Influence of different regimes of humidification upon humus state of alluvial-meadow soils

Abstract

The purpose. To determine changes of quantitative and quality indicators of humus of alluvial-meadow heavy clayloam soil at different regimes of its humidification. Methods. Theoretical justification, laboratory-model experiments, chemical analysis and statistical. Results. It is determined that regime of humidification for the term of composting (9 months) has not influenced the general content of humus. At the same time its group and fractional composition has essential varied. At optimum and contrasting humidification ratio Sgk:Sfk was augmented primarily due to accumulation of humates, and at overwetting, on the contrary, has converged due to fulvatization of humus. Conclusions. Optimum conditions of humidification promoted fixation of humus matters in the form of humates of calcium, and contrasting — to fixation of humus matters by finely dispersed mineral part. Fixed overwetting of soil has led to fulvatization of humus due to accumulation fulvate group.