1, broken membrane seedlings: sowing to the emergence of pre-emergence due to impenetrable to increase the temperature, is conducive to the unearthing of seedlings, 20-30 days after sowing, until the emergence rate of more than 50%, should be promptly broken membrane seedlings. 2. After emergence: The small greenhouse covered with three membranes should be opened when the daytime temperature reaches 15°C. When the temperature in the large shed is reduced to 15°C, the small arched membrane should be covered with insulation. When the weather becomes warmer and the temperature can stabilize at more than 15°C in the morning at 7:00 in the morning, the film can be removed. If cold weather is encountered in the growing season, weeds should be placed on the outside of the greenhouse. During the middle and early stages of potato growth, the daytime temperature in the shed is controlled at 16-22°C, and the nighttime temperature should be controlled at about 12°C. During the middle and late stages of potato growth, the daytime temperature in the shed is controlled at 22-28°C, and the nighttime temperature is controlled at 16-18°C. To achieve 28 °C to release the wind cooling. 3. Fertilizer and water management: (1) Applying base fertilizer requires 5.5 kg of pure nitrogen (hydrolysis N), 2.2 kg of pure phosphate fertilizer (effective P2O5), and 0.5 kg of pure potassium fertilizer (quick effect K2O), based on the amount of fertilizer required for producing 1,000 kg of potatoes. To achieve 2000-3000 kilograms per mu, adopting organic fertilizer + compound fertilizer + fertilizer partner or three guarantees or potato special golden ground Kangxi Shi best, organic fertilizer can be chicken manure, 2-4 m square amount of consumption, can also use other farms Fertilizer, mu dosage 5-8 square. The compound fertilizer is preferably of high potassium type. The amount of mu is two bags (100 kg). If it is not of high potassium type, about 25 kg of potassium sulfate should be added. The fertilizer partner's mu dosage is 20-40 kg, which is mixed with the compound fertilizer. When the organic fertilizer is insufficient, the dosage is more, 60 kg is better. If you directly sprinkle in the seeding ditch, you can use less. (2) Spreading 100-300 kilograms of dry manure with potato high-yielding conditioner 2 kilograms or strong 2 kilograms in the sowing trench. Fertilizer partners or potato high-yielding conditioners or strong fertilizers can be used without applying any trace fertilizer. The base fertilizer is sufficient, no fertilizer is required during growth, and the soil is kept moist during the middle and late growth period. From the early flowering stage to the late flowering stage, water the soil 2-3 times according to the soil moisture. Stop watering 7 days before harvest to facilitate storage. 4. Cultivated soil: The tubers of potatoes are formed by the extreme shortening and expansion of the internodes of the underground stolons. The formation of the stolons and the enlargement of the tubers are closely related to the depth of sowing, the thickness of the cover soil, and the timeliness of soil cultivation. Seeding is too shallow or the soil is too thin. When the stems are exposed on the ground, the stems on the ground will grow to form branches, which means the ground will not be exposed. It will also affect the potato enlargement when the temperature of potatoes is too high. Therefore, potatoes should be properly planted and soiled several times. 5. Foliar fertilizers and growth conditioners: Potatoes require more P and K fertilizers during the budding and flowering stages. This stage can be used for multiple spraying of organic potassium dihydrogen phosphate or potassium kalium. If the plant has a phenomenon of leggy and the height is more than 60 cm, it can be used to control the growth of vegetative growth of the plant. Generally, it can increase production by about 10%.
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Field management technical points of greenhouse potato