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近几年来,由于温度异常,一些玉米制种田花期不遇,结实率较低。提高玉米制种产量,玉米种子田必须做好花期调节和花期预测,并及时采取补救措施。根据几年来的实践,我们认为调节花期时应注意以下几点: 1.根据亲本特性,搞好错期播种不同亲本对温度反应敏感程度不同,特别莫17自交系对温度反应更敏感,遇低温发育迟缓,散粉迟后遇高温干旱雄穗散粉期提前,由于我们对温度的中长期预报准确率较低,所以莫17做父本的制种田花期很难调节。例如1994年由于拔节至开花期异常高温干旱,莫17做父本的多数制种田,父本比正常年雄穗散粉期
In recent years, due to the temperature anomaly, some maize farming is not in flowering season and the seed setting rate is low. Improve corn seed production, corn seed fields must be good flowering and flowering forecast, and take timely remedial measures. According to several years of practice, we think the following points should be noted when regulating flowering: 1. According to the characteristics of parents, improve the sensitivity of different parents sowing different parents to different degrees of sensitivity, especially Mo17 is more sensitive to temperature response, Delayed hypothermia, loose powder late encounter high temperature and drought tassel early powder, due to our low temperature accuracy of the medium and long-term forecasts, so do 17 parental flowering system is difficult to regulate the flowering. For example, in 1994, due to abnormally high temperature and drought in the period from jointing to flowering, Mozambique was the father of most of the farming systems.