According to the research of the accumulation of dry matter and carbon-nitrogen metabolism which are affected by the ratio between basalfertilizer 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。
2
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。
3
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.