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- W2171081911 abstract "Water stress has been considered to be the primary constraint to yield in water-limited arid and semi-arid environments. This paper describes the characterisation of the rainfall season using relative transpiration (T rel ) of a maize crop at 13 climate stations in Zimbabwe. A soil water balance model was used to simulate relative crop transpiration for a maize crop over the duration of each rainfall season to assess its quality (severity of intraseasonal dry spells). The T rel and length of growing period (LGP) were subjected to frequency analyses and the results were interpolated (kriging) to form a GIS library of expected events in normal, wet and dry years. The normal LGP (50% PE) varied across the stations, with a range of 75 days, exposing opportunities for objective management of variety selection to match crop growth cycles to expected LGP. The time series of T rel showed the time variation of quality of the season with periods of high T rel identifying the high quality parts of the rainfall season suitable for crop production. Soil depth influenced quality of the season, with deeper soils improving quality. A simple tool that can be used to indicate whether or not to grow maize varieties of particular length of growth cycle in a specified region for typical wet, normal or dry rainfall seasons was developed. Keywords: GIS, kriging, soil water balance African Crop Science Journal , Vol. 20, No. 1, pp. 47 - 57" @default.
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- W2171081911 date "2012-01-01" @default.
- W2171081911 modified "2023-09-26" @default.
- W2171081911 title "RELATIVE TRANSPIRATION AS A DECISION TOOL IN CROP MANAGEMENT: A CASE FOR RAINFED MAIZE IN ZIMBABWE" @default.
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