| 蕹菜的氮素、钼矿质元素营养与硝酸盐积累 |
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| 引用本文： | 张勇,唐树梅,孙桂芳,阮云泽. 蕹菜的氮素、钼矿质元素营养与硝酸盐积累[J]. 热带作物学报, 2004, 25(1): 68-72 |
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| 作者姓名： | 张勇 唐树梅 孙桂芳 阮云泽 |
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| 作者单位： | 1. 华南热带农业大学农学院,海南,571737
2. 中国农业科学院土壤肥料研究所,北京,100081 |
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| 基金项目： | 海南省自然科学基金资助项目(编号:30106)，中国农业科学院土壤肥料研究所农业部植物营养学重点开放实验室开放基金课题项目资助。 |
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| 摘 要： | 采用不同质量比的氮源、氮胁迫和不同钼质量浓度的营养液栽培方法,探讨其对蕹菜(IpomoeaaquaticaForsk)的生长和体内硝酸还原酶(NR)活性的影响,揭示蕹菜体内硝酸盐积累的规律。结果表明:以NO3-为单一氮源不仅会导致蕹菜NO3-严重积累,也会使产量偏低;而以NH4 为单一氮源,蕹菜则不能正常生长;蕹菜在收获前10 d停止供氮可以降低蔬菜中NO3-含量;随着钼质量浓度的增加硝酸还原酶活性呈上升趋势,但当钼质量浓度>0.378mgL时,硝酸还原酶活性则会降低,只有适当的钼浓度才可以降低蕹菜的NO3-含量。
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| 关 键 词： | 蕹菜 氮素 钼 矿质元素 营养水平 硝酸盐积累 |
| 修稿时间： | 2003-05-31 |
Effect of Nitrogen and Molybdenum Nutrition on Nitrate Accumulation in Swamp Cabbage |
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| Zhang Yong Tang Shumei Sun Guifang. Effect of Nitrogen and Molybdenum Nutrition on Nitrate Accumulation in Swamp Cabbage[J]. Chinese Journal of Tropical Crops, 2004, 25(1): 68-72 |
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| Authors: | Zhang Yong Tang Shumei Sun Guifang |
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| Affiliation: | Zhang Yong1 Tang Shumei1 Sun Guifang2 |
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| Abstract: | In order to study the regularity of nitrate accumulation and the activity of nitrate reductase in swamp cabbage, hydroponics experiments were conducted with different ratios of NO3--N to NH4 -N and molybdenum levels respectively. The results showed that applying NO3- as the unique N source resulted in serious nitrate accumulation and lower crop yield. The nitrate content in swamp cabbage was decreased when N supply was stopped ten days before harvest. Supply of appropriate concentration of molybdenum could also decrease the nitrate content in the crop. |
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| Keywords: | nitrate accumulation nitrogen source molybdenum level |
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