怎樣施(shi)肥可(ke)保蓮(lian)藕高產(chan)
蓮(lian)(lian)藕(ou)生長發育分(fen)3個時期,即萌(meng)芽期、旺(wang)長期和(he)結藕(ou)期,萌(meng)芽期從(cong)植株(zhu)萌(meng)芽到立葉(xie)出(chu)現。立葉(xie)后藕(ou)長出(chu)新(xin)根,主要靠藕(ou)貯藏的(de)(de)養(yang)(yang)分(fen);旺(wang)長期從(cong)植株(zhu)立葉(xie)到開始(shi)結藕(ou),養(yang)(yang)分(fen)需求量大,是(shi)追肥(fei)(fei)的(de)(de)關(guan)鍵期;結藕(ou)期從(cong)結藕(ou)到采收,藕(ou)和(he)蓮(lian)(lian)子(zi)同(tong)步發育,養(yang)(yang)分(fen)吸收減(jian)少(shao),莖稈和(he)葉(xie)片(pian)(pian)養(yang)(yang)分(fen)大多向藕(ou)和(he)蓮(lian)(lian)子(zi)轉(zhuan)移。因(yin)此(ci),總共(gong)要施(shi)(shi)(shi)3次肥(fei)(fei)。栽藕(ou)前將基肥(fei)(fei)翻入(ru)田(tian)中,一般畝施(shi)(shi)(shi)腐(fu)熟優質農家肥(fei)(fei)2000~3000公斤(jin),通(tong)用復(fu)合肥(fei)(fei)40~50公斤(jin)。追肥(fei)(fei)有2次。第(di)一次是(shi)立葉(xie)肥(fei)(fei),在田(tian)間出(chu)現3~5片(pian)(pian)立葉(xie)時,畝施(shi)(shi)(shi)氮(dan)磷型(xing)復(fu)混(hun)肥(fei)(fei)25~30公斤(jin);第(di)2次是(shi)滿田(tian)立葉(xie)時,畝施(shi)(shi)(shi)氮(dan)鉀型(xing)復(fu)混(hun)肥(fei)(fei)30~35公斤(jin)。
另外,淺水(shui)藕(ou)田和深(shen)(shen)水(shui)藕(ou)田施(shi)(shi)(shi)肥(fei)不相同,淺水(shui)田既可(ke)施(shi)(shi)(shi)復(fu)混肥(fei),又可(ke)施(shi)(shi)(shi)單質化肥(fei)。施(shi)(shi)(shi)前排水(shui),淺水(shui)施(shi)(shi)(shi)肥(fei),施(shi)(shi)(shi)后(hou)兩天再恢(hui)復(fu)水(shui)層。深(shen)(shen)水(shui)田則把復(fu)混肥(fei)與泥土(tu)混合(he)施(shi)(shi)(shi)用為好,這樣可(ke)以防(fang)止(zhi)肥(fei)料(liao)漂浮。