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Observed and Predicted Two‐Dimensional Soil Temperature Distributions Under a Row Crop
Author(s) -
Horton R.,
AguirreLuna O.,
Wierenga P. J.
Publication year - 1984
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1984.03615995004800050039x
Subject(s) - noon , soil thermal properties , soil science , environmental science , thermal conduction , heat flux , soil horizon , heat transfer , soil water , atmospheric sciences , materials science , geology , mechanics , field capacity , physics , composite material
A two‐dimensional soil heat transfer model was developed to compute the soil temperature distribution between rows of crops which partially shaded the soil surface. The model is based on an explicit solution, using CSMP, of the heat conduction equation and allows for time and space dependence of soil thermal properties. Measured soil temperatures were taken as input for the upper boundary. Computed temperature distributions were compared with temperatures measured below a trickle irrigated row crop, which only partially shaded the soil. There was a large variation in the surface and near surface soil temperatures with distance from the row. Ranges of the daily surface soil temperature waves were about 5°C directly below the crop and about 40°C between two crop rows. Around noon the horizontal soil heat flux in the upper soil profile was much greater than the soil heat flux in the vertical direction. Better agreement was obtained between measured soil temperatures and predicted soil temperatures when horizontal heat flux was taken into account.