Iibinta ugu fiican ee hawada hawo heerkulka kuleylka ee Shiinaha
Cadaadisku wuxuu saameyn toos ah ku leeyahay hufnaanta uumiga ee uumiga uumiga uumiga.
Mabda'a ugu weyn ee dareeraha dareeraha ah ee dareeraha ah waa kuleylka kuleylka. Marka dareere nitrogen ah uu galaaca uumiga, wuxuu ku kululaadaa kuleylka dhexdhexaadinta kuleylka, sida biyaha kulul ama waxyaabaha kuleylka korantada. Ka dib markii uu nuugo kuleylka, wuxuu si tartiib tartiib ah ugu beddelaa nitrogen-ka gaasous. Hawshan, heerkulka nitrogen dareeraha ah, halka heerkulka dhexdhexaadka kuleylku uu yaraado si ku habboon. Gawaarida uumiga waxaa badanaa lagu dhisaa dhowr tuubooyin kuleyl kuleylka ah ama guntin si loo kordhiyo aagga xiriirka ee u dhexeeya dareeraha dareeraha iyo dhexdhexaadinta kuleylka, kaas oo kordhiya hufnaanta kuleylka kuleylka.