Water chestnut is generally planted in wet mudlands in temperate climates, such as ponds and swamps. The climate should not be too cold, and the best temperature is between 25 degrees Celsius and 36 degrees Celsius. The water depth must be 60 cm.

1. Selection of varieties

Selecting high-quality water chestnut varieties is the basis for high yields and the key to competing for the season, occupying the market early, and improving economic benefits. If raw food is the main food, early and medium-ripening varieties with large water chestnuts (two-cornered water chestnuts) can be selected and put on the market in batches. Mainly for high yield, the Wuling variety with late maturity period can be planted. At the same time, because water chestnut species are prone to degradation, care must be taken to select water chestnut seeds with full rhombus shapes, high solidity, fully hardened peel, and no pests and diseases.

2. Timely and dense planting

The appropriate time for local water chestnut planting is generally before and after Qingming Festival, when the water temperature is stable above 12℃. The methods can be divided into two types: direct seeding and seedling transplanting. . Live broadcast is suitable for river ponds with water depths of 2-3m and fertile subsoil. When the water chestnut germs grow 1-2cm, scatter the water chestnut seeds evenly in the water. Before sowing, pay attention to clearing aquatic plants, moss and wild water chestnuts in the river pond. The seed amount per mu is generally 10kg. For river ponds with poor fertility, the seed amount can be increased appropriately. For river ponds with large water surfaces and deep water, seedling transplanting can be used. Choose a river pond with fertile bottom soil and shallow water. Before sowing, put dry water to dry the topsoil, and apply enough farmyard manure as base fertilizer. After sowing, put shallow water in, and then gradually deepen the water layer as the seedling age increases. The amount of seeds per mu is about 60kg. , can be transplanted into 5-6 acres of water surface. The seedlings are about 60 days old, have 10 top leaves, have a rhombus disk of 15cm, and have 2 to 3 branches. When stocking, tie 10 plants into a bunch with a straw rope and gradually insert them into the bottom of the water. If the density of water chestnuts is too high after the water chestnuts grow out of the water, artificial thinning and even seedlings can be used to prevent the water chestnuts from sealing the water surface early and causing a small opening, which affects the yield.

3. Lingtang management

① Apply sufficient base fertilizer. As an aquatic vegetable, water chestnut needs fertilizer differently from xerophytic crops, and the amount of fertilizer required is relatively concentrated. Before planting, 2000kg of pig manure or decomposed mud manure can be applied per mu. When the water chestnuts sprout, 5kg of urea can be applied per mu as a quick-acting fertilizer. After flowering, it can be divided into 2 to 3 times in combination with 2 to 3 packets of powerful yield-increasing fertilizer for disease and insect control or 2% Potassium dihydrogen phosphate is sprayed on the leaves to prevent premature aging.

②Pest control and weeding. Common insect pests of water chestnuts include aphids, leafhoppers, etc. In the early stage of the damage, 90% crystal trichlorfon 800 times solution or 5-6 bottles of trichlorfon mixed with 50kg of water can be sprayed with a small machine. Spray once every 10 days. The use of highly toxic pesticides such as methamidophos is strictly prohibited to reduce the risk of damage. Residual poison prevents water chestnut deformity or empty shells. The common disease of water chestnut is mainly water chestnut plague, which causes leaf rot. In the early stage of the disease, 400g of 5% Jinggangmycin plus 200g of carbendazim mixed with 50kg of water can be sprayed with a small machine. Master the prevention and control of diseases and pests 3 to 4 times in a lifetime. In ponds where water chestnuts are stocked, there are many types of aquatic weeds, including deep-water ichthyosaurs, shallow-water green duckweeds, plantain grasses, centipede grasses, moss grasses, etc. They must be removed manually in time, otherwise the photosynthesis of water chestnuts will be affected. Generally, after the water chestnuts are put in, weeds should be removed every 10 days until the water chestnuts cover the water surface.

4. Timely harvesting

The harvesting principle must be market-oriented and focus on improving economic benefits. Harvesting should be carried out in stages according to the maturity period of varieties and different uses. Water chestnuts begin to mature 20-30 days after flowering. The maturity period of our early-maturing varieties is from August 15th to 20th, and the late-maturing varieties are in late September and early October. If used as vegetables or eaten raw, it can be best harvested when the sepals fall off and the peel is not fully hardened. If they are to be eaten cooked, processed or kept as seeds, they must be picked when fully mature. Early-maturing varieties are picked every 5 days, late-maturing varieties are picked every 7 days, and the entire harvest period is divided into 6 to 7 times. When harvesting, be careful to lift the water chestnut plates and pick the water chestnuts gently, and lay them flat after harvesting to avoid damage. If you want to save water chestnuts for seed, wash them in water in time after harvesting to remove the floating tender water chestnuts. After that, replace the water every 10-15 days to ensure the germination rate of water chestnuts in the coming year.