西瓜的品种很多,按成熟期有早、中、晚熟之分,上市周期较长。西瓜是对温、光比较敏感的作物之一,西瓜生育期间处于光、热资源丰富的季节。然而,在西瓜茎蔓展开之前,田间裸露的面积很大,宜于杂草发生。如防除不力,常会出现“草荒猛如虎”的现象。草害既影响西瓜的产 Many varieties of watermelon, according to the maturity of early, middle and late maturity points, the listing cycle longer. Watermelon is one of the crops that are sensitive to temperature and light, and the watermelon is in a season of light and heat resources during its growth. However, before the watermelon stems and crannies spread out, the exposed area in the field is very large and is suitable for weeds. Such as poor control, often appear “grassland wild as tiger ” phenomenon. Grass damage affects both watermelon production