玉米是雌雄同株异花授粉的作物。及时抽去雄穗(蓼),使养分集中于雌穗,可能增产。一九七一年,在凌源县欺天公社欺天大队九队,进行了玉米抽雄试验,初步结果如下:玉米品种是“旅北”单交种。试验有三个处理,第一,出蓼始期隔株去 Corn is a monoecious cross-pollination of crops. Promptly remove the tassel (Polygonum), so that nutrients concentrated in the ear, may increase production. In 1971, nine teams of cheating Brigade Battleship Commune in Lingyuan County conducted a maize tasselling test. The preliminary results are as follows: The maize variety is the “cross-northern” single cross breed. There are three tests to deal with, first, out of the beginning of each period of Polygonum to go