由于防除麦田阔叶杂草的除草剂对麦田硬草无效,导致麦田硬草逐年加重,我场硬草的发生面积由1988年的几十亩扩大到1993年的4000多亩,开始在田头路边零星发生,每年向田中间扩展20—30m,一般影响产量15%左右,严重田块减产达50%以上,甚至绝收,对三麦产量影响很大。我们于1990年开始做了麦田防除硬草的试验,1991年至1993年累计示范推广1万余亩。现将试验,示范情况总结如下: Due to the control of broad-leaved weeds in the field of wheat weeds hardy grass on the invalid, leading to a hard field of grassland increased year by year, my hard field occurred in the area from dozens of acres in 1988 expanded to 4,000 acres in 1993, started in the fields Sporadic roadside sporadic expansion to Tian 20-30m each year, the general impact of about 15% of output, a serious yield reduction of more than 50% of the plots, or even over-crop, a significant impact on the production of three wheat. We started in 1990 wheat field control hard grass test, from 1991 to 1993 a total of demonstration and promotion of more than 10,000 acres. Now test, demonstration of the situation is summarized as follows: