一.前言上海市郊栽培秋萵苣虽然已有20—30年的历史,部分农民也具有着丰富的栽培经验,但由於未给予总结与推广,故目前仅在大场、真如、龙华等区的少数乡中有实验的农民才有栽培。在1955年3月召开的上海市郊农业生产劳动模范大会上,劳动模范王林祥介绍了应用播前低 I. Preface Although cultivation of autumn lettuce in the suburbs of Shanghai has a history of 20-30 years, some peasants also have rich experience in cultivation. However, since they have not been summed up and popularized, only the minority Experimental farmers in the village have cultivated. In March 1955 in Shanghai suburban agricultural production model workers meeting, the model worker Wang Linxiang introduced the application of low before sowing