饱和铵贮库施肥法对芹菜氮素吸收、产量和品质的影响

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(Apium.graveolens.L.)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。

Effects of NDSA fertilization on the N uptake, yield and quality of celery

A pot experiment was carried out to study the effects of NDSA(nitrogen depot with saturated ammonium) fertilization on the N uptake,yield and quality of celery(Apium graveolens L.).The results showed that NDSA fertilization with addition of DCD could significantly increase the biomass of celery,while single NDSA fertilization or solo addition of DCD could not raise yield compared to conventional fertilization.Both NDSA fertilization and addition of DCD could significantly promote N uptake and increase apparent N recovery of celery.The effect was much more pronounced when NDSA fertilization cooperated with the addition of DCD,in which the apparent N recovery was 63%.NDSA fertilization could largely decrease nitrate content of celery,while DCD did not.N application could markedly increase Vc content in celery plant,which was more pronounced if NDSA fertilization cooperated with addition of DCD.The Vc stored in the leaf of celery was 10 times higher than that in the stem.Nitrogen application and NDSA fertilization had slightly effect on the soluble sugar content in celery,but DCD could significantly increase it.