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作 者 ：董晓英1;2;李式军2

期 刊 ：植物营养与肥料学报 2003年 9卷 4期 页码：447-451

关键词：小白菜；硝酸盐积累；渗调离子；溶液培养；

Keywords:nitrate accumulation, pakchoi, osmoregulation ion, before harvest, solution culture,

摘 要 ：开展了在采收前减少小白菜营养液中的氮量或在去除硝态氮的基础上加入渗调离子以试图降低小白菜的硝酸盐积累的试验。结果表明,在去除营养液中的硝态氮后,在营养液中加入Cl^-、SO₄^2-、苹果酸根离子、山梨酸根离子、乙酸根离子是降低溶液培养小白菜硝酸盐积累的有效措施,但处理后采收的时间不可推迟太久。而只减少营养液中氮肥用量会使产量迅速下降,硝酸盐含量降低却缓慢,加入渗调离子可缓解因去除氮肥引起的小白菜产量的下降。

Abstract:The paper aimed to reduce nitrate accumulation of pakchoi under solution culture by regulating nutrient during the short period just before harvest. The regulating methods are as follows: reducing N content in nutrient, replacing NO₃^- with NH₄⁺; eliminating N completely from Nutrient; and using Cl^- and SO₄^2- as osmoregulation substituting NO₃^-. All these resulted in lower nitrate content in pakchoi, the experiment also showed adding Cl^- and SO₄^2- basing on reducing N amount had better effect on reducing nitrate accumulation of pakchoi, the effect of Cl^- was better than SO₄^2-. However, the treatments of eliminating N completely and adding organic acid salt reduced nitrate content significantly and also decreased pakchoi yield.

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