盆栽条件下水氮耦合对烤烟光合特性及产量的影响研究

Effects of water and nitrogen coupling on photosynthesis characteristics and yield of flue-cured tobacco based on a pot experiment

在防雨棚中对烤烟新品种遵烟6号进行盆栽实验,研究了各生育阶段内不同土壤水分下限控制指标与施氮量组合对烟叶光合特性和产量的影响。试验结果表明,随着灌水量或施氮量的增加,烤烟的光合作用及产量均呈先升高后降低的趋势,烤烟伸根期、旺长期及成熟期的土壤水分控制下限指标(占田持的百分数)分别为50%,90%和70%及总施氮量为5.5g/株的处理,光合作用指标最为适宜,烟叶产量为最高,是最优的水氮耦合处理。

Based on a pot experiment conducted on the new variety named Zunyi Tobacco 6 in rain-proof shed, we analyzed the effects on photosynthetic characteristics and yield of flue-cured tobacco from different combinations of moisture and nitrogen application amount at different growth stages. The results indicated that the photosynthesis and yield both increased at first and then decreased as water irrigation and nitrogen application amount increased. When the lower limit （percentage of farmland water content） of the relative soil water content at the root extending stage, the vigorous growing stage and the maturing stage was respectively 50%, 90% and 70%, and the nitrogen application amount was 5.Sg/plant, the combination of water and nitrogen was optimal with the most appropriate photosynthesis and highest yield of flue- cured tobacco.