Desorption of potassium from five soils of North India using electro-ultrafiltration

Samples were collected from five soil series, developed on different parent materials and occurring widely in intensively cultivated areas of Northern India. Potassium in these soils was desorbed by electro-ultrafiltration, and collected in different fractions by applying successively higher voltages and temperature. K was also determined by extraction with M neutral ammonium acetate and M boiling nitric acid. Potassium desorption using EUF differentiated between soil series and between low K and high K soils. The K-buffering capacity of the soil was associated with soil texture.