西藏东南山区烤烟氮磷钾肥施用效应研究

A Study on the Effect of N. P. K. Fertilization on the Virginia Tobacco in Southeast Tibet

本试验初步研究表明，在一定施肥量条件下，适宜的氮磷钾配比是决定西藏东南山区烤烟产、质量的关键因素。而土壤严重缺磷则是影响烤烟生产和施肥效果的主要限制因子。增施磷肥对于平衡施肥，促进烤烟对氮、钾的吸收，提高综合效益具有显著作用。

The mixed utllzation of nltrogen, phosphorus and potassium has an obvious effecton the production and quality of virgina tobacco in Southeast Tlbet. The averageproduction, production value, average price, and percentage of first-class tobacco arerespectively 81. 8%, 158. 8 %, 42. 3% and 175. 4% higher than the contrast which is notfertilization. The contents of nicotine, potassium, sugar and protein are also more thanthat of contrast. The study indicates that the absence of phosphorus in the soil is themajor limiting factor in tobacco production and fertilization efficiency. Utilization ofmore phosphorus plays an obvious role in balanced fertilization. promoting the, absorption of nitrogen and potassium and raising the overall efficiency. The best NPK ratio is1:3:2. Next is 1:5:3, 1:3:1. 3 and 1:2:2.