旱育秧一般适应力比水育秧强，但如果管理不当，则宜发生块块青枯。造成青枯原因是多方面的，主要是由于土壤因素、揭膜不当、管水不当等原因造成的。一、发生原因１．土壤因素土壤板结、土质粘重则在三叶期宜发生青枯。土质差，根系难以下扎，根系不发达，吸收土壤水分和养分 Drying seedlings generally adaptable than aquatic seedlings strong, but if not properly managed, the block should be withered. The cause of the scarcity is manifold, mainly due to factors such as soil factors, improper film exposures, improper water pipes and other causes. First, what happened? Soil factors Soil compaction, soil stickiness in the three-leaf stage should occur Qingruan. Poor soil quality, root system is difficult under the bar, underdeveloped root system, to absorb soil moisture and nutrients