In the high-productivity zones, the fertilizer application rate was increased to 190 kg/ha, while it was reduced to 85 kg/ha in the low-productivity zones. We left control strips in the high and low-productivity zones to help us interpret the results.
We need control or test strips to confirm the working theory. Using the control strips with the standard rate of fertilizer application, we check whether variable-rate application affects the yields in this specific zone. For example, in the high-productivity zone, we apply 190 kg of fertilizer. In the same productivity zone, we keep a control strip, where we apply 130 kg of fertilizer. It's highly probable that we'll get objective results at the end of the season.
Find more about control strips and other things you should know to conduct the ideal field test in our blog post
Now back to Jamie. Let's check the field's NDVI data during the season: