Availability of exchangeable and non-exchangeable potassium in some Jordan calcareous soils
2010
Al-Nasir, F.M.
THIS study aimed at estimating the quantity of exchangeable and non-exchangeable potassium (K) in calcareous agricultural soils in Jordan, and determining the contribution of exchangeable and non-exchangeable K to plant nutrition. The soils were collected from 18 different agricultural regions, and thereafter cultivated with alfalfa without adding fertilizers. The results showed significant differences for dry matter, total K uptake of the plant, and in the contribution of exchangeable and non-exchangeable K in different soils. The soils were divided into two major groups. The first group included Deer Alah, Alzaitunah, Almafrag, Aishubak and Albagah, which characterized mainly by high K in vegetative parts and optimum soil K content enough for Alfalfa growth in the second and third cuts. The other soils were clustered together in one group, which showed lower K concentrations than the optimum. Dry matter production was significantly correlated with K uptake in plant tissue (r=0.755**), and with exchangeable and non-exchangeable K (r= 0.536* and 0.589*, respectively). Total K uptake was significantly correlated with initial exchangeable K, and the contribution of exchangeable and non-exchangeable K in plant nutrition.
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