‘Crop Nutrient Deficiency Photo Library’ is a great means off assessing your crops for possible deficiencies. The library contains photos of many different plants suffering from many different nutrient deficiencies. It can be another useful tool in your toolbox for your in-crop inspections of plant health. As an app, it is a quick and easy guide to assessing your crop. All images are downloaded when you download the app, so phone service isn’t necessary to access the images, which can be helpful in remote areas, or black spots.