Irrigated maize response under limited water supply.
1994
Craciun I. | Craciun M.
Limited irrigation-applying less water than is required to meet potential evapotranspiration - is extensively practised on the drought tolerant crops of grain sorghum, wheat and cotton. The purpose of this paper is to present the effect of water deficit of growth, yield and water use efficiency (WUE) of 10 genotypes of maize. Seasonal evapotranspiration (ET), yield and water use efficiency by well irrigated treatment ranged from 304 mm to 649 mm, from 7604 kg/ha to 14291 kg/ha and from 14.5 kg/ha to 40.1 kg/mm, respectively. Water deficit reduced seasonal ET, grain yield and water use efficiency by 0 to 40 percent, by 0 to 92 percent and respectively by 24.5 kg/mm to 3.1 kg/mm. Yield response factor - Ky (the relationship between relative yield decrease and relative evapotranspiration deficit) ranged from 0.2 (in a wet year) to 2.6 (in a dry year) in dryland treatment, related to climatic conditions and genotypes.
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