摘要
【目的】探讨潮土有效磷的农学阈值,为潮土区科学施用磷肥提供理论依据。【方法】以35年长期定位试验为研究平台,分析长期不同施肥下土壤全磷、有效磷及PAC值对8种施肥方式(CK、N、NP、NPK、M、MN、MNP、MNPK)的响应规律。【结果】经过35年不同施肥,不施磷肥的处理(CK、N)土壤全磷、有效磷含量均有所下降;化学磷肥处理(NP、NPK)土壤全磷含量出现升高;单施有机磷肥处理及有机无机磷肥配施(M、MN、MNP、MNPK)土壤全磷和有效磷均有显著提高,年增加量分别为0. 007、0. 005、0. 013、0. 015 g/kg和0. 93、0. 84、1. 39、1. 24 mg/kg,其中仅MNP处理土壤PAC值提高幅度达到显著水平。【结论】通过分析小麦相对产量和土壤有效磷的变化趋势,土壤有效磷农学阈值为13. 41 mg/kg。
[ Objective] This paper aimed to provide a theoretical basis for the scientific application of phosphorus fertilizer and keep sustain- able high production efficiency in fluvo-aquic soil. [ Method] Based on long-term fertilization experiment in Xuzhou of Jiangsu province since 1980, the study examined the trend of change in soil total phosphorus, available phosphorus, phosphorus activation coefficient （PAC） and the critical Olsen-P value for wheat yield in eight fertilization pattemsE no fertilizer （ CK）, N fertilizer （ N）, combined N and P fertilizer （ NP）, combined N, P and K fertilizer （ NPK）, organic manure （ M）, N fertilizer and organic manure（ MN）, combination of N, P and or- ganic manure （ MNP）, combination of N, P, K and organic manure （MNPK） 1- [ Result] The long-term application of CK and N resulted in the significant decrease of soil total phosphorus and available phosphorus, NP and NPK resulted in the increase of soil total phosphorus content, and M, MN, MNP, MNPK resulted in the significant increase of soil total phosphorus and available phosphorus by 0. 007, 0. 005, 0. 013, 0. 015 g/（ kg· a） and 0.93,0.84, 1.39, 1.24 mg/（ kg · a）, respectively, of which the application of MNP increased PAC value significantly. [ Conclusion] According to the trend of wheat yield and soil available phosphorus, the critical soil available phosphorus value was 13.41 mg/kg.
作者
魏猛
张爱君
李洪民
唐忠厚
陈晓光
WEI Meng;ZHANG Ai-jun;LI Hong-nfin;TANG Zhong-hou;CHEN Xiao-guang(Xuzhou Institute of Agricultural Sciences of Xuhuai District of Jiangsu Province/Xuzhou Sweetpotato Research Center of Jiangsu Province Jiangsu Xuzhou 221131,China)
出处
《西南农业学报》
CSCD
北大核心
2018年第11期2373-2377,共5页
Southwest China Journal of Agricultural Sciences
基金
甘薯国家产业技术体系(CARS-10-B11)
徐州市农业科学院科研基金项目(XM2017003)
公益性行业(农业)科研专项经费项目(201203030)
关键词
长期施肥
潮土
全磷
有效磷
农学阈值
Long-term fertilization
Fluvo-aquic soil
Soil total phosphorus
Soil available phosphorus
Critical Olsen-P value for crop yield
