When the humic acid-containing water-soluble fertilizer is used as a foliar fertilizer, it can be applied during the entire growth period of crops, which can promote root growth, improve crop resistance, increase yield, and improve quality, but the application effect will not be the same as that when spraying insects. Quick-acting and obvious. The fertilization period should be determined by combining regional environment and crop growth characteristics.
1. When the crop is deficient, when the crop is deficient, the physiology and metabolism of the plant have been greatly affected. At this time, the humic acid foliar fertilizer is sprayed to take advantage of the complexation (chelation) properties of the humic acid. Activating metal cations such as iron, manganese, zinc, copper, synergistic fertilizer, promote nutrient absorption, etc., can quickly relieve the symptoms of deficiency and restore normal development.
2. When the soil pH is unbalanced, the soil pH is too high or too low is not conducive to crop growth and development. When the soil pH is 9.0, the vitality of the crop root system is reduced, and the nutrient absorption capacity is poor, which is easy to cause a deficiency. Acid soils are prone to magnesium, calcium, potassium, boron, molybdenum and other elements; alkaline soils are prone to iron, zinc, manganese, phosphorus and other elements. The use of foliar sprayed humic acid-containing water-soluble fertilizers can greatly alleviate the lack of nutrients caused by the weak root absorption function of the crops and maintain the body's function.
3. When the soil is dry or waterlogged, when the soil is dry or waterlogged, the crop root system is weakened, physiological obstacles occur, and the absorption capacity is reduced. Spraying humic acid foliar fertilizer can inhibit transpiration, reduce water loss and improve drought resistance; promote root development and restore root vitality.
4. Under salt stress when the soil is salinized or salinized, spraying humic acid water-soluble fertilizer can reduce the salt damage by reducing the ratio of sodium ions in the crop leaves to various cations such as potassium, calcium, magnesium, etc.
5. When crop diseases and insect pests occur in crop roots or aerial parts, due to reduced root absorption or transmission capacity, combined with pesticide control, combined with humic acid foliar fertilizer, can not only improve the pesticide control effect, but also supplement the lack of nutrients, Let the crop quickly resume normal growth and development.
6. When crops are damaged by freezing and dry and hot winds, when the crops encounter freezing damage, spraying humic acid foliar fertilizer on the leaves can significantly enhance plant resistance and reduce the damage caused by freezing damage. When encountering dry and hot wind, the water loss of crops is accelerated, and spraying humic acid foliar fertilizer on the foliage can increase the concentration of cytoplasmic liquid in the crops, prevent water loss and enhance the ability to resist dry and hot winds.
7. When the crop is physiologically impaired or weakened, the crop is long due to excessive nitrogen fertilizer application, and it is not easy to flower or bear fruit or fall flowers and fruits; when the load of the plant is too large, which affects normal growth and development; in the late stage of crop growth, the plant is weak and the root absorption capacity is obvious When declining, spraying humic acid foliar fertilizer on the leaves can quickly replenish humic acid and nutrients, restore the growth of the plants, coordinate the vegetative and reproductive growth of the plants, help to obtain higher yields, and improve the quality of agricultural products.
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