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W Troyer ; E Meyer ; AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS | St Joseph (USA) : ASAE - American Society of Agricultural Engineers | ASAE Paper n°90-7046 | 1990Spectral reflectance and electronic image analyses were performed on the foliage of growing poinsettia plants, sujected to four different nitrogen treatment levels. The experiment, first completed in a greenhouse, was repeated in a growth chambe[...]
