1. Types of zinc fertilizers Materials with a specified amount of zinc to provide plant nutrients as their main function. Currently, the zinc fertilizers commonly used in production are zinc sulfate, zinc chloride, zinc carbonate, chelated zinc, zinc oxide, etc.
Among them, zinc sulfate heptahydrate (ZnSO4·7H2O, containing about 23% Zn) and zinc chloride (ZnCl2, containing about 47.5% Zn) are both white crystals that are easily soluble in water. When applying, it is necessary to prevent the zinc salt from being fixed by phosphorus.
2. The form and function of zinc fertilizer
Zinc is one of the essential trace elements for plants. Zinc is absorbed by plants in the form of cation Zn2+. The mobility of zinc in plants is medium.
Zinc indirectly affects the synthesis of auxin in crops. When crops are zinc deficient, the auxin content in stems and buds decreases, growth stagnates, and plants become short. Zinc is also an activator of many enzymes, which has a wide range of effects on plant carbon and nitrogen metabolism, thus contributing to photosynthesis. Zinc can also enhance plant stress resistance, increase grain weight, and change the ratio of seeds to stems.
For example: (1) It is a component of some dehydrogenases, carbonic anhydrases and phospholipases, which play an important role in the hydrolysis of substances, redox processes and protein synthesis in plants; (2) It participates in the synthesis of the auxin indoleacetic acid; (3) It is an essential component for stabilizing cell ribosomes; (4) It participates in the formation of chlorophyll. Plants with zinc deficiency will stagnate in growth and development, their leaves will shrink and their stem nodes will shorten. There are many zinc-deficient soils in China. The yield-increasing effect of zinc application on zinc-deficient soils is significant, especially for rice and corn. III. Application of zinc fertilizer Soil conditions and zinc fertilizer application: The effective zinc content in the soil is closely related to the effect of zinc fertilizer. According to the experiment of Henan Provincial Soil and Fertilizer Station, when the effective zinc content in the soil is less than 0.5mg/kg, the application of zinc fertilizer on wheat, corn and rice has a significant yield-increasing effect. When the effective zinc content in the soil is between 0.5mg/kg and 1.0mg/kg, the application of zinc fertilizer in calcareous soils and high-yield fields still has a yield-increasing effect and can improve the quality of crops.
3. Application characteristics of zinc fertilizer
1. Zinc fertilizer is applied to crops that are overly sensitive to zinc, such as corn, rice, peanuts, soybeans, beets, beans, fruit trees, tomatoes, etc. 2. Apply zinc fertilizer to zinc-deficient soil: It is better to apply zinc fertilizer to zinc-deficient soil, and it is not necessary to apply zinc fertilizer to soil that is not zinc-deficient.
Post time: Dec-09-2024
