耕翻对稗草、马唐、苋菜三种杂草的防治机理研究

从1994年～1996年的三年时间内,在北京中国农业大学科学园研究了耕翻对稗草、马唐、苋菜三处杂草在耕地中的防治机理。用标记种子确证了稗草、马唐、苋菜三种杂种子在耕层受耕翻作用后移动特点,测定了这三种杂草种子在耕地地表的平面移动距离和耕层30cm 处停留2年后的活力。结果表明耕翻使杂草种了上下双向移动,向下移动的远大于向上移动的量。在耕层底部的杂草易失活力。耕翻对稗草、马唐、苋菜三种杂草籽在耕地中的防治机理是:耕翻使这三种杂草种子在耕地土壤中移动,部分移动至地表,半年后移动3m 或离开地块;部分移动至耕层底部,不能出苗,逐渐丧失活力。后者作用大于前者。

Effects of Ploughing on Controlling Redroot,Amaranth and Common Crabgrass Barnyardgrass

Experiments were carried out from 1994 to 1996 to study controlling effects of ploughing on redroot amaranth(Amaranthus retroflexus),common crabgrass(Digitaria sanguinalis)and barnyardgrass(Echinochloa crus-galli).The results showed that plough- ing made seeds of these three weed species to move upward or downward in the cultivated soil layer.The amount of moving seeds was larger downward than upward.The seeds on soil surface could move more than 3 m far away by winds.The weeds moved down to the bottom of t...