Rapid Determination of Nitrogen and Potassium Contents in Tobacco Leaves by Near Infrared Reflectance Spectroscopy

Abstract

NIRS technique was applied to measurement of total Nitrogen(TN)and total Potassium(TK)contents in tobacco leaves.The TN and TK contents of 104 tobacco leaves calibration samples and 40 prediction samples were measured by conventional analysis methods and NIRS method,which were combined to establish the calibration model by PLSR method.The calibrations for TN and TK contents were highly accurate with coefficients of determination of 0.951 and 0.928 for prediction and root mean standard errors of prediction(RMSEP)of 0.301 and 0.278,respectively.The results showed that technique could be applied for diagnoses of N and K nutrient in tobacco cultivation.