This paper presents the behaviour of three wheat cultivara (CNT 8, IAC 17 and BH-1146) at eight seeding times (the first seeding time was from 1st to 10th of March and the last one from to 20th to 30th of May) in experiments carried out at Canadá Farm, Assis, State of Sáo Paulo, Brazil, in the period 1978-1982. Grain yield and plant heigth were evaluated for each seeding time, in each experiment. Soil water availability was obtained by water balances taken at each ten days considering 125mm as the soil water retention capacity. The results showed that the seeding time from 20th of March to 10th of April was the best considering grain yield, independently of the cultivar. The results also indicated that the others studied seeding times were not favourable to seed wheat in this region. The wheat cultivar CNT 8 was the most productive, independently of the year and the seeding time. Considering the years under study it was observed that in 1979, the three evaluated cultivars exhibited the highest grain yield due meanly to the climatic conditions which was favourable to the crop.
wheat; CNT-8, IAC-17 and BH-1146 cultivars; grain yield; plant height; seeding times; water balance