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采用盆栽试验,模拟田间生态环境,研究施用不同缓/控释氮素肥料在玉米苗期的土壤尿素态氮、硝态氮、铵态氮及矿质态氮数量。研究表明,施用醋酸酯淀粉包膜脲酶抑制剂NBPT涂层大颗粒尿素肥料的尿素态氮含量最高,为21.29 mg kg-1土;硝化抑制剂DCD与NBPT混合涂层大颗粒尿素、醋酸酯淀粉包膜DCD与NBPT混合涂层大颗粒尿素的铵态氮含量最高,分别达到60.22 mg kg-1土和59.93 mg kg-1土,硝态氮含量最低,分别为29.82 mg kg-1土、27.97 mg kg-1土,相互间差异不显著;醋酸酯淀粉包膜大颗粒尿素的硝态氮和矿质态氮含量都最高,分别为102.08 mg kg-1土和135.25mg kg-1土,铵态氮、尿素态氮含量最低,分别为33.16 mg kg-1和3.42 mg kg-1土,相互间无显著差异;DCD与NBPT混合涂层大颗粒尿素、丙烯酸树脂包膜NBPT涂层大颗粒尿素、醋酸酯淀粉包膜DCD与NBPT混合涂层大颗粒尿素和丙烯酸树脂包膜DCD与NBPT混合涂层大颗粒尿素在玉米苗期的土壤矿质态氮含量最少,相互间无显著差异,分别为89.75 mg kg-1土、93.70 mg kg-1土、88.19 mg kg-1土和86.22 mg kg-1土,说明它们在玉米苗期氮素养分释放量最少,包膜和抑制剂的作用效应较好。
Pot experiments were conducted to simulate the ecological environment in the field. The contents of urea nitrogen, nitrate nitrogen, ammonium nitrogen and mineral nitrogen in soils with different slow / controlled release nitrogen fertilizers were studied. The results showed that the application of acetate starch coated urease inhibitor NBPT coated large particle urea fertilizer urea nitrogen content of the highest, 21.29 mg kg-1 soil; nitrification inhibitor DCD and NBPT mixed coating of large particles of urea, acetate starch The content of ammonium nitrogen in the coated DCD and NBPT mixed coating was the highest, reaching 60.22 mg kg-1 soil and 59.93 mg kg-1 soil respectively, with the lowest nitrate nitrogen content of 29.82 mg kg-1 soil and 27.97 mg · kg- mg kg-1 soil, with no significant difference between them. The contents of nitrate nitrogen and mineral nitrogen in starch acetate coated granular urea were the highest, 102.08 mg kg-1 soil and 135.25 mg kg-1 soil, Nitrogen and urea nitrogen content were the lowest, which were 33.16 mg kg-1 and 3.42 mg kg-1 soil respectively. There was no significant difference between them. Large-particle urea of DCD and NBPT coating, large-particle urea of NBPT coating of acrylic resin coating, Acetate starch coating DCD and NBPT mixed coating Large particle urea and acrylic resin coating DCD and NBPT mixed coating Large particle urea in the seedling stage of the soil mineral nitrogen content is minimal, no significant difference between them, respectively 89.75 mg kg-1 soil, 93.70 mg kg-1 soil, 88.19 mg kg-1 soil and 86.22 mg kg- 1 soil, indicating that they have the least amount of nitrogen nutrient release in maize seedling stage, and the effect of coating and inhibitor is better.