Potatoes will rot and wither near the soil.

1, potato chips can be put into net bags or sacks for temporary storage after cutting, mixing and drying, but the stacking should not be too high or too dense, and the height should not exceed1.5m. There should be a certain gap between bags. Cut potatoes according to the weather and cover them in time in case of rain. If the seeds cannot be sown in time under special circumstances, the cut potato pieces should be piled up in time to avoid the phenomenon of rotten potatoes caused by long storage time.

Too big a potato can easily cause too many pieces-injury-rot or plant weakness.

2. Potatoes are not tolerant to waterlogging. Excessive waterlogging or humidity will lead to hypoxia in the underground part of plants, resulting in poor root growth and limited root activity. In the late growth stage, the lenticels on the surface of tuber are opened, and pathogenic bacteria such as bacteria and fungi invade, which leads to the tuber's intolerance to storage, easy to get sick and rot, high yield and poor harvest.

3. Foggy weather is beneficial to the occurrence and prevalence of potato late blight. Once the weather forecast is foggy, you can burn wood and smoke on the plot before it starts to fog, so as to eliminate the fog and reduce the impact of the fog on potatoes. Timely spraying pesticides such as hunting cream and kelu to control late blight.

4. Sowing too deep-the ground temperature is low and slow when seedlings emerge, and the Rhizoctonia canker is serious, which is not conducive to harvest-the excavator is heavily loaded.

Sowing too shallow-when the soil is shallow, seedlings will emerge quickly, tubers will be green and stolons will grow out of the ground easily.

5. The potato plants in the field are short and stiff, with yellow leaves and curly leaflets; In the late stage of the disease, the stem base turned black and rotted, and the plant died. The tubers of diseased plants first turn black and rot from stolons, and then develop inward to turn the heart black and form a black heart. Under humid conditions, the course of disease will soon lead to overall decay and odor, which is caused by potato black shank disease. Potato chips with mild illness will continue to rot during storage and give off an unpleasant smell.

For black heart disease caused by black shank disease, when cutting seed potatoes, strictly remove the diseased potatoes to prevent them from falling to the ground; The knife for cutting diseased potatoes should be soaked and disinfected with potassium permanganate solution to avoid spreading pathogenic bacteria and expanding the incidence rate; Find the diseased plants in the field as soon as possible, pull them out and clean them up, and destroy them outside the field.

To sum up, potato is planted in Gao Shuang, with deep soil layer, loose and fertile soil, rich organic matter, waterlogging drainage, dry irrigation and neutral or slightly acidic light sandy soil. Light sand and fertile soil are important conditions to ensure potato root development and tuber expansion. Potato is cultivated in light sandy soil, which has the advantages of quick germination, neat emergence, vigorous plant growth, large, smooth and beautiful potato and good quality. Poor drainage and ventilation in low-lying land, waterlogged wetland and clay affect root growth, which is not conducive to tuber expansion and the yield is obviously reduced. Under rainy and humid conditions, diseases occur seriously, and rotten seeds and potatoes are easy to occur. If planted in alkaline soil, tubers are easy to scab. Potato planting should not be replanted, nor should it be planted on the plot with eggplant (tomato, eggplant and pepper) or cabbage and cabbage as in the previous crop to prevent the occurrence of * * * diseases.