First, we must look at soil fertilization: different soils contain different types of trace elements. Only by knowing that there is a certain element in the soil, it is effective to apply a certain element of fertilizer. At present, soil content can be determined according to soil parent material, soil texture, soil pH and the like. Such as boron deficiency, zinc deficiency, boron containing less than 0.5ppm, zinc containing less than 1.5ppm, is a lack of micro-fertilizer. Before you can figure it out, you can apply it in a small area and apply it in a large area. Otherwise, if you hear about what is missing, it may be counterproductive.
Second, it should be regarded as the application of different materials: different crops require different amounts of various micro-fertilizers, such as rice requiring silicon; rape, legumes, etc. need boron; garlic, onion requires selenium.
Third, moderate dosage: micro-fertilizer is generally used as base fertilizer. 100-200 grams of boron per acre, or 100-150 grams of zinc fertilizer, or 100-250 grams of ferrous sulfate, or 510 grams of copper sulfate, should not be abused.
(Yi Yun)
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