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chlorosis
lack of chlorophyll resulting in leaves going from light green to yellow
marginal scorch
burnt appearance from potassium deficiency
lodging
soft, weak, injured growth
necrotic
dead brittle edges on leaves
macronutrients
6 of them, used the most by plants; include nitrogen, potassium, calcium, phosphorus, sulfur, and magnesium.
micronutrients
essential nutrients needed in smaller amount (9); aka trace elements
nitrogen loss
immobilization, denitrification
nitrogen addition
fixation, fertilization, OM addition
nitrogen transformation
mineralization, nitrification
trace elements
metals, excess can be toxic
Note 
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