Although it is very cost effective (e.g., USD1) and it is easy to use, the color separation ability of the farmer and the direction of sun light are two major concerns that cause the incorrect visual reading of the color level from the LCC, thus leading to the improper application of N fertilizers. To alleviate this problem, we introduce a low-cost single-wavelength based rice leaf
color analyzer for use as an N status estimator in rice fields.