| Abundance and deficiency indices of soil available P for wheat and fertilization recommendation in Shajiang black soil areas |
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| DOI：10.7606/j.issn.1000-7601.2010.02.33 |
| Key Words: wheat ASI phosphorus abundance and deficiency indices |
| Author Name | Affiliation | | SUN Kegang | Institute of Plant Nutrition, Agricultural Resources and Environmental Science, He'nan Academy of Agricultural Sciences, Zhengzhou, He'nan 450002, China | | LI Bingqi | Institute of Plant Nutrition, Agricultural Resources and Environmental Science, He'nan Academy of Agricultural Sciences, Zhengzhou, He'nan 450002, China | | HE Ailing | Institute of Plant Nutrition, Agricultural Resources and Environmental Science, He'nan Academy of Agricultural Sciences, Zhengzhou, He'nan 450002, China | | JIN Xiuzhe | He'nan Vocational College of Agriculture, Zhongmu, He'nan 450002, China |
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| Abstract: |
| To provide theoretic support for formula fertilization in wheat production by soil testing in Shajiang black soil areas, field experiments on fertilizer efficiency of winter wheat were carried out. The study used ASI (Agro Services International) method to test soil samples and calibrate ASI soil test according to the typical response categories (50%, 65%，75% and 95% of relative yield to soil nutrient values) to establish the abundance and deficiency indices of soil available P for wheat in Shajiang black soil areas based on ASI soil testing and fertilizer recommendation. The very low, low, medium, high and very high indices for soil available P were ＜7 mg/L, 7～12 mg/L, 12～18 mg/L, 18～38 mg/L, and＞38 mg/L, respectively. This experiment suggested that the recommended fertilization rates were 135 kg/hm2, 105 kg/hm2, 90 kg/hm2 and 75 kg/hm2. When soil available P was＞38 mg/L, the fertilization rate can be very little or even not applied. |
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