Abstract: The investigation indicates that rubber-coffee interplanting system can make proper use of soil resources and light energy and produce higher economic benefits.Rubber trees are planted closely with wide row spaces and enough light radiation can let in, which can reduce the cut-side and base rots and the cold-injury of rubber trees. Coffee and green manures are planted respectively among wide and narrow row spaces, forming a steroscopic structure. Both rubber and coffee can obtain higher productivities.

Key words: winter wheat, leaf nitrogen accumulation, spectral response function, pixel unmixing, pure pixel spectra