| 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N 0.6 kg/株）、N3（施纯N 1.2 kg/株）、N4（施纯N 2.4 kg/株）和N5（施纯N 4.8 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。 |
| 关键词: 氮肥 苹果 叶片 新生枝条 营养动态 |
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| 基金项目: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） |
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| Effect of N supply on the developments of N in leaves and new branches in “Fuji” apple |
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| Abstract: |
| 【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 (P<0.05 or P<0.01),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. |
| Key words: nitrogen apple leaf new branch development of nutrients |
