Vegetable experts remind farmers that the following three issues should be noted in the management of greenhouse vegetables: First, do not over-fertilize. Due to the high temperature and high humidity in the greenhouse, organic fertilizers decompose rapidly, and the amount of nitrogen volatilization is large. Over-fertilization can easily cause fertilizer damage. Therefore, for greenhouses that have been planted continuously for more than three years, the amount of chicken manure and cow dung should be controlled within 2,500 kilograms per mu, and the amount of chemical fertilizer applied should be reduced by about 50%. At the same time, boron, zinc, magnesium, etc. must be added. Fertilizer to balance the nutrients in the soil. The second is not to overheat. Some growers mistakenly believe that when the temperature is high, the vegetables grow faster. In fact, the upper limit of vegetable temperature is 25°C to 32°C. If the temperature is too high, the growth of young fruit will be inhibited, and the vegetative growth and reproductive growth of plants will also lose their balance, and the yield will not only increase, but also decrease, and some varieties may even show only long-vine or long-growth fruits. The third is not to leave too much seed. It has been determined that 50% of photosynthetic products are consumed by vegetative plants when 2 plants are planted on 1 m2, and another 50% of photosynthetic products are used for fruit growth. If 4 plants are planted per square meter, vegetative bodies will consume 70% to 80% of photosynthetic products. Therefore, dense planting results in a reduction in yield and is prone to various bacterial diseases.
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