减量控释氮肥对大棚甜椒产量及土壤硝态氮、铵态氮分布的影响

Effect of Reduced Controlled Release Nitrogen Fertilizer on the Sweet Pepper Yield and Distribution of Soil Nitrate,Ammonium Nitrogen

采用田间试验方法研究不同控释氮肥施用量对大棚甜椒生长及硝态氮、铵态氮含量分布的影响。结果表明,控释氮肥处理对大棚甜椒的产量、肥料利用率、氮肥农学效率、氮肥偏生产力较常规施肥有不同程度的提高,以RF30处理最佳。各施肥处理均显著增加了土壤全氮、甜椒Vc、可溶性糖、硝酸盐的含量,降低了可滴定酸的含量。施肥处理显著增加了0-60cm土层硝态氮含量,满足了甜椒在不同时期对氮素的需求。控释氮肥处理0-60cm土层铵态氮含量差异不大,常规施肥铵态氮含量明显下降。综合考虑在农民习惯性施肥基础上施用70%控释氮肥可以保证较高的产量和较好的果实品质。

Field experiment was carried out on the growth of greenhouse sweet pepper and distribution of ammonium,nitrate nitrogen content in different controlled-release nitrogen fertilizer.The results showed that in controlled-release nitrogen fertilizer treatment,the greenhouse sweet pepper yield,fertilizer utilization efficiency,nitrogen agronomic efficiency and nitrogen partial productivity were higher than the conventional fertilization increased to different extent,and the best treatment was RF30.The fertilizer treatment significantly increased the total nitrogen,pepper Vc,soluble sugar,and nitrate content,decreased titratable acid content.The fertilization treatments significantly increased the content of nitrate nitrogen in soil layer 0-60 cm,meeting the nitrogen demand in the different stages of the sweet pepper.With controlled release nitrogen fertilizer treatments,ammonium nitrogen content in soil layer 0-60 cm were not significant,but with conventional fertilizer treatments,ammonium nitrogen concentration decreased significantly.Considering farmer habitual fertilization,70% controlled-release nitrogen fertilizer can ensure higher yield and better quality of sweet pepper.