矿质营养对锦橙裂果的影响

锦橙植株喷K能显著提高叶片含K量,可减轻裂果发生。裂果果皮含K量显著低于正常果皮。叶片有效B含量较高有助于减轻裂果发生。叶片K、B含量与裂果率呈高度负相关,并呈极显著的线性回归关系。果皮有效B含量与裂果率呈显著负相关。叶片含K1.30％、有效B26ppm可能是裂果严重发生的临界值。叶片K与有效B呈显著正相关和高度的线性回归关系。K、B间的相助作用有利于减轻裂果发生。果皮K与Ga呈极显著负相关和高度的线性回归关系。Ca可能通过对K的强烈拮抗作用间接影响裂果发生。本文还讨论了低K、B导致裂果的机制,并提出了减轻裂果的措施。

EFFECT OF MINERAL NUTRITION LEVELS ON FRUIT SPLITTING IN JIN-CHENG ORANGE

Spraying potassium on Jin-cheng orange (C. cinensis Osbeck) trees had an increase in K content and a decrease in fruit splitting significantly. K content in peel of splitting fruits was obviously lower than that of normal fruits. Higher level of effective B in leaves was beneficial to reducing splitting. There was a very high negative correlation and a very significant-linear regression eorrelation between K,B content and fruit splitting rate. There was a significant negative correlaion between effective B in peel and fruit splitting rate. K content about 1.30% and effective B about 26 ppm in leaves appear to be the critical value of fruit splitting will occur seriously. There was also a very significant positive correlation and a very highly linear regression correlation between K and effective B level in leaves. The synergism between K and B may help to reduce fruit splitting. There was a very significant negative correlation and a very highly linear regression correlation between K and Ca in peel.Ca may affect fruit splitting indirectly by means of strong antagnism to K. It was discussed about the possible mechanism that low level of K and B caused fruit splitting. The authors suggested some measures to lessen fruit splitting forthe growers.