Diurnal variation in net radiation depletion within a corn crop

✍ Scribed by John H. McCaughey; John A. Davies

• Book ID: 104630817
• Publisher: Springer
• Year: 1974
• Tongue: English
• Weight: 353 KB
• Volume: 5
• Category: Article
• ISSN: 0006-8314
• DOI: 10.1007/bf00123495

✦ Synopsis

The estimation of net radiation within a mature sweet corn canopy is examined using measurements of net radiation at one level above and three levels within the canopy during seven days in 1969. It is shown that Beer's Law, with a constant extinction coefficient, cannot be used to estimate hourly net radiation within the canopy. Functions of zenith angle and relative solar azimuth are incorporated into the model to account for the diurnal variation of optical density. These modifications, which are based on the characteristics of the crop, allow a constant extinction coefficient to be used to calculate hourly net radiation to an acceptable level of accuracy.