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Development of a wheat yield model for Punjab using remotely sensed data and historical yield trends |
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| Authors: | T T Medhavy Tara Sharma R P Dubey R K Mahey P K Sharma |
| Institution: | 1. Space Applications Centre, 380 053, Ahmedabad 2. Punjab Agricultural University, 141 004, Ludhiana 3. Punjab Remote Sensing Applications Centre, 141 004, Ludhiana |
| Abstract: | Spectral yield models for Punjab were updated by incorporating the latest data set on district-wise Normalised Difference Vegetation Index (NDVI) and wheat yields. In order to improve the model, historical yield trend for the past ten years was used to derive a linear regression relation for each district. Yield predicted by these linear trend relations was evaluated for validation of the approach. Finally a multiple regression relation incorporating both NDVI and trend-predicted yield was developed. This model shows better prediction capability as seen from yield forecasts of 1991–92 season. |
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