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对叶菜类硝酸盐积累的研究表明,硝酸盐积累与施肥量、光照强度关系密切,增施NO_3-N易增加蔬菜植株中硝酸盐的含量,尤以遮光条件下更为显著。供试蔬菜硝酸盐积累的绝对量是茼蒿>菠菜>小白菜>莴苣。增施钼肥,不论遮光与否,均可减少硝酸盐在叶菜中的积累,但品种间反应略有差异。试验还显示了硝酸盐积累较多的叶菜,还原糖含量相应下降。就还原糖积累而言,未遮光区远高于遮光区。氨基酸的分析表明,无钼区较之高钼区游离氨基酸的积累增多。证明光照和钼的存在,是NO_3-N正常代谢所必不可少的因素。对亚硝酸盐也进行了检测,但所有试验均未测出。
Nitrate accumulation in leafy vegetables showed that the accumulation of nitrate was closely related to the amount of fertilizer applied and the light intensity. NO3-N increased nitrate content in vegetable plants, especially under shading conditions. The absolute amount of nitrate accumulation in vegetables tested was Artemisia selengensis> spinach> cabbage> lettuce. Adding molybdenum fertilizer can reduce the accumulation of nitrate in leafy vegetables, no matter whether it is shading or not, but there is a slight difference between varieties. The experiment also showed that the leafy vegetables with more nitrate accumulation decreased the content of reducing sugar. As for the accumulation of reducing sugars, the un-shading area is much higher than the shading area. Analysis of amino acids showed that the accumulation of free amino acids in the molybdenum-free zone was higher than that in the high-molybdenum zone. Prove the existence of light and molybdenum, NO_3-N is an essential factor in the normal metabolism. Nitrite was also tested, but none of the tests were detected.