Growers can use TerrAvion’s high-resolution NDVI data for in-season evaluations of hybrid, nutrient and chemical test plots. Imagery allows growers to assess product performance at different points of the season without having to wait for yield monitor results at the end of the year. While yield monitoring can sometimes be skewed by calibration and operator errors, TerrAvion NDVI imagery will always provide you with a consistently accurate reading of plant health from which you can infer the performance levels of hybrid, nutrient or chemical test plots.
1. To evaluate crop performance in your fields, first select the field that contains your test plot.
2. Select the date for which you want to evaluate the performance.
3. Turn on the Dynamic Vigor layer.
4. Zoom in to your test plot.
5. Select the polygon tool on the toolbar in the upper right-hand corner.
6. Draw a polygon around your test block. Be sure to be accurate with your drawing so that you don’t contaminate your vigor reading with nearby plants
7. Click on the first point placed to close your polygon
8. In the middle of the prompted label window, select histogram.
9. After the histogram loads, record the Average Vigor number and note the histogram
10. Repeat steps 4-9 for all of the zones you wish to compare
11. Compare the Average Vigor number and histograms for each of your test plots. The polygon with the highest NDVI value will in most cases be, depending on what type of product you are evaluating, the highest performing product.
In this example, zone 1 is the highest performing (most vigorous) zone at an average NDVI value of .46, followed by zone 3 at .44, zone 2 at .42 and zone 4 at .39.
12. When comparing the performance of test plots, be sure to note any other variables such as soil and moisture conditions.
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