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以不同品种京单28和先玉335为试材,通过设置5个种植密度,采用膦酸胆碱合剂(ECK)处理,研究化学调控技术对不同密度群体春玉米根系质量及产量的影响。结果表明,随种植密度的增加,京单28和先玉335根系气生根数和总根数下降,根系干物重和根系活力降低,两个品种的双穗率、穗粒数、百粒重和单株产量均下降,空秆率上升,不同处理的子粒产量呈先增加后下降的趋势,在56 250株/hm2密度处理获得最高产量。经膦酸胆碱合剂处理后,两个品种不同密度的根系气生根数增加,根系干物重和根系活力提高,高密度条件下群体产量构成因素得到改善,两个品种均在90 000株/hm2密度处理获得最高产量。研究表明,膦酸胆碱合剂能提高根系质量,缓解玉米群体的密度效应,可为实现密植群体高产稳产提供技术支持。
Using different varieties of Jingdan 28 and Xiangyu 335 as test materials, the effects of chemical control techniques on root quality and yield of spring maize were studied by setting five planting densities and using phosphorylcholine mixture (ECK) treatment. The results showed that with the increase of planting density, the number of aerial roots and the total number of roots of Jingdan 28 and Xiangyu 335 decreased, the dry weight of roots and root vigor decreased. The double ear rate, the number of grains per ear, The yield per plant decreased and the empty stalk rate increased. The yield of different treatments increased firstly and then decreased, and the highest yield was obtained at 56 250 plants / hm2 density treatment. After treated with phosphonochloridate, the root number of aerial roots of two varieties with different densities increased, the root dry matter weight and root vigor increased, and the population yield components under high density condition improved. The two cultivars were all at 90 000 plants / hm 2 Density treatment to obtain the highest yield. Studies have shown that phosphonate choline can improve the quality of roots and mitigate the density effect of maize population, which can provide technical support for the realization of high-yielding and stable population of close-planting population.