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Proceedings Paper

Low-cost light-emitting-diode based leaf color meter for nitrogen status estimation in the rice field
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Paper 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.

Paper Details

Date Published: 15 November 2010
PDF: 8 pages
Proc. SPIE 7847, Optoelectronic Devices and Integration III, 784707 (15 November 2010); doi: 10.1117/12.870168
Show Author Affiliations
Sarun Sumriddetchkajorn, National Electronics & Computer Technology Ctr., National Science and Technology Development Agency (Thailand)
Yuttana Intaravanne, National Electronics & Computer Technology Ctr., National Science and Technology Development Agency (Thailand)


Published in SPIE Proceedings Vol. 7847:
Optoelectronic Devices and Integration III
Xuping Zhang; Hai Ming; Alan Xiaolong Wang, Editor(s)

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