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1.徒长苗。表现为叶大而薄,茎秆纤细,节间长,根系弱,根毛少。产生原因主要是光照不足,夜温过高,密度过大,浇水过多,偏重施氮肥。预防措施:及早分苗,扩大营养面积,增加光照,保证夜温低些,控制浇水,配方施肥,喷施矮壮素或缩节胺。 2.僵化苗。表现为植株矮小,叶片短小,节间密集,茎秆硬化而细。产生原因主要是低温、干旱、施肥不足,土壤板结,蹲苗时间过长。预防措施:适时间苗,适度炼苗,蹲苗时控温不控水,投足肥料。依长势喷施赤霉素或细胞分裂素。 3.沤根苗。表现为地下根系变
1. Only long Miao. The performance of large and thin leaves, stems slender, internode, weak roots, root hair less. The main causes are inadequate lighting, night temperature is too high, too much density, excessive watering, emphasis on nitrogen fertilizer. Preventive measures: early sub-Miao, expand the area of nutrition, increase light, to ensure that the night temperature is lower, control of watering, formula fertilization, spraying chlorin or shrink amine. 2 rigid seedlings. The performance of plants dwarf, short leaves, internodes dense, stems harden and fine. The main causes are low temperature, drought, inadequate fertilization, soil compaction, squatting time is too long. Preventive measures: appropriate time seedlings, moderate hardening, squatting seedlings when the temperature control water, enough fertilizer. Gibberellin or cytokinin according to the growth of spray. 3. 沤 root seedlings. The performance of underground roots change