What are the misunderstandings of greenhouse vegetable management in winter?
Greenhouse vegetables are a common way to grow vegetables in winter, but because of different planting patterns, the methods are different. However, many farmers have many misunderstandings in managing greenhouse vegetables in winter. Let's introduce Xiaobian to everyone.
What are the misunderstandings of greenhouse vegetable management in winter?
Misunderstanding 1: The more fertilization, the better. There are many vegetable farmers who say that greenhouses are high-input and high-yield dishes, and they are heavily fertilized in greenhouse vegetable fields in order to increase output. In fact, the total salt content of the soil required for normal growth of vegetables is 200010-6-300010-6. If there is reverse osmosis in the roots of 650010-6, the plants will die and the yield will drop. In particular, the temperature in the greenhouse is high, the humidity is high, the organic fertilizer is decomposed quickly, the effective phosphorus is 2-3 times higher than the exposed ground, and the amount of nitrogen volatilization is large, and the excessive application of fertilizer is easy to cause fertilizer damage.
Precautionary measures: First, the greenhouse for growing vegetables for more than 3 years, the decomposed chicken manure and cow dung are controlled within 2,500 kg, and the chemical fertilizer is also reduced by about 50%. Second, the plots with large salt content should be applied with cow dung, humic acid fertilizer and bacterial fertilizer to increase the soil carbon-nitrogen ratio, and at the same time loosen the soil, dissolve salt and reduce fertilizer damage. The third is to supplement micro-fertilizers such as boron, zinc and magnesium to balance soil nutrition, further reduce investment, and strive for sustained high yield.
Myth 2: The higher the temperature, the faster it grows. Many vegetable farmers believe that the purpose of building a greenhouse is to keep warm, and vegetables with high temperatures grow fast. In fact, vegetables have an upper limit on temperature, and the general temperature cannot exceed 32 °C. The temperature is too high, the respiration is strong, the physiological activity of the strain is disordered, the length is long, the vegetative growth and reproductive growth are not balanced, and the yield will decrease.
Precautionary measures: First, set up two air vents in the greenhouse to cool down in time. The second is to strictly manage the temperature required for the growth period of various vegetables and the temperature required for the growth period of each organ to prevent high temperatures from causing only long vines and no long fruit.
Misunderstanding 3: The more the seedlings are, the higher the yield. Many vegetable farmers always want to stay a few more when they stay in the seedlings, and think that the seedlings can produce high yields. In fact, due to low winter temperatures, weak light, poor photosynthesis, and low carbohydrate synthesis, reasonable thinning can produce high yields.
Precautionary measures: First, it is better to use vegetables in the winter. Second, in order to make full use of the space, it is possible to adopt the management method of early dense planting, medium-term sparse planting, and late sparse branching, which is subject to the fact that leaf branches are not crowded.
Misunderstanding 4: The more the plant grows, the better. Many vegetable farmers think that the plant is a good crop. In fact, the water leaves are too shallow, and the excessive growth of nutrients will inevitably affect reproductive growth, but the yield will decrease.
Precautionary measures: First, seedlings in the seedling stage, promote roots and tie, form strong seedlings. Because of the "deep roots of weak plants", we should master the principle of controlling the root depth of water-controlling plants, and strive to make the photosynthesis products in the lower part of the seedlings account for about 60%; in the middle and late stages of vegetable growth, the photosynthesis products in the underground and above-ground areas should each account for 50%. %. Second, in the early stage of vegetable growth, vegetative growth consumes 60% of nutrients, reproductive growth accounts for 40%; mid-term each accounts for 50%; late reproductive growth accounts for 60%-70%, and vegetative growth only accounts for 30%-40%, guaranteeing that there are A certain assimilation of leaf area, control of vines and fruit during the later period, and increase yield.
Myth 5: The more sick the drug is, the less sick it is. Many vegetable farmers spray a drug every 2-3 days in the middle and late stages of vegetable growth, and believe that the drug can be sprayed to prevent the spread of the disease.
Precautionary measures: First, improve the ecological environment. If the humidity is high, the leaves are flourishing, the ventilation is poor, and the daily spraying effect is not good. Second, the dead cockroaches caused by soil-borne bacteria should pay attention to improving the soil, pay attention to soil treatment and spray prevention when transplanting seedlings. If the source of the disease is neglected, the disease is in the seedling stage, and the disease is later attacked. The germ has invaded the plant, and the effect of spraying is not good. The third is to identify the disease, symptomatic spray, it is best to choose copper-containing preparations, which can kill fungi and kill bacteria, enhance the ability of plants to resist the invasion of bacteria, and promote crop growth.
Misunderstanding 6: The more the times, the higher the income. Many vegetable farmers believe that spending money to build a greenhouse cannot allow the land to be idle. Therefore, the deputy squatter and the main scorpion, the main scorpion scorpion scorpion, and the planting squatting times are often counterproductive, with low yield and low efficiency.
Precautionary measures: Arrange the mouthwash according to market conditions. One is to plant a large wintering plant, and it is better to plant one year in a year. The regeneration of eggplant, pepper, tomato and cucumber can be renewed at a low price. The second is to stay in the summer for a period of time to deepen the rain and drench the salt, expose the sun to sterilize, stagnate the insects, and mature the soil to ensure the soil is loose and breathable.
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