Soil Phosphorus management based on changes in Olsen P and P budget under long- term fertilization experiment in fluvo-aquic soil
¹Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/ National Engineering Laboratory for Improving Quality of Arable Land, Beijing, 100081, P.R. China
²Agricultural Research Corporation (ARC), Wad Medani 126, Sudan
³The Center of Extending and Service of Agricultural Technique in China, Beijing 100026, China
Excessive input of phosphorus (P) in agricultural production and its finite resources is becoming a global concern for sustainable P management. In this study, the annual P input and output were calculated in 27 Fluvo-aquic soil sites of wheat and maize agriculture cropping system in Henan province central-east of China during the period from 1998 to 2016, to quantify soil Olsen P (OP) levels and P budget at the experimental sites and calculate the optimum P fertilizer application. The maize and wheat (Triticum aestivum) recorded 14.2 and 13.6 mg kg-1 respectively. The change in soil OP was positively linearly correlated with the P budget (P < 0.01), and an increase of 2.8 mg kg-1 in soil Olsen P for each 100 kg ha-1 of P budget in the 0–20 cm soil layer. Based on ACV of soil OP with P budget and the critical level of soil OP to ACV in the study area for the next five years, the recommended rate model of soil OP for maize and wheat in the study area was determined. The application amount of P fertilizer ought to be in the range of 64–85 kg P ha-1. This information can help to optimize crop yield, reduce the accumulation of P in soil, and reduce the potential risk of water pollution. More research is needed about the main factors influence on P available (OP).