摘要
在田间试验条件下利用^15N示踪技术,于有机质含量为25.7g·kg-1的黄壤上,研究了烤烟在移栽后5、7、9周小麦秸秆还田对烤烟氮积累、肥料氮积累、肥料氮分配以及氮肥利用率,结果表明,当地常规施肥条件下,烤烟于移栽后13周肥料氮积累达到高峰,氮供应拖后,随烤烟生育期的增加,烟株来自肥料氮比例逐渐减低,烤烟生育前期主要吸收肥料氮,后期以吸收土壤氮为主。秸秆于烤烟移栽后5~9周期间还田后,烟株氮积累、肥料氮积累量和来自肥料氮比例及氮利用率均表现降低,并随秸秆还田时间的推迟,对肥料氮的影响逐渐减少。
The effect of wheat straw on N accumulation and distribution in flue - cured tobacco and ^15N uptake and use efficiency of 15N fertilizer was studied on yellow soil in Gnizhou province, when wheat straw returned soil in 5, 7 and 9 weeks after trans- planting respectively. The results indicated that fertilizer N accumulation reached high level in 13 weeks after transplanting, N ab- sorption time was later than that of the tradition N application. The N uptake in tobacco plant was mainly from N fertilizer in early growth stage and from soil in late growth stage. N accumulation in tobacco plant, 15N accumulation, ratio of N from fertilizer, and 15N use efficiency were decreased when wheat straw returned field during 5 - 9 week after tobacco transplanting, and the effect of wheat straw on 15N absorption also decreased as the time delaying of straw return to field.
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2008年第4期43-46,共4页
Soil and Fertilizer Sciences in China
基金
国家烟草专卖局科技项目(110200601014)
关键词
秸秆
烤烟
氮分配
烟碱
wheat straw returning soil
flue - cured tobacco
N distribution
N utilization