植烟土壤碱解氮、速效钾含量及其交互作用对烤烟钾含量的影响

以曲靖罗平烟区为基础,分析了土壤碱解氮、速效钾及其交互作用对烤烟钾含量的影响,结果表明:(1)罗平烟区土壤碱解氮含量较高,有56.13%的土壤样品碱解氮含量处于高水平(150 mg/kg);土壤速效钾含量丰富,但变异系数(49.22%)较大;烟叶钾含量较适宜,有77.61%的烟叶样本达到巴西优质烤烟钾含量标准。(2)随着土壤碱解氮含量的增加,烟叶钾含量先升高,随后又降低;烟叶钾含量(y)与土壤速效钾含量(x)呈显著正相关(P0.05),回归方程y=0.000 4 x+1.885达到显著水平。(3)方差分析结果显示:氮钾交互作用对烟叶钾含量的影响达到极显著水平(P0.01)。当土壤基础肥力处于低氮、中氮水平时,烟叶钾含量与土壤钾水平呈正相关;当土壤基础肥力处于高氮水平时,二者表现为负相关。在9种土壤氮钾互作组合水平中,以中氮高钾(N2K3)组合的烤烟钾含量最高。

Effect of Available Nitrogen and Available Potassium Concentration,and Their Interaction on the Potassium Content in Flue-cured Tobacco Leaves

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.