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植物激素是植物生长的调节剂,各种激素对植物生长发育有各种不同的调节作用。同时,不同的浓度对植物生长起不同的作用。最适浓度能促进生长,超过最适浓度却抑制生长,浓度过高则破坏正常生长甚至杀死植物。现在有个别育苗户,滥用植物生长激素。用赤霉素(九二○)喷洒幼苗,促使幼苗高生长(为达到一级苗以上目的),致使苗木柔软、细长、木质化程度差,降低了苗木的抗寒、
Plant hormones are plant growth regulator, a variety of hormones on plant growth and development have a variety of different regulatory role. At the same time, different concentrations have different effects on plant growth. Optimum concentration can promote growth, inhibit the growth of more than the optimal concentration, the concentration is too high to undermine the normal growth or even kill plants. Now there are individual nurseries, abuse of plant growth hormone. Seedling with gibberellin (Jiuzuo), to promote seedling growth (in order to achieve the purpose of a seedling above), resulting in soft, slender seedlings, the degree of lignification, reducing seedlings cold,