【摘要】 上海地区日本看麦娘的田间发生高峰一般出现在１１月中旬至１２月初，分蘖以１２月～翌年１月最快，生物量以２～３月增长最多。分布在０～３ｃｍ土层内的种子最易出苗，７ｃｍ以下土层内的种子基本不能发生。昼夜交替的光照、偏湿的土壤以及１０～１５℃的气温最有利于日本看麦娘的发生。合理密植能提高麦苗对杂草的竞争力，当日本看麦娘密度达到 ２２５株／ｍ２以上时必须在麦子播种后１个月内采取防除措施。更多还原

【Abstract】 The germination of Alopecurus japonicus in Shanghai region begins in the last ten days of Septem- ber and culminates from the second ten days of November to the begining of December.Tillering speed culminates form December to January of nest year and the biomass growth culminates from February to March .Seeds can ger- minate when the soil depth ranges from 0 to 7cm ,the optimum soil depth ranges from 0 to 3cm .Alternate day light and night dark ,damp soil and temperature at 10-15 are the conditions most favorable for seeds germination. Ratinal close planting of wheat or barley seedlings may strengthen their ability to compete with weed plants.Weeds should be treated with control measures within one month after sowing wheat or barley when weeds’ density is over 25 plants per 0.11m2.更多还原