采用盆栽试验研究了饱和铵贮库施肥法(NDSA—Nitrogen depot with saturated ammonium)对芹菜(ApiumgraveolensL.)氮素吸收、产量和品质的影响。结果表明,与常规施肥法相比,NDSA施肥法或添加DCD(双氰胺)增加芹菜产量的效果并不明显,但两者配施(NDSA2-S处理)则可显著提高芹菜产量。常规施肥法(NDSA1-M)的氮肥表观利用率只有35.5%,NDSA施肥法和添加DCD均可显著增加芹菜对氮素的吸收,提高氮肥表观利用率;两者配施氮肥表观利用率可高达63%。NDSA施肥法可大幅降低芹菜的硝酸盐含量,而添加DCD的效果并不明显。施氮可明显增加芹菜的Vc含量,其中以NDSA施肥法配施DCD效果最好。芹菜叶片Vc含量很高,相当于茎中的10倍。施氮和NDSA施肥法对芹菜可溶性糖影响不大,但添加DCD可明显增加芹菜的可溶性糖含量。
In recent times, there are two kinds of completely opposite viewpoints about the impacts of nitrate on human health. To further objectively understand the effects of nitrate on human health, both of harmfulness and possible benefits of nitrate to human body, it is discussed in this review from the aspects of nitrate accumulation in vegetables, the source of nitrate ingested into human body, and the transformation of nitrate in human body, as well as the pathogenesis and physiological functions of nitrate metabolism.
