Management of lettuce in winter greenhouse

First, the temperature and humidity management should be paid attention to ventilation and dehumidification at the initial stage of planting. When the temperature is above 0 °C, the wind should be released. When the temperature is below 0 °C, cover the small arch shed and cover the straw curtain; When the stem begins to expand until the harvest, the shed temperature is 15-20 °C during the day, more than 24 °C ventilation, and no less than 5 °C at night.

Second, the fertilizer and water management should be planted with sufficient root water after planting, 5-6 days after the seedlings are slowed down, the seedling water is poured, and the seedling fertilizer is added with water, and the ammonium sulfate is applied for 10-15 kg, and then the continuous cultivation of the loose soil is 2-3. Times. When starting the group, the soil will be topdressed once with water, and 20 kg of ammonium sulfate will be applied in the mu, and then the cultivating and seedlings will continue. When the stem begins to expand, water it in time, and chase the ternary compound fertilizer 25-30 kg with the water. The soil should be kept moist after this time.

Third, the disease prevention and treatment early stage with 25% metalaxyl manganese zinc wettable powder 800-900 times liquid and 50% speed Keling wettable powder 1500 times liquid, or with 50% carbendazim suspension 500-600 times liquid Mix 2-3 times (spray once every 7 days).

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