The influence of long-term use of different fertilizer systems on the nutrient balance in a crop rotation and basic chemical properties of dark-grey forest soil (2nd rotation).

摘要

Data are presented on the balance of N, P, and K in the second of two 5-year crop rotations (1994-1998) in the Central NonChernozem zone of Russia. The effect of productivity, fertilizers and field content (% balance with yield) was: N -42-103, P -80-169 and K -26-49, for the whole period (1986-1998) 54-125, 89-173 and 26-49 respectively. Application of a full 13 year cropping system differentiated the normal balance as 210 (with N40P48K12 + 10 t manure) and 281 (with N74P74K23 + 10 t manure) kg dry wt. per year to 1 ha, with increases in soil humic substances of 0.1-0.3%, and mobile P from 2.0-3.3 mg/100 g soil; mobile K had a negative balance (26-49% removal).