is there any method to analyze mineralizable nitrogen other than by the potassium permanganate method?
Most people measure ammonium and nitrate, as estimates of immediately available N. Mineralisation is another question and so too is are the losses.
The following review article provides details of several chemical and biological mineralization methods and their comparison under submerged rice soils.
Nitrogen availability indexes for submerged rice soils by K. L. Sahrawat Advances in Agronomy vol. 36 p415.
Available on internet.
Yes, there are alternative methods to analyze mineralizable nitrogen (N) besides the potassium permanganate method. Some common methods include:
Note: Each of these methods has its advantages and limitations, and the choice of method may depend on factors such as your objectives, soil characteristics, and available resources. It's important to consider the suitability and accuracy of the chosen method for the intended application.
Among the biological mineralization methods, the following method may require less duration , one week.
A soil test procedure for assessment of available nitrogen in rice soils. Subbiah, B. V. and Bajaj, J. C. 1962
Current Science , 31,196.
One can compare and correlate this method with the chemical mineralization method