1. Concentration
The appropriate ability to spray the concentration receives good results, and the excessive concentration is not only unhelpful but harmful. Usually boric acid or borax 0. 05% - 0.25%, ammonium molybdate 0. 02% - 0. 05%, copper sulfate 0. 01% - 0. 02%. If high concentration is required, it should not exceed 20% of the specified concentration.
2. Period
In order to reduce the loss of micro-fertilizer in the spraying process, it is best to choose spray on cloudy days, and on sunny days, it should be sprayed in the afternoon to dusk to extend the wet time of the fertilizer on the stems and leaves as much as possible to facilitate absorption.
3, the amount of
The amount of trace elements required for vegetables is small, and the critical areas of various trace elements ranging from lack to excess are narrow, and a slight lack or excess may cause damage. Usually, 40-75 kilograms of fertilization solution per mu can make the stems and leaves of vegetables evenly wet, avoiding repeated application.
4, the number of times depending on the growth and development of vegetables, usually 2-4 times.
5, mixed spray
Reasonable mixed spraying between micro-fertilizers, or mixed with other fertilizers or pesticides, can play the role of “one spray and multiple effectsâ€, but it is necessary to clarify the physical and chemical properties of fertilizers and pesticides, avoid chemical reactions and reduce fertilizers. )effect.
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