1 / 20

An Optical Sensor for Analysis of Soil Nutrients by Using LED Light Sources

An Optical Sensor for Analysis of Soil Nutrients by Using LED Light Sources. Arvind Kumar Prof. B.B.Tiwari Scientist B’ IIIT-A Discovery Park Indian Institute of Information Technology, Allahabad. Abstract .

indiya
Download Presentation

An Optical Sensor for Analysis of Soil Nutrients by Using LED Light Sources

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. An Optical Sensor for Analysis of Soil Nutrients by Using LED Light Sources Arvind KumarProf. B.B.Tiwari Scientist B’ IIIT-A Discovery Park Indian Institute of Information Technology, Allahabad

  2. Abstract • A compact optical sensor based on photometric detection of soil nutrients is proposed. The sensor consists of three light emitting diodes (LEDs) and a simple data I/O circuit using a PIC (peripheral interface controller) device. The wavelength of LEDs is chosen to lit the absorption band of chemical reagents whose colour develops by reaction with soil nutrients. • The sensor is applied for detection of six soil nutrients: ammonia nitrogen (NHr-N), nitrate nitrogen (NOs-N), available phosphorus (PaOs), available iron (Fe), exchangeable manganese (Mn) and exchangeable calcium (CaO) from colour changes caused by addition of chemical reagent in a transparent plastic cell . • .

  3. Continue… • The results are compared with those calculated using absorbance of solutions measured by spectrophotometer and good agreement is observed. The resolution of 1.0-20 mg/100 g has been reported for standard solutions of soil nutrients in a cell of 5.5 mm in path length. • The sensor is also applied to an analysis of soil nutrients of various farmlands, and the results are compared with those obtained by a colour chart judgment

  4. Introduction • To decide the wavelength of LED for the sensor, absorption spectra of colour-developed standard solutions with various contents as listed in Table 1 are proposed. • A commercially available soil analyser that provides the colour-developing reagents for the six soil nutrients may be used for the analysis. • The absorbance of each colour-developed solution in a fused silica cell with a path length of 10 mm is measured over the wavelength range from 350 nm to 1000 nni. • The absorbance A is obtained as: A = Iog10(Iin/Iout) where Iinis the incident light intensity and Ioutis the intensify after passing through the cell.

  5. Soil provides Support and nutrients for plant growth

  6. Soils and plant nutrients • Soils and soil texture • Soil texture triangle • Plant nutrients • Major nutrients • Secondary nutrients • Minor nutrients • Exchange • Capacity (CEC) • Soil pH

  7. Plants Acquire Nutrients From Air And Water Carbon Hydrogen Oxygen

  8. The Primary Nutrients Nitrogen Potassium Phosphorus

  9. The Secondary Nutrients Calcium Magnesium Sulfur

  10. The Micronutrients • Boron • Chlorine • Copper • Iron • Manganese • Molybdenum • Zinc

  11. The 16 Essential Nutrients • Boron • Calcium • Carbon • Chlorine • Copper • Hydrogen • Iron • Magnesium • Manganese • Molybdenum • Nitrogen • Oxygen • Phosphorus • Potassium • Sulfur • Zinc

  12. Crop Requirement, Nutrient Table

  13. Crop Selection • Requirements of nutrients vary from crop to crop. • High-yielding perennial gross species are easy to manage and can remove significant amount of nutrients. • Summer and winter inter-cropping systems need to be considered

  14. Chart of soil Nutrient

  15. Conclusion • A simple optical sensor based on photometric analysis of soil . nutrients using three LED light' sources is proposed and its sensing characteristics were investigated both experimentally and theoretically. • The sensor could sensitively detect the colour changes caused by chemical reaction between soil nutrients in the sample and colour-developing reagents. • The achieved resolution was as small as 1,0-2.0 mg/100 g for available phosphorus (ftOs), nitrate nitrogen (NOa— N), ammonia nitrogen (NH^-N) and 2.0-2.5 mg kg""1 for available iron (Fe) and exchangeable manganese (Mn), and 20 mg/100 g for exchangeable calcium (CaO) for the standard solutions of soil nutrients.

  16. Conclusion……. • The transmittance of a specimen can theoretically be calculated by means of the absorption spectra of LEDs and colour-developed standard solutions. • The sensor may also be applied to measure the soil nutrients of several soil samples from various fields. • The sensor can distinguish a slight difference of colour and avoid misjudgments happening in the colour chart decision.

  17. Thank you

More Related