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过去,我区种植红薯的旱地绝大多数只种红薯一种,不套种其他作物。自1978年旱地种植制度改革以后,红薯地套种绿豆这种方式在全区迅速推广,面积逐年扩大,红薯、绿豆的产量也逐年提高。1982年全区红薯地套种绿豆的面积达到25万余亩,占全区红薯总面积的89.6％,绿豆总产880万斤,比上一年增长五倍。红薯总产折稻谷1.3亿斤,比上一年增长8.9％。红薯套种绿豆的好处,归纳起来有以下几点:
In the past, most of the dry land where sweet potatoes were planted in our district were only sweet potatoes, but not other crops. Since the reform of the system of dry land cultivation in 1978, the method of intercropping green beans in sweet potato fields has been rapidly promoted in the whole region, and the area has been expanded year by year. The output of sweet potatoes and mung beans has also been increased year by year. In 1982, the area of intercropped sweet potato intercropped with mung bean reached more than 250,000 mu, accounting for 89.6% of the total area of sweet potato in the region and the total output of mung bean was 8,800,000 kg, an increase of five times over the previous year. The total output of sweet potato 130 million kg of rice, an increase of 8.9% over the previous year. The benefits of potato intercropping mung bean, summed up the following points: