不同腐殖酸用量对烤烟生长及产质的影响

2005年在昆明宜良做了不同腐殖酸用量对烤烟生长及产量品质影响的田间试验。试验结果表明施用一定量的腐殖酸能促进烟株生长和增加烟叶产量。在所有的处理中，产量提高最多的是施用腐殖酸8g/株，增幅15.8%，其次是施用12g/株，最低的是16g/株。对于烟叶产值和上中等烟比例，施用腐殖酸12g/株>16g/株>8 g /株>4 g /株>对照。尽管施用12g/株的产量和产值均不错，但烟叶中糖份和淀粉含量偏高，对品质不利；而增施腐殖酸到16g/株不但产量产值没有增加，反而降低了烟叶的质量。综合烟叶产量和品质，效果较好的是施用腐殖酸8g/株的处理。总之，施用腐殖酸能促进烟株生长和增加烟叶产量，但不是越多越好。

Effects of Humic Acid (HA) on Tobacco Growth and Yield and Quality

The field experiment was conducted in Yuliang County Kunming city in 2005.The results showed that HA promoted both the growth and yield of tobacco.The great yield was obtained at the 8g/plant HA rate,then followed by 12g/plant and the last one was 16g/plant.The leaf value and the ratio of up-middle grade was also increased and the order was 12g/plant >16g/plant >8g/plant >4g/CK.The 12g/plant HA rate got the good yield and value,but the content of sugar and starch was high in the leaf that was not good for the quality.The yield for the 16g/plant HA treatment was not increased any more whilst it decreased the leaf quality.For all aspects 8g/plant HA was recommended in the field.In summary,HA improved the tobacco growth and yield,but it not suggested that more HA means more better.