1, concentration. Appropriate concentration of trace fertilizer can receive good results, and high concentration is not only unhelpful but harmful. 2, time. In order to reduce the loss of trace fertilizer in the spraying process, it is better to choose cloudy spraying. On sunny days, it is better to spray in the evening to extend the moistening time of the fertilizer solution on the stems and leaves of the crop to facilitate absorption. 3, dosage. The amount of trace elements required for vegetables is very small, and the critical range of various trace elements from the lack to the excess is very narrow. A slight lack or excess may cause harm. 4, the number of times. According to the growth and development of vegetables, usually 2-4 times. 5, mixed spray. Reasonable mixing and spraying between trace fertilizers or mixed spraying with other fertilizers or pesticides can play a role of “one injection and multiple effectsâ€, but it is necessary to clarify the physical and chemical properties of fertilizers and pesticides to prevent chemical reactions and reduce fertilizers. )effect. Arm Portable CMM Arm Portable CMM Automated Precision Inc. , https://www.apiasean.com