UMary Allen
Irayisi lukhozo olufana nengqolowa, irhasi, umbona, nezinye ezininzi. Ziziinkozo zeentlobo ezithile zezityalo. Ekuqaleni yayizingca eziswiti. Ukususela kwi-Stone Age, abantu baye bahlala begcina iinkozo ezinkulu kude kube yintwasahlobo elandelayo kwaye basebenzise kwakhona ukuhlwayela. Kwavela ngolu hlobo ukutya okuziinkozo, kuquka nerayisi.
Izityalo zerayisi ezincinci kufuneka zombiwe kwaye ziphinde zityalwe ibe nye ngexesha kwaye kugqalwe izithuba ezininzi. Isityalo serayisi siye sibe malunga nesiqingatha semitha okanye enye enesiqingatha ukuphakama. Phezulu kukho i-panicle, i-inflorescence. Emva kokuchunyiswa ngumoya, iinkozo ziyakhula. Nasiphi na isityalo serayisi sinokuzichumisa ngokwaso.
I-Archaeology ifumene ukuba irayisi yayisele ilinywa malunga ne-10,000 kwiminyaka edlulileyo: e-China. Isityalo mhlawumbi safika entshona ngaphaya kwePersi, i-Iran yamandulo. AmaRoma amandulo ayesazi irayisi njengeyeza. Kamva, abantu beza nerayisi eMerika naseOstreliya.
Malunga nesiqingatha sabo bonke abantu, irayisi kokona kutya kubalulekileyo. Yiyo loo nto ikwabizwa ngokuba kukutya okusisiseko. Abantu ekusebenza kubo oku bahlala ikakhulu eAsia. Ininzi yerayisi iyalinywa eAfrika. Kwelinye icala, eNtshona, abantu badla ngokutya ukutya okwenziwe ngengqolowa. Nangona umbona ulinywa kakhulu kunerayisi, utyiswa kakhulu kwizilwanyana.