Stevia (Stevia rebaudiana) yatchuka ngati njira yotsekemera chifukwa imakhala ndi ma glycosides omwe amakhala okoma mpaka 300 kuposa shuga woyera. M'madera otentha (USDA zones 9-11), ndi zitsamba zosatha, koma sizidzadutsa m'madera omwe ali ndi nyengo yozizira kwambiri komanso m'madera amenewo, amachitidwa ngati pachaka. Gulu lotsogozedwa ndi Dr. David Shew waku North Carolina State University lidachita mayeso ochulukirapo kuti afufuze ntchito yake ngati mbewu ina. NC State ilinso pulogalamu yoweta yomwe ikupanga mbewu zatsopano
koyenera ku nyengo yachilimwe yotentha komanso yachinyezi yomwe ili ku Southern US
Zomera zonse zimakhala ndi pH yokwanira bwino yomwe mbewu zimavutikira. Pamalo okwera a pH, zakudya monga Fe, manganese (Mn), zinki (Zn), ndi mkuwa (Cu) sizipezeka ku mbewu. Nthawi zambiri zomera zomwe zimakhala ndi pH yotsika kwambiri zimakhala ndi zizindikiro za Fe-deficiency. Iron ndi chinthu chosasunthika m'nthaka ndipo zotsatira zake sizingasunthidwe kuchokera kumasamba otsika kuti zikwaniritse zosowa za mbewu m'zigawo zatsopano zomwe zikukula.
Choncho, poyesera kuti azindikire kuperewera kwa Fe-ndikofunikira kuwerengera malo a symptomology kuti athandize kuthetsa kuperewera kwa zakudya zina. Pankhani ya stevia, zomera kumtunda mbali akusonyeza chikasu ndi intervein chlorosis (mkuyu. 3). Choncho, ndi
kuphatikizika kwa malo azizindikiro, ndi gawo lapansi lamchere pH limayamikira chomwe chimayambitsa interveinal chlorosis ndi Fe-kusowa chifukwa cha kuchuluka kwa pH ya gawo lapansi.
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