水直播三系制种在6月中旬栽插父本,6月下旬播种母本,母本亩用种量3～3.5公斤。两行父本之间幅宽2.3米,父本栽插后至母本落谷前的这段时间中,杂草种子的大量萌发对父本分蘖影响大。据试验,不用药剂防除的杂草严重的田块,父本平均单株茎蘖数3.67个,而用药防除的田块平均单 Water directing three lines planted in mid-June planting male parent, sowed in late June the mother, the mother of mu with 3 to 3.5 kg of seed. Between the two lines of the width of 2.3 meters, after the male parent planted to the mother before falling into the valley during this time, a large number of weed seeds germination on the male parent tiller effect. According to the test, without the pesticide to control the serious weeds, the average number of male parent tiller 3.67, while the drug control plots average