The effect of nitrogen in nutritive solution on dry matter amount and accumulation of energy in wheat plants
2002
Hnilicka, F. | Hejnak, V. | Novak, V. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic). Agronomicka Fakulta)
In the laboratory conditions the trial on the effect of different nitrogen concentrations in nutritive solution Hoagland No. 3 as affected an energy accumulation and amount of dry matter of roots and above-ground biomass in young plants of winter wheat Samanta. The trial included the following variants: control variant - 1 N, variant with marked deficit of nitrogen -0.1 N, the variant with reduced nitrogen content - 0.5 N, the variant with increased nitrogen in solution - 2 N and 4 N. The weight of dry matter of roots and above-ground biomass (stems and leaves) of young plants of winter wheat was studied in selected stages of ontogeny. Amount of accumulated energy per 1 g of dry matter was finding calorimetrically in dry matter of different plant organs. The growth of amount of dry matter per one plant in all studied variants was apparent during ontogeny. The lowest weight of roots (1.112 g in averadge), but the highest weight of dry matter of above-ground biomass (3.810 g was an average)can be found in the variant 2 N, and thus also total amount of dry matter per one wheat plant. This result led to the broadest ratio of above-ground biomass to roots in the variant 2 N. On the other hand, unbalanced level of nutrients, i.e. above all deep deficit (variant 0.1 N) or abundance of nitrogen (variants 2 N and 4 N), leads to limitation of production of energy-rich substances and their subsequent accumulation into different plant organs and hence there is a possibility of the use of calorimetry as a method to detect tolerance of plants against unfavourable conditions of environment.
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