The seven color classified image above shows a cotton field
in North Alabama. This field is under pivot irrigation with
nitrogen water. The pH tends to drop faster under the pivot
compared to outside of the pivot. The areas marked in the image
shows areas that have been watered by the end-gun of he pivot
system. Not all brown or beige spots in the field are related to
low pH. To correct the low pH
problem the grower will apply higher rates of lime under the pivot
compared to outside the pivot. However, this image shows that the
lime application in the areas indicated by the arrows have not
been enough to correct the problem. The grower has not extended
the lime application far enough outside the pivot to account for
the end-gun. In the field it
would have been hard to detect these spots unless someone covered
the whole field. An image like this can help growers to optimize
crop production in a far more time and cost efficient way than
ever before.
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