Development of canopy green measurement technology for paddy rice, 1: Measurement system and its performance
2006
Omine, M.(National Agricultural Research Center, Joetsu, Niigata (Japan). Hokuriku Research Center) | ; Shibata, Y. | ; Toriyama, K. | ; Sasaki, R. | ; Chosa, T. | ; Yasuda, N.
The 'Canopy Green Measurement System' was developed for remote sensing of canopy spectrum. This system consists of a computer for logging data and analysis and an improvised Canopy Green Meter that uses two wavelengths (550 and 800 nm), and can measure canopy green index at 0.7 s intervals continuously over a wide area. One person can operate this system. The suitable measurement conditions are 5 m distance, 1.6 m height, brighter than 50,000 lx, and order light. The canopy green index is closely correlated (r0.93) with the SPAD value, nitrogen content, and amount of dry matter, and can be used to evaluate the state of nitrogen nutrition. This system is more efficient than SPAD Chlorophyll meter and is a useful sensing technology for growth information.
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