Mai sarrafawa na fitarwa

Abinci mai sarrafawa (CRF) wani taki ne wanda ke fitar da abubuwan gina jiki a hankali a cikin ƙasa (watau, tare da lokacin da aka sarrafa).  An kuma san saki mai sarrafawa a matsayin taki mai sarrafa kansa, taki mai jinkirin saki, taki mai saurin saki, ko taki mai saukin aiki. Yawancin lokaci CRF yana nufin taki na nitrogen. Sannu-sannu da sarrafawa-sannu sun haɗa da kawai 0.15% (562,000 ton) na kasuwar taki (1995).

 Tarihi 
An fara samar da fasahar fitar da nitrogen mai sarrafawa wanda ya dogara da polymers da aka samo daga hada urea da formaldehyde a cikin 1936 kuma an sayar da su a cikin 1955. Samfurin farko yana da kashi 60 cikin 100 na jimlar nitrogen mai sanyi wanda ba a narke shi ba, kuma wanda ba a amsa shi ba (saurin saki) ƙasa da 15%. Methylene ureas, misali methylene diurea, an sayar da su a cikin shekarun 1960 da 1970, suna da kashi 25% da 60% na nitrogen a matsayin ruwan sanyi wanda ba a narkewa ba, da kuma nitrogen na urea wanda ba a amsa ba a cikin kewayon 15% zuwa 30%.

 Manazarta 

Rukuni:Shafuka masu fassarorin da ba'a duba ba