Commonly used micro fertilizer in addition to chemical fertilizers (such as borax, zinc sulfate, manganese sulfate, etc.), there are integrated fertilizer, glass fertilizer, slag or waste materials, etc., usually used as a base fertilizer and fertilizer. Its apply use a method to be: in the union before sowing prepare the ground to apply in soil, or mix with nitrogen, phosphor, potassium wait for fertilizer to be mixed together even apply, apply dosage should be mixed according to crop and microfertilizer kind and decide, should not be too big commonly. If the rice, seven water zinc sulfate per mu 1 kg, borax generally per mu with 0.5 kg to 1 kg, and to mix with manure and other organic fertilizer uniform base application, to prevent the centralized application of local hazards.
The soluble micro fertilizer was mixed into a certain concentration of water solution and sprayed on the stems and leaves of the crops. The advantage of this method is to avoid the harm caused by uneven fertilizer in the soil, and at the same time, it can be sprayed many times according to the specific needs in different development stages of crops to improve the fertilizer efficiency. Large areas with conditions can be applied by mechanical operation or aircraft spraying, generally spraying concentration of 0.01% to 0.05%.
It is one of the most economical and effective methods to soak seeds or mix seeds with water solution of trace elements before sowing, which can save much fertilizer. For example, the concentration of boric acid or borax is 0.01% to 0.03%. Use only 5 liters of this solution per 500 kilograms of seeds. Soybeans are seeded with ammonium molybdate and need only 10 to 20 grams per acre.