氮水平和硝态氮比例对烤烟新品种05氮肥效应的影响

Effects of Nitrogen Application Rate and Nitrate Nitrogen Ratio on Nitrogen Fertilizer Availability of New Flue-cured Tobacco Variety YH05

为促进烤烟新品种05的推广应用,采用田间小区试验,研究不同的施N水平(不施肥、N 5 g/株、N 7 g/株、N 9 g/株)和N素形态比例对YH05的N素吸收利用以及产值量的影响。结果表明,N水平、NO3--N比例以及二者之间的交互作用不仅影响烟株各部位N素的含量,而且对吸收的N素在烟株各部位的分配率也有影响。N水平是影响05 N肥农学利用率的主要因素,YH05 N肥表观利用率的影响因素包括N水平、NO3--N比例以及N水平和NO3--N比例的交互作用。N水平、NO3--N比例以及二者之间的交互作用对YH05的农艺性状和经济性状的影响有差异。综合考虑农艺性状、经济性状和N肥效应等因素,在试验区域内,确定YH05的最适施N水平为N 7 g/株,NO3--N比例为25%。

To promote the commercial application dissemination of new flue-cured tobacco variety YH05, the effects of nitrogen application rates and different nitrogen form ratios （NO3--N） on the availability of nitrogen fertilizer, growth, yield and production value of YH05 were investigated by the methods of field experiment. The results showed that nitrogen application rate, different nitrogen form ratios and the interaction between the two factors not only affected nitrogen contents, but also affected nitrogen absorption and transport. Nitrogen application rate was the main influential factor on nitrogen agronomic efficiency, while apparent efficiency of nitrogen was affected by nitrogen application rate, different nitrogen forms ratio and the interaction. The three factors affected agronomic and economic characters differently. The results suggested that the optimal nitrogen application rate of YH05 was 7 g of per tobacco plant and 25% of nitrate nitrogen ratio when considering agronomic characters, economic characters and nitrogen fertilizer availability.