Soil Phosphorus Management Based on the Agronomic Critical Value of Olsen P |
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| Authors: | Qihua Wu Yi Ren Xiaoying Zhan Minggang Xu Gu Feng |
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| Institution: | 1. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land, Beijing, P. R. China;2. College of Resources and Environmental Sciences, China Agricultural University, Beijing, China;3. The Center of Extending and Service of Agricultural Technique in China, Beijing, China;4. College of Resources and Environmental Sciences, China Agricultural University, Beijing, China |
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| Abstract: | Fertilizer phosphorus (P) is generally added to agricultural soils to meet the needs of crop production. In this study, the crop yield and soil Olsen P were measured every year (5–18 years) at 16 winter wheat (Triticum aestivum L.) –maize (Zea mays L.) crop rotation sites in cinnamon soil (Luvisols in FAO system). The mean agronomic critical value of Olsen P for maize was 14.2 mg kg?1 and for winter wheat was 14.4 mg kg?1 when using the Liner-plateau and Mitscherlich models. The change in soil Olsen P was positively linearly correlated with the P budget (P < 0.01), and an increase of 4.70 mg kg?1 in soil Olsen P for each 100 kg ha?1 of P budget in the 0–20 cm soil layer. A model of P fertilizer recommendation rate that integrated values of the change in soil Olsen P in response to P budget and the agronomic critical value of Olsen P was used, in order to adjust current levels of soil Olsen P to the agronomic critical value at the experimental sites over the next 5 years, P fertilizer application rate should be in the range of 0–87.5 kg P ha?1. |
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| Keywords: | Agronomic critical value of Olsen P Change in Olsen P long-term fertilization P application rate |
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