增施氮肥和环剝对枣树光合速率的影响

Effects of Some Cultural Methods on Photosynthesis of Chinese Jujube

于1987、1988年采用红外CO_2分析仪研究了某些栽培措施对枣树光合作用的影响。结果认为,在一定施氮水平下,枣树叶片的光合速率与叶片含氮量及氮素施用量呈显著正相关;5月末6月初叶面喷施尿素,磷酸二氢钾及赤霉素,均可在处理后10-20d显著提高叶片的光合速率,环剥可显著降低叶片的光合速率。

In 1987 and 1988, the effects of some cultural methods on pho- tosynthesis of Chinese jujube(Zizyphus jujuba Mill.)were studied with infra-red CO_2 analyser. The results were as follows: With certain range of nitrogen supply there are significantly positive relations between the photosynthetic rates of the leaves, the leaf nitrogen contents and nitrogen supply levels. The photosynthetic rates of the leaves were in- creased after 10~20days when the leaves were sprayed with N,P and GA_3 in late May and early June, but were considerably decreased when the trees were ringed.