Kutheni Amanzi ethu e-Hydroponics eGumbini Lokufundela Ejike Aba Luhlaza Oqaqambileyo Ngenxa Yolwelwe (Algae)?
Ulwelwe lukhula ngokukhawuleza xa ukukhanya kudibana namanzi anezondlo ezininzi. Nasi isizathu sokuba i-PVC emhlophe namatanki akhanyelayo angasebenzi kakuhle, nendlela yokulungisa oku ngaphandle kweekhemikhali eziyityhefu.
Itanki lakho le-hydroponics lijike laba luhlaza kakhulu ngenxa yesizathu esilula sebhayoloji: iimbotyi ezincinci zolwelwe (microalgae spores) zifumene izondlo zeminerali ezinyibilikileyo (i-nitrogen ne-phosphorus), amanzi afudumeleyo, kunye nokukhanya. Ukuba ezi meko zontathu zikhona ngaxeshanye, ulwelwe luya kukhula kule nkqubo phakathi kweeyure ezingama-48 ukuya kwezingama-72. Phantse kuyo yonke inkqubo yasegumbini lokufundela, oyena nobangela ayingomxube ombi wezondlo okanye amanzi amdaka empompo; kukukhanya okungena ngeplastiki yetanki ekhanyelayo okanye imibhobho ebhityileyo ye-PVC emhlophe.
Inzululwazi Yokuvuza Kokukhanya Kwiinkqubo Zasezikolweni
Ulwelwe zizinto eziphilayo ezisebenzisa ifotosinthesisi (photosynthesis). Ngokungafaniyo neentsholongwane zeengcambu ezifana ne-Pythium (ukubola kweengcambu), ulwelwe lufuna ukukhanya ukuze lwande. Kwenkqubo efanelekileyo ye-nutrient film technique (NFT) okanye ye-deep water culture (DWC), umxube wezondlo kufuneka uhlale ebumnyameni ngokupheleleyo ukusukela ngomzuzu ophuma ngawo etankini kude kube lixesha obuyela ngalo.
Iiprojekthi zasezikolweni zihlala ziwaphula lo mgaqo ngezinto ezimbini eziqhelekileyo:
- Iibhokisi zokugcina ezikhanyelayo (translucent totes): Iibhokisi zeplastiki ezibonisa ngaphaya okanye ezinamafu ezithengwe ezivenkileni zingabonakala zomelele, kodwa zisasaza ukukhanya phakathi emanzini. Kwanamatanki aqhelekileyo aluhlaza okwesibhakabhaka okanye aluhlaza afaka imitha eyaneleyo ye-photosynthetically active radiation (PAR) exhasa ukukhula ngokukhawuleza kolwelwe phantsi kwezibane ze-fluorescent zasegumbini lokufundela okanye izibane ze-LED ezinamandla zokukhulisa izityalo.
- Imibhobho eqhelekileyo yeplam kaxakeka ye-PVC emhlophe: I-PVC emhlophe eqhelekileyo enodonga olubhityileyo (efana nemibhobho eqhelekileyo yogutyulo yasekhaya evela kwivenkile yezixhobo zokwakha) iyakhanyela kancinci. Nangona ibonakala imhlophe ngokuqinileyo ngamehlo enyama, xa ukhanyisa ngetotshi ngaphakathi kubonakala ukuba ukukhanya kungena lula eludongeni lwayo. Phantsi kwezibane ezikhanyisa kakhulu zokukhulisa izityalo okanye ukukhanya kwelanga ngqo kufuphi nefestile yasegumbini lokufundela elijonge emantla eMzantsi Afrika, ngaphakathi kwalo mbhobho we-PVC umhlophe kuguquka kube yigreenhouse yolwelwe.
- Izikhewu zeembiza ze-net ezingagqunywanga: Ukushiya imingxuma yeembiza ze-net (net pots) ivulekile, okanye ukusebenzisa izinto zokukhulisa ezingqukuva ezishiya izikhewu ezingqongileyo kwizikhondo zezithole, kuvumela imitha yokukhanya ukuba ibethe ngqo kumjelo wezondlo ongezantsi.
Kutheni Ulwelwe Luyilimaza Inkqubo (Kwaye Kutheni Iikhemikhali Zingesiso Isisombululo)
Ulwelwe aluhlaseli ngokuthe ngqo izikhondo zezityalo, kodwa lukhuphisana ngamandla ukufumana i-oksijini enyibilikileyo kunye nezondlo ze-ionic ezifunwa zizityalo zakho. Emini, ulwelwe luvelisa i-oksijini; ebusuku, lusebenzisa i-oksijini ngokuphefumla, lulambise indawo yeengcambu. Xa ulwelwe lusifa ekugqibeleni, iibhaktheriya ezibolisa izinto zisusa i-oksijini eseleyo emanzini, nto leyo ebangela iimeko ezingenamoya (anaerobic), amavumba amabi, nokubola ngequbuliso kweengcambu.
Xa oku kusenzeka, impendulo eqhelekileyo idla ngokuba kukongeza i-algicide yedama lokuqubha, i-copper sulphate, okanye iblitshi yasekhaya eyomeleleyo etankini. Kwimeko yezemfundo, le yimpazamo:
- I-algicide yasedamini yorhwebo kunye neekhompawundi ze-copper ziyaziphakamisa kwizihlunu zezityalo kwaye ziyityhefu xa zityiwa, nto leyo eyonakalisa kwangoko nayiphi na iprojekthi yasegumbini lokufundela ejolise ekukhuliseni ukutya okutyiwayo.
- Iblitshi eqhelekileyo yekhlorini ilimaza iinwele zeengcambu xa ikumlinganiselo ophakame ngokwaneleyo ukuba unokubulala ulwelwe, nto leyo ekhubaza okanye ibulale izityalo ezibuthathaka njenge-lettuce ne-basil.
- Unyango lweekhemikhali alusombululi isiphene sesakhiwo. Ngomzuzu apho ikhlorini iphela emanzini, iimbotyi zolwelwe ezisemoyeni ziya kubuyela kwaye zande emanzini akhanyisiweyo kwiintsuku nje ezimbalwa.
Isisombululo Sesakhiwo: Ukuthintela Ukukhanya Ngokupheleleyo
Ukulungisa amanzi aluhlaza ngokusisigxina kufuna ukuvimba ukukhanya ngokwasemzimbeni, hayi ukusebenzisa iikhemikhali. Unokwenza inkqubo esele ikhona ingangeni kukhanya kwaphela usebenzisa izixhobo eziqhelekileyo:
| Component | The Vulnerability | The Permanent Physical Fix |
|---|---|---|
| Reservoir Tank | Translucent plastic walls and lid | Wrap the exterior in black-and-white silage film (panda film) with the black side facing inward to block light and white facing outward to reflect ambient heat. Alternatively, paint the exterior with a base coat of matte black spray paint, followed by a coat of gloss white. |
| PVC Channels | Light penetration through thin white PVC walls | Wrap channels in reflective foil insulation, or use UV-stabilised, light-tight hydroponic channels rather than domestic plumbing pipe. |
| Lid Openings & Net Pots | Light leaking around rockwool or net cups | Fill net pots completely with opaque expanded clay pebbles (hydroton), and use opaque neoprene cloning collars around plant stems to seal light gaps. Cap any unused holes with solid, opaque lids. |
| Sight Tubes & Tubing | Clear vinyl water level tubes and delivery lines | Replace all clear vinyl tubing with opaque black or blue food-grade polyethylene tubing. Clear tubing will grow algae internally until it clogs pumps and drippers. |
Indlela Yokuhlambulula Nokumisela Ngokukhuselekileyo Inkqubo Yasegumbini Lokufundela Enolwelwe
Ukuba itanki lakho sele liluhlaza ngokuzeleyo, landela le nkqubo ingenatyhefu yokumisela ngokutsha ngexesha lesifundo esinye sokusebenza ngezandla:
- Drain and isolate: Pump the green nutrient solution directly down the drain or use it to water soil-based school garden beds (soil microbes will break down the algae naturally without harming outdoor plants).
- Scrub mechanical surfaces: Wipe down the reservoir walls and net pots using a clean cloth and warm water. Do not use dishwashing liquid or household detergents, which leave surfactant residues that strip plant root membranes.
- Disinfect with Food-Grade Hydrogen Peroxide: Fill the system with plain tap water and add standard 3% hydrogen peroxide (H₂O₂) at a rate of 5 to 10 ml per litre of water. Run the pump for 30 to 45 minutes. Hydrogen peroxide oxidises remaining algal cells on contact and breaks down harmlessly into pure water and oxygen, leaving zero toxic chemical residues.
- Empty and replenish: Drain the flush water, inspect your light seals, and mix a fresh batch of balanced hydroponic nutrients. Check the electrical conductivity (EC) kunye ne-pH ngaphambi kokuba uqhubele inkqubo kwakhona kwiingcambu zezityalo.
Ukuba uyila iiyunithi ezizisebenzelayo zokuvelisa ukutya okanye iidesika zokufundisa ngebhayoloji, iinkqubo zethu zezolimo ezihlakaniphileyo neze-hydroponics ezizinikeleyo zibandakanya imibhobho ekhuselekileyo ekutyeni nethintela ukukhanya ngokupheleleyo kunye nokubeka iliso kwitanki ngokuzenzekelayo ukuthintela ungcoliseko lwebhayoloji ngaphambi kokuba luqale.
Ukuthintela Ukutshisa Kakhulu Kwamanzi Kumagumbi Okufundela Afudumeleyo
Kwiimeko zasehlotyeni eMzantsi Afrika, amaqondo obushushu egumbini adla ngokugqitha kwi-30°C. Amaqondo obushushu aphezulu amanzi akhawulezisa kokubini ukukhula kolwelwe nokuphela kwe-oksijini. Xa uvala itanki lakho ekukhanyeni, phepha ukulisonga ngeplastiki emnyama kuphela okanye nge-duct tape emnyama ngaphandle komaleko wangaphandle obuyisa ubushushu; iindawo ezimnyama zifunxa ubushushu obusingqongileyo kwaye ziya kupheka indawo yeengcambu ngokukhawuleza.
Soloko usebenzisa indlela yomaleko ombini: umqobo wangaphakathi omnyama ukufezekisa ukungangeni kokukhanya nge-100%, ugqunywe ngomaleko wangaphandle omhlophe okanye wentsimbi (metallic) ukugxotha ubushushu kude netanki. Xa ukukhanya kuthintelwe ngokupheleleyo kumjikelo wezondlo, amanzi akho aya kuhlala ecacile, amaqondo e-oksijini aya kuzinza, kwaye iingcambu ziya kuhlala zimhlophe qhwa kuyo yonke ikota.
