| 酸性土壤上磷矿粉释磷机理与农学效应 |
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| 作者姓名： | 王代长 胡红青 李学垣 |
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| 作者单位： | 河南农业大学资源与环境学院，华中农业大学资源与环境学院 湖北武汉43007，华中农业大学资源与环境学院，华中农业大学资源与环境学院，郑州450002，湖北武汉43007，湖北武汉43007 |
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| 基金项目： | 美国磷肥基金会资助项目 |
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| 摘 要： | 在3种酸性土壤上,进行了直接施用磷矿粉的高粱幼苗试验和培养实验,结果表明:供试土壤严重缺磷,不施磷肥的对照处理,高粱幼苗表现出严重的缺磷症状。若以施磷(P)量为50mg/kg的过磷酸钙为参照,除JX-PR外,其它磷矿粉的肥效高于过磷酸钙的处理;四种磷矿粉的肥效一般顺序为:NPR>MPR>HJP-PR>JX-PR,与2%柠檬酸浸提的枸溶性磷和土壤速效磷(P)的增加量相一致;从幼苗的实验结果看,土壤速效磷(P)含量与高粱幼苗干物质量有良好的线性关系。磷矿粉中SiO2和CaO含量的高低影响磷矿粉直接施用的效果。
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| 关 键 词： | 磷矿粉 酸性土壤 幼苗试验 有效磷 |
P Releasing Mechanism of PRs and Agricultural Effect in Acid Soils |
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| Authors: | Wang Daizhang Hu Hongqing Li Xueyuan |
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| Institution: | 1.College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002; 2.College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070 |
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| Abstract: | The direct applications of PRs in three acid soils by Sorghum seeding and the incubation test mixed with PRs were investigated. It indicated Sorghum seeding severely appeared symptoms of P deficiency without application of P fertilizer. The fertilizer efficiency of PRs, except for JX-PR, was more efficient than that of SSP in comparison to application of 50 mg/kg SSP. The fertilizer efficiency of four PRs was NPR > MPR > HJP-PR > JX-PR, which was in according with 2% CA extractable P and with the increasing amount of soil effective P. Seeding dry matter was linear relationship with soil effective P. The amount of SiO2 and CaO in PRs had impact on its direct application. |
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| Keywords: | Phosphate Rock Acid soils Seeding test Effective Phosphorus |
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