highly significantp < 0.01
According to the results of the polynomial regression, these correlations between the crop yield and the soil point value is highly significant at * p < 0.01.
According to the results of the polynomial regression, these correlations between the crop yield and the soil point value is highly significant at * p < 0.01.
A clear trend emerges: the average NDVI in the “suitable” soil category is 8.9% lower than in the “highly suitable” category.