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The Scientific World Journal
Volume 2015, Article ID 163968, 12 pages
Research Article

Calibration and Algorithm Development for Estimation of Nitrogen in Wheat Crop Using Tractor Mounted N-Sensor

1Department of Farm Machinery and Power Engineering, Punjab Agricultural University, Ludhiana 141001, India
2Krishi Vigyan Kendra, Samrala, Punjab 141114, India
3Krishi Vigyan Kendra, Mansa, Punjab 151505, India
4Department of Botany, Punjab Agricultural University, Ludhiana 141001, India

Received 9 December 2014; Accepted 4 February 2015

Academic Editor: Wujun Ma

Copyright © 2015 Manjeet Singh et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The experiment was planned to investigate the tractor mounted N-sensor (Make Yara International) to predict nitrogen (N) for wheat crop under different nitrogen levels. It was observed that, for tractor mounted N-sensor, spectrometers can scan about 32% of total area of crop under consideration. An algorithm was developed using a linear relationship between sensor sufficiency index () and to calculate the as a function of . There was a strong correlation among sensor attributes (sensor value, sensor biomass, and sensor NDVI) and different N-levels. It was concluded that tillering stage is most prominent stage to predict crop yield as compared to the other stages by using sensor attributes. The algorithms developed for tillering and booting stages are useful for the prediction of N-application rates for wheat crop. N-application rates predicted by algorithm developed and sensor value were almost the same for plots with different levels of N applied.