论文部分内容阅读
通过不同品种、不同密度配置研究春玉米生育进程、物质生产水平以及产量构成,分析不同玉米品种在辽东南地区产量及生长特性,探讨提高产量的关键限制因素。结果表明,丹玉405等稀植大穗型晚熟品种在30 000株/hm2时产量最高;郑单958、农华101等紧凑中熟、中晚熟品种在45 000~60 000株/hm2时产量最高。随密度增加,各品种千粒重下降,穗粒数降低,倒伏率和空秆率随密度增加而增加。
Through the research on the growth process, material production level and yield composition of spring maize by different varieties and different densities, the yield and growth characteristics of different maize varieties in southeastern Liaoning were analyzed, and the key limiting factors to increase yield were discussed. The results showed that Danyu 405 and other sparsely-grown large-spike late-maturing varieties at 30 000 plants / hm2 the highest yield; Zheng Dan 958, Nong Hua 101 and other compact maturing, late maturing varieties at 45 000 ~ 60 000 plants / hm2 production highest. With the increase of density, the grain weight of all varieties decreased, the grains per spike decreased, and the lodging rate and empty stalk rate increased with the increasing of density.