Validation of a soil phosphorus accumulation model in the wheat-maize rotation production areas of China.

Wang, B., Li, J., Ren, Y., Xin, J., Hao, X., Ma, Y., and Ma, X. (2015). "Validation of a soil phosphorus accumulation model in the wheat-maize rotation production areas of China.", Field Crops Research, 178, pp. 42-48. doi : 10.1016/j.fcr.2015.03.007  Access to full text

Abstract

A model for Olsen-P (extracted by 0.5 mol L-1/sup} NaHCO3/sub} at pH 8.5) accumulation in soils, established using several experimental field sites, has not been validated by a large scale dataset. In the present study, a long-term (maximally 24 years), large-scale, regional soil monitoring dataset consisting of 58 sites from four provinces (Hebei, Henan, Shandong and Shanxi) of the main wheat (Triticum aestivum L.)–maize (Zea mays L.) rotation production areas in China was used to validate the developed model for Olsen-P accumulation in soils for both inorganic and organic P fertilization. The results showed that with fertilizer P application rates of 56.3–103 kg P ha-1/sup}, total wheat–maize yields between 12.3 and 13.1 t ha-1/sup} were obtained with net gains of 21.7–77.9 kg P ha-1/sup} yr-1/sup}in the soils in these areas. The accumulation of Olsen-P in the P-fertilized soils above the initial soil Olsen-P contents could be predicted by fertilizer P application rates (including organic and inorganic P sources), crop yields and soil pH. According to the model, the mean accumulation rate of Olsen-P in the main wheat–maize rotation areas of China was 1.29 mg kg-1/sup} yr-1/sup}, which was close to the measured mean value of 1.14 mg kg-1/sup} yr-1/sup}. The soil Olsen-P accumulation model could provide a valuable predictive tool, decreasing the frequency of Olsen-P monitoring in soils and improving soil phosphorus management for both agricultural production and environmental protection. Keywords: Accumulation; Model validation; Olsen-P; Wheat–maize rotation

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