The specificity of the nitrogen regime in gray forest and meadow-chernozemic soils under the effect of different genotypes of peas (Pisum sativum L.) was shown under field and optimal hydrothermal conditions. The dynamics of the nitrogen form ratios in soils with and without symbiotic nitrogen fixation was studied. The role of the macrosyrnbiont type genotype in the accumulation of ammonium, nitrate, and microbial nitrogen in soils was revealed.
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