One depends on soil fertilization: different types of trace elements contained in different soils are not the same, only to understand the lack of a certain element in the soil, the corresponding application of a certain element of fertilizer can be effective. At present, the soil content can be determined based on the parent material, soil texture, soil acidity and alkalinity. Such as boron deficiency, lack of zinc, its boron content is less than 0.5ppm, zinc is less than 1.5ppm, it is a lack of fertilizer. Before we can figure it out, we can apply it on a small area and then apply it on a large area. Otherwise, if we hear about what is missing, it may be counterproductive.
Second, we must look at the application of crops: different crops require different amounts of various trace fertilizers, such as rice needs silicon; rape, legumes, etc. need boron; garlic, onions need selenium.
Third, the amount of application: micro-fertilizer is generally basal. 100 ~ 200 grams of boron per mu, or 100 ~ 150 grams of zinc fertilizer, or 100 ~ 250 grams of ferrous sulfate, or 510 grams of copper sulfate, should not abuse.
Closed Suction Catheter,Medical Closed Suction Catheter,Pvc Suction Catheter,Closed Suction Catheter Disposable
Shaoxing Jenston Medical Products Co., Ltd. , https://www.sxjcmed.com