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１ 前 言 景宁县外舍乡油田村在调整种植结构，大力发展效益农业的过程中，积极探索城郊型农业的新路子。采用“早熟马铃薯─西瓜─杂交稻─冬菜” 四熟种植模式，取得了良好的经济效益和社会效益。该种植模式是中低海拔地区效益农业发展，提高单位面积产量，增加经济收益的一
1 Introduction Jingning County, She Sheung Sheung Sheung Sheung Tsuen in the adjustment of planting structure, to develop effective agriculture in the process, and actively explore new ways of suburban agriculture. Adopting the “ripe potato - watermelon ─ hybrid rice ─ winter vegetables” four-cropping mode, and achieved good economic and social benefits. The cropping pattern is beneficial agricultural development in low and middle altitude regions, raising yield per unit area and increasing economic returns