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How to prevent sweet potato rotting
In the sweet potato nursery, the rotting bed is mainly caused by: First, the disease is rotten, the seed potato has black spot, soft rot, stem nematode, or soil in bed with fertilizer. In addition, cold, hoe, and wound can also cause rot bed; Thermal injury, the bed temperature is above 40°C for a long time, it is prone to thermal injury, makes the seed potatoes soft, and when squeezing, it flows out of clean water and the body color is dark. Third, the water is rot or suffocate and lack of air, and the bed soil is tight and airtight or watered. Excessive or long-term airtightness after sealing the membrane causes anoxic rot beds. The methods of prevention and treatment are as follows. 1. Prevent disease from spreading. The seedbed should use pure soil and net manure that are free of pathogenic bacteria; strictly select disease-free seedlings that are not affected by chilling, stumbling, and breaking. Before the sweet potato goes to bed with 50% carbendazim powder 800 to 1000 times, it has good effect on the control of melasma; soaking with warm water of 51 ~ 54 °C for 10 minutes, not only has obvious control effect on melasma, It can also treat stem nematodes 0.5cm deep inside the potato skin. 2. Strictly control the bed temperature. From the seeding stage to the seedling stage, the bed temperature should be controlled at 31-35°C, and the maximum temperature should not be higher than 38°C. After the seedlings, the bed temperature of one angel rose to about 31°C, and then gradually increased. The bed temperature should be raised to about 35°C on the 5th day. After the high temperature germination, the temperature of the bed should be reduced to about 31°C. After emergence to hardening seedlings, bed temperature should be 28 ~ 25 °C. The seedlings are raised to the seedlings. The bed temperature is between 20 and 23°C. Pay attention to ventilation and cooling. 3. Control watering. Before the potato goes to bed, it should be poured with enough water. Generally, it is no longer watered in front of the buds, and it can be poured into small water in case of drought. The water can be poured once when the buds are arched to prevent the buds from wilting and drying to affect the growth of the seedlings. In the future, water is poured once every 5 to 6 days to keep the bed moist. Pour a large water 5 to 6 days before picking, then stop watering and carry out seedlings. Do not water on the day of seedling so as to facilitate wound healing of seed potatoes and prevent disease from spreading. Author: Promise County Agricultural Center the bottom Ma Guoqing Yu-juan