The analysis of paddy soils in Korea using visible

Authors: YongJoo Kim ChangHyun Choi

Publish Date: 2013/10/31

Volume: 56, Issue: 5, Pages: 559-565

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Abstract

Precision farming aims at reducing environmental risks and increasing productivity Soils are multifunctional media in which air water and biota occur together to form an essential part of the landscape with a fundamental role in the environment The requirement for herbicides and fertilizers can vary within a field in response to spatial differences in soil properties Near infrared NIR spectroscopy is widely used today as a nondestructive analytical technique which is capable of determining a number of physiochemical parameters The objective of this study was to develop optimal models for predicting chemical properties of paddy soils by visible and NIR reflectance spectra Reflectance spectra moisture contents pH total nitrogen organic matter available phosphate exchangeable potassium ex calcium ex magnesium ex sodium iron manganese zinc and copper of soil samples were measured The reflectance spectra were measured in the wavelength range of 400–2500 nm with 2nm intervals The method of moving window partial least square MWPLS analysis which is a wavelength interval selection method for multicomponent spectra analysis was used to determine the soil properties MWPLS models showed the possibility to predict chemical properties of soil samples in the wavelength range of 1000–2500 nm offering the possibility of considerable cost savings and increased efficiency over the conventional analysis method

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