A neural network (NN) approach was used to determine relationships between soil colour and a range of physical and chemical characteristics, using a dataset derived from the NSIS (National Soil Inventory of Scotland) database. It was found that several soil characteristics could be predicted accurately from colour, using only Red, Green and
Blue (RGB) values fromthe RGB system or L, a and b fromthe CIELab system. These characteristics included organic matter content (measured by Loss On Ignition), nitrogen content and several elements including Ca, Ti and Mo. It was found that some parameters, such as potassiumand phosphorus,were not predicted accurately, however. Prediction of soil colour from available physiochemical parameterswas found to give high levels of accuracy,with the strongest influence of prediction coming fromLOI, nitrogen, mineral texture and a fewmetals including V, Cr,Mn and Zn. Sensitivity analysis of the trained neural network modelswas carried out, but did not provide much useful information. Potential applications of theNNmodelling approach are discussed, including rapid field assessment of soil nutrient status, and potential improvements to soil horizon classifications.
A neural network (NN) approach was used to determine relationships between soil colour and a range of physical and chemical characteristics, using a dataset derived from the NSIS (National Soil Inventory of Scotland) database. It was found that several soil characteristics could be predicted accurately from colour, using only Red, Green and
Blue (RGB) values fromthe RGB system or L, a and b fromthe CIELab system. These characteristics included organic matter content (measured by Loss On Ignition), nitrogen content and several elements including Ca, Ti and Mo. It was found that some parameters, such as potassiumand phosphorus,were not predicted accurately, however. Prediction of soil colour from available physiochemical parameterswas found to give high levels of accuracy,with the strongest influence of prediction coming fromLOI, nitrogen, mineral texture and a fewmetals including V, Cr,Mn and Zn. Sensitivity analysis of the trained neural network modelswas carried out, but did not provide much useful information. Potential applications of theNNmodelling approach are discussed, including rapid field assessment of soil nutrient status, and potential improvements to soil horizon classifications.
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