According to the research of the accumulation of dry matter and carbon-nitrogen metabolism which are affected by the ratio between basal fertilizer and top-dressing, the results show that, 1.

通过对不同基追肥比例对烤烟干物质累积和碳氮代谢的影响研究，结果表明：1。

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Appling molybdenum fertilizer could remarkably reduce accumulation of nitrate in lettuce and you-mai vegetable no matter which pattern of fertilization, basal-dressing and top-dressing.

无论是作底肥还是作追肥，施用钼肥均能显著抑制莴苣、油麦菜的硝酸盐积累。

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In this study, the influences of different nitrogen fertilizer variety, nitrogen level and basal manure on nitrate accumulation and quality of cabbage were investigated in field experiments.

本文在田间试验条件下探讨了氮肥品种、用量及不同基肥种类对包心菜硝酸盐累积及品质的影响。

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