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从问题的描述看,估计是盆土通透性不好、积水造成的。这样根系呼吸不畅,引起生理性干旱,致使根系腐烂。如改用通透性强、保肥好并经充分腐熟的培养土栽培,即可解决。
From the description of the problem, it is estimated that the Pentu permeability is not good, caused by water. This root respiratory failure, causing physiological drought, resulting in root decay. If the switch to strong permeability, good fertilizer and fully cultivated soil culture, can be solved.