玉米田的杂草危害是造成玉米减产的重要因素之一,其中马唐、早稗、鳢肠、藜、凹头苋、空心莲子草、双穗雀稗等对玉米危害尤大。据试验,每平方米20株马唐或20株旱稗,可使青玉米产量损失分别达9.7％和15％左右。近年来,随着农业结构的调整,从事农业的劳动力甚为紧张,为了解决玉米田的草害,提高玉米的产量,促进畜牧业的发展,从1980年始,作者选用了10多种除草剂,进行玉米田杂草防除技术的研究。现将结果报道如下。 (一)不同除草剂的除草活性 The weed damage in corn field is one of the important factors to reduce corn yield. Crabgrass, barnyardgrass, colon, pigweed, Amaranthus retroflexus, Alternanthera philoxeroides and Paspalum are particularly harmful to corn. According to the test, 20 crabgrass per square meter or 20 dry barnyardgrass can make the yield loss of green corn reach 9.7% and 15% respectively. In recent years, with the adjustment of agricultural structure, the labor force engaged in agriculture is very tense. In order to solve the grassland damage in maize field, increase the yield of maize and promote the development of animal husbandry, from 1980 onward, the author selected more than 10 herbicides, Weed corn field weed control technology research. The results are reported below. (A) herbicidal activity of different herbicides