Based on IPNI’s popularCrop Nutrient Deficiency Image Collection, the app contains key photos of classic nutrient deficiency documented from research plots and farm fields for 14 common crops. It also provides supporting text and illustrations of nutrient deficiencies.

The app can be downloaded and viewed on iPhone, iPad or iPod Touch devices.

IPNI thanks its contributors – part of a worldwide network of agricultural researchers, extension staff, field scouts and farmers – for providing the images used in its collections. 
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—From International Plant Nutrition Institute news release