施氮量对甘蔗氮素吸收与利用的影响  

Effect of application amount of nitrogen fertilizer(^(15)N) on nitrogen absorption and utilization in sugarcane

作　　者：韦剑锋[1,2] 梁启新 陈超君[4] 蓝立斌[4] 梁和[4] 

机构地区：[1]广西工学院鹿山学院,广西柳州545616 [2]广西工学院,广西柳州545006 [3]南宁市农业技术推广站,广西南宁530000 [4]广西大学农学院,广西南宁530005

出　　处：《广东农业科学》2011年第19期66-68,共3页Guangdong Agricultural Sciences

基　　金：广西自然科学基金(桂科自0832051)

摘　　要：在土壤低氮(碱解氮68.85 mg/kg)条件下,以新台糖22号(ROC22)为试材,分别施用15N标记的尿素2.5、5.0、7.5 g/盆,研究了氮肥施用量对甘蔗氮素吸收与利用的影响。结果表明,随着氮肥施用量的增加,甘蔗干物质积累、氮素积累、来源于肥料氮素的比率及土壤有效氮含量不同程度增加,但甘蔗氮肥利用率显著下降;施氮量明显影响甘蔗各器官的干物质分配、氮素分配、氮肥利用率及氮素在不同土层的分布;甘蔗主要吸收20~40 cm土层的氮素。甘蔗施用氮肥应考虑适宜的量和土层深度。Under low （available N 68.85 mg/kg） nitrogen of soil,three treatments were desiged with 2.5 g, 5.0 g and 7.5 g 15N-labeled urea/pot respectively, to study the effects of different application amount of nitrogen fertilizer on nitrogen absorption and utilization in sugarcane varieties ROC22. The results were as follows： dry matter accumulation, nitrogen accumulation, the proportion of N from nitrogen fertilizer in sugarcane and available nitrogen content in soil increased with the amount increase of nitrogen fertilizer, while nitrogen utilization rate in sugarcane decreased significantly. The nitrogen fertilizer application had obviously influence on dry matter distribution, nitrogen distribution, nitrogen utilization rate in sugarcane organ and nitrogen distribution in soil. The nitrogen of sugarcane uptaked was most from the soil of 20-40 cm depth. The appropriate amount and soil depth of nitrogen fertilizer application should be considered to increase nitrogen utilization efficiency in sugarcane.

关 键 词：甘蔗 氮素 15N标记 干物质积累 土壤 氮肥利用率 

分 类 号：S143.1[农业科学—肥料学] S566.1[农业科学—农业基础科学]