Crop Nutrient Deficiency Photo Library App for iPhone/iPad/iPod touch – A comprehensive collection of crop nutrient deficiency photos. A range of nutrient deficiency examples are provided for 14 prominent crops. Text and diagrammatic descriptions are also provided. Crops include: alfalfa, banana, barley, canola, citrus, cotton, maize, oil palm, potato, rice, sorghum, soybean, sugarcane, wheat.

Crop Nutrient Removal Calculator – estimates crop nutrient removal of nitrogen (N), phosphorus (expressed as P2O5), potassium (expressed as K2O), and sulfur (S) for a broad list of field crops. Crops include: alfalfa, almond, apple, bahaigrass, barley, beans, bermudagrass, birdsfoot trefoil, bluegrass, broccoli, bromegrass, buckwheat, cabbage, canola, cantelope, celery, corn, cotton, fescue grass, flax, grapes, lettuce, millet, mint, oat, oranges, orchardgrass, peach, peanut, pear, potato, prunes, red clover, reed canary grass, rice, rye, ryegrass, safflower, sorghum, soybean, squash, sugarbeet, sugarcane, sunflower, sweet potato, switchgrass, timothy grass, tobacco, tomato, vetch, wheat (spring/winter).