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., Ma, X. (2015). Validation of a soil phosphorus accumulation model in the wheat-maize rotation production areas of China, 178 42-48. http://dx.doi.org/10.1016/j.fcr.2015.03.007
© 2015 Elsevier B.V. A model for Olsen-P (extracted by 0.5molL<sup>-1</sup> NaHCO<inf>3</inf> 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 56.3-103kgPha<sup>-1</sup>, total wheat-maize yields between 12.3 and 13.1tha<sup>-1</sup> were obtained with net gains of 21.7-77.9kgPha<sup>-1</sup>yr<sup>-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 1.29mgkg<sup>-1</sup>yr<sup>-1</sup>, which was close to the measured mean value of 1.14mgkg<sup>-1</sup>y<sup>-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.
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