In the gypsum requirement test, does exchangeable acidity interfere with the test results?

02 February 2014 1 6K Report

I am having trouble testing GR in my soils as the non saline soil have a positive GR. Does exchangeable acidity interfere with the test? And for potassium, how much must be present to interfere with the results?

Debashis Mandal

I don't think any interference by exchangeable acidity.In many laboratories the quantity of gypsum required for reclaiming sodic soil is determined by the gypsum requirement (GR) test suggested by Schoonover (1952). The main principle in this method is amount of calcium required to replace the exchangeable sodium plus that required to neutralize all the soluble sodium carbonate in the soil.

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