施钙对烟叶拉断强度、拉伸强度的效应

 为了探讨钙对烟叶拉断强度、拉伸强度的效应，在丽江烟区开展了Ca(OH)2施用量0，150，750，1500，2000，2500kg/hm2对烟叶拉断强度、拉伸强度效应的试验。结果表明：（1）上部叶中处理6［Ca(OH)22500kg/hm2］的烟叶拉断强度最大为1.87N，中部叶中处理6的烟叶拉断强度最大为119N，下部叶中处理5［Ca(OH)22000kg/hm2］的烟叶拉断强度最大为1.14N。（2）上部叶中处理4［Ca(OH)21500Kg/hm2］的最大拉伸率最大为8.64%；中部叶中处理5［Ca(OH)22000kg/hm2］的最大拉伸率最大为6.07%；下部叶中处理5的最大拉伸率最大为4.78%。（3）拉断强度和拉伸强度均存在上部叶＞中部叶＞下部叶的关系，说明上部烟叶的弹性和抗破碎性最好，而下部烟叶最易破碎。

Effects of Ca on Flue cured Tobacco Leaf Draw and Tensile Strength

In order to find out effects of Ca on flue cured tobacco leaf draw and tensile strength, the usage of Ca(OH)2 0,150,750,1500,2000,2500kg/hm2 was set in Lijiang area. The results showed:(1) In upper leaves, the strongest effect of tobacco on draw strength with 1.87N was application of Ca(OH) 22500 kg/hm2; In central leaves, the best effect of tobacco draw strength with 1.19Nwas application of Ca(OH)22500kg/hm2; In the lower leaves, the best effect of tobacco draw strength with 1.14Nwas application of Ca(OH)22000kg/hm2.(2) In upper leaves, the best effect of tobacco tension strength with the 8.64% tension rate was application of Ca(OH)2 1500kg/hm2; In central leaves, the best effect of tobacco tension strength with the 607% tension rate was application of Ca(OH)2 2000kg/hm2; In the lower leaves, the best effect of tobacco tension strength with the 478% tension rate was application of Ca(OH)2 4.78% 2000kg/hm2.(3) For tobacco draw and tensile strength, upper leaves＞central leaves＞lower leaves. The best of elasticity and resistance was upper leaves, the worst was lower leaves.