糯米糍荔枝结果期叶、果营养消长及其与落果的关系

对糯米糍荔枝果实发育期间叶片和果实进行Ｎ、Ｐ、Ｋ、Ｃａ、碳水化合物的营养测定，结果表明：荔枝果实发育前期对Ｎ的需求量最大，其次是Ｋ，果实后期发育对Ｋ的需求量大于Ｎ，果期叶片Ｐ的变化平稳，果实对Ｐ的要求不太敏感。前期和后期的生理落果均与Ｎ、Ｋ营养有关，其中前期与Ｎ、后期与Ｋ关系更大，中期胚败育期间，果实营养维持在最低水平，与该期落果直接相关。Ｃａ素变化和碳水化合物的消长也与生理落果有密切关系。

Nutritional Component Fluctuation in Leaves and Fruits of Litchi(Litchi Chinensis Sonn. cv. Nuomici)During the Period of Fruit Development and Its Relation with Fruit-drop

Nutritional component(N、P、K、Ca and Carbohydrate)of leaves and fruits during the period of Litchi(Litchi chinensis Sonn. cv. Nuomici)fruit development were determined in this experiment,The resultsshowed that the maximum amount of nitrogen was required in earlier stage of Litchi fruit growth and devel-opment,and the less of potassium. The requirement of potassium in the later stage of Litchi fruit growth wassuperior to nitrogen,The phosphorus contents of leaves during fruit growth were stable,and fruit was insen-sible to the phosphorus changes, The physiological fruit drop in the earlier stage were closely related to nitro-gen for the first and potassium for the second,but the opposite in the later stage,fruit nutritional state main-tain the lowest level during the peroid of embryo abortion, to be related directly with the middle stage fruitdrop.The changes of calcium and carbohydrate in Litchi fruit are also related to the fruit drop.