Select the appropriate spraying site. On plants, in the lower part of the leaf, stem due to the different metabolic activity, to the ability to absorb nutrients outside the strength differences, to select the appropriate spraying site. Add additives. When foliar spray fertilizer solution appropriate to add additives to improve liquid fertilizer on plant leaves adhesion fertilizer, promote the absorption of fertilizers. And soil fertilization combined. Because the roots than the leaves have a larger and more complete absorption system, a large amount of nutrients such as nitrogen, phosphorus, potassium, etc., it was determined to be more than 10 times the total amount of foliar fertilizer to reach the roots to absorb nutrients. So foliar fertilization can not completely replace the roots of crops, foliar fertilizer production, must be combined with the root fertilization. Cereal crops such as grain is not full, grain weight reduce foliar wholesale, multi grain husks; increased cotton boll rot, boll shell thickness, reduce cotton fiber quality; low sugar content of fruit and sugar cane, poor flavor; potato's smaller tubers; flue-cured tobacco leaf thickening, easy baking, high salinity content, poor quality; legumes lush foliage, little pod, lower crop yields, celery petiole thinning foliar species, leaves large easy to lodging , maternity leaves in late delay, along with delayed harvest. In addition, too much nitrogen will increase the nitrate content in leaves, nitrosamines, betaine, oxalic acid, etc., affect the content of vegetable oils and other substances. Resulting in decreased crop quality, production, or even result in the deterioration of physical and chemical properties of soil and groundwater contamination. Especially in the protected cultivation conditions, should pay attention to the rational use of nitrogen fertilizer. Amino acid fertilizer, fertilizer, bio-technology provided by Shouguang Marvell Marvell biotechnology company. Shouguang Maiwei Biotechnology Limited (www.maiweishengwu.com) strong, credible, Shandong Weifang biological fertilizer industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Marvell biotechnology and you work into the brilliant, for a better future!