镁、锌、硼肥对烤烟几个生理生化指标、产量和品质的影响

 1987～1989年,在缺乏和比较缺乏镁、锌、硼的土壤上所作的田间试验结果表明,合理施用这些肥料,能提高烤烟的叶绿素含量、硝酸还原酶活性,有提高光合强度的趋势。结果还表明,施用镁、锌、硼肥能提高烟叶的百叶重、产量、上中等烟(尤其是上等烟)比例和亩产值,烟叶内在化学成分达到或接近国内要求,尤其能提高烟碱含量。经济效益分析表明,合理施用镁、锌、硼肥是提高烤烟品质和经济收益的一项农业技术措施。

Effects of Mg, Zn and B Fertilizers on Some Physiological Biochemical Indices, Yield and Quality of Flue-cured Tobacco

In field trials in 1987～1989, effects of Mg,Zn,B fertilizers on some physiological biochemical indices, yield and quality of flue-cured tobacco were investigated in 3 soils that were deficit of availale Mg, Zn and B. The results obtained are summarized as follows: 1. Mg, Zn and B fertilization increased the chlorophyll contents, tended to arise the photosynthetic intensity and elevated nitrate reducfase activity of leaves at various stages. 2. Root development of flue-cured tobacco plants were promoted by Mg, Zn and B supply, So that absorbability for nutrients increased, it was beneficial for the increasing yields and quality of cured leaves. Experiment results showed that 100 leaves weight raised, average yields in 3 years increased 8.03～11.05%, elevated high and middle grade ratio of cured leaves, return per mu increased 12.28～14.90%. 3. In the treatments with Mg, Zn and B fertilizers, the quality of cured leaves improved, increased total nicotine contents by 0.42～0.45%.