Short‐wave reflection coefficient for a field of maize

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Abstract
Hourly and daily determinations of the reflection coefficient for a field of maize (Zea mays) were made on 17 days from July to September 1958. An Eppley pyrheliometer was used to measure incident solar radiation and a Kipp solarimeter was used to measure reflected radiation. The hourly determinations showed increased reflection at low solar altitudes. With a moist soil, the reflection coefficient based on the daily radiation was 0·12 to 0·15 when the plants were small and 0·17 to 0·19 when the crop was fully developed. When the soil surface was dry and the plants small, the coefficient was 0·21. Tassel formation and freezing of the plants had no effect on reflection.

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