Watermelon has strict requirements for cornices, topography, and soil quality. It is necessary to pay attention to reasonable land selection before planting watermelon.
1. Choose mouthwash. Watermelon has strict requirements on the crops of the previous crop. It is necessary to pay attention to reasonable crop rotation and avoid continuous cropping. For the watermelons, it is best to harvest cereals such as wheat, corn, and sorghum which were harvested earlier and have a longer period of relaxation. Then, cotton and sweet potatoes are used. The selection of soybeans and peanuts should not be used to plant watermelons. According to the survey, the occurrence of watermelon wilt disease in the soybean meal plots is the heaviest, the diseased plant rate is as high as 45%, the corn stubble plot is lighter, and the diseased planting rate is about 20%.
2. Choose the terrain. Watermelon is drought-tolerant, bogey-fighting, and afraid of earthworms. Planting watermelons should choose land plots with high topography, dryness, flatness, and easy drainage.
3. Choose the soil. Although watermelon has a wide adaptability to soil, it can grow in sandy soil, clay, paddy soil, red loam soil, freshly-prepared raw soil, and new cofferdam's beach soil. It grows well in PH5-PH7 soil, and contains salt. No more than 0.2% saline soil can also grow normally. However, the root system of watermelon has obvious permeability, and it is best to use the deep, fertile, loose loam or sandy loam soil for production.
4. Choose neighbors. Watermelon mosaic disease is one of the main diseases of watermelon. Its source of poison mainly comes from the early occurrence of summer squash and melon. Therefore, it is best not to plant watermelons adjacent to these two crops.
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