*Am also looking for the methodology to predict spatial variability of soil nutrients (specially for pigeon pea fields in India )
* Even want to know ,predicting spatial variability of micro nutrients( other than N,P,K) may help in knowing the soil fertility index in robust manner.
Hi Vinod, You can also look at this paper and others on XRF technology by Weindorf and others: https://www.researchgate.net/publication/270218560_Characterizing_soils_via_portable_x-ray_fluorescence_spectrometer_2._Spodic_and_Albic_horizons
Article Characterizing soils via portable x-ray fluorescence spectro...
You can see this weblink:http://www.sciencedirect.com/science/article/pii/S016819231530023X. Remote estimation of soil organic matter content in the Sanjiang Plain, Northest China: The optimal band algorithm versus the GRA-ANN model. This is my study.
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