营养平衡与代谢对锦橙裂果的影响

严重裂果的锦橙叶片和裂果果皮的Ｋ，Ｃａ和Ｍｇ元素处于不适宜的平衡状态。低Ｋ水平，出现在低Ｋ／Ｃａ＋Ｍｇ，Ｋ／Ｃａ或低Ｋ／Ｍｇ比值下，叶片Ｋ／Ｃａ，Ｋ／Ｍｇ，Ｋ／Ｃａ＋Ｍｇ比值和果皮Ｋ／Ｍｇ比值与裂果率呈极显著或显著负相关和高度线性回归关系。叶片和果皮的Ｃａ／有效Ｂ比值与裂果率呈显著或极显著正相关及高度线性回归关系。Ｃａ／有效Ｂ比值比单纯的Ｃａ，Ｂ营养强度指标能更好地反映与裂果发生的关系。在锦橙裂果

EFFECTS OF NUTRIENT BALANCE AND NUTRIENT METABOLISM ON FKUIT SPLIT IN JINCHENG ORANGE,CITRUS SINENSIS OSBECK

The effects of the nutrient balance and nutrient metabolism on fruit split inJincheng orange(Citrus sinensis Osbeck)were studied in different seasons,The resultsshowed that K,Ca and Mg in the leaves and peel of highly-splitted oranges were not in anappropriate balance state,as low K content was induced by low K /Ca Mg ratio or low K/Ca,K/Mg ratio.It was suggested that the critical value of nutrient ratio was that,whetheror not fruit split occured largely on trees and whether fruits splitted or not,there were verysignificant negative correlations and high linear regression correlations among K/Ca,K/Mg and K/Ca Mg ratio in the leaves and K/Mg ration in the peel with the incidence of fruit split.There was also a significant or very significant positive correlation and high lin-ear regression correlation between Ca/effective B ratio in the leaves and peel with the inci-dence of fruit split.Ca/effective B ratio can better reflect the relation between Ca and B nu-trients and fruit split in comparision with the indexes of Ca and B intensity,During the pe-riod of time when a large number of splitted fruit appeared on the trees,the character ofrnetabolism was that the Ca content increased greatly while K content decreased succes-sively.