Detailed Explanation of the "Four Prevention" Management Methods for Greenhouse Flowers

First, prevent "freezing". For flowers that are not cold-tolerant, straw curtains should be added at night or a small inner tunnel should be built inside the greenhouse; a water storage pool can also be dug every few meters in the center of the greenhouse to use the pool for heat preservation; or some plant ash can be scattered on the ground, which generally can raise the ground temperature by 1°C-2°C.

Second, prevent "dampness". During long periods of sealing and when there are many rainy and snowy days, drainage ditches should be dug outside the greenhouse to reduce soil moisture. In addition, some plant ash can be scattered on the pot surface or the ground to absorb heat and increase temperature and absorb moisture and reduce humidity. At the same time, attention should be paid to keeping the greenhouse film taut to strictly prevent water accumulation and leakage on the roof of the greenhouse.

Third, prevent "gas". Fully decomposed organic fertilizer should be applied in the greenhouse, and the application amount of chemical fertilizer should be reduced as much as possible. On sunny and windless days, ventilation should be carried out in time to discharge harmful gases from the greenhouse.

Fourth, prevent "disease". The air humidity in the greenhouse is high, so special attention should be paid to preventing the occurrence of diseases such as powdery mildew, black spot, and anthracnose. For anthracnose, spraying 75% chlorothalonil 500-times solution at the early stage of the disease can be used for prevention and control; for powdery mildew, spraying 1:1:140 equal-strength Bordeaux mixture can be used for prevention and control; for black spot, spraying 70% thiophanate-methyl 1000-times solution can be used for prevention and control. When using pesticides in the greenhouse, avoid the high-temperature period at noon on sunny days and the flowering period.