Summary
The SWACRO simulation model was used to calculate water balances and associated potatotuber productions in a loamy sand soil with different types of compaction. Results for a noncompacted soil were compared with those for soils with a strong ploughpan and those with compacted surface soil. Input data consisted of: (1) measured hydraulic conductivity and moisture retention data for major soil horizons, (2) measured rooting depths and water-table levels, (3) calculated potential transpiration according to the modified Penman equation and (4) measured precipitation. Root extraction of water was simulated by two approaches, comparing the Feddes and Hoogland et al. extraction terms. The former procedure yielded best results in this study. The SWACRO model yielded good predictions of the soil water regime and tuber productions for the three treatments in the dry year 1976. A sensitivity analysis indicated that variations of water-use efficiencies did not significantly affect thedifferences in crop productions observed.
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Formerly: Soil Survey Institute, P.O. Box 98, 6700 AA Wageningen, the Netherlands.
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Feddes, R.A., De Graaf, M., Bouma, J. et al. Simulation of water use and production of potatoes as affected by soil compaction. Potato Res 31, 225–239 (1988). https://doi.org/10.1007/BF02365531
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DOI: https://doi.org/10.1007/BF02365531