title: Calibration and algorithm development for estimation of nitrogen in wheat crop using tractor mounted N-sensor.
abstract: 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 (SIsensor) and SISPAD to calculate the N app as a function of SISPAD. 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.
authors: Department of Farm Machinery and Power Engineering, Punjab Agricultural University, Ludhiana 141001, India.
authors: Manjeet
authors: M
authors: Singh
authors: Krishi Vigyan Kendra, Samrala, Punjab 141114, India.
authors: Rajneesh
authors: R
authors: Kumar
authors: Krishi Vigyan Kendra, Mansa, Punjab 151505, India.
authors: Ankit
authors: A
authors: Sharma
authors: Department of Farm Machinery and Power Engineering, Punjab Agricultural University, Ludhiana 141001, India.
authors: Bhupinder
authors: B
authors: Singh
authors: Department of Botany, Punjab Agricultural University, Ludhiana 141001, India.
authors: S K
authors: SK
authors: Thind
mesh_terms: D000383:Agriculture / Q000295:instrumentation; D000465:Algorithms; D018533:Biomass; D002138:Calibration; D002734:Chlorophyll / Q000032:analysis; D000069599:Crop Production / Q000379:methods; D005308:Fertilizers / Q000032:analysis; D009584:Nitrogen / Q000032:analysis*; D055096:Optical Devices; D014908:Triticum / Q000737:chemistry* / Q000254:growth & development
chemical_list: D005308:Fertilizers; D002734:Chlorophyll; D009584:Nitrogen