The effect of long-term fertilizer application on the phosphorus and potassium balance in drained sod-podzolic soil
2003
Lipenite, I. | Stikans, J. (Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Dept. of Soil Science and Agrochemistry)
The effect of annual long-term application of different fertilizer rates on the phosphorus and potassium balance in drained unlimed and limed soil has been investigated. Balance input and output elements were calculated from the field trial data obtained during 1982-1999. It was estimated that application of fertilizer rates less than P30 and K45 had led to the deficit of these nutrients in soil. A positive balance of potassium (15-47 kg ha*[-1) yr*[-1)) and phosphorus (20-47.8 kg ha*[-1) yr*[-1)) was obtained using fertilizer rates P60K90 and P90K135. However, such surplus formed due to annual return of nutrients in the crop's by-product. Sufficient increase in available phosphorus content in soil was observed using P90, though the increase in available potassium content was found even using fertilizer rate K45.
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