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The aim of this article is to design a key device for the management of Nitrogen (N) concentration in the crops for an effective yield. In leaves, the chlorophyll content is estimated through the chlorophyll meter which detects the optical signal (light) between the wavelengths 450 nm and 950 nm. The received optical light in each wavelengths are determined. Chlorophyll takes 425-450 nm optical signals and consequently, the acquired of the wavelengths penetrating through the leaves is diminished if it is compared with the reception of 650-670 nm light. The light of 950 nm wavelength is uninterrupted due to chlorophyll level in the leaves and the received light acts as an indicator to determine the hairy or waxy presence on the surface of the leaves. In the test field, major methods find out the collection of N status, processing, soil analysis and the samples of plant tissue but with the help of handy chlorophyll meter, the level of chlorophyll as well the N availability can be predicted on several crops. By using an 8 bit microcontroller, light emitting diode, photo diode and amplifier, the leaf chlorophyll content has been measured for different crops like turmeric, sugar cane and plantain etc. Field measurement manifests nitrogen content in terms of percentage as shown in 6 levels of Leaf Colour Chart (LCC). And also infers that chlorophyll absorbs more at 425-450 nm than 650-670 nm light.

Multi-crop Chlorophyll Meter System Design for Effective Fertilization