* what will be the trend of vertisols reflectance curve for predicting soil nutrients(by spectro-radiometer)?
* Please do suggest what will be the absorbance values(approx range) of all nutrients(mainly micronutrients eg.Zn,Fe,Ca,Na,Mg,Br,Cu,B,S,Mn)
Dear Mr. Nayak,
whatever source you may trust upon (satellite-based, aircraft-based, drone-based) the system needs CIR (color infra red images) and is rather complex and to my knowledge standards are difficult to provide. In addition, you will not achieve reasonable results, unless you spend a lot of time doing ground-follow-up work with different types of spectrometer and being fitted with a good deal of knowledge in soil science and geology. Barren rocks need no vitality checks of the vegetation, soils are looked at from this angle too. It depends upon the season and day-time when the digital data have been captured by the remote-sensing device and during ground follow-up. Too many expect too much from this method with too little personal input. You may get fine images which may be impressive to the audience unaware of these side-effects mentioned above. Your question is at the brink of speculation. On the other hand vertisol marks a special type of soil which is present in a wide range of climatic zones and landscapes and typical of smectite-group phyllosilicates which are a sink for a wide range of elements.
Split your problem up into different packages so as to allow for a multiple-choice approach and do not only focus on one method only.
Best regards
H.G.Dill
Please get in touch with Dr. Rajiv Srivastava, Head, Division of Remote Sensing, ICAR-NBSS&LUP, Nagpur, who has been working in this field for the last decade.
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