Water pretreatment helps during extraction of mineral‐N from a clay soil

Abstract

Pretreatment with water of samples of a heavy clay soil sieved to 12 mm enhanced extraction of mineral nitrogen with 2N KC1. The pretreatment gave results similar to those given by the much slower method of sieving the samples to 2 mm. Further time saving resulted from the improved filtering behaviour of the water pretreated extracts.