论文部分内容阅读
二甲四氯(2—甲基—4—氯苯氧乙酸)为苯氧羧酸类化合物,是一种激素型除草剂。工业上制成的二甲四氯钠盐为黑褐色粉末,有酚的嗅味,极易溶于水,存放时易吸潮结块,但不变质,不影响药效。对人畜及鱼类毒性小,对植物有强烈的生理活性。在一定条件下,二甲四氯有高度选择性除草作用。在低浓度时则表现有刺激作用,可用来防止落花、落果,形成无子果实,促进果实成熟,促进插枝生根等;在浓度增高时,则破坏植物新陈代谢过程,产生抑制和毒害作用。对禾本科作物如稻、麦等,除幼芽,拔节、孕穗,抽穗四个时期外,其他时期,在施药4—5天内有一定的抑制作用,6—7天后则转为促进生长的作用。
Dimethyltetrachloro (2-methyl-4-chlorophenoxyacetic acid) is a phenoxycarboxylic acid compound, which is a hormone-type herbicide. Industrial made of dimethyl tetrachloro sodium salt is dark brown powder, smell of phenol, easily soluble in water, easy to absorb when stored caking, but not degenerate, does not affect the efficacy. Toxicity to humans and animals and fish is low, the plant has a strong physiological activity. Under certain conditions, MCPA has a highly selective herbicidal effect. At low concentrations, it has a stimulating effect, which can be used to prevent flowerless and deciduous fruits, to form non-fruit fruits, to promote fruit ripening, and to promote rooting of cuttings. When the concentration is increased, the metabolic process of plants is disrupted, resulting in inhibition and poisoning effects. Grasses such as rice, wheat, etc., in addition to sprouts, jointing, booting, heading four periods, the other period, 4-5 days in the application of certain inhibitory effect, 6-7 days to promote growth effect.