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Wyszukujesz frazę "stem mass" wg kryterium: Wszystkie pola


Wyświetlanie 1-7 z 7
Tytuł:
Issledovanie processa zakhvata steblevykh materialov vilchatym mekhanizmom
Research of process of capture of stem materials by forked mechanism
Autorzy:
Dubrovin, V.
Yeremenko, A.
Vigovskiy, S.
Powiązania:
https://bibliotekanauki.pl/articles/76398.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
stem mass
aggregate
phenomenon
analytical model
theoretical research
technological process
Opis:
Изложен методологический подход к раскрытию физической сути явлений, которые возникают на рабочих органах вильчатого захвата, разработана графоаналитическая модель стеблевых материалов для проведения теоретических исследований технологических процессов. Полученные результаты могут быть использованы при проектировании технических средств для выполнения погрузочных работ со стеблевой массой.
The methodological going is expounded near opening of physical essence of phenomena which arise up on workings organs of capture, the graphic analytical model of stem materials is developed for conducting of theoretical researches of technological processes. Can be drawn on got results at planning of hardwares for implementation of loadings works with stem mass.
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 3
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dokładność określania świeżej masy strzał jodły na podstawie przeliczników wagowo-objętościowych
Accuracy of estimation silver fir stem mass on the basis of volume to weight conversion factors
Autorzy:
Ochal, W.
Wertz, B.
Grabczyński, S.
Orzeł, S.
Powiązania:
https://bibliotekanauki.pl/articles/985798.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewa lesne
jodla pospolita
Abies alba
biomasa drzewna
masa strzaly drzew
biomasa swieza
szacowanie biomasy
wspolczynniki wagowo-objetosciowe
gestosc drewna
abies alba
wood density
stem biomass
biomass estimation
Opis:
The paper describes the accuracy of estimation of silver fir stem fresh mass on the basis of volume to weight conversion factor, derived from samples, collected from few different places along the stem. The research material contained 13 sample trees selected from homogenous 70−years old stand, situated in mountainous area of the Beskid Sądecki in Polish part of the Carpathians (S Poland). Volume over the bark of sample trees was calculated with section−wise method and the whole stem fresh biomass was directly weighted. For each sample tree three stem discs were collected at 1/6, 1/2 and 5/6 of tree height, their weight and volume were precisely determined and the biomass conversion factors (equivalent of stem density) were calculated. The assessment of the accuracy of whole fresh stem biomass was conducted according to five variants: for the biomass conversion factors derived from each individual stem disc (lower, middle or upper), from weighted mean density and on the basis of the constructed mixed model, where relative height and diameter were treated as fixed effects and influence of individual trees was included as a random term. The volume of sample fir stems ranged from 0.15 to 2.22 m3, while their fresh biomass varied between 138.1 and 1896.7 kg. Obtained results show that variation of the density was higher within stems than between them (coefficient of variation amounted to 8.4% i 3.3% respectively). The average density increased along stem, from 835.6 kg/m3 for lower part (1/6H) to 986.8 kg/m3 for the upper part (5/6H). Estimating the biomass on the basis of just lower stem disc resulted in the average relative error equal to –5.8%, while for middle stem disc the error was +1.2%, and for upper disc +11.3%. The use of conversion factors derived from weighted average density of all three stem discs resulted in average bias equal to –1,7% with standard error 1,0%. Despite the presence of mean bias of –2.3%, the constructed density model gave the most precise estimation of the stem biomass (standard error 0.7%), which indicates the reasons for its further improvements and usage.
Źródło:
Sylwan; 2018, 162, 04; 277-287
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of variable magnetic field stimulation on growth of aboveground parts of potato plants
Autorzy:
Marks, N.
Szecowka, P.S.
Powiązania:
https://bibliotekanauki.pl/articles/24275.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
potato plant
potato tuber
field stimulation
magnetic field
magnetic induction
exposure dose
growth
stem mass
leaf mass
aboveground part
Źródło:
International Agrophysics; 2010, 24, 2; 165-170
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphological Effects of Stymjod Foliar Application on Medicago × varia T. Martyn
Autorzy:
Sosnowski, Jacek
Toczyska, Ewelina
Truba, Milena
Powiązania:
https://bibliotekanauki.pl/articles/123375.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
iodine
alfalfa
plant morphology
stem
leaves
mass of plants
Opis:
The aim of the study was to investigate how the foliar application of iodine, as well as its concentration in the working liquid, influence the growth of fresh and dry weight of plants, stems, leaves, roots and number of shoots and leaf laminae of sand Lucerne. The experiment was carried out in vases. The three plants that developed the largest number of leaves in the vase were left. The experimental factors as the plant growth regulator with the trade name Stymjod in three concentrations of 1.5%, 3% and 4.5% in the working liquid were introduced; the control involved distilled water. Two plant applications were performed. The first one in 6 appropriate leaf phase and the second in the branching formation phase. A single dose of the working liquid was 50 ml per vase. This dose of liquid caused the complete sprinkling of plants in a vase. The obtained results were statistically analyzed by means of analysis of variance. The experiment showed that the concentration of Stymjod in the working liquid is very important. It is difficult to say which concentrations gave the best results in cultivating sand lucerne. The present studies demonstrated that Stymjod applied foliarly at 4.5% concentration significantly affected the growth of stems and leaf blades. Additionally, 1.5% concentration increased the weight of fresh matter and dry matter of roots. The experiment showed that the effects of Stymjod application to hybrid alfalfa depended on its dose. It is difficult, however, to clearly state which concentration produced the best results so further research in this area is needed.
Źródło:
Journal of Ecological Engineering; 2019, 20, 8; 184-191
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulating the partitioning of winter rape biomass by increasing the cutting height of stems
Autorzy:
Zając, T.
Oleksy, A.
Synowiec, A.
Dacko, M.
Klimek-Kopyra, A.
Ratajczak, K.
Kulig, B.
Powiązania:
https://bibliotekanauki.pl/articles/2082513.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
agricultural harvest index
harvest index
stem
diameter
stubble mass
yield
Opis:
In three seasons 2010-2013, field experiments with two hybrid cultivars of winter oilseed rape were conducted in three localities in Southern Poland, with the aim of assessing changes in the harvest index, as compared to the agricultural harvest index of winter oilseed rape, defined as the harvest index decreased by the stubble height in relation to three plant categories (small, medium and large). As a result, an increase in the height of the stubble of winter oilseed rape in the range of 0-60 cm led to an increase in the agricultural harvest index value by about 0.081 for cv. ‘Adam’, and by 0.078 for cv. ‘Poznaniak’. The agricultural harvest index values were changed mostly by the vegetative seasons (p < 0.001). An increase in the height of the stubble of winter oilseed rape by 10 cm increased the agricultural harvest index of small, medium and large plants by about 0.091, 0.075 and 0.073, respectively, as compared to the harvest index values. The linear correlation between the height of the stubble of the winter oilseed rape plants and their agricultural harvest index was significant (R2 = 0.97-0.99). Depending on the factor (cultivar, locality, vegetative season or plant category), an increase in the height of the stubble of winter oilseed rape by 10 cm contributed to an improvement in agricultural harvest index from 0.012 to 0.015 g g-1.
Źródło:
International Agrophysics; 2019, 33, 2; 241-253
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wlasciwosci agrofizyczne amarantusa [Amaranthus cruentus L.]
Agrophysical properties of amaranth ( Amaranthus cruentus L.)
Autorzy:
Szot, B
Powiązania:
https://bibliotekanauki.pl/articles/1630379.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
uprawa roslin
Amaranthaceae
Amaranthus
szarlat
nasiona
zbior
plony
wlasciwosci agrofizyczne
wlasciwosci fizyczne
cechy aerodynamiczne
wlasciwosci reologiczne
cechy geometryczne
cechy biometryczne
grubosc lodyg
wysokosc roslin
masa wiechy
wysokosc wiechy
szerokosc wiechy
chropowatosc
cechy jakosciowe
sklad chemiczny
plant cultivation
amaranth
seed
harvest
yield
agrophysical property
physical property
aerodynamic property
rheological property
geometrical feature
biometric feature
stem thickness
plant height
panicle mass
panicle height
panicle width
roughness
qualitative trait
chemical composition
Opis:
Biometrical features of plants and physical properties of amaranth seeds (Amaranihus cruentus) of a population variety originating from South America and a new Polish variety Rawa have been studied. New research methods were worked out or old methods were adapted to suit specific features of this plant. Studies were carried out in the period 1995-96 (population variety) and in 1997 (variety Rawa). Alongside field experiments plot experiments with varying sowing density were conducted in order to evaluate the influence of the number of plants per 1 mL plant on the variability of biometrical features and yields. Plant and wisp height, stalk thickness, wisp mass, number of plants per 1 mL and biological yield as well as seed self-shedding were determined. Geometrical properties (thickness, width, and length) were determined for individual seeds together with their aerodynamic features, surface roughness, resistance to static loading and microstructure. Whereas seed mass was characterised by such parameters as: density, porosity, outer and inner friction, angle of repose and chute, rehological properties and qualitative features. It has been found out that Rawa variety was more uniform than population variety and gave yields that were 50% higher. Seed sowing density differentiated plant biometrical features. Seed self-shedding in different weather conditions ranged from 0,3 to 2.1% of the biological yield. Physical properties of seeds changed according to moisture levels which was described by the regression lines and curves. It was found that with moisture decrease seed thickness, and the mean values ranged from 0,58 to 0,93 mm. Seeds of Rawa variety were developed better. The weight of 1000 seeds was from 0,60 g (very dry seeds) to 0,95 g (very moist seeds). Density was increasing with the decrease in moisture from 653,3 to 842,0 kg/m3. Whereas, porosity of the seed mass decreased from 53,5 to 40,0 %. Both the angle of repose and chute were decreasing with the decrease in the coefficient of inner and outer friction while the roughness of the seed surface was increasing. Amaranth seeds appeared to be more resistant to mechanical loading. The force ranging from 10.7N (very moist seeds) to 70,6N (dry seeds) was sufficient to damage the structure of an individual seed. Aerodynamic seed features depended on such parameters as seed load bearing surface, width, length and weight. With the increase in these parameters critical velocity increased linearly, and the coefficient of volatility decreased according to the same formula.A generalised Maxwell model with three branches was used to describe the phenomena of stress relaxation in the seed mass. It led to the conclusion that amaranth seeds en mass show strong viscoelastic properties. Seed qualitative features show high nutritive value, and evaluation of their microstructure showed that they contain unique starch with kernels thet are very uniform in size (1-1,5(m). Learning about biometrical plant features and their physical properties allowed for working out agrophysical basic for the harvest technology of this plant.
Źródło:
Acta Agrophysica; 1999, 18; 1-73
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wartość rolnicza europejskich odmian życicy trwałej (Lolium perenne L.) w warunkach Polski
Agronomic value of European cultivars of perennial ryegrass (Lolium perenne L.) in the Polish conditions
Autorzy:
Czembor, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/41326960.pdf
Data publikacji:
2007
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
pleśń śniegowa
plon zielonej masy
rdza źdźbłowa
rdza koronowa
regeneracja po zimie
użytkowanie kośno-polowe
użytkowanie nasienne
wartość rolnicza
życica trwała
agronomic value
crown rust
field-cutting management
green mass production
perennial ryegrass
regeneration after winter
seed production management
snow mould
stem rust
Opis:
Badania prowadzono w latach 2004–2006. Łącznie scharakteryzowano 33 odmiany życicy trwałej włączone do programu „EUCARPIA multisite rust evaluation”, w tym 19 odmian diploidalnych i 14 tetraploidalnych. Opisano cechy morfologiczne i fizjologiczne roślin w stadium wegetatywnym i generatywnym, mające istotny wpływ na ich wartość rolniczą w użytkowaniu kośno-polowym i nasiennym, ze szczególnym uwzględnieniem odporności na rdzę koronową i pleśń śniegową. Badany materiał wykazał zróżnicowanie pod względem: odporności na rdzę koronową i źdźbłową ocenioną przed zbiorem 2 pokosu w sierpniu, odporności na rdzę koronową ocenioną przed zbiorem 3 pokosu we wrześniu w 2004 roku i odporności na pleśń śniegową w 2005 i 2006 roku oraz pod względem cech charakteryzujących morfologię i fizjologię roślin w okresie późnej jesieni i wczesnej wiosny (stan roślin przed zima i zdolność do szybkiej regeneracji w okresie wczesnowiosennym). Dodatkowo, w stadium wegetatywnym opisano szerokość górnego, w pełni wykształconego liścia, wyso¬kość roślin i szacunkowy plon zielonej masy. W stadium generatywnym badane odmiany różniły się między sobą pod względem wczesności, wysokości, morfologii kłosa i liścia flagowego. Analiza czynnikowa z rotacją Varimax za pomocą kryterium Kaisera pozwoliła dokonać podziału 25 zmiennych istotnie różnicujących odmiany życicy trwałej (obserwowanych cech) na 8 czynników głównych i określić, które zmienne wchodzą w skład określonego czynnika i są istotnie zależne od siebie. Uzyskane wyniki wykazały istotny, ujemny wpływ rdzy źdźbłowej i koronowej na szacunkowy plon zielonej masy w 2 i 3 pokosie. Wykazano również istotne, dodatnie współzależności pomiędzy stanem roślin przed zimą, odporność na pleśń śniegową i stanem roślin po zimie oraz istotny wpływ tych cech na wartość rolniczą badanych odmian w stadium generatywnym. Odmiany diploidalne wykazywały niższą odporność na pleśń śniegową, wolniej regenerowały się po zimie oraz wykazywały niższą wartość rolniczą w użytkowaniu nasiennym w stosunku do odmian tetraploidalnych. Na szczególna uwagę zasługują trzy odmiany tetraploidalne: Lacerta, Aubisque i Pastoral, które wykazały podwyższoną wartość rolniczą w użytkowaniu kośno-polowym i nasiennym.
Investigations were performed in the years 2004–2006 on thirty tree perennial ryegrass cultivars included into the “EUCARPIA multisite rust evaluation” (19 diploid and 14 tetraploid). Morphological and physiological character connected with agronomic value of the cultivars, with special emphasis on crown rust, stem rust and snow mould resistance, were described. It was possible to observe differences in the stem rust and crown rust resistance scored before 2nd cut, crown rust resistance before 3rd cut in 2004, snow mould resistance in 2005 and 2006 and in the morphology and physiology during fall and early spring (plant performance before winter, performance after winter and ability to rapid regrowth after winter). Additionally, in the vegetative stage, leaf width, plant height and estimated green mass production were described. In the generative stage differences were observed in the time of maturity, morphology of spike and flag leaf and in plant height. Using the factor analysis method, it was possible to divide 25 variables, which showed significant differences between the tested cultivars, into 8 principal components and to determine relationships between them. The obtained results showed negative influence of the stem rust and crown rust on estimated green mass production in the 2 and the 3 cut. It was possible to find positive correlations between fall performance of tested plants, their snow mould resistance, regeneration after winter and significant influence of those characters on the agronomic value of the tested cultivars in the generative stage. Snow mould resistance, regeneration after winter and agronomic value in the generative stage of the diploid cultivars was lower than in the group of tetraploid cultivars. Three tetraploid cultivars are especially promising Lacerta, Aubisque and Pastoral, which showed high agronomic value in field-cutting and seed production management.
Źródło:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2007, 245; 223-247
0373-7837
2657-8913
Pojawia się w:
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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