Abstract
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.
Highlights
High Chlorophyll, a green photosynthetic pigment that helps plants to get energy from sunlight plays a major role in increasing the yield of crops
Though there are several methods available in literature to measure the chlorophyll content in plants, chlorophyll meter is considered as one of the effective methods to calculate the quantity of Nitrogen (N) fertilizer wanted for paddy crops
A single wavelength of 562 nm peak value is used to transmit towards the surface of leaf by using green LED and the light which scattered at a specific angle is received by photo detector and the received wave is processed by PIC Microcontroller and produces any one of the 6 different contrast of green colors as output (LED) based on the available chlorophyll content in corresponding leaf as discussed in Sumriddetchkajorn and Intaravanne (2010, 2014)
Summary
High Chlorophyll, a green photosynthetic pigment that helps plants to get energy from sunlight plays a major role in increasing the yield of crops. LCCs are being used in most of the areas with certain regulations to cultivate desired and required rice breeds as described in Islam et al (2007) In an another method, a single wavelength of 562 nm peak value is used to transmit towards the surface of leaf by using green LED and the light which scattered at a specific angle is received by photo detector and the received wave is processed by PIC Microcontroller and produces any one of the 6 different contrast of green colors as output (LED) based on the available chlorophyll content in corresponding leaf as discussed in Sumriddetchkajorn and Intaravanne (2010, 2014). This study overcomes the above mentioned limitation in a way that this approach can be effectively applied to more than one crop
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