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。
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.
出处
《中国农学通报》
CSCD
2006年第9期242-245,共4页
Chinese Agricultural Science Bulletin
基金
美国磷肥基金会资助
加拿大磷钾研究所"磷矿粉肥直接施用("国际合作)提供资助。
关键词
磷矿粉
酸性土壤
幼苗试验
有效磷
Phosphate Rock, Acid soils, Seeding test, Effective Phosphorus
