N肥用量对红富士苹果叶片和新生枝条中N营养动态的影响  

Effect of N supply on the developments of N in leaves and new branches in "Fuji" apple

作　　者：曾艳娟[1] 高义民[1] 同延安[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《西北农林科技大学学报（自然科学版）》2011年第2期197-201,共5页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家科技支撑计划项目"西北退化耕地地力恢复技术模式研究与示范"(2006BAD05B07);国际植物营养研究所项目(IPNI)

摘　　要：【目的】研究不同N肥用量对黄土高原地区红富士苹果叶片和新生枝条中N营养动态的影响,以期为果树营养诊断提供理论依据。【方法】试验共设6个处理,分别为CK（不施N,对照）、N1（施纯N 0.3 kg/株）、N2（施纯N0.6 kg/株）、N3（施纯N1.2 kg/株）、N4（施纯N2.4 kg/株）和N5（施纯N4.8 kg/株）,每处理设3次重复,随机排列,自04-29至收获前每隔30 d采集1次叶片和新生枝条样本,测定其N含量。【结果】施用N肥使红富士苹果叶片和新生枝条中的N含量都明显增加,分别较CK平均增加2.6~6.2和1.0~3.1 g/kg。5-8月,N肥用量与苹果叶片和新生枝条中的N含量之间均呈显著或极显著的相关关系,相关系数分别高达0.814 2~0.948 0和0.908 3~0.981 2。【结论】苹果树N素供应丰缺诊断可以以5-8月苹果叶片和新生枝条中N含量为依据,而其中叶片以8月、新生枝条以6-8月为最佳采样时期。【Objective】 The objective of this study was to explore the effect of different N supplies on the developments of N in leaves and new branches in ＂Fuji＂ orchard in the Loess Plateau to supply theoretical basis for nutrient diagnosis of apple tree.【Method】 The experiment contained six treatments：CK（the control treatment with no nitrogen fertilizer）,N1（0.3 kg/tree）,N2（0.6 kg/tree）,N3（1.2 kg/tree）,N4（2.4 kg/tree） and N5（4.8 kg/tree）.Each treatment had three repeats,random arrangement,sampling the leaves and new branches every thirty days from late April to early harvest.And then the N content in leaves and new branches was measured.【Result】 Results showed that the content of N in apple leaves and new branches,with the application of nitrogen obviously increased,from 2.6 to 6.2 g/kg,1.0 to 3.1 g/kg respectively compared to CK（the control treatment）;From May to August,the rates of N and the N content in apple leaves and new branches were fitted by a polynomial（P0.05 or P0.01）,the correlation coefficients reached 0.814 2-0.948 0 and 0.908 3-0.981 2 respectively.【Conclusion】 From May to August,N content of leaves and new branches can be used as the basis to diagnose the supply of N nutrient in apple trees,while August for leaves and June to August for the new branches are the best sampling period.

关 键 词：氮肥 苹果 叶片 新生枝条 营养动态 

分 类 号：S661.106.2[农业科学—果树学]