Kunenqwaba yezinto abalimi okufanele bazithathe lapho bakha i-greenhouse noma indawo yokutshala.
Okokuqala, kunemijikelezo yokuphila yezitshalo futhi kukhule indawo yokukhanya. Bese kuba khona ukushisa nokukhanya, ingasaphathwa indawo nemakethe. Akumangalisi ukuthi ukubhekana nenselele enjalo kungase kubonakale kunzima kakhulu, ukuqala ngayo okungenani. Okuhlanganisa inkinga ama-acronyms, futhi njengezimboni eziningi, i-agritech inejargon yayo yokuchaza. Lawa ma-acronyms - PAR, PPF, PPFD - asetshenziswa eduze kwamagama afana nama-watts, i-lumens, ukusebenza kahle kwe-photon kanye ne-LUX, abalulekile ekusizeni ukuthi uthuthuke emkhakheni owukhethile (kwabanye, ngokwezwi nezwi) ukuze wakhe indawo ekahle yokukhula kanye nesivuno.
Kodwa-ke, njengezinto eziningi ekuphileni, ukuqonda ukuthi zisho ukuthini kungase kubonakale kunzima ekuqaleni kodwa kungase kutholakale ngokushesha. Lapha, sinikeza umbono wokuthi i-PAR, i-PPF ne-PPFD isho ukuthini, nokuthi kungani ibalulekile kuwe ukuthi uzazi:
I-PAR (I-Photosynthetic Active Radiation)
I-PAR iwuhlobo lokukhanya oludala i-photosynthesis futhi lwenzeka lapho isitshalo sakho sisebenzisa ama-photon wamaza okukhanya ahlala ngaphakathi kwebanga elibonakalayo lama-nanometers angu-400 kanye nama-700.
Ekuqaleni kuchazwa ucwaningo olwenziwa uDkt. Keith McCree ekuqaleni kwawo-1970, i-PAR ayikukali ukukhanya kodwa igama elingasiza umlimi anqume uhlobo nomthamo wokukhanya odingekayo ukuze uthole isivuno esihle sezitshalo nempilo. Isetshenziswa amasistimu okukhanya okukhulayo ukulingisa ukukhanya kwemvelo, ukukhanya kwe-PAR kungathuthukiswa nezinye izixazululo zokukhanya ukuze kushintshwe ukuminyana kokukhanya, ukusetshenziswa, nezilinganiso.
Kusho ukuthini lokhu kumlimi?
I-PAR igama okufanele lisetshenziswe ukusiza ukuqaphela ngokuphelele ukwakheka kokukhanyisa nokusetshenziswa.
Ezinye zezinto ezibalulekile eziyisisekelo okufanele uziqonde ngaphambi kokuthenga izibani ezikhulayo noma ukusayina noma yini ukwazi ukuthi zikhiqiza i-PAR engakanani, zisebenzisa amandla angakanani ukuze zikhiqize i-PAR yazo, nokuthi ingakanani i-PAR etholakalayo ezitshalweni.
I-PPF (Photosynthetic Photon Flux)
I-PPF igama elisetshenziselwa ukuchaza ukukalwa kwe-PAR futhi iyisithako sesibili esibalulekile eresiphi yakho ekukhanyiseni okuphelele kwendawo yakho yokukhula. Inani layo linquma ukuthi ingakanani i-PAR ekhiqizwa yinoma ubani isistimu yokukhanyisa phakathi nenkathi yesekhondi. I-PFF izokusiza ukuthi uthole ukuthi kungakanani ukukhanya okukhiqizwa yisistimu yakho yokukhanyisa kungasetshenziswa izitshalo zakho ukwenza i-photosynthesis.
Kusho ukuthini lokhu kumlimi?
Ukuqonda le nqubo kuyingxenye yempi yokubamba ukuthi iyini i-PPF - futhi kufuna ikhono elincane lezibalo. Ungathembela kumathuluzi okulinganisa e-PPF atholakalayo emakethe ukuthi akusize, noma ungakhetha ukusebenzisana nozakwethu omethembayo ongakusiza wenze uhlelo lokukhanyisa oluhlangabezana nemfuneko yakho ngqo ekukuletheleni i-PAR ne-PPF efanele. I-PPF imane nje ingama-micromoles ngomzuzwana (µMol/S) - i-micromole eyodwa ingama-602 quadrillion photon.
I-PPFD (I-Photosynthetic Photon Flux Density)
Ingxenye yesithathu ye-PAR jigsaw yi-PPFD. Ikalwa ngama-micromoles ngemitha-skwele ngesekhondi (µMol/m2/S) futhi idlulela ngalé kokulinganisa i-PPF, futhi isungula ukuminyana kwama-photon awela endaweni ethile. I-PPFD imayelana nokuthi mangaki alawo abalulekile, ama-photosynthetic photons empeleni anomthelela endaweni ekhulayo nokuthi lezo zibani zisebenza kahle kangakanani uma kuziwa ekuphumeni kwazo.
Kusho ukuthini lokhu kumlimi?
Kubalulekile ukuqinisekisa ukuthi idatha ye-PPFD oyithola kumkhiqizi wakho wokukhanya okhulayo inembile futhi ihlanganisa yonke indawo yokukhanya. Kulula uma kuqhathaniswa ukubhucunga lolu lwazi, ngakho-ke cabangela izici ezifana nebanga ukusuka kumthombo wokukhanya, inani lezilinganiso ezenza isilinganiso, kanye nesilinganiso esincane/esiphezulu ngaphambi kokuthenga. Futhi, kufanelekile ukucabangela ukusebenza nochwepheshe othembekile bokukhula ongakunikeza amamethrikhi afanelekile namathuluzi afanele ukuze uzuze ngokugcwele ku-PAR, PPF, ne-PPFD.
Ukuze uthole ukwaziswa okwengeziwe:
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