Del laboratorio al campoCaracterización de ensilados de maíz con sensores NIRS portátiles

Resumen

Using two NIRS instruments, one of them working at laboratory level (at-line) and anotherone a handheld instrument (on-site), and a total of 261 maize silages,the possibilities to transfer prediction models between at-line and on-site instruments were evaluated tooptimize the use of NIRS sensors for in-situ characterization of nutritive and fermentative parameterson wet and intact maize silages. To transfer the prediction models, both instruments were standardizedapplying a standardization matrix developed with ten maize silages in order to adjust the differencesbetween wavelengths of both instruments. The success of transference was evaluated by comparing theglobal and neighbourhood average distances between on-site and at-line instruments before and afterthe standardization process. The external validation of the final calibration model was carried out withten samples, by comparing reference versus predicted values using a mean comparison test (student-t).The results were satisfactory without significant differences between reference and NIRS with theexception of starch. These results have demonstrated the availability of NIRS technology to obtainnutritive and fermentative information of wet intact maize silages in real time.