【摘要】 温度和土壤湿度都是杂草发生必不可少的重要条件。不同类型的杂草种子只能在一定的含水土壤中发芽出苗。鸭舌草等水生杂草种子只能在30～50%含水土壤中发芽,以40～50%的含水土壤中发芽率最高,发芽最快。绿狗尾等旱生杂草种子能在10～50%的含水土壤中发芽,以15～30%含水土壤中发芽率最高,最快,而在40～50%的含水土壤中发芽率反而下降。牛繁缕、稗草等湿生杂草种子能在10～50%的含水土壤中发芽,以15～30%的含水土壤中发芽率最高,发芽最快,在40%以上的含水土壤中反而发芽率略低,发芽势慢。更多还原

【Abstract】 The germination of weed seeds was effeeted by the soil moisture and temperature. The seeds of Monochoria vaginalis,Echinochloa crusgalli,Cyperus difformis,and Setaria viridis were sown in the glass dishes with the soil.The moisture content of the soil in the glass dishes was adjusted in series of 20,30,40,50,and 60% at the room temperature,the weed seedlings were counted after emerging.The seeds of M. vaginalis began to germinate in the soil with 30～40% moisture content,however, 50% moisture content favoured their germination. For S.viridis,Veronia persica,and Portulaca oleracea,the initial and best germination of their seeds occurred in the soil with 10～15%,and 15～30% moisture content,respectively,however,there was no good germination to be found in the soil with 40% moisture content. The seeds of E.crusgalli,Malachium aquaticurn initiated their germination in the soil with 10% moisture content,the best germination occurred as the soil moisture content was in the range from 15% to 30%,but there was the poor germination to be observed in the soil with 40～50% moisture content. When the moisture content in the soil is favourable,the seeds will germinate well and fast,for example,the seed of S.viridis from the plant to initiate germination in the soil with 10% moisture content took 14 days,if the moisture content in the soil increased to 20%,in the case,it took 5 day only.更多还原