An experimental trial was carried out to determine the dry matter production ot wheats plants submetted to two level of water availability the cultivates used were: BH 1146 recomended for non irrigated areas and IAC-24 Tucuruí recomended for medium flooded areas. The experimental trial was carried out on a Latossolo Roxo (Eutrustox) and was fertilized with 20 kg of N and 90 kg of P2O5 per hectare. The plants were cuted and dried at the following stages: 10 days, at the begining of fillering; 30 days, at the stem alongation; 50 days at the joiting; 70 days, ate the flowering; 90 days, at the begining of grain formation and 110 days at the maturity of the grains. The authors concluded: The irrigation increased the dry matter production in both cultivates in all ages; Under dry land the cultivate IAC-24 Tucuruí showed the highest dry matter profuction; Under irrigation the cultivate IAC-24 Tucuruí showed the highest dry matter production.