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采用随机区组试验方法,进行谷田杂草常见种类调查,并对其中主要发生种类的发生规律进行了研究。结果表明,河北省谷田常见杂草38种,分属15个科,发生基数较大的杂草有20种。春播谷田以双子叶杂草为主,占杂草总数的60.08%,夏播谷田以单子叶杂草为主,占杂草总数的64.38%。春播谷田杂草发生有3个峰期,分别为5月中旬,6月下旬,7月上、中旬。夏播谷田杂草发生仅1个峰期,一般为7月上、中旬;其化学防除以44%单嘧.扑灭WP 1 800 g/hm2为最经济、有效使用剂量,可有效防控整个谷子生长期的杂草。
A randomized block experiment was conducted to investigate the common species of weed in paddy fields and the occurrence rules of the major occurrences were studied. The results showed that there were 38 common weeds in Gutian, Hebei Province, belonging to 15 families. There were 20 species of weeds with large base number. Spring sowing mainly dicotyledonous weeds, accounting for 60.08% of the total weeds, summer sowing monocotyledonous weed mainly accounted for 64.38% of the total number of weeds. There were 3 peak occurrences of weeds in spring field, which were mid-May, late June and July respectively. Summer weed valley weeds occur only 1 peak, usually in July on the middle of its chemical control with 44% of monomyopyrimidine WP 1 800 g / hm2 for the most economical and effective use of the dose, which can effectively control the entire millet Growing weeds.