A feasibility quantitative analysis of NIR spectroscopy coupled Si-PLS to predict coco-peat available nitrogen from rapid measurements

•Quantification detection study of coco-peat available nitrogen based on NIR full-band.•Coco-peat available nitrogen prediction model will be simplified by Si-PLS.•The effect of spectral pre-processing on screening synergy intervals was studied.•Performance comparison of Si-PLS screening band model and full-band model.•The optimal synergy intervals of coco-peat available nitrogen are concentrated in post-band.