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Articles by W.D. Joshua
Total Records ( 1 ) for W.D. Joshua
  N. Persaud , G. Hassan , W.D. Joshua and D. Lesolle
  The purpose of this study was to use mechanistic modeling of soil-plant-atmosphere hydraulics to develop quantitative measures of post-establishment agricultural drought for subsistence sorghum production under soil and rainfall conditions typical of semi-arid Eastern Botswana. Daily AET/PET ratios were calculated for 120 days following each of 15 growing period start dates over 9 growing seasons (1981/82 through 1989/90). The resulting series for each start date were used to calculate values for the total occurrences when AET/PET ≤ 0.3 for 2, 4 and 6 consecutive days and values of agricultural drought days using baseline AET/PET ratios reported in the literature. These two agricultural drought measures were compared over 3 the high-rainfall seasons (1983/84 to 1985/86) and 3 low rainfall seasons (1987/88 to 1989/90) for the 15 start dates. The mean occurrences when AET/PET ≤ 0.3 over the dry seasons were markedly higher and tended to be more variable for all growing period start dates. The mean occurrences for the 3 dry seasons showed the same pattern over the 15 start dates for all durations, but the values decreased with increasing duration in a non-linear manner. The same was true for the wet season occurrences. Agricultural drought day means were always < 0 and were more negative for the dry seasons for all start dates. Although the patterns for all measures contained low mean values, there were no well-defined minima for either the dry or wet seasons.
 
 
 
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