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禾大壮又叫“草达灭”,是稻田除稗专用的选择性除草剂,成品为96％乳油。我们在试验推广使用禾大壮防除稻田稗草时,发现它对高龄稗草有较强的毒杀效能。试验采用人工播种稗草,于1983年5月8日—5月20日每隔三天播一小区,共播五个小区。每小区10平方尺,播种用经过浸种催芽的稗籽20粒,播后统一管理,让其自然生长。待最早播种的稗草达7叶龄,多数分蘖4—5个,和最后一批播种的稗草达4叶龄时,按亩用药量200毫升,兑水30市斤喷雾,施药后10天、30天各调查一次。效果良好,见下表。结果表明:稗草4—5叶时施药,药后10天
Wo Dazhuang, also known as “grass up off”, is a special selective herbicides in paddy fields except barnyard grass, finished product is 96% EC. We tried to promote the use of straw to prevent barnyard grass in the paddy field, we found that it has a stronger old barnyard grass poisoning efficacy. Tests were conducted by artificial sowing of barnyardgrass, sowing a plot every three days from May 8 to May 20, 1983, broadcasting a total of five plots. Each plot of 10 square feet, sowing with seed soaking barnyard seeds 20, after sowing unified management, let its natural growth. To be the earliest sowing of barnyard grass up to 7-leaf age, the majority of tillers 4-5, and the last batch of sowing of barnyard grass up to 4-leaf age, according to the amount of mu 200 ml, watered down 30 kg kg, 10 Day, 30 days of each survey. Good effect, see the table below. The results showed that: barnyardgrass 4-5 leaf application, after 10 days