▎ 摘　　要

NOVELTY - Preparing the nano nitrogen capsules comprises (a) using nano graphene and nano silica as loading material for urea, (b) loading graphene with 80% urea by sonication and centrifugation, and (c) loading silica with 70% urea by sonication and centrifugation. USE - The method is useful for preparing the nano nitrogen capsules for nitrogen fertilization (claimed) in cereals, fruit trees, vegetables in protected cultivation of crops. Test details are described but no results given. ADVANTAGE - The method produces the nano nitrogen capsules which: used with graphene for nitrogen fertilization which increases nitrogen use efficiency by 90-95% of applied nitrogen; used with silica for nitrogen fertilization which increases nitrogen use efficiency by 80-85% of applied nitrogen; increases 50% of applied nitrogen; improves carriage, stability and bioavailability of nitrogen in soils during life span of plants; increases nitrogen use efficiency and crop performance by fabricated nano fertilizer in wheat crop; and replaces the large quantity of ordinary urea.