 WG , 3) Plateen 41,5 WG + Fusilade Forte 150 EC, 4) Plateen 41,5 WG + Fusilade Forte 150 EC + adjuvant Atpolan 80 EC, 5) Barox 460 SL, 6) Barox 460 SL + Fusilade Forte 150 EC, 7) Barox 460 SL + Fusilade Forte 150 EC + adjuvant Atpolan 80 EC), constituted experimental factors. Phosphorus content in the tubers of cultivar Wiking potato was determined by colorimetry and calcium was tested by the atomic absorption spectrophotometry method (AAS). Phosphorus and calcium content and their uptake with tubers yield significantly depended on the tillage methods and weed control methods as well as weather conditions in the study years. Potato tubers from the simplified tillage cultivation had more phosphorus than tubers whose cultivation was based on the conventional tillage, in contrast to calcium, which was more abundant in tubers from the conventional method. The herbicides significantly reduced the phosphorus content and increased the calcium content compared with the control object. Phosphorus and calcium uptake by potato was significantly higher in the conventionally tilled treatments compared with the simplified method, and in the herbicide-treated plots compared with the mechanically cultivated control treatment.
W latach 2002-2004 przeprowadzono badania oparte na doświadczeniu polowym założonym na glebie kompleksu żytniego bardzo dobrego. Doświadczenie założono metodą losowanych podbloków w trzech powtórzeniach. Badanymi czynnikami były 2 sposoby uprawy roli – tradycyjna i uproszczona oraz 7 sposobów pielęgnacji z zastosowaniem herbicydów 1) obiekt kontrolny – bez herbicydów, 2) Plateen 41,5 WG , 3) Plateen 41,5 WG + Fusilade Forte 150 EC, 4) Plateen 41,5 WG + Fusilade Forte 150 EC + adiuwant Atpolan 80 EC, 5) Barox 460 SL, 6) Barox 460 SL + Fusilade Forte 150 EC, 7) Barox 460 SL + Fusilade Forte 150 EC + adiuwant Atpolan 80 EC). Zawartość fosforu w suchej masie bulw ziemniaka oznaczono kolorymetrycznie, a wapnia – metodą absorpcyjnej spektrofotometrii atomowej (ASA). Zawartość fosforu i wapnia i ich pobranie z plonem bulw zależały istotnie od sposobów pielęgnacji i warunków pogodowych w latach badań. Więcej fosforu zawierały bulwy ziemniaka z uprawy uproszczonej w porównaniu z tradycyjną, a więcej wapnia z uprawy tradycyjnej. Herbicydy zastosowane w pielęgnacji wpłynęły na obniżenie zawartości fosforu i podwyższenie zawartości wapnia w porównaniu z bulwami z obiektu kontrolnego. Pobranie fosforu i wapnia z plonem bulw ziemniaka było istotnie większe na obiektach z uprawą tradycyjną niż uproszczoną oraz na obiektach odchwaszczanych chemicznie w stosunku do obiektu kontrolnego pielęgnowanego wyłącznie mechanicznie.
Źródło:
Journal of Elementology; 2010, 15, 2; 385-392
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pistia Stratiotes Utilization to Improve the Straw Compost Quality
Autorzy:
Lestari, Mahayu Woro
Sholihah, Anis
Sugianto, Agus
Powiązania:
https://bibliotekanauki.pl/articles/2173358.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
N uptake
N cumulative
N uptake efficiency
N mineralization rate
compost mixture
Opis:
Pistia has no economic value. However, when mixed into straw compost, it tends to enhance its quality. Therefore, this study aims to determine how the Pistia mixture can improve the straw compost quality, thereby increasing rice production. The treatments consisted of soil (control) in values of P100, P75 + J25, P50 + J50, P25 + J75, J100, and NPK. The quality of compost observed was: N, P, K, C/N, lignin, polyphenols, cellulose, and organic matter content. N cumulative and N mineralization rate observed in the second stage was carried out at the incubation 1, 2, 4, and 8 weeks, N mineralization, N uptake, N absorption efficiency, growth, and yield as variables observed in the third stage. This research was conducted to determine the effect of adding a compost mixture with Pistia and straw towards the efficiency, growth, and production of upland rice plants. The results showed that the more Pistia mixed in the straw, the better the compost quality, growth, and yield above J100. N uptake was associated very strongly with the number of panicles and total dry weight of the plant.
Źródło:
Journal of Ecological Engineering; 2022, 23, 9; 78--87
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Patterns of uptake and repair following recasts and prompts in an EFL context: Does feedback explicitness play a role?
Autorzy:
Shirani, Reza
Powiązania:
https://bibliotekanauki.pl/articles/780651.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
corrective feedback
prompts
recasts
repair
uptake
Opis:
This study sought to examine the effectiveness of two categories of feedback, namely recasts and prompts. Also, the study focused on the relationship between subsets of each feedback type and the extent to which they led to learner uptake and repair in an EFL context. Data were collected through non-participant observations of three intact upper-intermediate EFL classes where 36 hours of interactions among 59 students and three teachers were audiotaped, transcribed, and analyzed in terms of pre-specified coding systems that addressed four different subtypes of prompts – clarification requests, repetitions, elicitations, and metalinguistic clues – and two recast subtypes – explicit and implicit recasts. Data analysis showed that among prompts, clarification requests led to the highest percentage of uptake whereas elicitations were associated with the highest repair percentage. As for recasts, more explicit ones led to higher percentages of uptake and repair. The results of the study may contribute to a more in-depth understanding of the patterns of uptake and repair in an EFL context. The study confirms the role of feedback explicitness in such a context.
Źródło:
Studies in Second Language Learning and Teaching; 2019, 9, 4; 607-631
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the total energy costs of resistance exercise: a work in progress
Autorzy:
Scott, Christopher B.
Reis, Victor M.
Powiązania:
https://bibliotekanauki.pl/articles/1054988.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
intermittent exercise
oxygen uptake
weight lifting
Opis:
We present an aerobic and anaerobic, exercise and recovery energy cost model of intermittent energy costs utilizing task (work, Joules) as opposed to rate (per minute) measurements. Low to moderate intensity steady state exercise energy costs are typically portrayed as the volumetric rate at which oxygen is consumed (VO2 L min–1), where a proportionate upward climbing linear relationship is profiled with an increasing power output; add to this the concept of the anaerobic threshold and energy costs increase with more intense aerobic exercise in disproportion to VO2 L min–1 measurements. As a per task function, intermittent work and recovery bouts contain a combined estimate of total costs, that is as kJ or kcal (not kJ.min-1 or kcal.min-1). Adopting this approach to describe single and multiple sets of resistance training, the model that emerges for intermittent resistance exercise portrays linearity between equivalent work and total energy costs that differs proportionately among conditions – “continuous” muscular endurance vs. Intermittent higher load strength work, moderately paced vs. slower and faster conditions, smaller vs. larger working muscle masses and failure (fatigue) vs. non-failure states. Moreover, per kcal (or kJ) of total energy costs, work (J) is more inefficient with a greater load and lower repetition number as opposed to lower resistance with an increased number of repetitions. The concept of energy costs Rusing disproportionately with increased or prolonged work does not appear to apply to resistance exercise.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2016, 14, 2; 5 - 12
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Content and uptake of selected trace elements by weeds in potato to cultivation under different conditions of soil tillage and weed control methods
Autorzy:
Zarzecka, K.
Gugała, M.
Baranowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/124723.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
weeds
trace elements
content
uptake
potato
Opis:
The study utilized data from a field experiment carried out at the Experimental Station in Zawady owned by the University of Natural Sciences and Humanities in Siedlce in the years 2005–2007. The experimental factors included two soil tillage systems and seven weed control methods in potato. Iron, copper and zinc in weeds were deter- mined with the AAS method. The trace element content in weed dry matter before row closure of potato depended significantly on soil tillage methods (excluding Cu), weed control methods and weather conditions, and, prior to tuber harvest, on soil tillage and weather conditions during the growing season. The uptake of Fe, Cu, and Zn by weeds from the area of 1 hectare depended on the experimental factors, weed biomass and weed chemical composition.
Źródło:
Journal of Ecological Engineering; 2014, 15, 4; 131-136
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of different tillage systems on the macronutrient content and uptake in sugar beets
Autorzy:
Gaj, R.
Budka, A.
Przybyl, J.
Powiązania:
https://bibliotekanauki.pl/articles/14411.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
plant cultivation
tillage system
macronutrient content
macronutrient uptake
sugar-beet
conservation tillage
nutrient content
nutrient uptake
Opis:
The study, carried out in 2012-2013, intended to determine effects of different cultivation systems on the uptake and content of macronutrients (nitrogen, phosphorus, potassium, magnesium, calcium and sodium) in sugar beets at the technological maturity stage. A conventional tillage system (SO) was compared to simplified technologies of soil cultivation. The following conservation tillage systems were analyzed: (2) tillage to a depth of 35 cm and sowing into stubble mulch (MS35); (3) shallow tillage to a depth of 15 cm and sowing into stubble mulch (MS15); (4) tillage to a depth of 15 cm and sowing into white mustard mulch; (5) strip-till on stubble mulch to a depth of 25 cm and instantaneous beet seed sowing (STS); (6) strip-till to a depth of 25 cm on white mustard mulch and instantaneous beet seed sowing (STG). Mineral nutrient concentrations in beets varied depending on the cultivation system applied and the plant organ analyzed. The experimental factor significantly differentiated the content of P, K, Ca, Mg and Na in both beet leaves and roots, having no effect on the nitrogen content. When compared to the conventional tillage system, a decreasing trend for phosphorus and calcium in beet leaves and a significant increase of sodium both in beet leaves and roots was observed in the simplified cultivation systems. Cultivation simplifications provided some equivocal evidence implicating differences in the nutrient content between the study years. The analysis of correlations between root yields and the total accumulation of nutrients indicated significant relationships for N, P, K, Ca, Mg only in the conventional tillage system and in the treatment with 35 cm deep tillage (soil ripping) along with sowing into stubble mulch (MS35). In the other treatments, strong relationships were observed only for individual nutrients.
Źródło:
Journal of Elementology; 2015, 20, 4
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of colloidal silver on vase life of cut chrysanthemum
Autorzy:
Byczyńska, Andżelika
Salachna, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1182604.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
SPAD
cut flower
postharvest
solution uptake
Opis:
In this study, the efficacy of colloidal silver in extending the vase life of cut chrysanthemum ‘Feeling Green’ inflorescences was evaluated. Three concentrations of colloidal silver were used: 0.01%, 0.02 % and 0.04%. Control inflorescences were kept in water. Colloidal silver treatments at all concentrations extended the vase life of cut chrysanthemum. The 0.02% colloidal silver treatment produced the longest vase life (25 days), while the control resulted in the shortest vase life (18 days). In addition, the less weight loss were observed in the inflorescences exposed to the solution of colloidal silver. The greatest solution uptake was observed in the variant with colloidal silver at 0.02%. Leaf greenness index was the highest in the chrysanthemums placed in 0.04% silver solution.
Źródło:
World Scientific News; 2017, 69; 239-243
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sulphur as a factor that affects nitrogen effectiveness in spring rapeseed agrotechnics. Part III. Agronomic use efficiency of nitrogen
Siarka jako czynnik kształtujący efektywność azotu w agrotechnice rzepaku jarego. Cz. III. Efektywność rolnicza i wykorzystanie azotu
Autorzy:
Barczak, Bożena
Skinder, Zbigniew
Piotrowski, Roman
Powiązania:
https://bibliotekanauki.pl/articles/2223285.pdf
Data publikacji:
2017
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:
Brassica napus L.
fertilization
nitrogen uptake
oilseed crops
sulphur uptake
nawożenie
pobranie azotu
pobranie siarki
rośliny oleiste
Opis:
Background. In view of the increased interest in rapeseed cultivation that has been observed in Poland in recent years, and due to an increasing shortage of sulphur in Polish soils, a study was undertaken on the effect of nitrogen and sulphur fertilization on the uptake of those elements in the seeds of the spring rapeseed cultivar Star and on the agricultural effectiveness and utilization of nitrogen from fertilizers. Material and methods. In a three-year-long study, experimental objects with different sulphur application methods (in-soil and foliar) and control with no nitrogen or sulphur fertilization were located on one field. Nitrogen fertilization at the doses of $0$, $60$, $120$, and $180 kg N·ha^(-1)$ was the first factor, and sulphur fertilization at the doses of $0$, $20$, and $60 kg S·ha^(-1)$ was the second factor. The experiment was set up on degraded Phaeozems with a low sulphur content. Results. In the conditions of joint nitrogen and sulphur fertilization, the nitrogen uptake in the seeds of spring rapeseed, as well as the agricultural effectiveness and the utilization of this element from the fertilizer were higher than without the sulphur application. In every growth season the combined use of nitrogen and $60 kg S·ha^(-1)$ usually made it possible to obtain the highest values of the studied parameters. Sulphur application method only to a low extent differentiated the uptake of the studied elements, agricultural effectiveness, and nitrogen utilization. Conclusion. Supplementing spring rapeseed nitrogen fertilization with an application of sulphur affected nitrogen uptake and its effectiveness and utilization from fertilizers, which may have positive economic and environmental consequences.
Podstawę badań stanowiło trzyletnie ścisłe doświadczenie polowe, realizowane na czarnej ziemi zdegradowanej, o odczynie obojętnym i niskiej zasobności w przyswajalną siarkę. Dwuczynnikowe doświadczenie założono w układzie równoważnych bloków. Czynnikiem I rzędu były dawki azotu (w $kg·ha^(-1)$: 0, 60, 120, 180), czynnikiem II rzędu – dawki siarki (w $kg·ha^(-1)$: 0, 20, 60). Dodatkowym aspektem badań było zróżnicowanie sposobów stosowania siarki (przedsiewnie – doglebowo oraz pogłównie – dolistnie). Uprawiano rzepak jary odmiany populacyjnej Star. Z przeprowadzonych badań wynika, ze warunki pogodowe w poszczególnych sezonach wegetacyjnych miały znaczący wpływ na pobranie azotu i siarki z plonem nasion rzepaku jarego, a także na efektywność rolniczą i wykorzystanie azotu z nawozów. W każdym sezonie wegetacyjnym wartości badanych parametrów były większe w warunkach łącznego nawożenia azotem i siarką niż bez siarki. Sposób aplikacji siarki wyraźnie różnicował tylko pobranie badanych pierwiastków z plonem nasion rzepaku jarego nawożonego wyłącznie tym składnikiem. Uzyskane wyniki wskazują, że suplementacja siarki poprzez wpływ na pobranie azotu oraz jego efektywność rolniczą i wykorzystanie z nawozów może mieć pozytywne skutki ekonomiczne i ekologiczne.
Źródło:
Acta Scientiarum Polonorum. Agricultura; 2017, 16, 4; 179-189
1644-0625
Pojawia się w:
Acta Scientiarum Polonorum. Agricultura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of sintering temperature of hydroxyapatite on biological and physicochemical properties of alginate/HA biomaterials for regenerative medicine applications
Autorzy:
Kazimierczak, P.
Syta, E.
Sochan, J.
Ginalska, G.
Przekora, A.
Powiązania:
https://bibliotekanauki.pl/articles/284206.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
ion reactivity
bone scaffolds
alginate
water uptake
Opis:
Synthetic hydroxyapatite (HA) has gained considerable attention in regenerative medicine over recent decades. It is widely used as a bone filler and constituent of various biomaterials. HA possesses high biocompatibility, osteoconductivity, bioactivity, and bioresorbability. There are many different synthesis methods for HA described in the available literature. It is worth noticing that even slight changes in pH, reaction conditions or chemical composition during synthesis, can influence biological, physicochemical, and mechanical properties of resultant HA. The aim of this study was to evaluate the impact of sintering temperature of hydroxyapatite on biological and physicochemical properties of biomaterial made of alginate and hydroxyapatite granules. Alginate/HA material was produced using HA sintered at temperature of 800oC and HA sintered at temperature of 1150oC. Microstructure of the fabricated biomaterials was visualized by SEM. Osteoblast growth on the composites was assessed using human foetal osteoblast cell line. Moreover, ion reactivity, plasma/serum protein adsorption ability as well as water/NaCl uptake capability of the biomaterials were compared. Obtained results demonstrated that although both biomaterials had the same chemical composition, composite comprising hydroxyapatite sintered at temperature of 1150oC had smoother surface, revealed lower ion reactivity, was more favourable to osteoblast growth, and adsorbed lower amount of fibrinogen (which is known to promote biomaterial-induced inflammatory response), compared to the material made of hydroxyapatite sintered at temperature of 800oC. Thus, the type of bioceramics used for the production of biomaterials should be tailored to their specific applications – bone fillers for primarily in vivo implantation or in vitro cell-seeded scaffolds.
Źródło:
Engineering of Biomaterials; 2018, 21, 145; 16-19
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of industrial wastes and municipal sewage sludge compost on the quality of virginia fanpetals (Sida Hermaphrodita Rusby) biomass Part 2. Heavy metals content, their uptake dynamics and bioaccumulation
Autorzy:
Krzywy-Gawrońska, E.
Powiązania:
https://bibliotekanauki.pl/articles/779153.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Virginia fanpetals
heavy metals
content
uptake
bioaccumulation
Opis:
A single-factor fi eld experiment was carried out at the Cultivar Evaluation Station in Szczecin-Dąbie in 2008-2010. In the experiment, the compost produced with municipal sewage sludge by the GWDA method and high-calcium brown coal ash (furnace waste) were used. The perennial energy crop was a test plant - Virginia fanpetals (Sida hermaphrodita Rusby). It results from the carried out study that Virginia fanpetals biomass contained on average the most manganese (24.7 mg?kg-1 d.m.), lead (2.50 mg?kg-1 d.m.) and zinc (50.5 mg?kg-1 d.m.) in 2008, while the most cadmium (0.33 mg?kg-1 d.m.), copper (3.78 mg?kg-1 d.m.) and nickel (2.57 mg?kg-1 d.m.) in 2010. Average cadmium, copper, manganese, nickel, lead and zinc contents in test plant biomass were higher, respectively by 14.3%, 10.0%, 7.3%, 19.3%, 29.1% and 6.9%, in the objects where municipal sewage sludge compost had been applied without and with addition of high-calcium brown coal ash when compared to those where only calcium carbonate or high-calcium brown coal ash had been introduced into the soil. The differences in cadmium, copper, manganese, nickel, lead and zinc contents in Virginia fanpetals biomass between particular experimental objects were not signifi cant. The least zinc was absorbed by the test plant biomass in the object with high-calcium brown coal ash being applied in the fi rst year of study and annually. When evaluating the dynamics of heavy metals uptake, it was found to be the lowest in the fi rst year of study (ranging from 4.40% to 11.0%). It increased in the second and the third year of study, oscillating between 29.9% and 65.7%. The degree of heavy metals accumulation in Virginia fanpetals biomass differed, depending on the fertilisation applied. The bioaccumulation factor of cadmium, copper and nickel after three study years was average, while that of manganese, lead and zinc was intense.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 3; 8-14
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of salinity stress on growth and macroelements uptake of four tree species
Autorzy:
Marosz, A
Nowak, J.S.
Powiązania:
https://bibliotekanauki.pl/articles/41524.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
tree species
salinity resistance
salinity stress
nutrient uptake
ornamental tree
growth
macroelement uptake
decorative value
road
street
Polska
Opis:
Woody plants grown near the roads are force-fed by salt and this has negative effect on their growth and decorative value. The aim of the presented study was to investigate the effects of salinity on growth and nutrient composition of four trees species often planted along the roads and streets in Poland. Two years old seedlings (bare root) of four tree species: Acer negundo, A. platanoides, Quercus robur and Tilia cordata were potted and grown outside under four soil salinity levels maintained by drenching plants with tap water containing 0.25, 0.5, 1.5, and 3.3g NaCl/L H2O. Plant height, soil samples for electrical conductivity (EC) and pH determination as well as leaf samples for macroelements (N, P, K, Ca, Mg) content evaluation were collected after each growing season of two years of experiment. Electrical conductivity of the growing medium varied insignificantly between species, but salt concentration in the growing medium was distinctly higher in the upper than in the bottom part. Soil salinity had strong but variable effect on plant growth during the experiment. Only Acer negundo growth was not affected even by the highest concentration of NaCl solution. With increasing salinity of growing medium more Na+ was taken by all species but the biggest amount of sodium ions was accumulated in the leaves of Tilia cordata, while the lowest in Acer negundo. Than potassium ions content decreased with increasing medium salinity only in the leaves of Quercus robur and Tilia cordata. In the leaves of Acer platanoides and Tilia cordata calcium concentration was decreased at increased salinity, in two other tested species amount of Ca2+ in the leaves was elevated. The main conclusion that can be drown is that Acer negundo is highly tolerant to salinity stress while Acer platanoides was the most sensitive among tested species.
Źródło:
Dendrobiology; 2008, 59; 23-29
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
“Three months on, I still sound like an Anglophone”: Tales of Success and Failure told by English and French Tandem Partners
Autorzy:
Scheuer, Sylwia
Horgues, Céline
Powiązania:
https://bibliotekanauki.pl/articles/22446730.pdf
Data publikacji:
2023
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
corrective feedback
tandem learning
uptake
phonetic developmen
Opis:
This paper reports on two ways in which success and failure can be operationalized and quantified in a non-institutional L2 learning context such as language tandem setting. We draw on the SITAF database, where we gathered 25 hours of video-recorded conversations held by 21 pairs, each consisting of a native speaker of English and a native speaker of French. The tandems performed collaborative tasks in both languages, thus giving each participant ample opportunity to be both the ‘expert’ and the ‘novice’ (learner) part of the dialogue. The tandem partners met regularly and autonomously outside of the recording sessions, and making progress in their L2 was one of their declared goals. Two possible measures of success in achieving this goal are: (1) the quality and quantity of learner uptake which followed the expert’s corrective feedback (CF) during the recorded conversations. Significant differences between the two L1 groups were observed: while 52% of the CF given by the native French speakers met with total uptake, over 52% of the English CF generated no uptake at all; (2) the participants’ own narratives of progress, as both the experts and the learners, obtained through questionnaires they filled out at the end of the program. Our study aims to contribute to the discussion on the stakes of successful L2 informal learning (with a focus on the acquisition of L2 pronunciation) by adopting a perspective which combines learners’ spoken output data and learners’ perceptions of their own language learning activity.
Źródło:
Theory and Practice of Second Language Acquisition; 2023, 9, 2; 1-28
2450-5455
2451-2125
Pojawia się w:
Theory and Practice of Second Language Acquisition
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A holistic review of heavy metals in water and soil in Ebonyi SE, Nigeria; with emphasis on its effects on human, plants and aquatic organisms
Autorzy:
Eyankware, Moses Oghenenyoreme
Obasi, Philip Njoku
Powiązania:
https://bibliotekanauki.pl/articles/1840786.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Heavy Metal
Water
Soil
Human
Uptake
Nigeria
Opis:
A comprehensive review of literature was carried out to evaluate the presence of heavy metals (HMs), with a view to study its effect on man, plants and aquatic organisms in Ebonyi State, southeastern Nigeria. From reviewed literature it was observed that the major source of HM in soil and water can be attributed to anthropogenic activities such as mining and quarrying. Geogenic activities were also implicated by some scholars. Detail analysis showed that 62 % of HMs in water and soil is attributed to mining, while 23 % is attributed to indiscriminate waste disposal, and 15 % is due of other human and geogenic activities. The accumulation of HMs in plants, soil and water poses a serious risk to human, plants and aquatic organisms within the study area. The occurrence of HMs in soil and water if not properly monitored may tend to increase in years to come and this may have negative impact on plants and aquatic organisms. Severe health effects of humans are inevitable. Therefore, constant re-evaluating of HM in water and soil in the area is highly required.
Źródło:
World News of Natural Sciences; 2021, 38; 1-19
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 131

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