1.基肥。洋蔥基肥一般畝施(shi)廄肥約1000公斤(jin)，或施(shi)遲(chi)效性磷肥或過磷酸(suan)鈣(gai)30公斤(jin)、硫酸(suan)鉀15公斤(jin)，將上(shang)述各種肥料混勻后(hou)，結合翻耕、整(zheng)地把(ba)肥料施(shi)入土(tu)中(zhong)的中(zhong)上(shang)層，然(ran)后(hou)移苗栽植(zhi)。

2.追肥。洋蔥一般追肥三(san)四次。第一次在(zai)定植(zhi)后(hou)一星期內，畝(mu)(mu)施(shi)20％的人糞(fen)尿約(yue)(yue)(yue)(yue)800公(gong)(gong)(gong)斤，或(huo)硫(liu)酸(suan)銨(an)約(yue)(yue)(yue)(yue)10公(gong)(gong)(gong)斤，加(jia)水(shui)約(yue)(yue)(yue)(yue)800公(gong)(gong)(gong)斤澆施(shi)。第二(er)次在(zai)開(kai)春后(hou)，約(yue)(yue)(yue)(yue)3月間，畝(mu)(mu)施(shi)30％的人糞(fen)尿約(yue)(yue)(yue)(yue)800公(gong)(gong)(gong)斤，或(huo)硫(liu)酸(suan)銨(an)約(yue)(yue)(yue)(yue)10公(gong)(gong)(gong)斤，加(jia)水(shui)約(yue)(yue)(yue)(yue)800公(gong)(gong)(gong)斤，結(jie)合中(zhong)耕(geng)培(pei)土澆施(shi)。第三(san)次在(zai)4月上旬，蔥頭(tou)開(kai)始膨(peng)大時(shi)，畝(mu)(mu)施(shi)50％的人糞(fen)尿約(yue)(yue)(yue)(yue)800公(gong)(gong)(gong)斤，或(huo)硫(liu)酸(suan)銨(an)約(yue)(yue)(yue)(yue)10公(gong)(gong)(gong)斤，硫(liu)酸(suan)鉀約(yue)(yue)(yue)(yue)5公(gong)(gong)(gong)斤，加(jia)水(shui)約(yue)(yue)(yue)(yue)800公(gong)(gong)(gong)斤，結(jie)合中(zhong)耕(geng)除草(cao)澆施(shi)。在(zai)施(shi)肥中(zhong)磷(lin)、鉀素對(dui)洋蔥質量影響很大，可(ke)以(yi)使幼苗(miao)生長健壯，鱗莖充實，色澤(ze)鮮艷，并(bing)有促進早(zao)熟的功效。