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First, different climatic conditions: insufficient light, small leaf area, low photosynthetic efficiency, poor ability to absorb fertilizer; temperature is too high, leaf surface pores are closed, it is difficult to absorb fertilizer. When the temperature is too low, the digestive bacteria activity in the soil decreases, the fertilizer is difficult to be converted, the decomposition rate is slow, and the fertilizer supply capacity is poor; in the long-term drought, the fertilizer is difficult to dissolve, and excessive accumulation causes damage. Excessive rain, fertilizer is easy to lose, but also volatile.
1. For soils with good texture and rich water and heat resources, due to the strong fertilization capacity, it is not advisable to invest a large amount of fertilizer at a time. It is only necessary to apply fertilizer according to the amount of fertilizer required at different growth stages of the crop.
2, temperature adjustment is enough to fertilize. Water is the carrier of nutrients, and temperature is the condition for the activation of nutrients. After the rain, it is necessary to fertilize the soil. When it is dry, it should be fertilized with water. Winter and spring should be tempered and fertilized. In summer, fertilization should be chosen when cooling down in the morning and evening.
Second, there are heavy obstacles: After planting a certain crop for many years, some soils will have flail or heavy sputum barriers. First, the crops will be deficient, and second, it will cause some diseases and reduce crops.
1. A field with a high degree of salinization that has regular obstacles to crop growth, first irrigating salt in the ditch, filling the shovel, and immersing irrigation to reduce salt.
2. Change the application of chemical fertilizer to increase the application of organic fertilizer, absorb more ammonium, potassium, calcium and other ions, adjust soil nutrient concentration, and enhance soil buffer capacity.
3, change the excessive fertilization for a small number of multiple fertilization.
4, change the soil shallow tillage for deep tillage, one can reduce the salt content, and the second can use deep salt-free soil.
Third, the surrounding environmental pollution: Some farmland is close to chemical plants, crops are often endangered, and some long-term application of nitrogen fertilizers, it is also easy to pollute the environment and inhibit the growth and development of crops.
1. Change the application of shallow application to deep application of fertilizer to avoid the volatilization and loss of chemical fertilizer.
2. Improve fertilizer preparations and regulate peak fertilizer supply. One can change a single variety of fertilizer into a broad-spectrum compound fertilizer. Second, according to the fertilizer characteristics of the crop, special fertilizer can be made. Third, the quick-acting fertilizer can be made into slow-release fertilizer by means of modification. Fourth, the inorganic fertilizer and the bio-organic fertilizer can be formulated into complementary complementary granular fertilizers to delay or delay the application time, so that the peak of fertilizer demand and the peak of fertilizer supply are linked to each other, and the fertilizer effect is fully exerted.
Fourth, crop wide open bare land: bare open space generally refers to the open space between the closure of dry land crops, such as cotton, fruit trees, before their branches and leaves have not been stretched, the exposed land between cotton and fruit trees is idle. In order to improve the fertilizer and water conditions of this land, it is possible to increase the fertilizer and increase the efficiency by covering the grass with bare air. Each acre of field can be covered with various types of hay 200~250 kg, and the amount of fresh grass is increased accordingly. One can guarantee that it is determined that the water content of the grass is 0.5~12.0% higher than that of the uncovered soil. The second can protect the fertilizer, the grass is 2.1 to 16.8 parts higher than the uncovered alkali nitrogen. Third, the soil organic matter can be increased by 0.05~0.30%. Fourth, the soil temperature can be adjusted in the hot season, and the grass is 1.3~3.8 °C lower than the temperature of 5 cm of the uncovered soil.
How to fertilize ecological conditions
Under normal ecological conditions, crop fertilization can increase production correspondingly, but after the ecological conditions change, contingency measures must be taken.
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