Trace element fertilizer is abbreviated as trace fertilizer, which is an indispensable nutrient element for normal growth and development of plants. Although the demand for them is small, they are equally important and irreplaceable as nitrogen, phosphorus, and potassium fertilizers. At present, the area of ​​arable land lacking trace elements has been increasing year by year. Therefore, it is necessary to apply trace elements. Micro-fertilizer has a good effect of increasing production, quality, and cost. Common micronutrients include ferrous sulfate, borax, manganese sulfate, zinc sulfate, and copper sulfate.

It is advisable to fertilize the micronutrients directly to the plants, such as seed dressing, soaking, rooting and foliar spraying. Foliar spraying is the most economical and effective. Spraying multi-component micronutrients has a better effect than single microelement fertilizer; spraying before and after flowering is better than spraying at the seedling stage; spraying in sunny or morning evenings is better than spraying at other times; spraying in foliar and rainy days is not appropriate. The general crop can be sprayed 1-2 times, and the fruit trees can be sprayed with sprayed pesticides several times. If the soil is to be applied with solid micronutrients, it should be applied only when the soil is severely deficient in microelements. At the same time, attention should be paid to uniform application, which is usually applied once every 3-4 years.

When applying micronutrients, one must consider the crop's response. For example, rape is very sensitive to boron deficiency, and the effect of boron application is good. Second, soil properties should be considered. For example, alkaline soil can reduce the effectiveness of iron, boron, manganese, copper, and zinc, and improve The effectiveness of molybdenum; micro-fertilizer is best applied in combination with nitrogen, phosphorus, and potassium fertilizers. Only when the crop meets the demand for a large number of elements, micro-fertilizer can have good results.

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