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15 November 2010 Low-cost light-emitting-diode based leaf color meter for nitrogen status estimation in the rice field
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Abstract
Nitrogen status is an important factor for evaluating the growth of rice or the amount of nitrogen fertilizers needed per rice field. It can be done easily and cheaply by using a leaf color chart. However, the accuracy of the resulting color level depends on the ability of the farmer to compare the leaf color with the reference chart as well as on the direction of Sun light. With this issue in mind, this paper proposes a low-cost light-emitting-diode (LED) based leaf color meter that can be used to estimate the nitrogen level needed in the rice field. In particular, we show how we integrate an off-the-shelf green 562-nm wavelength LED, a silicon photodiode, an 8-bit microcontroller, and a 6×1 LED panel in a compact packaging style for the implementation of this needed leaf color analyzer. The total cost is only USD39. Field test results confirm that key leaf color levels of 2, 3, and 4 can be identified. Other key features are ease of use and upgradability for different color levels.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sarun Sumriddetchkajorn and Yuttana Intaravanne "Low-cost light-emitting-diode based leaf color meter for nitrogen status estimation in the rice field", Proc. SPIE 7847, Optoelectronic Devices and Integration III, 784707 (15 November 2010); https://doi.org/10.1117/12.870168
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