孔(kong)眼追肥用(yong)一(yi)塊木橛，在(zai)離(li)其(qi)主(zhu)根20～30厘(li)(li)米(mi)處，打一(yi)深30厘(li)(li)米(mi)左右的孔(kong)眼，放入適量(liang)三元素復(fu)合(he)肥，用(yong)濕土封好(hao)，若在(zai)其(qi)壟(long)兩側各打一(yi)個孔(kong)，效果更佳。

裂縫追肥(fei)9月份是紅薯(shu)塊(kuai)根膨(peng)大期，地表土層出現裂縫時，灌(guan)(guan)施裂縫肥(fei)可促(cu)使(shi)紅薯(shu)塊(kuai)根膨(peng)大。可作灌(guan)(guan)縫的肥(fei)料是：每(mei)畝用(yong)(yong)人糞尿750～1000公(gong)(gong)斤(jin)(jin)，兌(dui)清(qing)水(shui)500公(gong)(gong)斤(jin)(jin)混合后(hou)在下(xia)午(wu)5時左(zuo)右灌(guan)(guan)縫；每(mei)畝用(yong)(yong)磷(lin)酸二氫(qing)鉀500克，先用(yong)(yong)溫(wen)水(shui)溶解后(hou)，再摻入500公(gong)(gong)斤(jin)(jin)清(qing)水(shui)，澆灌(guan)(guan)在裂縫里；每(mei)畝用(yong)(yong)2.5公(gong)(gong)斤(jin)(jin)尿素，10公(gong)(gong)斤(jin)(jin)過磷(lin)酸鈣，用(yong)(yong)少量水(shui)溶解后(hou)，兌(dui)水(shui)500公(gong)(gong)斤(jin)(jin)灌(guan)(guan)根；每(mei)畝用(yong)(yong)100公(gong)(gong)斤(jin)(jin)草木灰溶解后(hou)，浸(jin)泡5個小時，濾去雜質(zhi)，兌(dui)水(shui)500公(gong)(gong)斤(jin)(jin)灌(guan)(guan)根。另外，值(zhi)得注意的是無論采用(yong)(yong)上述哪種方法灌(guan)(guan)根，動(dong)作要慢，灌(guan)(guan)肥(fei)液(ye)后(hou)，要立(li)即用(yong)(yong)細表土封嚴(yan)裂縫口，這樣，可減少肥(fei)效的揮發和水(shui)分的蒸發，又(you)起(qi)到耐(nai)旱保苗的作用(yong)(yong)。

葉(xie)面(mian)追肥(fei)適合甘薯噴(pen)(pen)(pen)(pen)施的葉(xie)面(mian)肥(fei)種類很(hen)多，常用的有1%～2%尿素溶(rong)液、2%～3%過(guo)磷酸(suan)鈣浸出(chu)液、5%～10%草木灰浸出(chu)液、0.3%磷酸(suan)二氫(qing)鉀(jia)溶(rong)液等。噴(pen)(pen)(pen)(pen)施時間(jian)，一(yi)(yi)天之中以下午5時左右為(wei)好，一(yi)(yi)般每畝噴(pen)(pen)(pen)(pen)灑75～100公斤，隔(ge)5～7天再噴(pen)(pen)(pen)(pen)一(yi)(yi)次(ci)，連噴(pen)(pen)(pen)(pen)2～3次(ci)。