EFFECT OF THE BIOLOGIZED FERTILIZER SYSTEMS ON BIOAVAILABLE HUMUS FORMS IN THE SOIL AND THE CONTENT OF C AND N IN THE UPPER LEAVES OF WINTER WHEAT
DOI:
https://doi.org/10.32636/agroscience.2025-(4)-2-3Keywords:
biologized fertilizers systems, winter wheat, labile and water-soluble forms of humus, C and N content in leavesAbstract
The article presents the results of experimental studies of the effects of biologized fertilizer systems on the level of bioavailable humus forms in the soil under winter wheat and the content of Carbon and Nitrogen in the upper leaves of winter wheat. The results of the studies showed, that an important conditions for improving the quality of the humus state of gray forestal soil under winter wheat are the use of biologized fertilizers systems. The advisability of combining the application of legume straw (peas or fodder beans) + N90P60K60 + biostimulator (BS), humus fertilizer (HF) was revealed; under these conditions, the level of labile humus in the soil was the highest (292–317 mg/100 g of soil). The content of water-soluble humus in the variants using mineral fertilizers at a dose of N90P60K60 during the heading phase varied insignificantly and was within 9.6–11.8 mg/100 g of soil. An increase in the content of water-soluble humus and a simultaneous decrease in the proportion of mobile organic matter were noted under the conditions of fertilizers containing legume straw + N150P120K120 + HF. Biologized fertilizers systems affected the distribution of Carbon and Nitrogen in the upper leaves of winter wheat. The content of total Carbon or Nitrogen in the specified plant organs during the flowering phase was in the ranges of 116.4–144.5 and 6.54–8.46 mg/g of raw matter, respectively. By the end of the growing season, the Nitrogen level decreased to 1.48–1.90 mg/g of raw matter, and Carbon – by about half. Changes in the level of the Carbon to Nitrogen ratio during the flowering – milky-wax ripeness phases, probably, indicate a higher intensity of the outflow of Nitrogen-containing assimilates, compared to Carbon-containing ones, from the upper leaves of winter wheat for forming the productivity of the winter wheat ear
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