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.
Highlights
Background +mineral fertilizer organic fertilizer organomineral fertilizer НІР05 0,04Not es: 1. Above the line - % to the ground, under the line - C fraction as a percentage of Сtotal. 2. 1 - the first fraction, 2 - the second fraction, 3 - the third fraction.There was a significant increase in the content of fulvic acids associated with the mineral part of the soil (FA3) for all fertilizer systems against the background of liming.Humines are the most stable compounds of soil organic matter, which over time are converted into more carbon-rich compounds
Initial agrochemical characteristics of 0-20 cm layer of sod-podzolic soil: pHKCL – 5.1; amount of exchange bases S – 2.6 mg-eq./100 g of soil; humus content according to Tyurin (DSTU 4289:2004) – 1.39%; mobile phosphorus according to Kirsanov (DSTU 4405:2005) – 3.9 and mobile potassium according to Maslova (DSTU 7907:2015) – 5.2 mg per 100 g of soil
During long-term agricultural use of sod-podzolic soil under grain-row 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
Summary
Background +mineral fertilizer organic fertilizer organomineral fertilizer НІР05 0,04Not es: 1. Above the line - % to the ground, under the line - C fraction as a percentage of Сtotal. 2. 1 - the first fraction, 2 - the second fraction, 3 - the third fraction.There was a significant increase in the content of fulvic acids associated with the mineral part of the soil (FA3) for all fertilizer systems against the background of liming.Humines are the most stable compounds of soil organic matter, which over time are converted into more carbon-rich compounds. Mineral fertilizer organic fertilizer organomineral fertilizer НІР05 0,04. There was a significant increase in the content of fulvic acids associated with the mineral part of the soil (FA3) for all fertilizer systems against the background of liming. Humines are the most stable compounds of soil organic matter, which over time are converted into more carbon-rich compounds. It is investigated that only with the organo-mineral fertilizer system conditions are created for the accumulation of soil-resistant compounds of soil organic matter. Liming of sod-podzolic soil leads to a significant decrease in the ratio of CH A / CFA from 0.93 (in control) to 0.41, changing the type of humus from humate-fulvate to very fulvate, which is a sign of a negative direction of the humification process (Table 2). 2. Influence of long-term fertilizer on the humus state of sod-podzolic soil
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