Modelling soil-water-plant relationships in the Cerrado soils of Brazil: The case of maize (Zea mays L.) |
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| Authors: | Joseph B Goodwin Fernando L Garagorry Waldo Espinosa Luis Marcelo Sans Leif J Youngdahl |
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| Institution: | 1. USAID, Dar es Salaam, Tanzania;2. Department of Quantitative Methods, EMBRAPA, Brasilia, D.F., Brazil;3. Cerrado Research Center, EMBRAPA, Planaltina, D.F., Brazil;4. National Corn and Sorghum Research Center, Sete Lagoas, M.G., Brazil;5. International Fertilizer Development Center, Muscle Shoals, Alabama, USA |
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| Abstract: | A soil-water balance simulation model developed for the Cerrado soils of central Brazil is presented. The model calculates daily soil water evaporation, plant transpiration and soil-water balance for fourteen soil layers of 15 mm each. The model includes a subroutine to calculate capillary water movement. Computer simulations of daily soil water levels at five soil depths (15, 30, 45, 60 and 90 cm) for a field of maize are compared with actual field measurements over an 80-day period. Results indicated that the developed model can, in general, estimate the soil-water balance of the various depths within ± 10% of actual measurements. |
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