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Soil Reflectance Effects on Net Carbon Dioxide Exchange Rates of Sorghum¹

Net carbon dioxide exchange (NCE) rates of sorghum (Sorghum bicolor (L.) Moench) canopies were measured in the field using large plastic chambers and an infrared gas analyzer to assess the effect of soil reflectance on photosynthesis. Increasing soil reflectance, by applying white reflective clay, kaolinite, to the soil surface enclosed by the chambers, increased NCE by as much as 16% when crop cover was sparse. The effect decreased as crop coverage increased.

Spectral-reflectance data taken over kaolinite-treated and nontreated soil showed that reflected light over the treated plots decreased as crop cover increased so by 2 August treated and nontreated plots differed little in the amount of reflected light. Increases in NCE as calculated from spectral-reflectance data approximated measured values.

Key Words: Photosynthesis • Sorghum bicolor (L.) • Light interception • Transmittance

² Graduate research assistant and research micrometeorologist, respectively. Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506.

Received for publication May 29, 1975.