In 2009, Liandu District established rice and vegetable rotation cultivation demonstration sites in Bihu, Dagangtou, Gaoxi, Shuanghuang, Lixin, and Fengyuan, and promoted rice and vegetable rotation area of ​​10,000 in Bihu, a major producing area for vegetable production. More than one acre, of which, the vegetable production base of the agricultural cooperatives of agricultural cooperatives in the Liandu District has promoted a rice-vegetable crop rotation area of ​​more than 100 mu. At present, more than 100 acres of rice grow well in the cooperative base, some of which have been harvested, and the rest will be harvested in succession. It is estimated that the yield per mu will reach 550 kg or more, which is about 75 kg higher than that of conventional double-season rice cultivation.
Over the years, due to the constraints of arable land, a few years after continuous planting of many vegetable growing areas, vegetable dead seedlings, frozen seedlings, dead leaves, stem and leaf deformity and other phenomena have become more and more serious, a large number of application of chemical fertilizers, soil acidification, trace Lack of elements, serious soil-borne diseases, increased pesticide residues in vegetables, increased nitrate content, and secondary salinization under specific environmental conditions in sheds have exacerbated agro-environment, resulting in continuous cropping barriers for vegetables, especially for continuous cropping of vegetable facilities. It has become a major problem now, which has seriously affected the continuous development of the vegetable industry in Liandu.
"Rapeseed crop rotation" can increase soil organic matter and humus content and improve soil structure, so farmers no longer apply base fertilizer when planting rice, which saves fertilizer costs in rice production. At the same time, rice and vegetables belong to different genera. After rice is planted, it can inhibit the occurrence of various pests and weeds of vegetables, reduce the number of pests and diseases, reduce the occurrence of pests and diseases, and greatly reduce the investment in pesticides, reduce environmental pollution and labor, improve The production level of pollution-free vegetables is conducive to reducing the harm of soil salinization. The most important is that the rice-vegetable crop rotation has greatly eased the continuous cropping obstacles caused by continuous planting of vegetables, which is conducive to the high yield, high efficiency, and high quality of the vegetables produced by the sorghum and the sustainable development of the vegetable industry.
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