So you can see signs of nutrient deficiency on the crop – but what is causing the problem? Tissue testing would give a definitive answer, and the scale of the problem.
In the meantime there are some apps available now that might help.
But is it really a nutrient deficiency? Only the apps from the GRDC and DAFWA consider other issues that might cause the symptoms.
Winter cereal nutrition – free (GRDC) iOS Android
Make sure you check for updates after downloading this app or there are missing photos. Covers wheat, barley, oats triticale and rye, covering deficiencies, toxicities, environmental and disease problems. You select the crop and the symptom and it offers possible disorders that might cause the symptoms, with pictures and background info about the causes and associations of the problem.
MyCrop – free (DAFWA) iOS Android
Targets wheat and barley, treating nutrient deficiencies as part of a broader set of constraints. Steps through what you can see on different parts of the plant, and across the paddock, narrowing down to what constraints could cause the set of problems observed.
Crop Nutrient Deficiency Image Library – $6.49 (IPNI) iOS
Lots of pictures of nutrient deficiencies across a range of crops. But you need to know what you are looking for as you navigate to images by nutrient.
CheckIT – free (Yara International) iOS Android
Allows you to filter by symptom, and part of plant to work towards a diagnosis, and by nutrient. Treats cereals as a group, not many images by crop type, gives information on the conditions that can lead to the problem, but at the end steers you towards a Yara fertiliser product.
Nutrient FieldGuide – free (Oklahoma State Univeristy) iOS
Uses a dichotomous key to step through to a nutrient deficiency diagnosis. Has a lot of information on nutrient removal by crop and comparing forms of fertiliser but the numbers are in lbs/acre.