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Title: Determining pasture evapotranspiration using active optical sensor derived normalized difference vegetation index
Contributor(s): Alam, Muhammad S (author); Lamb, David  (author); Rahman, Muhammad Moshiur  (author)orcid ; Bradbury, Ronald  (author); McCarthy, Cheryl (author)
Publication Date: 2017
Open Access: Yes
DOI: 10.5281/zenodo.897037Open Access Link
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Open Access Link: Access Link
Abstract: Actual evapotranspiration (ETc) is one of the important parameters that determines the daily and seasonal water requirement by the crop community. It varies with numerous factors including weather, soil moisture availability and other crop related factors such as growing stage, fraction of field coverage and crop vigour. In this study we investigated the relationship between normalized difference vegetation index (NDVI) that is closely related to photosynthetically-active biomass (PAB) and the evapotranspiration of pasture at different soil moisture condition. A portable enclosed chamber was used to measure ETc of a target pasture canopy and consequently the NDVI with a hand held active optical sensor. The portable chamber was calibrated in the laboratory and produced a calibration factor of C=1.02. Field experiments were conducted on the UNE SMART Farm in Tall Fescue pastures (Festuca arundinacea var. Dovey). Under limiting soil moisture condition the relationship between NDVI and ETc showed a negative correlation (R2=0.73) whereas a strong and positive correlation (R2=0.82) were observed in a non-limiting soil moisture condition.
Publication Type: Conference Publication
Conference Name: 1st Asian-Australasian Conference on Precision Patures and Livestock Farming, Hamilton, New Zealand, 16th - 18th October, 2017
Conference Details: 1st Asian-Australasian Conference on Precision Patures and Livestock Farming, Hamilton, New Zealand, 16th - 18th October, 2017
Source of Publication: Preparing the digital future of livestock farming Proceedings of the 1st Asian-Australasian Conference on Precision Pastures and Livestock Farming, p. 1-7
Publisher: Precision Agriculture Association New Zealand
Place of Publication: Hamilton, New Zealand
Field of Research (FOR): 070304 Crop and Pasture Biomass and Bioproducts
099902 Engineering Instrumentation
099901 Agricultural Engineering
Socio-Economic Outcome Codes: 830404 Non-Cereal Crops for Hay
830403 Native and Residual Pastures
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
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Appears in Collections:Conference Publication
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