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种子发芽后,要及时揭去覆盖物。有60%-70%的种子在子叶展开后应将膜揭去,以免幼苗徒长。仍然要保持基质的湿度,从而使未发芽的部分种子的子叶从种壳中成功伸出。
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草花根腐病 的防治
侵染早,植株生长受阻或是根系短或是带有不易看清的黑头。根上存着黑点,看起来象根系被灼烧过的样子。后来生长的根系表现良好,可能是植物抗病的结果。
病因:腐霉菌通过土壤侵染根系,这种菌可在任何土壤中发现并很难控制。品种不同,租摆草花,侵染程度不同。土壤蒸气消毒后立即种植,早期侵染的危害甚大,因为此时,土壤中的竞争性生物尚未复原。
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