| 摘要: |
| 采用对比试验的方法,对海藻提取物对菠菜硝酸盐积累的影响及机理进行了研究。结果表明:在300 kg/hm2的氮肥施用量下,用不同浓度的海藻提取物喷施菠菜叶片,均显著降低硝酸盐含量,且浓度与硝酸盐含量呈极显著的负相关;海藻提取物对菠菜硝酸盐含量不存在稀释作用,并且对土壤硝化细菌数量无明显影响;浓度与硝酸还原酶活性呈极显著的正相关,说明海藻提取物降低菠菜硝酸盐含量的机理是通过增强硝酸 还原酶活性来实现的。 |
| 关键词: 海藻提取物 菠菜 硝酸盐 机理 |
| DOI： |
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| 基金项目:国家863计划项目(2004AA620530) |
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| Effect of seaweed extract on nitrate accumulation in spinach and its mechanism |
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| Abstract: |
| Using comparable experiments, the effect and mechanism of seaweed extract on nitrate accumulation in spinach were studied, the results showed that under the condition of 300 kg/hm2 of N-utilizing, when spraying different concentrations of seaweed extract to spinach leaves, every treatment of seaweed extract concentration may dramatically decrease nitrate content, and the relation between concentration and nitrate content showed an extremely significant level; there did not exist dilution effect, and seaweed extract didn’t clearly influence the number of nitro bacteria; the relationship between concentration and NRA dramatically becoms close, and shows the mechanism of seaweed extracts decreasing nitrate content was realized through enhancing NRA activity. |
| Key words: seaweed extract spinach nitrate mechanism |
