桃叶片氮元素含量年变化动态研究

The Study on the Annual Change of Nitrogen Content in Peach Leaves

该试验研究了上海市21个桃园9个品种叶片氮含量年变化规律。结果表明:9个品种叶片氮含量变化有各自的特点。新凤蜜露氮含量随采样时间推移而降低,NH01园区叶片和NH02园区叶片在7月下旬至9月上旬氮含量变化较大;玉露蟠桃、锦绣黄桃、白凤塔桥、大团蜜露、油桃叶片氮含量年变化呈现逐渐降低趋势;湖景塔桥、大团湖景叶片氮含量整体变化较大。同一品种施N量不同的园片,叶片氮含量也不同。新凤蜜露因NH01园区的单株施N量大于NH02园区,因此NH01园区叶片氮含量最高值大于NH02园区叶片氮含量最高值。总体上来看,6月中旬至8月中旬期间,各品种叶片氮含量较稳定,在此期间适合营养诊断。

In this ex periment, in Shanghai, the annual change of 9 peach cultivars＇ leaf nitrogen content in 21 peach orchards were studied. The results showed that： 9 peach cultivars had different characteristics in leaf nitrogen content. With sampling time going by, the nitrogen content of peach cultivar ＂Xinfengmilu＂ decreased, the nitrogen content in peach orchard ＂NH01＂ and ＂NH02＂ changed greatly. The leaf nitrogen content of ＂Yulupantao＂, ＂Jinxiuhuangtao＂, ＂Baifengtaqiao＂, ＂Datuanmilu＂ and ＂nectarine ＂ gradually decreased in the year. The leaf nitrogen content of ＂Hujingtaqiao＂, ＂Datuanhujing＂ changed greatly on the whole. With the different N application rate of the same peach cultivar, the leaf nitrogen content was different. The leaf nitrogen content maximum of peach cultivar ＂Xinfengmilu＂ was larger in peach orchard NH01 than NH02, because the individual N application rate was more in peach orchard ＂NH01＂ than ＂NH02＂. On the whole, the leaf nitrogen content of different varieties were relatively stable from the middle of June to the middle of August, so it was suitable for nutrition diagnosis.