自然降水条件下播期对玉米品种的影响

本文通过对15个品种在自然降水条件下种植的研究发现，品种间播期影响差异明显。4月20日前后播种与一个月后播种，生育期一般相差20天左右，早播一般会导致抽雄至吐丝间隔（ASI）延长，品种间差异明显，京单28等品种变化较小，有利于授粉结实。4月底5月初播种，对多数品种产量最为有利。京单28、ZX584等品种播期适应性较好，无论春播还是夏播的各个播期，生长均比较良好。京科521、农大95、农大86在4月20日前后播种优势更为明显。

Effects of Seedtime on Maize Hybrids under Natural Precipitation

The effects of seedtime on maize hybrids under natural precipitation were investigated. The results showed ASI were lengthen sowing earlier, and short ASI was benefit for pollination. Generally, planting period between end of April and beginning of May were better for yield. Some hybrids had high yield no matter planting period, such as Jingdan 28, ZX584. Some hybrids were fit for planted at end of April, such as jingke 521, Nongda 95, Nongda86, which has long growth period.