浚单20玉米杂交制种适宜播期与密度研究

为提高玉米杂交制种的产量,研究了不同播期和密度对浚单20玉米杂交种产量及农艺性状的影响,结果表明:浚单20杂交组合制种母本的最佳播种期为4月15日,适宜密度为7.5万～8.25万株/hm2,平均产量达8257.05 kg/hm2。在甘肃省张掖市应从4月15日开始尽量早播,不能晚于4月25日。在实际生产中因地制宜调整好播种密度,在低水肥条件下以7.5万株/hm2为宜;在高水肥条件下以8.25万株/hm2左右为宜。

Study on Suitable Sowing Date and Planting Density of Xundan 20 in Production of Hybrid Maize Seeds

In order to improve the production of hybrid maize seeds,a field trail was conducted to investigate the response of yield and agronomic traits of Xundan 20 to different sowing dates and different planting densities in Hexi Corridor.It was shown that the best sowing date for the female parent of hybrid combination Xundan 20 was April 15th,and the suitable planting density was 75000～82500 plants/hm2,under these conditions,the average yield of Xundan 20 in hybrid seed production was 8257.05 kg/hm2.In the Hexi Corridor area,the female parent of hybrid maize Xundan 20 should be sown as early as April 15th,and no later than April 25th.The planting density could be adjusted according to the local conditions in the practical hybrid seed production: under the condition of low water and fertilizer,75000 plants/hm2 was the best;under the condition of abundant water and fertilizer,82500 plants/hm2 was the best.