Core concept
The poster emphasizes mobile nutrient reallocation, where the plant shifts resources from older tissue to new growth during deficiency.
Nitrogen and phosphorus progression
Nitrogen early stage is shown as uniform chlorosis and general yellowing on older leaves, progressing to tip necrosis, slowed growth and eventual severe necrosis with leaf drop.
Phosphorus early stage is shown as dark blue-green foliage with purpling of stems or petioles, followed by stronger purpling, necrotic spotting and finally severe necrosis with stunted underdeveloped buds.
Potassium progression
Early potassium deficiency is shown as marginal chlorosis and tip burn on older leaves.
Mid stage shows advanced edge burn, curling and weak stems.
Late stage shows crispy margins, leaf curl, necrosis and reduced bud quality.
Key symptom summary
Nitrogen fades into yellows.
Phosphorus darkens into blue-green and purple tones.
Potassium burns the margins and curls the leaves.