Frost response in wheat and early detection using proximal sensors
Autor: | Audrey Delahunty, Kirsten Barlow, J. G. Nuttall, Garry O'Leary, Ashley J. Wallace, Eileen M. Perry |
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Rok vydání: | 2018 |
Předmět: |
0106 biological sciences
food and beverages Early detection 04 agricultural and veterinary sciences Plant Science 01 natural sciences Reflectivity eye diseases Normalized Difference Vegetation Index Crop Anthesis Agronomy Yield (wine) Frost 040103 agronomy & agriculture Dry ice 0401 agriculture forestry and fisheries Environmental science Agronomy and Crop Science 010606 plant biology & botany |
Zdroj: | Journal of Agronomy and Crop Science. 205:220-234 |
ISSN: | 1439-037X 0931-2250 |
Popis: | Frost can significantly reduce production of field crops grown in Mediterranean-type environments, where significant economic losses for Australian wheat occur annually. If non-destructive sensors could make rapid, spatial assessment of frost damage, this could limit economic losses through timely management decisions. This paper reports on a methodology for imposing frost treatments to wheat under field conditions and the utility of canopy reflectance data for detecting early crop damage. Purpose-built chambers using stepped additions of dry ice allowed for a range of frost scenarios to be tested when applied at wheat heading and anthesis. For frost treatments applied at anthesis, grain number and yield were reduced by 8.8% and 7.2%, respectively, for every degree Celsius below zero (down to −4°C). This effect was additive over two consecutive nights. For cold load equivalent, there was a 2.2% and 1.9% reduction in grain number and yield, respectively, per °C hr (below 0°C). For wheat, spectral indices PRI and NDVI (reflectance) and FRF_G and SFR_G (fluorescence) showed significant relationships, with cold load applied for heading treatments. Next steps include targeting frost intensities equivalent to cold loads between 20 and 80°C hr and testing the utility of these proposed indices in a commercial paddock setting. |
Databáze: | OpenAIRE |
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