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甘薯大垄双行套种大豆效益高１９９２年卢龙县大李佃子乡示范推广了甘薯大高整栽双行，垄沟内套种大豆的立体种植模式，获得平均亩产鲜薯１９６０．８公斤，比单一种植甘薯增产１７％，多得大豆７５．９８公斤的高效益，受到群众欢迎，至１９９４年全乡已推广到３２００亩...
Sweet potato big ridge double line intercropping soybean high efficiency 1992 Lulong County Dalai Zidi Township Demonstration Popularize the sweet potato tall double planting line, furrow interplanted soybean three-dimensional planting pattern, access to an average of 1,680.8 kilograms of fresh produce per mu than a single Planting sweet potato yield 17%, more than soybean 75.98 kilograms of high efficiency, welcomed by the masses, to the township in 1994 has been extended to 3200 acres ...