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Fig. 3. Diurnal trend in soil temperature, air temperature, and photosynthetically active radiation (PAR) on 24 June 1999 near Morris, MN. Soil temperature was measured at a depth of 1 cm in the intrarow (dashed lines) and interrow (solid lines) of corn sown in 0.38-, 0.57-, and 0.76-m rows.
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