Effects of Planting Density and Nitrogen Rate on Yield and Characters of Flue-cured Tobacco Planted in Purple Soil in Jiangxi Province

In order to identify the relationship of planting pattern and the quality of strong aroma type tobacco in purple soil of Jiangxi province, a field experiment with a widely planted tobacco variety K326 in Jiangxi was conducted to study the effects of planting density and nitrogen rate on characteristics of tobacco in purple soil in Jiangxi. The results showed that as the nitrogen rate increased, the plant height, the leaf width and the ratio of fresh leaf weight to dry leaf weight increased significantly, while the ratio of leaf length to leaf width obviously decreased. When the nitrogen rate was less than 142.5 kg/ha, the less the plant spacing, the wider the leaf, higher density could increase tobacco yield, while thin planting significantly increased the percentage of high-quality tobacco leaf when the nitrogen application rate was more than 142.5 kg/ha. When the nitrogen application rate was 165 kg/ha, thin planting was greatly in favor of increasing the leaf length and leaf width and the percentage of high-quality tobacco leaf. When the plant spacing was 0.5 m and the nitrogen rate was 165 kg/ha, it could obtain the highest yield and economic benefit of tobacco. So it is suggested that the purple soil tobacco planting mode was row spacing 1.2 m, plant spacing 0.5 m and nitrogen application rate 165 kg/ha.