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Wyszukujesz frazę "stem mass" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    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:
    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
      Wyświetlanie 1-3 z 3

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