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Sodium Bicarbonate Extraction to Estimate Nitrogen, Phosphorus, and Potassium Availability in Soils¹

ABSTRACT

The extractability of NO₃-N, P, and K from five calcareous soils differing in physical and chemical characteristics by NaHCO₃ (0.5M, 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 NO₃-N recovery was independent of the factors studied. Linear relationships were obtained between NaHCO₃-and NH₄OAc-extracted K, and NaHCO₃- and KCl-extracted NO₃-N. The slopes for NO₃-N were 45° for all soils, but were specific for each soil in the case of K.

¹ Contribution from the Agric. Res. Organ., Div. of Soil Chemistry & Plant Nutrition, and the Central Analytical Lab., The Volcani Center, Bet Dagan, Israel. 1976 Series, No. 126-E.

² Soil Scientist and Chemist, respectively.

Received for publication April 26, 1976. Accepted for publication October 19, 1977.

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