土壤氮磷钾肥量比对烤烟产量品质的影响

在有机质含量高达 58．2g／kg 的土壤上进行烤烟施肥量比的田间试验结果表明，不同氮磷钾肥量比明显影响烟株长势，肥料用量与株高、茎围、有效叶片数和叶面积系数间呈极显著的二次曲线关系，而与节距和展开度呈直线型变化。施肥量比对烤烟叶片厚度、光泽、颜色、油润度等外观品质有明显影响，以增施钾肥提高烟叶商品性的作用最大。烤烟经济产量和产值均以 NP2O5K2O＝113 处理为最高，较对照净增产值 3563．5元／hm2，为其它施肥处理的2．12～29．1倍。

INFLUENCE OF DIFFERENT NPK FERTILIZER COMBINATIONS ON THE YIELD AND QUALITY OF TOBACCO IN HIGH ORGANIC - MATYER SOIL

A field experiment was carried out on a high organic - matter soil (O. M. being 58.2 g/kg ) to study the effects of different combinations of NPK fertilizers on tobacco. Fertilizer combinations showed a conspicuous effect on the growth vigor of the plants, and fertilizer rate appeared in a highly significant relationship of quadratic equation with plant height, girth, functional leaf number and LAI in a linear relationship with internode elongation and leaf angle. Fertilizer combinations had a marked influence on the sensory quality of tobacco, such as leaf thickness, glossiness, color and oiliness. Of the three fertilizers , potash had the greatest influence on the marketability of the tobacco leaf. The optimum fertilizer combination was NP2O5K2O = 9090270 kg/ha, which gave a net increase of 3563. 5 yuan (RMB)/ha in output value over the control, being 2.12 - 2.91 times as much as in the other fertilization treatments.