"Greenhouse vegetables must be scientifically and rationally fertilized in order to obtain high yields and high efficiency. If fertilizers are used improperly, it will not only result in the failure of vegetables to produce less, but will also lead to soil compaction, resulting in vegetable fertilizer damage, and even excessive levels of nitrates and nitrites in vegetables." Harmful to human health, therefore, in greenhouse vegetable production, we must be careful to apply chemical fertilizers and scientific fertilization.” A few days ago, Li Linxiu, deputy head of the agronomist and Jingjing Station of the Agricultural Bureau of Nanjiang County, attended the training of large vegetable planters in Yushu Village, Dongbu Town. According to the report, greenhouse fertilization must pay attention to science and must pay attention to the following seven aspects of fertilization in the production process.

Farmyard fertilizers must be cooked

Greenhouse vegetables should be fully cooked when applying farmyard fertilizers. Because pathogenic bacteria and eggs are not present in decomposed farmyard fertilizers, it is easy to spread the disease if it is applied to vegetables.

In addition, if the farmhouse fertilizer is put into a greenhouse and then decomposed, ammonia gas will be produced and the vegetable seedlings will be burned. Therefore, the farmyard fertilizer should be fully cooked before use.

Due to anaerobic fermentation, biogas fertilizer basically kills all harmful bacteria and eggs, and can also loosen the soil. It is a high-quality farmyard fertilizer and should be widely promoted.

Fertilization method should be reasonable

Basal fertilizer is best applied one week before the colonization of vegetables, and it should be mixed well with the soil. Fertilizer can be planted 7-10 cm away from the plant ditch or hole chase. After the topdressing, cover the soil and water in a timely manner. Do not spread the fertilizer directly on the ground or on the plants so as to prevent the fertilizer from volatilizing or burning the vegetable seedlings.

Fertilizers outside the roots should be at the peak of the fertilizer needed for vegetables and the late growth of vegetables. It's best to choose to do it on cloudy days or evenings. Spray as far as possible on the new leaves and the back of the leaves to help the vegetables absorb.

Appropriate fertilizer application

Fertilizers in greenhouses are not easily lost. Excessive application of chemical fertilizers will increase the concentration of salt in the soil, leading to soil salinization.

To control nitrogen fertilizers and increase phosphorus and potassium fertilizers, the nitrogen fertilizers to be banned or limited shall be ammonium nitrate, potassium nitrate and compound fertilizers containing nitrate nitrogen. In greenhouse vegetable management, it is necessary to increase ventilation time and enhance light intensity, which can reduce the nitrate content of vegetables.

Greenhouse vegetables should not be applied with chlorinated fertilizers. Because chloride ions can reduce the starch content in vegetables, the quality deteriorates, and residues in the soil can cause soil compaction.

At the same time, limited use of magnesium sulfate, ammonium sulfate fertilizers. Because sulfate ions are not easily absorbed by vegetables, long-term application will remain in the soil and endanger the growth of vegetables.

The amount of micro fertilizer should be suitable

Although the demand for trace element fertilizers on vegetables is small, its role in the metabolism of vegetables is very great, which can greatly improve the quality of vegetables. The commonly used micronutrients include boron, molybdenum, zinc, and iron fertilizers. Micro-fertilizer is used as base fertilizer and can also be used for seed dressing, soaking or top dressing. The range between the appropriate amount of fertilizer and excess fertilizer is relatively narrow, so the amount must be accurately grasped in accordance with the instructions to avoid causing damage.

Use plant growth regulators properly

Plant growth regulators (such as gibberellin, ethephon, paclobutrazol, etc.) can promote the production of vegetables if used properly, but each regulator has certain conditions and scope in application, especially to use Time and concentration cannot be careless, otherwise the effect of increasing vegetable yield cannot be achieved. With improper use of plant growth regulators, people's long-term consumption will be detrimental to their health.

Application of bio-organic fertilizer

Biofertilizer contains microorganism-activated bacteria. It is a “four-in-one” fertilizer compounded by organic fertilizers, inorganic fertilizers, bacterial fertilizers, and synergists. It realizes the scientific formulation of various fertilizers, complements each other's advantages, and promotes mutual benefits. One of the best fertilizers for achieving balanced fertilizer application in greenhouses; vegetable-specific compound fertilizers are developed based on the characteristics of fertilizers required for different vegetables and soil supply conditions. The nutrients are more complete, the nutrition is more scientific, the formula is more reasonable, and the specificity is more Strong, can significantly increase the yield and quality of greenhouse vegetables after application.

At the same time, the application of bio-organic compound fertilizer is also beneficial to improve the soil, increase soil fertility, and create a good environment for the growth of vegetables.

You should use a lot of biogas fertilizer

Biogas fertilizer is an ideal fertilizer for improving vegetable greenhouses.

The use of fermented biogas residue as a base fertilizer for vegetable production, and biogas slurry for various vegetable foliar top dressings not only enables all kinds of vegetables to grow vigorously, has a faster growing speed, and has increased disease resistance, and can prevent the occurrence of diseases and insect pests and improve vegetables. Yield and quality. After follow-up tests, fruits and vegetables grown with biogas fertilizer can increase production by 20%, and leaf vegetables can increase yield by about 30%.

The use of biogas residue and biogas slurry as fertilizer for production in greenhouses not only sterilizes, eliminates poisons, eliminates disease, and exterminates insects. What's more important is that it can increase soil organic matter and increase soil fertility for years, providing enough for the production of pollution-free vegetables. stamina. The well-fermented biogas residue is a highly effective and efficient decomposed organic fertilizer that can be used as a top-dressing fertilizer for various vegetables at any time. The dressing is generally done with a planer hole and chasing the nest after chasing it. Fruits and vegetables such as tomatoes, cucumbers, eggplants, melons, etc., have an average rate of 1,000-1,500 kilograms of fertilizer per acre, and an average of 15%-20% of fruit and vegetable production per acre.

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