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开原县古城堡公社是个黄土丘陵地区,全社耕地39,000亩,大多是高低不平的坡地,平地较少。每年种植大豆12,000～13,000亩。1970年以前,以清种为主,实行高粱、谷子——大豆——玉米的三年轮作制。粮豆获得均衡增产。1970年,粮谷平均亩产488斤,大豆亩产250斤。1971年开始推广粮豆窄挡间种,一般为2∶2、3∶2、4∶2间种形式。该年粮豆间种面积占50%左右,当年收成较好,粮谷平均亩产432斤,大豆亩产210
Kaiyuan County Ancient Castle Commune is a loess hilly region, the whole village 39000 acres of arable land, mostly rugged slopes, less land. Planting 12,000 to 13,000 acres of soybean each year. Prior to 1970, the priority was given to purebreds, which implemented the three-year rotation of sorghum, millet-soybean-corn. Balanced production of grain beans. In 1970, the average grain yield 488 kg, 250 kg of soybean per mu. 1971 began to promote grain beans narrow block between species, usually 2: 2, 3: 2, 4: 2 intercropping forms. The year grain beans accounted for about 50% of the area, when the harvest is better, average grain yield 432 pounds, 210 acres of soybean per mu