First, the concentration Appropriate concentration of trace element fertilizer can receive good results. If the application concentration is too high, it is not only useless, but harmful. In general, the appropriate spraying concentration of various fertilizers is: boric acid or borax solution 0.05%-0.25%, ammonium molybdate solution 0.02%-0.05%, zinc sulfate solution 0.05%-0.2%, copper sulfate solution 0.01%-0.02 %. Second, the period The period of spraying fertilizer must be determined according to different vegetable varieties and different types of micro-fertilizers, and it is generally appropriate to spray before flowering. Third, the amount Generally 40-75 kilograms of mu fertilizer solution can make the stems and leaves of vegetables wet. Fourth, the number of Foliage spraying generally uses less fertilizer, which can not meet the needs of the whole growth and development process of vegetables. Therefore, it should generally be based on the length of its growth period, spraying 2-4 times is appropriate. V. Time In order to reduce the loss of trace fertilizer in the spraying process, which is beneficial to the absorption of leaves, it should be sprayed in the cloudy or sunny afternoons from the afternoon to the evening. This can extend the residence time of the fertilizer solution on the leaves of the vegetables and help to improve the spraying effect. Raw Sunflower Seeds,Plain Sunflower Seeds,Unroasted Sunflower Seeds,Raw Sunflower Wuyuan county dafeng oil food co.,ltd , https://www.dafengfood.com.cn