论文部分内容阅读
上世纪90年代至今,我国许多地区推广免(少) 耕技术。该技术可以解决滥耕滥种的难题,还可以节省能源。但连续多年实行这一技术,弊病凸显,生产上应予以重视。 1 免(少)耕的弊病(植保方向) 一是杂草成灾。由于免(少)耕,田间杂草种子不被掩埋,使得杂草数量和种类越来越多。数量常是作物苗数的几倍甚至几十倍(重草麦田杂草1万株/m2)。若是麦田套种稻,则稻田生长前期水、旱两类草共生.种类多达几十种。
Since the 90s of last century, in many areas of our country, free (less) farming techniques have been promoted. This technology can solve the problem of overbeding and also save energy. However, the continuous implementation of this technology for many years has highlighted the shortcomings and should be given due attention in production. 1 Free (less) shortcomings of farming (plant protection direction) First, weeds disaster. Due to no (less) plowing, field weed seeds are not buried, making more and more weeds. The number is often the number of crop seedlings several times or even several times (heavy grass wheat weeds 10,000 / m2). If wheat interplanting rice, paddy field early growth of water, drought two types of grass symbiotic species up to dozens of species.