Pofuna kukula ndi kukula kwa mbewu iliyonse imakhala ndi zakudya zambiri komanso zakudya zambiri, zomwe zimakhala potaziyamu, phosphorous, nayitrogeni ndi silicon. Kufunika kwake kwa silicon nthawi zambiri sikunayesedwe, ngakhale kuti zakhazikitsidwa kuti pakapita patsogolo, zomera zimaphatikizapo kuchuluka kwa silicon m'nthaka, chifukwa chakuti malo atsopano omwe amachoka panthaka yowonjezereka ikukula kwambiri ndipo nthawi zambiri amavulazidwa.
