北京市农林科学院植物营养与资源研究所“八五”期间 ,在北京市科委立项的重点课题——缓释可控长效包膜尿素肥的研制与开发 ,已经通过了专家鉴定。专家组一致认为 :(1)目前化学氮肥当季利用率很低 ,研制可调控缓释氮肥对解决这一难题非常重要。该项研究生产性强 ,目的明确 ,符 Institute of Plant Nutrition and Resources Beijing Academy of Agriculture and Forestry, “Eighth Five-Year” period, the Beijing Municipal Science and Technology Commission set a key issue - sustained-release controlled long-term coating urea fertilizer research and development, has passed the expert assessment. The panel agreed that: (1) At present, the utilization rate of chemical nitrogenous fertilizer in the season is very low. It is very important to develop a controlled and slow-release nitrogenous fertilizer to solve this problem. The research is highly productive and purposeful