Accurately determine and record color from nutrient deficiency in plant tissues.
Contains 320 matte color chips mounted on charts for 17 hues: 2.5R, 5R, 10R, 2.5YR, 5YR, 7.5YR, 2.5Y, 5Y, 2.5GY, 5GY, 7.5GY, 2.5G, 5G, 7.5G, 5BG, 2.5B, and 5RP.
Instructions, binder, and masks included. 1977 Edition.