Field management method of winter strawberry in greenhouse

From late September to early October, winter strawberries can be covered with plastic film from late September to early October. Besides the double covering of greenhouse and small arch shed, leaf cover and other heat preservation measures can also be adopted.

After temperature and humidity management, 25 ℃ ~ 30 ℃ in daytime and 12 ℃ ~ 17 ℃ at night are required in the early stage after planting, which is beneficial to early flowering and fruiting. Results the greenhouse temperature was no more than 20 ℃ ~ 25 ℃ in daytime and no less than 5 ℃ at night (the target of temperature control was 10 ℃). The relative humidity should be about 50%, and the humidity should be adjusted by ventilation.

Topdressing grasps the principle of frequent application of thin fertilizer, generally using 0.5% compound fertilizer, applying light fertilizer once after planting live trees, topdressing once again in about 20 days of harvest, and 0.2% potassium dihydrogen phosphate plus 0.4% urea for external topdressing.

Artificial pollination in winter there is no insect pollination in the greenhouse, in order to avoid the occurrence of deformed fruit, artificial pollination should be carried out. At 8: 9 am every morning, smearing flowers with a brush or cotton ball has a significant effect on increasing yield and good fruit rate.

Botrytis cinerea is easy to occur in the prevention and control of diseases and insect pests in low-temperature and humid weather. 50% Sukeling powder 1000-1500 times spray has a good effect, and it can also be fumigated with Yishuanling No. 1 (Chlorothalonil smoke Agent) and Yishuanling No. 2 (Shukeling smoke Agent). Or with chlorothalonil, carbendazim and other control, the effect is also very good.

Spraying gibberellin on the first heart leaf and spraying 10 ml / kg gibberellin each when 2-3 and 4-5 true leaves were sprayed could greatly increase the yield and improve the fruit quality.

During the treatment of blooming and fruiting, the light bulb is used to make up the light, and the light is prolonged for 2 hours every day, which is beneficial to early flowering and early fruiting (a 45-60 watt light bulb is set up every 1 meter in the greenhouse). At the same time of replenishing light, the minimum temperature in the shed can be maintained at about 5 ℃, so that the temperature changes smoothly and the harvest time can be advanced by about 20 days.