【作者】 陈军；

【导师】 颜合洪； 赵松义；

【作者基本信息】 湖南农业大学 ， 种植， 2003， 硕士

【摘要】 地膜覆盖栽培技术在烟草上的应用始于1950年代，国内外有不少对此项技术的研究，普遍认为：地膜覆盖栽培在烟叶生产上发挥了积极作用，即提高地温、保蓄水土、保持和提高土壤肥力，减少养份流失，达到促进烟株早发，提高产、质量的目的。本试验探讨了在不同施N水平下，地膜覆盖不同期限对烤烟生长发育、养分吸收、品质、产量和产值的影响，结果表明：地膜覆盖栽培烤烟有利于烟叶面积的增长，促进烟株干物质的积累，干物质每日积累高峰比无覆盖处理提前10d，团棵期揭膜有利于调节和改善中后期烟株生长状况；促进烟株早期养分吸收积累，提高N肥利用率，调节烟叶化学成分，改善烟叶品质，保证烟叶充分成熟，烟叶上等烟比例比无覆盖处理提高了4-7个百分点，显著提高产量和产值，经济效益明显。更多还原

【Abstract】 The technique of ground plastic-covering on tobacco began to apply in the 1950 s. There are many investigations based on this technique by China and foreign countries1 scientists. Generally speaking, the technique of plastic covering plays an important role in tobacco production, such as improving soil temperature, water and soil conservation, maintaining and advancing soil fertilization, reducing nutrition runoff. Ground plastic covering can promote tobacco developing earlier and advance the tobacco quality and yield. According to this experiment we investigated the effect of different periods of ground plastic covering with different N levels on the tobacco growth development, nutrient absorption, quality, output and production value. The main results are as follows: The results show that ground plastic covering is helpful to the growth of flue-cured tobacco leaf area and the accumulation of dried matter in the stems. The daily accumulation peak in dry matter appeared ten days earlier than the tobacco seedling uncovered. It was suggested that uncovering ground plastic in extending-root stage could regulate and improve tobacco growth during the period of middle and late stages. The technique of ground plastic covering can promote nutrient absorption in the early stage, which can advance nitrogen-use efficiency and regulate the chemistry components in the tobacco leafs. So the quality of tobacco leaf was improved. When the leafs matured enough, percentage of prime tobacco leaf was increased by 4-7 percent, which can improve the output and production value significantly.更多还原