摘要
以3年生初结果的鸭梨/杜梨为试材,用^(15)N示踪技术探讨了秋施、春施及夏施肥料氮在土壤-植物中的平衡及其效应。结果表明,肥料氮损失量与植株吸收量之比表现为夏施>秋施>春施;肥料氮利用率以春施最高,秋施次之,夏施最低。肥料氮在植株体内的分配基本上随生长中心的转移而转移,无果中、短枝有优先累积肥料氮的效应。以秋施肥料氮的分配与植株生长节奏最吻合,并能刺激生长势弱的植株吸收利用肥料氮。显示出秋施氮对植株的效应最好。
The effect of N applied at different time to 'yali' pear was studied by using 15N-label>led urea as a tracer.The results were as follows:The ratio of fertilizer-N lost to utilized was in an order of summer application>autumn application>spring application,but the fertili zer-N utilization efficiency was in the reverse order.The distribution of %NDFF in plant parts was changed with the translocation of growth centre,and the spurs could accumulate more NDFF.The distribution direction of fertilizer-N applied at autumn coincided well with the growth rhythm,and could stimulate the tree of poor growth vigor to absorb more fertilizer-N.It was concluded that the autumm application fertilizer to 'yali' pear has the best effect.
出处
《核农学报》
CAS
CSCD
1992年第2期70-74,共5页
Journal of Nuclear Agricultural Sciences
基金
河北省科学技术委员会资助
关键词
梨
鸭梨
氮肥
施肥
效应
'YALI' pear,nitrogen application time,balance of fertilizer-N,15N-urea
