Influence of Liquid Fraction of Manure on Chernozem Properties and Yielding Capacity of Field Pea

The article presents the results of a laboratory experiment aimed at studying the effect of different doses of liquid fraction of livestock manure, obtained using an ST-1200 screw press separator, on the properties of leached chernozem and the yielding capacity of field pea. The experiment has included a control variant and variants with liquid fraction of manure (ZhFN) application rates of 50, 100, and 200 t/ha. It is found that the addition of liquid manure to the soil has significantly increased soil moisture by 1-3 % compared to the control variant and contributed to an increase in bulk density by 0,02-0,12 g/cm3 while maintaining a fluffy consistency. Reliable changes in the C-humus content by 0,2% abs. and by 0,02% N total are noted after adding 100 and 200 t/ha of liquid manure to the soil. Fertilizing the soil with the liquid fraction of manure has resulted in an increase of the nitrate nitrogen concentration in chernozem by 1.5-2 times (8 mg/kg). The addition of liquid manure to the soil has increased the availability of mobile phosphorus by 1.1 times and exchangeable potassium by 1,3-2,5 times. Maximum green mass productive capacity of peas in a laboratory experiment has been observed with the addition of 200 t/ha of liquid livestock manure. This experimental variant, compared to the control one, has showed a relative increase in plant length by 27,%, the number of internodes by 9,%, and phytomass reserves by 40,%.