所谓“释放”是指养分由化学物质转变成植物可直接吸收利用的有效形态的过程（如溶解、水解、降解等）；“缓释”是指化学物质养分释放速率远小于速溶性肥料施入土壤后转变为植物有效态养分的释放速率；“控释”是指以各种调控机制使养分释放按照设定的释放模式（释放率和释放时间）与作物吸收养分的规律相一致。因此，生物或化学作用下可分解的有机氮化合物（如脲甲醛UFs）肥料通常被称为缓释肥（SRFs），而对生物和化学作用等因素不敏感的包膜肥料通常被称为控释肥（CRFs）。
缓释肥料 Slow-release fertilizer ; controlled release fertilizer ; SRFS
保水缓释肥 water retaining and slowly-release fertility
添加有机缓释肥 SROF
对缓释肥料 SlowReleaseFertilizer ; SRF
有机缓释肥 slow-release organic fertilizer
被称为缓效或缓释肥料 Slow-release fertilizers ; SRF
化学缓释肥 chemical slow-release compound fertilizer
颗粒缓释肥 granular slow release fertilizer
袋控缓释肥 Bag-controlled release fertilizer
Adhering to the scientific application of nitrogen fertilizer,promoting controlled slow-release fertilizer and nitrogen-phosophrous-potassium mixed fertilizer not only made access to high-yield,but also reduced the harm of deseases and pests,and reduced the waste and pollution caused by nitrogen loss.
坚持科学施用氮肥,推广应用控缓释肥和适氮适磷钾复合肥,不仅使水稻获得高产,而且可减轻病虫危害,减少因氮肥流失而造成的浪费和污染。
参考来源 - 杂交水稻高产节氮栽培对二化螟发生危害的影响—《现代农业科技》—2010年第8期—龙源期刊网These precipitate have characteristics of great density,good sedimentation capability,and poor water absorption, slow dissolution rate. What's more,they are not inclined to agglomeration during long-term storage,which shows their potential use for slow release fertilizer of crops.
鸟粪石晶体在显微镜下呈针斜状、叉状,随磷初始浓度增大和反应时间的推移逐步变长变粗实;沉淀物密度大、沉降性能好、吸水性差、溶解速度慢、长期贮存无结块倾向,可作为农作物的缓释肥使用。
参考来源 - 鸟粪石结晶法回收废水中磷的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
作为缓释肥，具有良好的经济效益。
The struvite can be made as the controlled release fertilizer, which has good economic benefit.
结果表明：有机缓释肥具有营养全面、养分缓慢释放的特点。
Results showed that OSRF possessed the characteristics of overall supply and slow-release of nutrients.
说明缓释肥一次性施用基本可以满足小麦整个生长期的需要。
So, the wheat's demand for nutrient during the growth period can be met mostly with the basal application of the slow release fertilizers.
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