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在山西运城不少市县,小麦播种量普遍较高,2013年由于商情较好,出苗率及分蘖率也普遍较高。群体过大,长势较旺。因而,防治小麦倒伏成了2013年小麦丰收的重中之重,大多数农户也早早做好了防治小麦倒伏的准备。然而,对于小麦防治倒伏的最佳时期,是返青期还是拔节期,农户各持己见。那么,小麦防倒伏,何时最理想?笔者经多年的试验实践证明,对有倒伏可能的麦田,在起身后、拔节前进行化控较为理想,拔节以后基本上起不到预防效果。
In many cities and counties in Yuncheng, Shanxi, the seeding rate of wheat is generally high. Due to the good business conditions in 2013, the emergence rate and tillering rate are also generally high. The group is too large, growing more prosperous. Therefore, the prevention and control of wheat lodging became the top priority of 2013 wheat harvest, and most of the farmers also made early preparations for the prevention and control of wheat lodging. However, the best period for the lodging and control of wheat is returning to green or jointing stage, and farmers hold their own views. So, wheat lodging, when the most ideal? The author after years of experimental practice has proved that there is a possibility of lodging in the wheat fields, after getting up, before the jointing of the ideal chemical control, after the jointing basically can not play a preventive effect.