Abstract
Abstract Soil temperature in GOSSYM, a cotton simulation model, is calculated in the TMPSOL subroutine, which is an empirical model. To validate TMPSOL, soil-temperature data were collected in the field for 2 years, at two locations (row and furrow) and four depths (5, 10, 25 and 60 cm) under bare and cotton cropped surface conditions. Under bare surface conditions, TMPSOL adequately predicted the average daily soil temperature only at the 5 and 10 cm depths of the row, and behaved irregularly in the furrow at those depths. At the 25 and 60 cm depths, TMPSOL underpredicted the soil temperatures in both row and furrow. Under cotton cropped surface conditions, before canopy closure, the results seemed to be similar to those of the bare surface conditions. After canopy closure, TMPSOL significantly overestimates the soil temperature at all locations and depths, sometimes by as much as 5°C. Implementation of a more mechanistic soil temperature model for GOSSYM is recommended.
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