Irrigation depths for wheat (Triticum aestivum L.) cultivars cropped in South region of Minas Gerais state / LÃminas de irrigaÃÃo para cultivares de trigo irrigado (Triticum aestivum L.) no Sul de Minas Gerais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The Brazilian wheat production in 2005 was 4,66 Mt, and the consumption was 10,21 Mt, which makes necessary for the country to import wheat (IBGE, 2006). The national average yield is 1975 kg/ha, and the state of Minas Gerais has an average yield of 3503 kg/ha. The state production was 23,54 thousand t, harvested in an area of 6,72 thousand ha (CONAB, 2006). All wheat grown in Minas Gerais is irrigated and this culture has high yield potential. The objective of this research was to investigate the optimal water supply for two wheat cultivars in the southern region of Minas Gerais. The experiment was conducted in 2005, in the Experimental Field of the Agriculture Department of the Federal University of Lavras, using randomized complete blocks with split plot design, with two wheat cultivars (Pioneiro and Embrapa 22) and a line source sprinkler system. The results show the small influence of the water supply over the bloom phase and cycle of the common wheat. The yield showed the superiority of âEmbrapa 22â (with an average yield of 2154 kg/ha) over the âPioneiroâ (with an average yield of 1597 kg/ha). The water use efficiency had the same characteristics as the yield behavior; the âEmbrapa 22â was superior to the âPioneiroâ, with an average water use efficiency of 7,11 kg/ha/mm and 5,27 kg/ha/mm, respectively. For both appraised parameters (yield and water use efficiency) an increase in the water supply led to an increase in these parameters in a linear fashion. Finally, the maximum water supply in this experiment (L9: 344,0 mm) represented the maximum yield for the cultivars, 2461 kg/ha for the âPioneiroâ and 2889 kg/ha for the âEmbrapa 22â. This demonstrates the cultivars differences in relation to the water supply.

ASSUNTO(S)

aspersores em linha yield fitotecnia wheat production produtividade line source triticultura

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