The extractability of NO 3 ‐N, P, and K from five calcareous soils differing in physical and chemical characteristics by NaHCO 3 (0.5 M , pH 8.5) was studied under laboratory conditions. The extracted amounts of the three ions were related to time since their application to the soils, to the equilibration period of the soils with the extractants, to the concentration of the ions in the soils, and to the clay content of the soils. After about 70 days in the soil, the extractability of each ion at a given application level was independent of time. The recovery percentage of P and K as a function of the applied amounts of these elements depended mainly on the clay content of the soils, while NO 3 ‐N recovery was independent of the factors studied. Linear relationships were obtained between NaHCO 3 ‐and NH 4 OAc‐extracted K, and NaHCO 3 ‐ and KCl‐extracted NO 3 ‐N. The slopes for NO 3 ‐N were 45° for all soils, but were specific for each soil in the case of K.
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Bar‐Yosef et al. (1978) studied this question.