Abstract
AbstractA peak of NO3‐ accumulation occurred in the 1‐ to 2‐cm depth of an 11‐cm soil column when 0.2 meq of KNO3 was applied in sufficient solution (16 ml) to fill the pore space in a column of air‐dry San Gregorio soil. Practically no NO3‐ was found below the 4‐cm depth. The greater portion of the NO3‐ applied was displaced from the soil column by the addition of 3 pore volumes of water. The anion distribution coefficient obtained from a column of San Gregorio soil was 2.2 ml/g and was similar to that obtained from a batch‐type method when the soil was in equilibrium with the same concentration of NO3‐. The rate of NO3‐ desorption was described by a first‐order reaction equation. The effect of adding SO42‐ and NO3‐ in the same column was to increase the rate of movement of NO3‐. Sulfate movement was much slower than that of NO3‐.
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