涟水县地处黄淮平原东部 ,玉米是该县主要的粮、饲作物之一 ,常年种植 1 .5万 hm2 ,其中 ,夏玉米种植面积占 80 %以上。从 90年代以来 ,该县大面积推广使用乙草胺防除玉米田杂草 ,但由于乙草胺使用适期短 ,年度间的防效受土壤墒情影响大 ,杂草严重威胁夏玉米的正常生长 ,制约着 Lianshui County is located in the eastern part of the Huanghuai Plain, where maize is one of the major grains and feedstuffs in the county. It has been planted for 15,000 hectares annually, of which more than 80% of summer maize is planted. Since the 1990s, acetochlor has been widely used in the county to control weeds in cornfields. However, due to the short duration of use of acetochlor and annual control effect due to soil moisture, the weeds severely threaten the normal growth of summer maize , Restricted