广东省-中国科学院全面战略合作项目 (2011B090300100)；中国烟草专卖局（公司）重大专项（110201101001TS-01）； 广东省烟草专卖局科技项目； 川渝中烟工业有限责任公司项目
A field experiment was carried out to investigate the effects of planting density and N application on the yield, photosynthetic characteristics and enzyme activities of tobacco. The results showed that: 1) Planting density and N had a positive interaction with shoot biomass; 2) Planting density, N and planting density×N had no effects on chlorophyll a,chlorophyll b and carotenoids content. Photosynthetic rate had no difference between high and medium density, which was higher than that of low density. Under the condition of high density, the photosynthetic rate of high N was higher than that of medium and low N treatment. Under the condition of medium density, photosynthetic rate at medium N had no difference compared with that at either low or high N. Photosynthetic rate at high N was higher than that at medium N, and photosynthetic rate at low N had no difference with that at medium or high N. Under the condition of low density, photosynthetic rate at high N was lower than that at low N, but photosynthetic rate at medium N had no difference compared with that at either low or high N; 3) Planting density and N had a significant impact on nitrate reductase activities and amylase activities at growing and maturing stages.
刘朝科,王 军,谢玉华,陈永明,顾学文,王 佩,丁效东.种植密度与施氮量对烤烟光合特性及代谢酶活性的影响[J].华南农业大学学报,2013,34(4):458-464复制