【摘要】 氮肥形态及施用方式的盆栽试验研究表明 ,石灰性土壤上施用硝态氮肥菠菜生长量大 ,硝态氮累积量低 ;大量的铵态氮肥对菠菜的生长有明显的抑制作用 ;施用铵态氮肥可造成菠菜对氮素的吸收、利用滞后 ;硝态氮肥基施和适当推迟采收时间都能有效减少菠菜体中的硝态氮累积量。因此应以施用硝态氮肥为主 ,同时配合少量铵态氮肥 ,并结合重基施轻追肥、适当延长采收期 ,不仅能够获得高产 ,而且还能明显减少硝态氮累积量。更多还原

【Abstract】 Pot experiments was carried out for studying the effect of different nitrogen fertilizer forms and application methods on growth and nitrate accumulation of spinach. The results showed that applying NO 3 --N in the limy soil had made spinach growth better and had lower nitrate content, applying NH 4 +-N had made spinach absorption and use nitrogen time postpone and significantly restrained the spinach growth. NO 3 --N was used base dressing and delaying sample all can significantly decrease nitrate accumulation amount. After of all, in order to obtain high yield and decrease nitrate content of foliage vegetables, it was important that NO 3 --N was mainly selected in nitrogen forms, base dressing was used in application method and harvest time was appropriately postponed.更多还原