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Short‐wave reflection coefficient for a field of maize
Author(s) -
Graham W. G.,
King K. M.
Publication year - 1961
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49708737313
Subject(s) - tassel , reflection (computer programming) , environmental science , reflection coefficient , radiation , zea mays , atmospheric sciences , field experiment , agronomy , optics , geology , physics , biology , computer science , programming language
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.