氮素营养及磷钾比对白肋烟产质量影响的研究

 N,P,K是烟草生长的重要营养元素,其对产质量及效益的影响作用大小不同,本研究结果表明,产量随施N量的增加而增加,随K的增加呈下降趋势,3要素对产量的影响作用N＞K＞P;上中等烟比例随施P量增加呈下降趋势,施N以360 kg/hm²为高,施K以N∶K为1∶2的高,其影响作用P＞K＞N;均价随施P量增加有下降趋势,施N以360 kg/hm²为高,施K以N∶K为1∶2的最高;内外在品质以处理组合4最好。从优质、高效、低成本考虑,综合试验结果,以施N 300 kg/hm²,P₂O₅ 150～300 kg/hm²,K₂O 600 kg/hm²,N∶P₂O₅∶K₂O =1∶0.5～1∶2为最优组合。

Effect of Nutrition and P∶K Ratio on the Yield and Quality of Burley Tobacco

N, P and K are three important nutritive elements for tobacco growth and they have different effects on tobacco qualities and benefits. The experimental results on Burley tobacco showed that the yield was increased with the increase of N application and decreased with the increase of K application. The effects of three elements on yield were arranged in order of N＞K＞P. The ratio of high and moderate grade leaf and the average price were decreased with the increase of P application. Based on the consideration of good quality, high efficiecy, low cost and combined with the experimental results, the optimum combination is 300 kg／hm² for N, 150～300 kg／hm² for P₂O₅, 600 kg／hm² for K₂O and 1∶0.5～1∶2 for N∶P∶K ratio.