一是制钵时过量掺入尿素、碳铵、磷钾肥或未腐熟的人畜粪尿,肥、土未经充分搅拌混合堆积发酵腐熟,因而引起肥害烧芽,造成烂籽烂芽死苗。二是播种时没有将钵土充分渗湿润透,盖土过干,播后7～10天不见出苗。之后揭膜补充浇水时,原萌发的种子已烧芽、炕芽,少部分勉强破土出苗者,种 First, the system bowl excessive incorporation of urea, ammonium bicarbonate, phosphorus and potassium or not decomposed human and animal manure urine, fertilizer, soil without mixing well mixed fermentation maturity, resulting in fat burning fat bud, causing rotten rotten seedlings. Second, the soil is not fully sowing Moisturizing see through soil, covering the soil over dry, 7 to 10 days after sowing no seeming. After the opening to add watering, the original germination of the seeds have been burning buds, kang buds, a small part of barely emerged seedlings, species