https://www.enst.umd.edu/research/research-centers-labs/soil-quality-lab/plant-deficiencies
Plant Deficiencies | Environmental Science & Technology
plant deficienciesenvironmental sciencetechnology
https://yardandgarden.extension.iastate.edu/identifying-plant-nutrient-deficiencies/older-leaves
Identifying Plant Nutrient Deficiencies: Older Leaves Affected | Yard and Garden
Effects are mostly generalized; plants are dark or light greenEffects are mostly localized; chlorosis (yellowing) with or without spotting
plant nutrientidentifyingdeficienciesolderleaves