桂阳烤烟田间不同栽培方式土壤速效养分动态变化

【研究目的】为了探明烤烟最佳栽培方式，明确不同栽培条件下土壤速效养分的变化动态差异，【方法】采用大田试验，对露地、地膜覆盖、稻草覆盖三种栽培方式下的土壤速效养分含量进行测定。【结果】结果表明：露地栽培符合烤烟的吸肥规律，但由于气温、水分等原因土壤养分含量较低；地膜覆盖碱解氮含量呈先降低后升高的趋势，与烤烟对氮素的吸收规律不符；覆盖稻草可以提高土壤养分含量，在烟株进入成熟期碱解氮含量呈平稳的下降趋势。【结论】虽然覆盖稻草有利于优质烤烟的生产，但还需要加强一些有效的栽培调控措施，使稻草覆盖成为优质烤烟生产更有利的栽培方式。

Dynamic Change of Soil Available Nutrient under Different Cultivation way in field of Flu-cured Tobacco in Guiyang

OBJECTIVE]In order to study the best cultivation way of Flue-cured tobacco ,and show dynamic changes of soil available nutrient under different cultivation, according to the field experientMETHOD]the content of soil available nutrient under three treatments of natural planting, plastic mulching and straw mulching were studied in this paper. The result showed that the contents of soil available nutrients of natural planting were low becauses of temperature ,water and so on, but it accorded with the absorbing nutrient ruleRESULTS]The content of hydrolytic N of plastic mulching decreased after increased, and it disagreed with the absorbing N rule. Straw mulching could improve the contents of soil available nutrientsCONCLUSION]The content of hydrolytic N decreased smoothly after mature period. Although straw mulching was help to produce good quality Flue-cured tobacco,it should reinforce some effecttive cultivated adjustment research in order to make straw mulching become the best cultivation way to produce good quality Flue-cured tobacco.