四,植物激素在现代农业生产上的应用当人工合成的植物生长激素问世以后,植物激素才开始从科学家的实验室迈向田间试验。在此同时人们还发现一直被作为除草剂使用的2、4D,在低浓度时与植物激素有相类似的作用。这样植物生长调节素在现代农业中的应用就很自然地拓展开来,至今已经形成一个新的领域,归纳起来可以分以下二个方面。 (一)人工合成的植物生长调节素在农业上的应用。首先人们发现2、4D等植物生长调节剂 Fourth, the application of plant hormones in modern agricultural production After the advent of synthetic plant growth hormone, plant hormones began to move from scientists’ laboratories to field trials. At the same time, it has also been found that 2,4D, which has been used as a herbicide, has a similar effect with plant hormones at low concentrations. In this way, the application of plant auxin in modern agriculture is naturally expanded. So far, a new field has been formed and the following two aspects can be summed up. (A) the application of synthetic plant auxin in agriculture. First, people found 2,4D and other plant growth regulators