LDSF Topsoil Potassium (K)
Potassium is the second most concentrated nutrient in plants and is essential for crop productivity. Potassium deficiencies may be recognized in crops as burnt edges on lower, older leaves, sometimes confused for water shortage. Soil potassium deficiencies may be indicated by exchangeable potassium (exch. K) concentrations < 0.5cmolc kg-1. Predicted exch. K concentrations were below this threshold in 87% soils sampled indicating the need for K fertilizer.
There were significant differences in LULC types (P = 0.02) for topsoil exch. K. Forest had more than 200% the exch. K of the next highest LULC, Agroforestry and Rock. There were no significant difference between Barren Land, Cropland, Pasture and Rock. Aside from Forest and Agroforesty all LULC had mean values for exch. K. below the critical threshold.
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