关键词: 烤烟, 罗平烟区, 碱解氮, 速效钾, 钾含量

Abstract: Taking Luopin tobacco-growing area in Qujing city as basis, this paper analyzed the effect of soil available nitrogen, available potassium and their interaction on the potassium content in flue-cured tobacco leaves. The results indicated that: ① the soil available nitrogen content in Luopin tobacco-growing area was higher, and 56.13% of the soil sample were at a high level(>150 mg/kg). Soil available potassium content was rich, but the coefficient of variation was larger(49.22%). The potassium content in flue-cured tobacco leaves was appropriate, and about 77.61% tobacco samples reached the potassium levels of Brazil high quality flue-cured tobacco. ② Along with the increasing of soil available nitrogen content, the potassium content in flue-cured tobacco leaves increased first and then decreased. The potassium content(y) in flue-cured tobacco leaves was positively correlated (P<0.05) with soil available potassium content(x). And the regression equation, y=0.000 4 x+1.885, reaching a significant difference. ③ The variance analysis results showed that the effect of interaction between N and K on the potassium content in flue-cured tobacco leaves reached extreme significant difference at P<0.01 level. When the soil basic fertility was at low nitrogen and medium nitrogen level, the potassium content in flue-cured tobacco leaves was positively correlated with soil potassium level. When the soil basic fertility was at high nitrogen level, the correlation were negative. Among 9 soil nitrogen and potassium interaction groups, medium nitrogen and high potassium（N2K3）group could produce flue-cured tobacco leaves with the highest potassium content.

Key words: flue-cured tobacco, Luopin tobacco-growing area, available nitrogen, available potassium, potassium content