Water as a limiting factor in wheat production at two areas in the Northern highlands of Tanzania.
1990
Modestus W.K. | McKeague J.A.
Data on soil water properties for five major soils in Northern Tanzania, including water content measured periodically through the growing season, and wheat crop rooting depth and distribution were assessed in relation to rainfall, wheat yields and calculated estimates of water use by the wheat crop. In 1987, water was retained within the rooting zone at pressures above -1500 KPa throughout the growing season in three of the five soils. In the Vertisol, however, the topsoil was dry at seeding and germination was poor. Early seeded wheat did not respond to irrigation at the one site tested, a deep Cumulic Haplustoll. In 1988, which was a drier year, water within the rooting zone was depleted below -1500 KPa in four of the five soils. Irrigation improved yields on the Cumulic Haplustoll. In average years with more than 600 mm of rainfall, achievable yields should be approximately double the current average of 1.6 t/ha. Factors other than lack of water that may limit wheat yields in the northern highlands of Tanzania are discussed.
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