Solar radiation regime in three cassava (Manihot esculenta Crantz) canopies
✍ Scribed by Antonio Roberto Pereira; Eduardo Caruso Machado; Marcelo Bento Paes de Camargo
- Publisher
- Elsevier Science
- Year
- 1982
- Weight
- 542 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0002-1571
No coin nor oath required. For personal study only.
✦ Synopsis
For solar elevation greater than 20 ° and clear sky conditions, the near infrared (NIR) and photosynthetically-active radiation (PAR) were, respectively, 0.54 and 0.46 of the incoming solar radiation.
During the period of maximum leaf area index (LAI), plant structure had no apparent effect upon the crop reflection, transmission and absorption coefficients which were, however, functions of solar elevation. NIR was always more reflected and transmitted but less absorbed than PAR regardless of the plant structure.
For the wavebands considered the following radiometric relations were, in general, obtained: (1) incoming radiation, IPAR =-0.85 INIR; (2) reflected radiation, RPAR = 0.07 RNIR; (3) net solar radiation, NPAR ----1.29 NNIR; (4) transmitted radiation, TPAR ----0.5 TNIR.