调节脐橙树体营养预防脐黄落果脐橙脐黄落果被认为是脐橙生产中的“不治之症”。笔者经过调查和定点试验后，认为脐黄是一种生理现象，是因树体营养与生殖生长不协调造成，并非是病理性危害。其理由有三：其一，脐黄多发生于７～８年生以下的结果树，尤其是４～５年生幼龄... Regulation of Navel Orange Tree Nutritional Preventing Navel Yellow Drops Navel Orange Navel yellow droplet is considered an “incurable disease” in navel orange production. The author after investigation and sentinel test, that umbilical yellow is a physiological phenomenon, is due to tree nutrition and reproductive growth caused by uncoordinated, not pathological hazards. There are three reasons for this: First, umbilical cord occurs more than the results of trees below 7 to 8 years old, especially 4 to 5 years old ...