土壤氮磷钾肥量比对烤烟产量品质的影响

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

在有机质含量高达 5 8.2g/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N∶P2 O5∶K2 O =1∶1∶3处理为最高 ,较对照净增产值 35 6 3.5元 /hm2 ,为其它施肥处理的2 .1 2～ 2 9.

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 N∶P 2O 5∶K 2O=90∶90∶270 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.