Kunconywa ukuthi abalimi be-canola basebenzise abalawuli bokukhula kwezitshalo (ama-PGR) ezitshalweni ze-canola ezikhula ngokushesha ukuze kwandiswe isivuno kanye nokuqina kwezitshalo.
Kuleli hlobo, izitshalo azifani nje ngobukhulu, kodwa futhi nangezigaba zokukhula: kusukela ezitshalweni ezinamahlamvu ayisithupha eqiniso kuya ezitshalweni ezinama-cotyledons kuphela.
Ngakho-ke, ukuphathwa kuzoba nzima kakhulu futhi kuzodinga indlela ethile yesayithi,” kusho uNigel Scott, umphathi wezobuchwepheshe wesifunda eProcam.
Naphezu kokungathandi kwabalimi ukutshala imali, abanye baphuthelwa isivuno esikhulu ehlobo eledlule ngenxa yokungatshalwa kwezimali kanye nesivuno esibi ngesizini edlule.
Pho kungani osochwepheshe bezolimo bebika isivuno esingaguquguquki kangaka? Uma sibheka emuva eminyakeni eyishumi edlule, uNigel ukhomba ukuthi usuku lokuhlwanyela olujwayelekile luyisonto lesithathu lika-Agasti.
Kodwa-ke, ngenxa yosongo oluvela kuma-cabbage stem flea beetle, izinsuku zokuhlwanyela zasuswa kusenesikhathi noma zahlehliswa ukuze kugwenywe isimo lapho isivuno sisesigabeni se-cotyledon lapho kuvela ama-flea beetle amadala ekupheleni kuka-Agasti.
Kulo nyaka, ukuhlwanyela kuqediwe ngaphambilini kwezinye izindawo. Wakhomba esifundeni sakhe, iDurham, lapho, njengezinye izingxenye zaseNgilandi, ukuvuna kuqediwe ngaphambi kwesikhathi esibekiwe.
Izitshalo ezithola amanzi zikhula ngokushesha. Kodwa-ke, ezindaweni lapho kungekho khona amanzi noma inhlabathi eyomile, isikhathi sokuhluma siyanda.
Ngakho-ke, ukukhula kwezitshalo kuyahlukahluka kuye ngokutholakala kwamanzi; ezinye izitshalo zikhula amaqabunga amane, amahlanu, noma ayisithupha eqiniso, kanti ezinye zikhula ama-cotyledon kuphela.
Iqoqo lokugcina lezitshalo ezitshalwe ngemva kokufuduka kukaSepthemba kuze kube manje selikhiqize iqabunga elilodwa kuphela leqiniso. Okukhathazayo ukuthi uNigel useqalile ukuqaphela inani elikhulu lezinambuzane ezindala.
"Ngakho-ke, ngisho nasensimini efanayo, sibone izitshalo ezigabeni ezintathu ezahlukene zokukhula."
Ezitshalweni ezivuthwa kusenesikhathi, abalimi bakhe bahlela ukusebenzisa abalawuli bokukhula kwezitshalo—into abangazange bayenze isikhathi eside.
Uqaphele ukuthi abalimi kudingeka basebenzise abalawuli bokukhula kwezitshalo (ama-PGR) manje ukuze bandise ukusebenza kwabo kungakephuzi kakhulu.
Okungcono kakhulu, lo manyolo kufanele usetshenziswe lapho isitshalo sinamaqabunga amane kuya kwayisithupha eqiniso (phakathi no-Okthoba). Abalawuli bokukhula bangacindezela ukukhula kwezingxenye ezingaphezulu komhlabathi futhi bakhuthaze ukuhluma kwezimpande (bheka umdwebo).
Lokhu kuchazwa iqiniso lokuthi uma i-petiole ikhula isikhathi eside, ingozi yokuthi lesi sifo sisabalale esiqwini iyancipha.
"Le nkinga ivame kakhulu emasimini amancane aphathwe ngemithi yokubulala isikhunta efana ne-difenoconazole."
Ekugcineni, weluleka ukufaka umquba ezitshalweni ezikhula kancane ngoba amazinga okushisa enhlabathi azokwehla futhi kuzodingeka ziqongelele i-biomass zilungiselela ubusika.
"Ngisho nezitshalo ezivuthiwe zidinga izakhamzimba ezithile, ikakhulukazi i-manganese ne-boron, ukuze zikhiqize isivuno esiphezulu."
Enye yezinselelo ezinkulu kule ntwasahlobo ukunquma isikhathi esifanele sokusebenzisa i-clethodim ukulawula ukhula, uma kubhekwa izinhlobo eziningi zezitshalo ezitshaliwe.
Ukufaka izibulala-zinambuzane ngesikhathi kuyinselele ngoba kungalimaza izindawo ezinkulu zezitshalo. “Ngakho-ke, abalimi kudingeka banake kakhulu isikhathi sokufaka,” kusho uNigel.
Uphinde asikisele ukuthi amazinga e-nitrogen asele enhlabathini ngenxa yesomiso sasehlobo akhuthaza ukukhula kwezitshalo. Ukwenyuka kwamazinga okushisa enhlabathi nakho kusho ukwanda kwamaminerali.
"I-Buckwheat ikhula ibe yinde kune-rapeseed, futhi ngenxa yokuncintisana phakathi kwezitshalo, iphinde ithathe indawo ye-rapeseed. Ngaphandle kwe-buckwheat, i-rapeseed ibingeke ikhule ibe yinde kangaka."
Isikhathi sokuthunyelwe: Mashi-09-2026