烤烟轮作、连作对烟叶产量质量的影响

Effect of rotational cropping and continuous cropping on yield and quality of flue-cured tobacco

烤烟连作、轮作的4年定位比较试验结果表明:连作烟株的田间长相长势、产量、产值、外观质量均低于轮作;连作的产量仅有轮作的59.12％;产值仅有轮作的29.93％;中上等烟比例仅有轮作的52.07％;均价仅有50.6％。烟叶的致香物质检测结果表明:轮作烟叶中致香物质含量大多数高于连作烟叶。连作与轮作土壤养分对比结果表明:连作田土壤中的有效磷和有效钾含量明显地高于轮作田;轮作土壤的pH值、有机质、全钾、速效硼、速效锌、CEC、交换性镁均高于连作。连作与轮作土壤中微生物总量差异不明显。与轮作相比,烤烟连作后黑胫病和赤星病的发病率升高。

Results of four years' crop rotation and continuous cropping location experiment of flue-cured tobacco showed that growth potential, yield, value of yield .average price and apparent quality of continuous cropping tobacco was worse than that of crop rotation tobacco. The percentage of yield, value of yield, average price and mid-higher grade tobacco of continuous croppingtobacco to crop rotation tobacco was 59.12%, 29.93%, 52.07%,50.6%, respectively. Results of aroma chemicals detecting showed that amount of aroma chemicals in rotation cropping tobacco was higher than that of crop continuous tobacco. Results of comparison of soil nutrients under two cropping system showed that content of available phosphorate and available potassium in the soil of continuous cropping was higher than that in the soil of crop rotadon. But the pH, content of organic matter, total potassium, available P, available Zn, CEC and changeable Mg in soil of crop rotation was higher than that soil of continuous cropping. The difference of total microbe amount in soils of two cropping system was not significant Compared to crop rotadon system, the disease percentage of tobacco black shank and tobacco brown spot increased after continuous cropping.