Potato management at the seedling stage is critical. The main measures are:
1. Timely soil preservation seedlings. Most of the potato field soil is yellow loam soil, large soil particles, poor water holding capacity, and rapid evaporation of soil moisture. At present, the dry soil layer is 10 to 15 centimeters, while the potato seed potato is about 10 centimeters in size and will be affected by drought after emergence. For such seedlings, the seedlings should be ploughed in shallow soil in a timely manner, cover the soil layer thickly, cut off the soil capillary, slow the evaporation rate of water, extend the survival time of the seedlings, and try to preserve the seedlings. Coverage time is controlled at 30% bud top soil.
2. Timely fertilization to promote strong seedlings. There are some nocturnal soils in high altitude areas, which are mostly of loam type, with small soil particles and strong soil water retention capacity. At present, soil moisture content is better. After the emergence of such plots, about 10 kilograms of urea should be topdressed, and the seedlings should be quickly raised to ensure strong seedlings. The fertilization method is applied to the seedlings and then cultivating the soil.
3. Foliar spraying anti-transpiration agent. After fully spreading the potato leaves, the anti-transpiration agent can be used for foliar spraying. Anti-transpiration agent can form a protective film on the surface of the blade to slow the evaporation of water. Anti-transpiration agent can use sodium bisulfite, humic acid, calcium chloride, fulvic acid (FA), triadimefon, crown ether, etc., according to the product instructions.
4. Check seedlings to replant. For plots with less than 30% seedlings, crops such as early-mature corn and cowpea can be planted. Through intercropping between local crops, land use efficiency can be improved, losses can be reduced, and profits can be increased. If there is effective rainfall soon after emergence, it can also be cut from the underside of the axillary branches of the normal potato plants on rainy days to reduce seedling deficiency.
5. Underground pest control. Potatoes are vulnerable to underground pests after sowing and at the seedling stage, causing bad seeds and seedlings. Therefore, it is necessary to formulate plans for the prevention and control of underground pests. The underground pests are mainly ground tigers. For under 3 instar tigers, 40% phoxim 800 times or 2.5% deltamethrin EC can be sprayed.
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