What should be noted when changing crops in winter greenhouses?

It is once again the peak season for changing crops in winter greenhouses. We remind vegetable growers not to cut corners for the sake of convenience and leave hidden disease risks for later. We suggest that vegetable growers pay attention to the following points when changing crops in winter greenhouses:

1. Deep plow the soil to improve the soil environment. Due to the growth of the previous crop of vegetables, the soil in the greenhouse has become compacted after watering and being trampled during operations, and its air permeability has become poor. If deep plowing is not carried out, it will directly affect the rooting of the next crop and cause root rot. In addition, the ground temperature will rise more slowly.

2. Carry out soil treatment to reduce the occurrence of soil-borne diseases. After the planting and growth of the previous crop of vegetables, a large number of pathogens and insect eggs have accumulated in the soil, which will cause infection of the next crop of vegetables. If soil treatment is not carried out, it will increase the probability of disease in the next crop. It is suggested that in addition to choosing a low-temperature fumigant to seal the greenhouse, Dexon or potassium permanganate should also be scattered into the soil when deep plowing to control soil-borne diseases; when planting crops, thiazophos or abamectin can also be applied in holes near the crop roots to control nematode damage.

3. Fertilize reasonably to prevent root burn and seedling fumigation. In winter, greenhouses are ventilated for only a short time and are covered with plastic film. If vegetable growers apply immature manure when preparing the land, the harmful gases produced during the decomposition of the manure cannot escape, and the roots and crop leaves close to damaged areas of the plastic film are very likely to be harmed, causing root burn and seedling fumigation. It is suggested that vegetable growers scatter fully decomposed manure or commercial organic fertilizer when deep plowing the soil.