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1.肥害死苗 旱地一般因持水量远远少于水田,故易造成秧苗肥害。一是苗床施用未充分腐熟的农家肥,因发酵发热和氨气造成死苗。二是肥料与土壤翻拌不匀,肥料未均匀散开,没有与土壤充分融合。秧苗一叶一心后,秧根下扎触及肥团,而造成反渗透死苗。三是出苗后根际追施尿素又未及时浇足水,因缩二脲、氨和肥液浓度过大而引起秧苗成片死亡。因此一定要提高苗床质量,不施用未充分腐熟的农家肥。施肥后要充分翻拌土壤,使肥与土充分拌匀融合,出苗后只进行叶面追肥,不进行根际追肥。
1. Fat dead seedlings Dry land generally due to water capacity is far less than paddy fields, it is easy to cause seedling fertilizer damage. First, the application of seedbed is not fully decomposed farmyard manure, ammonia fermentation caused by fever and dead seedlings. The second is uneven fertilizer and soil mixing, fertilizer spread unevenly, not fully integrated with the soil. After a seedling leaves one heart, the roots under the bar and touch the fat group, resulting in reverse osmosis dead seedlings. Third, after the emergence of rhizosphere topdressing urea has not yet timely enough water, biuret, ammonia and fertilizer concentration is too large and cause seedlings die. Therefore, we must improve the quality of seedbed, do not apply not fully decomposed farmyard manure. After fertilization to fully mix the soil, so that fertilizer and soil fully mix well, only after the emergence of foliage fertilizer, do not top dressing.