为大面积提高双季晚稻秧苗素质,多年来,我们强调稀播培育壮秧,但因茬口矛盾和管理水平等问题而收效不大。1988年我们引进了植物生长调节剂多效唑,在二季晚稻上进行多点试验示范,初步获得了一些结果。现报道如下,供参考。 一、示范情况 全县安排了四个点,示范品种为鄂宜105、皖粳1号、“8720”等,秧田面积21.7亩,播期6月17～18日,插期7月21日至8月3日,秧苗1叶1心时每亩喷施浓度为300ppm的多效唑药液100公斤,共插大田148.6亩。经田间调查和实打验收,看出多效唑对晚稻有以下的一些明显效应。 1.控制株高徒长,提高秧苗素质 据观察,经 For many years to improve the quality of double-season late rice seedlings, over the years, we emphasize the sparse seedling cultivation, but because of stubble contradictions and management issues such as less effective. In 1988, we introduced the plant growth regulator paclobutrazol, carried out in the late seasons rice multiple-point demonstration, preliminary results were obtained. Are reported below, for reference. First, the demonstration situation The county has arranged four points, the model varieties for the E 105, Anhui japonica 1, “8720” and so on, seedling area of ​​21.7 acres, sowing June 17 to 18, the date of July 21 to On August 3, 100 kg of paclobutrazol solution with a concentration of 300 ppm per acre was sprayed on seedlings of 1 leaf and 1 heart, and a total of 148.6 mu of Daejeon were inserted. After field investigation and actual acceptance, we can see that paclobutrazol has some obvious effects on late rice. 1 control plant height, improve seedling quality According to observation, by