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采用盆栽试验探讨了钾、尿素与有机物料或双氰胺配施对菠菜体内硝酸盐、亚硝酸盐累积量及与其相关的硝酸还原酶(NR)活性的影响。结果表明,菠菜体内硝酸盐含量的顺序为:尿素>尿素+鸭粪>尿素+猪粪>尿素+双氰胺; 亚硝酸含量顺序为:尿素>尿素与鸭粪配施>尿素与双氰胺配施>尿素与猪粪配施。有机物料的加入均可明显地增加植株体内NR的活性,在菠菜体内NR活性以:尿素+鸭粪>尿素+猪粪>尿素+双氰胺>尿素处理。在相同的氮肥处理条件下,配施适量的钾肥也能显著地降低菠菜体内硝酸盐、亚硝酸盐的累积和增加NR的活性。随着追肥时间的延长,菠菜体内的硝酸盐、亚硝酸盐含量也随之降低,特别是NR的活性在追肥后的第12天到18天之间有显著的降低过程。
The effects of potassium, urea and organic materials or dicyandiamide on the accumulation of nitrate and nitrite in spinach and the nitrate reductase (NR) activity related thereto were investigated by pot experiment. The results showed that the sequence of nitrate content in spinach was: urea> urea + duck excrement> urea + pig excrement> urea + dicyandiamide; the order of nitrite content was: urea> urea and duck manure> urea and dicyandiamide With facilities> urea and pig manure facilities. The addition of organic materials can significantly increase the activity of plant NR, the NR activity in spinach body: urea + duck manure> urea + pig manure> urea + dicyandiamide> urea treatment. Under the same conditions of nitrogenous fertilizer, the application of appropriate amount of potash fertilizer also significantly reduced the accumulation of nitrate and nitrite in spinach and increased the activity of NR. With the extension of dressing time, the content of nitrate and nitrite in spinach decreased, especially the activity of NR decreased significantly from the 12th day to the 18th day after dressing.