等有机质 |
Relationship Between Soil Available Phosphorus and Inorganic Phosphorus Forms Under Equivalent Organic Matter Condition in a Tier Soil
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图1. 陕西省关中平原冬小麦-夏玉米种植区土壤样品采集点分布图 |
Fig. 1. The distribution of soil sampling sites in Guanzhong Plain of Shaanxi Province under winter wheat-summer maize cropping |
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