The influence of different fertilization systems on the quantity and qualitative composition of humus of sod-podzolic soil

Abstract

Goal. To establish regularities of changes of fractional group composition of humus of sod-podzolic soil under the influence of different fertilizer systems in the conditions of Western Polissia. Methods. Field, laboratory analytical, calculation. Results. On the background of liming in the organic fertilizer system, there is a positive trend to increase humic acids in the arable layer of the soil. The organo-mineral fertilizer system creates conditions for the accumulation of resistant to destruction compounds of soil organic matter. The type of humus changes from very fulvate to fulvate. The organo-mineral fertilizer system creates the most favorable conditions for the accumulation of humus in the arable soil layer (the humus content increased by 28.6% as compared to the control). The degree of mobility of the entire system of humic substances changes in the direction of increasing the organo-mineral fertilizer system and decreasing the mineral and organic fertilizer systems as compared to the control and the background of liming. Conclusions. During long-term agricultural use of sod-podzolic soil at grain-plowing crop rotation under the organo-mineral fertilizer system against the background of liming, the humus content in the arable layer increased to 1.53%, the degree of humification of organic matter changed from very high to high. With the introduction of fresh organic matter in the form of manure under organic and organo-mineral fertilizer systems. The content of mobile humic substances increased and the formation of humic acids intensified. The application of only mineral fertilizers increased the content of fulvic acids in soil organic matter.