氮素营养对枣树花和果实生长发育的影响研究

Effect of Nitrogen Application on Jujube Floral development and Fruit Growth

本文研究了氮素营养对枣树花和果实生长发育的影响。不同器官氮素水平有明显的季节变化规律，施氮肥不影响这种变化规律，但能提高各期不同器官的氮素水平。蕾期至盛花期叶片氮素水平极显著地影响枣花数量和质量。施氮肥能延长开花持续时间和座果时间，提高座果率，但施氮肥宜早。施氮肥对果实生长发育规律基本无影响，但能提高其生长速度，降低落果率。

The impact of nitrogen application on the floral development and fruit growth of thejujube tree(Ziziphus jujuba)was studied. Results showed that the nitrogen content in eachorgan varied markedly with the season. Although applying nitrogen to the tree did not affectthis pattern of variation,it did add to the nitrogen content in the organs in any stage ofdevelopment and growth. The nitrogen content of the leaf during the bud stage and the fullbloom stage greatly influenced the flower quantity and quality. When duly applied,thenitrogen fertilizer or manure could prolong the flowering phase and the fruit settingduration,thus promoting the percentage of fruit set. It is for this purpose that earlyapplication of the nitrogen nutrient is recommended. The study also showed that nitrogenapplication hardly affected the growth pattern of the fruit,but it helped the fruit to growfaster and lower the percentage of fruit drop.