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实践证明,塑膜覆盖玉米苗期田间杂草发生有下列特点:1 覆膜玉米田杂草发生危害与露地不同露地玉米苗期的草害常可结合农事活动得以控制;但在停止中耕后,遇秋雨季节还会出现草荒,所以基本上足前轻后重。覆膜玉米田苗期草害由于膜内温度高、湿度大,适宜杂草滋生。杂草出苗早、生长快、数量大,且处于膜下,不便铲除,玉米苗期株体小,水分、肥分、光线等易被杂草所掠夺,所以危害重。到玉米生长后期,太阳辐射强烈,膜内温度急骤升高,杂草会被自然烫死或烫伤;同时,玉米株体增大,对杂草又有一定抑制作用,后期即使雨量再大也不会出现草荒,基本上是前重后轻。据我们在不同生态条件下草情调查,覆膜田杂草每亩平均543000
Practice has proved that plastic film cover corn seedling field weeds have the following characteristics: 1 covered cornfield weed hazards and exposed to different field corn seedling grass can often be combined with agricultural activities can be controlled; but after stopping farming, When the rainy season there will be a shortage of grass, so basically enough light weight before. Laminated corn field seedling damage due to the membrane temperature, humidity, suitable for breeding weeds. Weeds early, fast growth, large number, and under the film, inconvenient to eradicate, corn seedling plant small, water, fertilizer, light and other vulnerable to weeds by plundering, so endangering heavy. To the late corn growth, strong solar radiation, the film suddenly increased temperature, weeds will be naturally burned or scalded; the same time, corn plants increased, but also have some inhibition of weeds, later even if the rainfall is no longer big There will be grassland shortage, basically before the light weight. According to our investigation of the grass under different ecological conditions, the average per mu of covered weeds was 543,000