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Wyszukujesz frazę "Physicochemical properties" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Relationship between assimilable-nutrient content and physicochemical properties of topsoil
    Autorzy:
    Tkaczyk, Przemysław
    Bednarek, Wiesław
    Dresler, Sławomir
    Krzyszczak, Jaromir
    Baranowski, Piotr
    Sławiński, Cezary
    Powiązania:
    https://bibliotekanauki.pl/articles/972810.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    soil nutrients
    soil reaction
    macroelements
    microelements
    topsoil
    Opis:
    In the years 2008-2011, an environmental study was conducted for Polish soils, focusing on the south-eastern Poland soils, as they exhibit significant acidification. This study aimed at assessing the current pHKCl and the supply of basic macro- (P, K, Mg and S-SO4) and microelements (B, Cu, Fe, Mn and Zn) in the collected soil samples, and also at determining their relationship with the soil agronomic category, humus content and pH class. Soil reaction and humus and macronutrient content were positively correlated with the amount of colloidal clay and particles < 0.02 mm. In the majority of cases, the macro-element content in the soil was positively correlated with soil pH and humus content. As for microelements, a usually significant and positive correlation was found between the soil agronomic category and the content of manganese, iron and zinc, whereas for the content of boron and copper, no such relationship was observed. A significant and positive correlation between soil reaction and the content of manganese, iron and boron was also found. Such correlations were not observed in relation to copper and zinc content. Statistical analysis indicated that the content of boron and manganese depended to the greatest extent on the investigated physicochemical properties.
    Źródło:
    International Agrophysics; 2017, 31, 4; 551-562
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physicochemical properties of extrudates from white yam and bambara nut blends
    Autorzy:
    Oluwole, O.B.
    Olapade, A.A.
    Awonorin, S.O.
    Henshaw, F.O.
    Powiązania:
    https://bibliotekanauki.pl/articles/25774.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    This study was conducted to investigate effects of extrusion conditions on physicochemical properties of blend of yam and bambara nut flours. A blend of white yam grit (750 jim) and Bambara nut flour (500 (tm) in a ratio of 4:1, respectively was extrusion cooked at varying screw speeds 50-70 r.p.m., feed moisture 12.5-17.5% (dry basis) and barrel temperatures 130-150°C. The extrusion variables employed included barrel temperature, screw speed, and feed moisture content, while the physicochemical properties of the extrudates investigated were the expansion ratio, bulk density, and trypsin inhibition activity. The results revealed that all the extrusion variables had significant effects (p<0.05) on the product properties considered in this study. The expansion ratio values ranged 1.55-2.06, bulk density values ranged 0.76- 0.94 g cm"3, while trypsin inhibition activities were 1.01-8.08 mg 100 g"1 sample.
    Źródło:
    International Agrophysics; 2013, 27, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of the physicochemical properties of pellets on the germination of pelleted sugar beet seeds
    Autorzy:
    Podlaski, S.Z.
    Wzorek, H.
    Chomontowski, C.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082498.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    swelling ability
    total porosity
    water potential
    water content
    Opis:
    The effects of the physicochemical characteristics of pellets, when applied to sugar beet seeds originating from ten seed companies, on the germination of pelleted seeds were assessed. The most significant factor was the force necessary to break the pellet, which was found to positively correlate with pellet’s abrasion resistance, and negatively with pellet’s water resistance. Pellets dissolved in water, characterized by low water resistance, negatively affected germination under the conditions of excess water in the filter paper. A low water potential of pellets inhibited seed germination, particularly with the shortfall of water in the germination medium. The water flow between the pellet and the pericarp was of much importance for germination. Under the conditions of the shortfall and excess of water in the germination medium, the physicochemical properties pellets had a greater effect on the drawing of water, and on the water flow between the pellet and the seeds, than under the optimum moisture conditions. Organic pellets were characterized by a greater ability to absorb water than mineral or organic-mineral pellets. The pellets varied in their chemical composition, with the greatest variation (over ninety-fold) relating to pellet’s copper content. The following values exhibited low variety: Zn, Mn, and Pb. It can be concluded that pellet’s cracking force and water resistance are the basic parameters of pellet quality, and the swelling ability of pellets is determined by their organic or monaural composition.
    Źródło:
    International Agrophysics; 2019, 33, 2; 175-183
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical relationship between selected physicochemical properties of peaty-muck soils and their fraction of humic acids
    Autorzy:
    Boguta, P.
    Sokolowska, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/26272.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    statistical relationship
    physicochemical property
    soil
    peat-muck soil
    soil fraction
    humic acid
    organic soil
    humification
    Opis:
    Influence of humic acids on soil environment is still subject of scientific discussions. The aim of above studies was to investigate the relationships between selected physicochemical properties of eleven peaty-muck soils and properties of humic acids isolated from these soils. The following parameters were determined for soils: total and organic carbon, density, ash, humifi- cation, and the water absorption index. Humic acids were described by: absorbance at 280 nm, absorbance ratios at 465 and 665 nm, at 260 and 665 nm, elemental composition and atomic ratios: H/C, O/H, O/C, C/N, the degree of internal oxidation, and the content of carboxylic and phenolic groups. Statistical analyses showed that an increase in density, humification, and water absorption indices of soils caused a significant increase in the humic acid parameters: absorbance at 280 nm, the oxygen content, O/H, O/C ratios, inter- nal oxidation degree, and functional groups. Statistically signifi- cant negative correlations were found for the same parameters of soils and for the hydrogen and carbon content as well as the H/C ratio of humic acids. The relationships showed that there was a pos- sibility to express the properties of humic acids on the basis of more simple parameters measured for soil and without time-consuming isolation of humic acids.
    Źródło:
    International Agrophysics; 2014, 28, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of the process kinetics and analysis of physicochemical properties in the freeze drying of kale
    Autorzy:
    Dziki, Dariusz
    Polak, Renata
    Rudy, Stanisław
    Krzykowski, Andrzej
    Gawlik-Dziki, Urszula
    Różyło, Renata
    Miś, Antoni
    Combrzyński, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/972569.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    Investigations were performed to study the freeze-drying process of kale (Brassica oleracea L. var acephala). The process of freeze-drying was performed at temperatures of 20, 40, and 60°C for whole pieces of leaves and for pulped leaves. The kinetics of the freeze-drying of both kale leaves and kale pulp were best described by the Page model. The increasing freeze-drying temperature from 20 to 60°C induced an approximately two-fold decrease in the drying time. Freeze-drying significantly increased the value of the lightness, delta Chroma, and browning index of kale, and had little influence on the hue angle. The highest increase in the lightness and delta Chroma was observed for whole leaves freeze-dried at 20°C. An increase in the drying temperature brought about a slight decrease in the lightness, delta Chroma and the total colour difference. Pulping decreased the lightness and hue angle, and increased browning index. Freeze-drying engendered a slight decrease in the total phenolics content and antioxidant activity, in comparison to fresh leaves. The temperature of the process and pulping had little influence on the total phenolics content and antioxidant activity of dried kale, but significantly decreased the contents of chlorophyll a and chlorophyll b.
    Źródło:
    International Agrophysics; 2018, 32, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of tannery wastes and biochar on soil chemical and physicochemical properties and growth traits of radish
    Autorzy:
    Nabavinia, F.
    Emami, H.
    Astaraee, A.
    Lakzian, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/25565.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Źródło:
    International Agrophysics; 2015, 29, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the physicochemical properties of post-manufacturing waste derived from production of methyl esters from rapeseed oil
    Autorzy:
    Matwijczuk, Arkadiusz
    Kachel-Jakubowska, Magdalena
    Gagoś, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/973132.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    technical glycerine
    distilled glycerine
    fatty acids
    mong
    atr-ftir
    calorific value
    biodiesel
    waste
    cooking oil
    Opis:
    The technology of transesterification of biodiesel obtained from many agricultural products, which are often referred to as renewable resources, yields substantial amounts of by products. They exhibit various properties that prompt scientific research into potential application thereof. Various spectroscopic methods, e.g. Fourier transform infrared spectroscopy, are being increasingly used in the research. In this paper, we present the results of Fourier transform infrared spectroscopy spectroscopy analyses of technical glycerine, distilled glycerine, and matter organic non glycerol, i.e. by-products of biodiesel production. To facilitate the spectroscopic analysis, a number of parameters were determined for all the materials, e.g. the calorific value, water content, sulphated ash content, methanol content, acidity, as well as the contents of esters, heavy metals, aldehydes, nitrogen, and phosphorus. The results indicate that the analysed products are characterised by a comparable calorific value in the range from 11.35 to 16.05 MJ kg-1 in the case of matter organic non glycerol and technical glycerine. Observation of changes in the position of selected peaks in the range of 3700-650 cm-1 in the Fourier transform infrared spectroscopy method facilitates determination of the level of degradation of the analysed material. Changes in the wavelength ranges can be used for monitoring the formation of secondary oxidation products containing carbonyl groups.
    Źródło:
    International Agrophysics; 2017, 31, 2; 175-182
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Pb-stress on selected physicochemical surface properties of barley [Hordeum vulgare L.] roots
    Autorzy:
    Szatanik-Kloc, A.
    Hrebelna, N.
    Sokolowska, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/25483.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Źródło:
    International Agrophysics; 2007, 21, 4; 399-403
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the sorption properties of different soils using water vapour adsorption and potentiometric titration methods
    Autorzy:
    Skic, K.
    Boguta, P.
    Sokolowska, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/25797.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    sorption property
    soil
    water vapour adsorption
    potentiometric titration
    cation exchange capacity
    surface area
    physicochemical characteristics
    Źródło:
    International Agrophysics; 2016, 30, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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