烤烟不同生育期的钾素营养对烟叶产量和含钾量的影响

采用砂培法模拟烤烟不同生育期的钾素营养对其产量和质量的影响。结果表明,烟叶产量与烤烟生育前、中期供钾量呈极显著正相关;烟叶含钾量与烤烟生育中、后期供钾量是极显著正相关,并建立了逐步回归模型;通径分析发现,烤烟生育中期供钾强烈影响烟叶产量和含钾量,生育前期供钾主要对烟叶产量有一定作用,而对烟叶含钾量影响较小;生育后期供钾主要影响烟叶含钾量,而对烟叶产量作用较小。本文首次提出生育后期充足供钾对提高烟叶含钾量作用极大,提倡钾肥分次施用,为钾肥的经济有效施用提供了理论依据。 

Studies on the Effects of Potassium Nutrient in Different Stages of Growth on the Leaf Yield and Quality of Flue-cured Tobacco

The studies on the effects of potassium nutrient in different stages of growth on leafyield and quality of flue-cured tobacco were conducted by way of sand culture. The results demonstrated that tobacco leaf yields was significantly correlated with K application in early and mid stages, while K content in leaf was significantly correlated with Kapplication in later stage of growth. The results of path analyses showed that K application in mid stage had strong effect on the leaf yield and leaf K content, K application inearly stage had certain effect on leaf yield and less effect on leaf K level, while K application in later stage had certain effect on the leaf k level and less effect on the leaf yield.The paper also pointed out that K application in later stage of growth is very importantto increase the leaf K content, and split application of K fertilizer was also suggested.