Ukunisela kwezolimo kubangela ngaphezu kwama-70% okuhoxiswa kwamanzi ahlanzekile emhlabeni wonke, kodwa ukusetshenziswa kwamanzi okungasebenzi kahle—okubangelwa ukuqagela, ukuqapha okudala, kanye nokusatshalaliswa okungalingani—kuchitha izigidigidi zama-cubic metres minyaka yonke. Njengoba ukuntuleka kwamanzi kuya kuba kubi, abalimi nabaphathi bezolimo badinga amathuluzi okulandelela, ukwenza ngcono, nokunciphisa ukusetshenziswa kwamanzi okunisela. Amamitha okugeleza kwesiteshi esivulekile, aklanyelwe ukukala ukugeleza kwamanzi eziteshini ezingacindezelwe (isb., imisele, imisele, kanye nemisele yokunisela) evamile kwezolimo, avele njengesixazululo esiyinhloko sokuthuthukisa ukongiwa kwamanzi kwezolimo. Ngokunikeza idatha yokugeleza enembile, yesikhathi sangempela, la mamitha aguqula ukunisela “okuyimpumputhe” kube umkhuba oqhutshwa idatha, anciphise imfucuza ngenkathi evikela isivuno sezitshalo.
Inkinga Ngokunisela Okungaqaphelwa
Ukunisela kwezolimo kwendabuko kuvame ukuncika ezilinganisweni ezingacacile: abalimi bangase banisele amasimu ngokusekelwe esikhathini (isb., “ukusebenzisa umsele amahora ama-2”) noma izinkomba ezibonakalayo (isb., “linda kuze kube yilapho inhlabathi ibukeka yomile”), kunokuba kusetshenziswe ukugeleza okuqondile noma amanzi ezitshalo. Lokhu kuholela ekungasebenzeni kahle okubili okubalulekile:
- Ukunisela ngokweqile: Ngaphandle kokwazi amazinga okugeleza aqondile, abalimi bavame ukusebenzisa amanzi amaningi kunalawo adonswa yizitshalo. Amanzi amaningi akhipha izakhamzimba enhlabathini, achithe amandla (okupompa), futhi aqede imithombo yamanzi ahlanzekile endawo (isib. amanzi angaphansi komhlaba noma imifula).
- Ukusatshalaliswa okungalingani: Ezinhlelweni ezinkulu zokunisela, ukugeleza okungaqaphelwanga kungabangela ukuthi amanye amasimu athole amanzi amaningi kakhulu kanti amanye athola amanzi amancane kakhulu—okulimaza isivuno kanye nokuchitha izinsiza.
Isibonelo, umlimi osebenzisa umsele ongaqaphelwanga angase angaqapheli ukuthi ingxenye evinjiwe inciphisa ukugeleza ensimini eyodwa, okumenza asebenzise uhlelo isikhathi eside ukuze alungise lokhu—ngokungahlosile ukugcwala kwenye insimu kule nqubo. Amamitha okugeleza esiteshi esivulekile axazulula lokhu ngokulinganisa ukugeleza, asuse ukuqagela.
Indlela Amamitha Okugeleza Kwesiteshi Esivulekile Agcina Ngayo Ukulondolozwa Kwedrayivu
Amamitha okugeleza kweziteshi ezivulekile asebenzisa ubuchwepheshe obufana nezinhlelo ze-ultrasonic, i-radar, noma i-weir/flume ukukala ukugeleza kwamanzi eziteshini ezingenawo umfutho—okufanelekile kakhulu engqalasizinda yokunisela abalimi abayisebenzisa kakade. Umthelela wabo ekulondolozweni kwezindawo uwela ezindaweni ezintathu ezibalulekile:
1. Ukulinganisa Ukugeleza Okunembile Kokunisela “Osayizi Ofanele”
Lawa mamitha ahlinzeka ngedatha yesikhathi sangempela yokuthi angakanani amanzi ageleza emzileni ngamunye noma ensimini. Abalimi bangafanisa amazinga okugeleza nezidingo zezitshalo: isibonelo, ummbila omncane ungadinga amalitha angu-50 ngomzuzu ngehektha ngalinye, kuyilapho ukolweni ovuthiwe udinga amalitha angu-30 kuphela. Ngokubeka amamitha okugeleza ukuze kuqalwe izexwayiso uma amazinga edlula noma ehla ngaphansi kwamazinga aqondiwe, abalimi bagwema ukuchelela ngokweqile futhi baqinisekise ukuthi izitshalo zithola lokho kanye ezikudingayo. Izifundo zibonisa ukuthi lokhu kunemba kunganciphisa ukusetshenziswa kwamanzi okuchelela ngo-15-30% ngaphandle kokunciphisa isivuno.
2. Ukutholwa Kokuvuza Nokuvinjelwa Ukuze Kumiswe Udoti
Iziteshi zokunisela namapayipi zivame ukuba nokuvuza, imifantu, noma ukuvaleka—izinkinga ezinganakwa ngaphandle kokuqapha. Amamitha okugeleza esiteshi esivulekile abonisa ukungalingani: ukwehla kokugeleza okungazelelwe kungase kubonise ukuvaleka (isb., udoti emgodini), kuyilapho ukwanda okungalindelekile kungabonisa ukuvuza (isb., ulwelwesi lomsele oluqhekekile). Ngokubamba lezi zinkinga kusenesikhathi, abalimi balungisa izinkinga ngokushesha, bevimbela izinkulungwane zamalitha amanzi ekuchithweni. Isibonelo, ukuvuza okuncane emseleni kungachitha amalitha afinyelela ku-10,000 nsuku zonke—into imitha yokugeleza engayithola phakathi namahora.
3. Ukulandelela Idatha Ukuze Kusebenze Kahle Isikhathi Eside
Amamitha okugeleza amaningi eziteshi ezivulekile zesimanje agcina idatha yomlando (isb., inani lokugeleza kwansuku zonke noma kwamasonto onke) futhi ahlanganiswe namadeshibhodi alula. Abalimi bangahlaziya le datha ukuze bathole amaphethini: “Ingabe i-Field A isebenzisa amanzi amaningi ngoMsombuluko?” noma “Ingabe isiphepho senyanga edlule sinciphise isidingo sethu sokunisela?” Ngokuhamba kwesikhathi, le datha isiza ekulungiseni amashejuli okunisela—isibonelo, ukunciphisa ukugeleza ngezikhathi zemvula noma ukulungisa amazinga njengoba izitshalo zivuthwa. Iphinde isekele ukuhambisana nemithethonqubo yamanzi yendawo, edinga kakhulu abalimi ukuthi balandele futhi babike ukusetshenziswa kwamanzi.
Umthelela Wangempela: Icala Lamapulazi Amancane
Ngisho nabalimi abancane bayazuza ngamamitha okugeleza kwemisele evulekile. Ezifundeni ezifana ne-US Great Plains noma i-Punjab yaseNdiya, lapho amazinga amanzi angaphansi komhlaba ehla khona ngokushesha, abalimi abasebenzisa la mamitha babike ukonga okukhulu kwamanzi. Ipulazi lomndeni eNebraska, isibonelo, lifake amamitha okugeleza kwemisele evulekile ye-ultrasonic emiseleni yalo yokunisela futhi lanciphisa ukusetshenziswa kwamanzi ngo-22% ngesikhathi esisodwa sokulima—lisindisa imali ezindleleni zokupompa ngenkathi lisiza ekulondolozweni kwe-Ogallala Aquifer. ENdiya, izinhlangano zokunisela zamaqembu zisebenzisa amamitha okugeleza ukuhlukanisa amanzi ngokulinganayo phakathi kwabalimi, kunciphisa izingxabano futhi kuncishiswe imfucuza iyonke ngo-18%.
Isiphetho
Amamitha okugeleza kwesiteshi esivulekile awawona nje amathuluzi okulinganisa—ayisisusa sezolimo eziqhubekayo. Ngokuguqula izindlela zokunisela ezingacacile zibe izinqumo eziqondile, eziqhutshwa idatha, anciphisa imfucuza yamanzi, avikele izinsiza zamanzi ahlanzekile, futhi aqinisekise ukuthi izitshalo zithola amanzi eziwadingayo ukuze zichume. Njengoba ukuntuleka kwamanzi emhlabeni wonke kukhula, la mamitha azoba ithuluzi elibalulekile kubalimi abazinikele ekulinganiseni umkhiqizo nokonga—ukuqinisekisa ukutholakala kokudla kanye nekusasa lamanzi ezizukulwaneni ngezizukulwane.
Isikhathi sokuthunyelwe: Septhemba-10-2025