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Performance of the SunScan canopy analysis system in estimating leaf area index of maize.
- Source :
-
Agricultural Engineering International: CIGR Journal . 2012, Vol. 14 Issue 3, p1-7. 7p. - Publication Year :
- 2012
-
Abstract
- Rapid and reliable estimates of leaf area index (LAI) are important for studies of exchanges of energy and gases in the biosphere-atmosphere continuum. This paper evaluates the field performance of SunScan canopy analysis system for rapid estimation of LAI. Direct and indirect measurements of LAI were made in a maize (Zea mays L.) field at four phenological stages (emergence, vegetative, flowering and physiological maturity) at a tropical site in Ghana during the Glowa Vota Project field campaign (www.glowa-volta.de). Similar measurements were repeated in early and late planting seasons with similar crop management practices. The result showed a generally good performance of this sensor at all the phenological stages. Average LAI from the sensor (LAIS), ranged from 0.40-4.45, and was consistently higher than the actual LAI, which varied from 0.31-4.22, respectively for both seasons. Regression between LAI and LAIS showed a range of significant correlations with R² > 0.74 for all the stages and seasons. With combined datasets for all stages and the two plantings, a simple regression model was fitted to estimate LAI from LAIS with R² = 0.97 and standard error of 0.23 (P < 0.0001). The evaluated sensor yielded a good and reliable LAI estimates under maize canopy. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16821130
- Volume :
- 14
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Agricultural Engineering International: CIGR Journal
- Publication Type :
- Academic Journal
- Accession number :
- 87526272