【作者】 宁建凤； 操君喜； 邹献中； 杨少海； 陈勇；

【Author】 Ning Jianfeng Cao Junxi Zou Xianzhong Yang Shaohai Chen Yong (Soil and Fertilizer Research Institute,Guangdong Academy of Agricultural Sciences,Guangzhou 510640)

【机构】 广东农业科学院土壤肥料研究所；

【摘要】 利用网室盆栽试验,研究不同氮肥品种和用量对油麦菜产量、氮素吸收及土壤氮淋失的影响。结果表明,施用不同品种氮肥均明显增加油麦菜产量和植株吸氮量,但氮用量过高不利用油麦菜生长;不同氮肥处理下.油麦菜植株氮肥利用率均随氮用量增加而降低;相同氮用量条件下,施用碳酸氢铵处理的油麦菜产量低于尿素和硝酸铵处理。不同氮肥处理下,土壤总氮、硝态氮和铵态氮淋失量随氮用量增加总体呈增加趋势;同一处理的硝态氮淋失量均高于铵态氮。相同氮用量条件下,硝酸铵处理的土壤总氮、硝态氮淋失量较高,而碳酸氢铵处理的土壤铵态氮淋失量较高。本试验条件下,综合考虑油麦菜产量、植株氮素吸收和土壤氮素淋失等情况,尿素和硝酸铵施氮量在0.10g N/kg土、碳酸氢铵施氮量在0.15g N/kg土较为适宜。更多还原

【Abstract】 In the net room,pot experiments were conducted to study the effects of different nitrogen fer- tilizers(urea,ammonium nitrate,ammoumium bicarbonate)on the growth of leaf-used lettuce and the soil nitrogen leaching.The results showed that,yields of leaf-used lettuce and nitrogen uptake of plants were improved significantly with different nitrogen fertilizers application.However,nitrogen application with high rate inhibited the growth of leaf-used lettuce.Under conditions of the same nitrogen applica- tion rate,yields of leaf-used lettuce was lower with fertilizer of ammoumium bicarbonate than that of fertilizer of urea and ammonium nitrate.It was also found that leakage amount of soil total nitrogen and narrate nitrogen increased dramatically with the increase of the different nitrogen fertilizers applied.The leakage amount of nitrate nitrogen was higher than that of ammounium nitrogen in the same treatment. The soil leakage ammount of total nitrogen and nitrate nitrogen were higher with fertilizer of ammonium nitrate than that of fertilizer of urea and ammoumium bicarbonate.Under conditions of this experiments, comprehensive consideration of leaf-used lettuce yields,plant nitrogen uptake and soil nitrogen leaching, the nitrogen application rate of urea,ammonium nitrate,ammoumium bicarbonate was 0.1gN/kg soil, 0.1gN/kg soil and 0.15gN/kg soil respectively should be suggested in the leaf-used lettuce fertilization.更多还原