Spatial approach for diagnosis of yield-limiting nutrients in smallholder agroecosystem landscape using population-based farm survey data
Fig 6
Soil test critical values with the Cate-Nelson method analysis for a) Nitrogen, b) Phosphorus and c) potassium. The intersection of blue lines, the vertical and horizontal line of the x, and y represents critical values for soil test values beyond which crop response is unlikely. The black dots are characterized as responsive plots while the white dots are non-responsive plots.