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Rongguang Zhu, Lujia Han*, Zengling Yang, Xian Liu,
College of Engineering, China Agricultural University Beijing 100083 P. R. China

Feed contaminated with meat and bone meal (MBM) is commonly accepted as the main transmission carrier of BSE. Use of compound fertilizers or composts adulterated with banned MBM in livestock grazing systems may cause potential BSE risk through feed chain. The objective of this study was to demonstrate the feasibility of using NIRS to determinate MBM content in compound fertilizers and composts. 140 adulterated fertilizer samples were prepared in laboratory by mixing 4 kinds of compound fertilizers with 3 kinds of MBM randomly at different levels of 0.1%-10.0% (w/w). 120 adulterated compost samples were obtained by mixing 41 compost samples with 28 MBM at different levels of 3%-24% (w/w). Samples were divided into a calibration set and a validation set based on concentration grads. A NIRS system SPECTRUM ONE NTS (PerkinElmer, USA) was used for NIRS analysis.

Samples were scanned in rotating quartz cell. Each of the samples was scanned 3 times as log 1/R over the wavenumber range 10000 cm-1 to 4000 cm-1 and the average spectrum was recorded. The NIRS calibration models were developed using partial least squares (PLS) regression method. Results showed that the correlation coefficients of calibration (R2) were 0.996 and 0.622 for adulterated compound fertilizers and composts, the correlation coefficients of validation (r2) were 0.988 and 0.722, and the RPD (SD/SECV) were 8.84 and 1.87, respectively. These results indicated that NIRS could be used to quantify the adulteration of banned MBM in compound fertilizers with high prediction accuracy, and be insufficient to determinate the content of MBM in composts for considerably low prediction accuracy.

Keywords:
NIRS, Quantification, MBM, Compost, Compound fertilizer