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莴苣是人们喜食的蔬菜之一,在我国栽培普遍,尤其是冬春莴苣面积较大。一般生产上,冬春莴苣实行秋播,具4—5片真叶时定植越冬,次年春抽生茎并膨大而形成产品,长江中下游地区一般要到4月中下旬才大量上市。所以不仅生产周期长,上市迟,且效益低。为了改善莴苣的生长环境,缩短生长周期,达到提早上市、高产优质、高效的目的,对冬春莴苣进行覆盖栽培是一项行之有效的措施,并已有报道。但目前冬春莴苣覆盖栽培面积仍较少,且形式各异,高产高效创收的效果亦千差万别。本试验的目的在于研究各种覆盖形式的温度效应及对莴苣生育和产量的影响,为制定冬春莴苣的高产高效栽培措施提供理论依据。
Lettuce is one of the vegetables that people like to eat. It is widely cultivated in our country, especially the winter lettuce area is larger. In general production, winter spring lettuce autumn planting, with 4-5 true leaves when planting winter, the next spring pumping stems and swollen to form a product, the middle and lower reaches of the Yangtze River generally until late April before a large number of listed. So not only long production cycle, late listing, and low efficiency. In order to improve the growth environment of lettuce, shorten the growth cycle, and achieve the purpose of early listing, high yield, high quality and high efficiency, covering cultivation of winter spring lettuce is an effective measure and has been reported. However, the coverage of winter lettuce cultivation area is still less, and different forms, high yield and efficiency of income generation also vary widely. The purpose of this experiment is to study the temperature effects of various forms of covering and the effect on the fertility and yield of lettuce, and to provide a theoretical basis for the development of high yield and efficient cultivation measures of winter spring lettuce.