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Validation of the Soil Temperature Subroutine HEAT in the Cotton Simulation Model GOSSYM

Dep. of Plant and Soil Sciences, Mississippi State Univ., Mississippi State, MS 39762

Govinda Weerakkody and Frank D. Whisler^*

Dep. of Mathematics and Statistics, Mississippi State Univ., Mississippi State, MS 39762
Dep. of Plant and Soil Sciences, Mississippi State Univ., Mississippi State, MS 39762

^* Corresponding author (fwhisler{at}pss.msstate.edu).

The empirical soil temperature subroutine of the cotton simulation model GOSSYM did not perform well under bare and cotton-cropped (Gossypium hirsutum L.) surface conditions in the field. Therefore, it was replaced by a mechanistic soil temperature subroutine called HEAT. The HEAT subroutine was validated against soil temperature data collected in the field under bare and cotton-cropped surface conditions, and was compared with the empirical TMPSOL subroutine of GOSSYM. Soil temperatures were collected in the field under bare and cotton-cropped surface conditions at two locations (row and furrow) and four depths (5, 10, 25, and 60 cm) during the growing seasons of 1991 and 1992. Under bare surface conditions, HEAT underpredicted the average daily soil temperatures by 1 to 7°C at all locations and depths. However, under cotton-cropped surface conditions, HEAT calculated the soil temperature adequately, especially after canopy closure. Under bare surface conditions, the temperatures calculated by TMPSOL were closer to the measured values than those calculated by HEAT, but were still beyond the standard deviations of the measured values. It is recommended that the TMPSOL subroutine in GOSSYM be replaced by the HEAT subroutine.

Received for publication June 23, 1994.

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