我县地处长江下游,每年春播玉米制种3000亩左右,三月中下旬播种,母本吐丝期和父本散粉期多在六月中下旬,此时正逢梅雨季节。过去只搞一期父本,父本花期只有7天,而母本花期可延至15天左右,这样,约占母本总数20%植株,常因吐丝较迟,受不到父本花粉,不能正常受粉结产;若父本散粉期遇连绵阴雨,母 My county is located in the lower reaches of the Yangtze River, about 3,000 acres of maize spring planting every year, sowing in mid to late March, female parent silking period and the father of loose powder more in late June, at this time coincided with the rainy season. In the past only engaged in a paternity, the father of the flowering period of only 7 days, while the flowering period can be extended to about 15 days, so that about 20% of the total number of female plants, often due to silking later, often less than the parental pollen, Can not be normal by powder production; if the father of loose powder in case of continuous rain, mother