【摘要】 为探究植物生长调节剂"稀施保"对玉米抗倒性和产量等性状的影响,选择玉米品种苏玉29为试验材料,设置67 500、75 000、82 500、90 000株/hm~2共4个种植密度,以清水处理为对照,分析大喇叭口后期施稀施保对玉米抗倒伏性和产量构成因素的影响,明确稀施保在玉米上的应用效果。结果表明,随着种植密度的增加,无论是清水处理还是稀施保处理,苏玉29的株高均呈先升高后降低的变化,穗位高、倒伏率、空秆率、秃尖均呈上升趋势,茎粗、穗粒数和千粒重均呈现下降趋势。与清水处理相比,稀施保处理的玉米株高、穗位高均有所降低;各密度下的倒伏率均有所降低,平均倒伏率显著降低。种植密度由67 500增加到90 000株/hm~2,稀施保处理下苏玉29的理论产量分别较同密度清水处理提高了10.2%、8.5%、6.8%和6.2%,在密度为90 000株/hm~2时达最高值12 689.6 kg/hm~2。更多还原

【Abstract】 Suyu 29 was selected as experimental material to explore the effects of plant growth regulator Xishibao on lodging resistance and yield. Four planting densities of 67 500, 75 000, 82 500 and 90 000 plants/hm~2 were set in the experiment, and the water treatment was taken as the control. The effects of Xishibao on lodging resistance and yield components of maize in the later stage of megabell were analyzed. The application effects of Xishibao on maize were clarified. Results showed that with the increase of planting density, the plant height of Suyu 29 increased firstly and then decreased in the treatments of clear water and Xishibao. Ear height, lodging rate, empty stem rate and bald tip showed an upward trend, while stem diameter, grain number per spike and 1 000-grain weight showed a downward trend. Compared with the water treatment, the plant height, ear height and the lodging rate of each density under the Xishibao treatments were decreased;the average lodging rate was significantly reduced. The planting density of maize increased from 67 500 to 90 000 plants/hm~2, and the theoretical yield increased by 10.2%, 8.5%, 6.8% and 6.2%, respectively, compared with the same density of water treatment, and the highest value reached 12 689.6 kg/hm~2 at the density of 90 000 plants/hm~2 under the Xishibao treatments.更多还原