What are the latest misconceptions in winter greenhouse vegetable management?

Recently, because of cold air invasions, temperatures have dropped sharply, and at this time growing vegetables requires attention to details in some aspects, otherwise a small mistake can cause serious losses to greenhouse vegetables. In winter greenhouse vegetable management, the following misconceptions should be noted. Follow the editor and take a look.

1. The higher the temperature, the faster the growth

Many vegetable growers believe that the main function of a greenhouse is to keep warm, and that the higher the temperature, the faster vegetables grow. This is a wrong idea. Vegetables have an upper limit requirement for temperature; generally the temperature should not exceed 32 degrees. Once the temperature is too high, the respiration of vegetables will intensify, causing plant disorder, excessive vegetative growth, and an imbalance between vegetative growth and reproductive growth, and the yield will instead decline.

Preventive measures: First, set up two ventilation openings in the greenhouse to cool it down in time; second, manage strictly according to the temperature required during the vegetable growing period, so as to avoid the phenomenon of only growing leaves and not setting fruit caused by high temperatures.

2. The more fertilizer, the faster the growth

Many vegetable growers believe that fertilizer can promote the growth and development of vegetables, so the more fertilizer applied, the faster the vegetables grow. This is also a wrong idea. The soil salt content required for vegetable growth and development is limited; when excessive, the root system will instead undergo reverse osmosis, causing the plants to wither and die and the yield to decline. Especially in a high-temperature and high-humidity environment, organic fertilizer decomposes quickly, the volatilization of nitrogen fertilizer is large, and excessive fertilization can very easily cause fertilizer damage.

Preventive common knowledge: Generally, for plots that have been planted with vegetables for more than three years, farmyard manure needs to be controlled within 2500 kg, and chemical fertilizer needs to be reduced to about half. For plots with relatively high salt content, more humic acid and bacterial fertilizer should be applied to increase the soil carbon-nitrogen ratio, increase soil permeability, reduce oxygen content, and reduce fertilizer damage. In addition, fertilization should be balanced, and trace elements such as boron, zinc and magnesium should be supplemented to strive for sustained high yields.

3. The more vigorous the stems and vines, the better the growth

Many farmers believe that the more vigorous the stem and vine growth, the better the crop growth. In fact, with more water and vigorous leaves, the roots are necessarily shallow, and excessive vegetative growth will inevitably affect reproductive growth, instead reducing the yield.

Preventive measures: First, control the seedlings during the seedling stage to promote deeper root growth and form strong seedlings; second, in the early stage of vegetable vegetative growth it is vigorous, while in the later stage reproductive growth is delayed, so a certain assimilating leaf area is needed in the early stage. In the later stage, control the vines and promote fruit set to increase the yield.

4. The more frequently pesticides are sprayed, the fewer diseases there are

In order to prevent and control diseases and pests, many vegetable growers spray pesticides once every 2-3 days in the middle and late growth stages, because they think the more frequently the pesticide is sprayed, the lower the probability of disease occurrence. In fact, the more frequently pesticides are sprayed, the more likely it is to cause pesticide damage, which is extremely unfavorable to crop production.

Preventive measures: First, change the ecological environment. If the field humidity is high and the field permeability is poor, then even spraying pesticide every day will not necessarily help. Second, improve the soil. When transplanting, pay attention to soil treatment, especially soil-borne pathogens, and spray pesticides in a targeted way for prevention. Third, use the right remedy for the problem, and choose copper preparations as much as possible, which can kill both fungi and bacteria and also promote crop growth.

  The above is an introduction to misconceptions in winter greenhouse vegetable management. I hope it can help you. To learn more related knowledge, please follow us.