Izinga le-nitrogen elilungile lezaqathi emikhakheni ethile lingase libe ngaphansi kakhulu kunezincomo ezamukelwa ngokuvamile. Lesi isiphetho esenziwe ososayensi baseNyuvesi yaseCalifornia ngokusekelwe emiphumeleni yocwaningo. Lolu lwazi lubalulekile uma kuqhathaniswa nesizinda sokukhuphuka kwamanani entengo kamanyolo wamaminerali emhlabeni wonke.
Abalimi abaningi be-carrot bafaka umanyolo we-nitrogen ngaphezulu kunalokho okudingekayo. Nakuba izaqathe zidinga izimo zokukhula ezikhethekile kanye nenani elanele le-nitrogen yamaminerali namanzi, okweqile akuzuzi isiko. Izaqathi zinezimpande ezijulile futhi ezinamagatsha, ngakho-ke ziyakwazi ukuthola initrogen eyinsalela yesizini edlule, engene yajula enhlabathini.
Izidingo ze-nitrogen zezaqathi ukuze uthole isivuno esihle sezimpande zincike esimweni sezulu, uhlobo lwenhlabathi kanye ne-nitrogen eyinsalela enhlabathini.
Izivuno ezincishisiwe zivame ukubonwa lapho kufakwa imithamo ephezulu yomanyolo we-nitrogen ngesikhathi sokutshala, ngakho-ke ukusetshenziswa komanyolo okhulula kancane kungcono ngokombono wokukhiqiza kanye nemvelo.
Ukunisela ngokweqile kubangela ukuguqulwa okuhlukahlukene kwezimpande ze-carrot, ngakho-ke, kuyadingeka ukulawula ngokucophelela ukuchelela ngesikhathi sokukhula. Nakuba ukuvundiswa kwe-nitrogen kungakhulisi kakhulu ukusetshenziswa kwamanzi ezitshalo ngenxa yokwanda kwendawo yamaqabunga, kwandisa kakhulu ukusebenza kahle kwamanzi kuze kufike ezingeni lokufaka i-nitrogen engu-120 kg ihektha ngalinye.
Ucwaningo olwenziwa ngososayensi baseMelika lubonise ukuthi isivuno esiphezulu sezitshalo zezimpande satholakala enhlabathini enesihlabathi kanye ne-loamy eno-75% wokuqukethwe komhlabathi womhlabathi ensimini kanye nokufaka u-150 kg we-nitrogen ehektheleni.
Ukuthathwa kwe-nitrogen kwizaqathi kuvame ukubaphansi ezinsukwini zokuqala ezingama-40-50, ngakho-ke abalimi bayelulekwa ukuthi banciphise ukuvundiswa kwabo ngalesi sikhathi. Nakuba ukuchelela njalo kunconywa ngesikhathi esifanayo, kuyadingeka ukulawula inani lamanzi ngokuchelela ngakunye ukuze kuncishiswe ukucwiliswa kwe-nitrogen esele. Phela igalelo lakhe lingaba likhulu, ikakhulukazi endaweni ye-monoculture.
Imiphumela yocwaningo yabonisa ukuthi inani elikhulu le-nitrogen lahlala eziqongweni zezaqathi ngesikhathi sokuvuna, okungenzeka libe nomthelela ekuqoqweni kwesilinganiso esingu-42-44% wesamba se-nitrogen esitshalweni (eziqongweni nasezimpandeni) ngesizini elandelayo.
Kunconywa ukuba njalo wenze ukuhlola kokuqala kokuqukethwe kwe-nitrogen enhlabathini kuze kufike ekujuleni okungama-60 cm bese kubalwa kabusha amazinga okufaka isicelo ngokusekelwe kulolu lwazi. Lo mkhuba uyithuluzi elihle kakhulu lokukhulisa isivuno kanye nokwenza ngcono izinga ngezindleko eziphansi zomnotho nezemvelo.