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Abstract: The use of NIRS technology to analyse mushroom compost was investigated during a period of 7 years. During this period, several NIRS calibration lines were developed for a range of compost quality parameters such as moismre, nitrogen, ash, pH, ammonia, NDF, ADF and crude fiber. Four compost companies tested the developed lines for the routine control of phase I, II and III compost during a period of 3 years. Validations with wet chemical analysis were done twice yearly with a master instrument at a cenfral laboratory. The NIRS calibration lines contained 500 - 1100 (depending on the parameter) reference samples. They were very robust and showed a high accuracy and repeatability. The relationship between the NIRS predicted values and the reference values obtained by wet chemistry gave correlation coefficients between 0.87 (ADF) and 0.99 (moismre and NH4-N). The standard enor of calibration, the standar error of cross validation and the standard error of prediction are of the same level as those with wet chemistry. The repeatability of the assay was equal, and for nitrogen and ash even better with NIRS.
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