A modification of the volumetric cobaltinitrite method of potassium estimation has been described. Washing the precipitate with 10% acetic acid, followed by 2.5% sodium sulphate has been demonstrated to be a satisfactory substitute for alcohol washing, thus eliminating the use of alcohol, which is usually costly. The applicability of the method to a wide range of potassium concentrations in fertiliser material has been tried, as also to soils representing different important soil groups and regarding a wide range of potassium contents. It is suggested that by employing this modified method it is possible to dispense with the use of the costly material, alcohol.
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Agricultural Students Union
Tamil Nadu Agricultural University
Coimbatore - 641 003
Tamil Nadu, India.
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