How to use scientific and rational use of trace element fertilizers in agricultural planting? Trace element fertilizers are mainly inorganic salts or oxides. Some minerals, metallurgical by-products or waste materials can often be used as raw materials for trace element fertilizers. The production methods are the same as those for inorganic chemical products. In addition, there are two forms of trace element fertilizers: one is a glassy substance containing trace nutrients, which is made by co-melting the corresponding inorganic salt or oxide with silica;
The other is a chelate of a metal element such as a chelate of copper, iron, manganese and zinc with ethylenediaminetetraacetic acid (EDTA). This chelated micronutrient fertilizer is effective and quick-acting, but it is costly and has not been widely used.
Since the application amount per unit area is small, it must be diluted with a large amount of inert material before application, and uneven application may poison some crops. Trace element fertilizers are often mixed into a constant fertilizer for application together.
Two methods are usually used: mixing in the production of a constant granular fertilizer. This method is convenient and economical, and does not produce nutrient unevenness. The disadvantage is that the flexibility is poor, and it is difficult to meet various requirements of the market; the trace element fertilizer powder is coated on the surface of the constant granular fertilizer.
This operation can be carried out in a secondary processing plant and can meet the needs of the market at any time. The constant granular fertilizer and the trace element fertilizer are mixed in a small mixer for about 1 minute, and then a small amount of an aqueous solution of oil, water or trace element salts is sprayed, and mixing is continued, and the product remains dry.
How to use scientific and rational use of trace element fertilizers in agricultural planting? There are two methods for applying trace element fertilizers: soil application and foliar application.
Soil fertilization: commonly used micro-fertilizers in addition to chemical fertilizers (such as borax, zinc sulfate, manganese sulfate, etc.) as well as integrated fertilizers, glass fertilizers, slag or scraps, are often used as base fertilizers and seed fertilizers.
The application method is as follows: before planting, combined with soil preparation, or mixed with nitrogen, phosphorus, potassium and other chemical fertilizers, the application amount is determined according to the type of crops and micro-fertilizers, and generally should not be too large.
For example, for rice, zinc sulphate is applied 1 kg per mu, borax is generally used from 0.5 kg to 1 kg per mu, and it should be mixed with manure and other organic fertilizers to prevent local damage caused by concentrated application.
Top dressing: The soluble micro-fertilizer is formulated into a certain concentration of aqueous solution to spray the stems and leaves of the crop. The advantage of this method is to avoid the harm caused by uneven fertilizer in the soil. At the same time, it can be sprayed several times according to the specific needs in different development stages of the crop to improve the fertilizer efficiency.
Conditional areas can be mechanically or aircraft sprayed on a large area, typically at a spray concentration of 0.01% to 0.05%. In addition, soaking seeds or seed dressing with an aqueous solution of trace elements before sowing is also the most cost-effective method of use, which can greatly reduce the amount of fertilizer used.
This article URL: How to use scientific and rational use of trace element fertilizer for agricultural planting
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