大棚滴灌(guan)(guan)(guan):溫(wen)(wen)室(shi)灌(guan)(guan)(guan)溉技術分(fen)類:從灌(guan)(guan)(guan)水特點(dian)來(lai)看(kan),目前大量應(ying)用(yong)(yong)的(de)溫(wen)(wen)室(shi)灌(guan)(guan)(guan)溉技術主要有三類:溝(gou)畦(qi)灌(guan)(guan)(guan)、微灌(guan)(guan)(guan)、潮汐灌(guan)(guan)(guan)。溝(gou)畦(qi)灌(guan)(guan)(guan)是采用(yong)(yong)管道(或渠道)輸(shu)水,并通(tong)過(guo)栽培溝(gou)或栽培畦(qi)進(jin)行灌(guan)(guan)(guan)溉的(de)方式(shi)(shi)。溫(wen)(wen)室(shi)內(nei)的(de)灌(guan)(guan)(guan)溉輸(shu)水如果采用(yong)(yong)渠道時一(yi)般應(ying)混凝土襯砌,起(qi)到防(fang)滲和(he)保護邊坡(po)的(de)作用(yong)(yong)。同時,為減(jian)少室(shi)內(nei)濕度,通(tong)常(chang)應(ying)該(gai)在灌(guan)(guan)(guan)水溝(gou)或畦(qi)上覆蓋地膜(mo),即采用(yong)(yong)膜(mo)下灌(guan)(guan)(guan)的(de)方式(shi)(shi)進(jin)行溝(gou)畦(qi)灌(guan)(guan)(guan)。
溝畦灌(guan)(guan)(guan)雖然不是(shi)一種灌(guan)(guan)(guan)溉(gai)技術(shu),但(dan)因(yin)具有(you)(you)投資低、管(guan)理簡單、使(shi)用方便等特(te)點,在現(xian)代溫室中(zhong)仍(reng)然大量(liang)被采(cai)用。微(wei)(wei)(wei)灌(guan)(guan)(guan)是(shi)微(wei)(wei)(wei)水(shui)(shui)灌(guan)(guan)(guan)溉(gai)的(de)簡稱,它是(shi)通過(guo)有(you)(you)壓(ya)供水(shui)(shui)管(guan)道系統與安裝(zhuang)在末級管(guan)道上(shang)的(de)灌(guan)(guan)(guan)水(shui)(shui)器(滴頭(tou)、微(wei)(wei)(wei)噴頭(tou)、滴灌(guan)(guan)(guan)管(guan)、微(wei)(wei)(wei)噴帶、滲灌(guan)(guan)(guan)管(guan)等),將水(shui)(shui)和作物生(sheng)長所(suo)需(xu)的(de)養分以(yi)較小(xiao)的(de)流(liu)量(liang),均勻(yun)準確(que)地直接(jie)輸送(song)(song)到作物根(gen)部(bu)附近(jin)的(de)土壤表面(mian)和土層中(zhong)或(huo)作物葉面(mian),實(shi)現(xian)局部(bu)灌(guan)(guan)(guan)溉(gai),使(shi)作物葉面(mian)或(huo)根(gen)部(bu)經常保持在水(shui)(shui)、肥、氣狀態的(de)灌(guan)(guan)(guan)水(shui)(shui)方法。微(wei)(wei)(wei)灌(guan)(guan)(guan)的(de)特(te)點是(shi)灌(guan)(guan)(guan)水(shui)(shui)流(liu)量(liang)小(xiao),一次灌(guan)(guan)(guan)水(shui)(shui)延續時間長,周期短,能夠較準確(que)地控制灌(guan)(guan)(guan)水(shui)(shui)量(liang),把水(shui)(shui)和養分直接(jie)輸送(song)(song)到作物根(gen)部(bu)附近(jin)的(de)土壤中(zhong)或(huo)葉面(mian),滿足作物生(sheng)長發育之需(xu)要。
微灌(guan)(guan)包(bao)括滴(di)灌(guan)(guan)、微噴灌(guan)(guan)和滲灌(guan)(guan)等多種方式。以(yi)(yi)斷續滴(di)水(shui)(shui)形式供(gong)水(shui)(shui)的(de)稱為(wei)滴(di)灌(guan)(guan);以(yi)(yi)小范圍(wei)噴灑形式供(gong)水(shui)(shui)的(de)稱為(wei)微噴灌(guan)(guan);以(yi)(yi)微孔隙緩慢滲出供(gong)水(shui)(shui)的(de)稱為(wei)滲灌(guan)(guan)。潮汐灌(guan)(guan)又稱漲(zhang)落灌(guan)(guan)、床灌(guan)(guan)或(huo)槽灌(guan)(guan),其主要原理是(shi);灌(guan)(guan)溉水(shui)(shui)被迅速充灌(guan)(guan)到能夠保持一定水(shui)(shui)深(shen)(1.25~5cm)的(de)作物(wu)裁培床或(huo)栽(zai)培槽中,在達到需要的(de)水(shui)(shui)深(shen)后及時排水(shui)(shui),以(yi)(yi)便利用(yong)土壤毛(mao)細管的(de)作用(yong)灌(guan)(guan)溉作物(wu)。