ORGANIC FERTILIZERS INFLUENCE ON THE HUMUS STATE OF SOD-PODZOLIC SANDY LOAM SOIL

Abstract

Under the effect of various types of anthropogenic load, the number of external positive and negative factors affecting the formation and functioning of humus system of soils is increasing. So it is necessary to find indicators of humus state of soils reflecting their genetic and agronomic features. The action of different types of organic fertilizers on the humus condition of sod-podzolic sandy loam soil in field experiment is evaluated according to the results of analysis of soil samples taken a year after fertilizer application. The most positive influence on qualitative humus composition had litter manure and compost based on peat, lignin, pulp, defecate, straw and semi-liquid manure. The humification degree of organic matter increased from 26.3 to 32.5–34.6 % with the relations expansion СHA/СFA from 0.82 to 0.92–0.99. The indicator of intensity of the humification process on the stage of the tumor humic acids СHA-1/СFA-1 increased from 0.79 to 0.94–1.08, at the stage of polymerization and the complexity of humic structures (СHA-2/СFA-2) – from 0.71 to 0.81–0.83, indicating the gain characteristic of humate of humus. Humus degradation changes evidence had found in the variants of vermicompost, liquid cattle manure and effluent input. HA-2 equity participation in the humic acids total amount declined to 9–14 % with the СHA-2/СFA-2 decrease rate to 0.24–0.58.