长江中游的鄂、湘、赣、皖等省,当前柑桔生产上存在的主要问题有:冬季冻害、初夏异常落花落果、土壤缺素以及以如何开拓市场等。笔者现就这几个问题谈谈自己的看法。 ——关于冬季冻害 笔者初步探明,大冻多出现于太阳黑子低值年,约为11年一遇。预计最近又一次太阳黑子低值年,将出现于1998年前后,故届时又将有一次大冻发生。目前,有效的防冻措施是:冻前“矮干 Hubei, Hunan, Jiangxi and Anhui provinces in the middle reaches of the Yangtze River. The main problems in the current citrus production are: frost damage in winter, abnormal fall and fall in early summer, soil deficiency and how to open up the market. I now talk about these issues on their own views. - On the frost damage in winter I was initially proven, mostly appear in the cold sunspot low value year, about once every 11 years. It is estimated that the recent low sunspot year will occur around 1998 and there will be another major freeze. At present, effective antifreeze measures are: short dry before "short dry