不同播期对冀东地区玉米田禾蓟马发生量和玉米产量的影响

为了探索冀东地区玉米播期与禾蓟马发生量和玉米产量之间的关系，以生产常用玉米品种郑单958为试材，在4月30日～7月19日每隔10d设定1个播期，研究了9个不同播期处理对禾蓟马发生量和玉米产量的影响，以确定冀东地区玉米禾蓟马为害率较低且产量较高的适宜播种日期。结果表明：随着播期的推迟，禾蓟马发生量呈增加一减少一增加的趋势，玉米产量呈减少一增加一减少的趋势，其中，4月30日播种的玉米未见到禾蓟马发生、产量最高，5月10日和6月29日播种的玉米虫害率较低、产量较高，但3个播期处理的玉米产量差异均不显著。建议冀东地区春播玉米选择4月30日～5月10日播种，夏播玉米选择6月29日前后播种，以降低禾蓟马对玉米产量的影响。

Effects of Different Sowing Dates on Yield of Corn and Amount of Thrips in Corn Field of Eastern Hebei Area

In order to explore the relationship between the sowing date of corn and amount of thrips and yield of corn in eastern Hebei area, taking commonly used corn variety Zhengdan 958 as test material, the sowing dates was set every 10 days from April 30 to July 19, and the effects of 9 different sowing dates on amount of thrips and yield of com were studied to determine the suitable sowing date of corn in eastern Hebei area. The results showed that the amount of thrips and yield of corn were all showed increased-decreasd-increasd trends with the sowing date delaying, the yield of corn was highest and thrips was not occurred when the corn were sowed on April 30, and damage rate of corn was lower and yield of corn was higher when sowed on May 10 and June 29, but there was no significant differences on yield of corn among 3 sowing dates. It suggested that to reduce the influence of thrips on the yield of corn, spring-sowing corn should be sowed from April 30 to May 10, and summer-sowing corn should be sowed around June 29 in eastern Hebei area.