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TISSUE CONCENTRATION, DEFICIENCY SYMPTOMS AND FERTILIZER SOURCES
Nutrient
Tissue Concentration
Characteristic Deficiency Symptom*
Fertilizer Sources
MACRONUTRIENTS
N
2-6%
older leaves - overall chlorosis NH4 nitrate, sulfate, phosphate;
K, Na, or Ca nitrate; urea 
P
0.2-1.2%
older leaves - deep green, purple coloration of petioles superphosphate; NH4 or K phosphate; phosphoric acid 
K
1-6% 
(luxury 
consumption)
older leaves - interveinal chlorosis with marginal and tip necrosis K nitrate, chloride, phosphate, or sulfate; K frit 
Mg
 0.2-1%
older leaves - interveinal chlorosis and bronze coloration dolomite (Ca/Mg carbonate), 
Mg sulfate (Epsom salt)
Ca
0.5-2%
stem tips - die, small leaves limes (Ca carbonate/hydroxide);
Ca sulfate (gypsum) or nitrate; 
superphosphate
S
0.3-0.7%
all leaves overall chlorosis, on young leaves 1st then progresses to old leaves sulfate carriers; elemental S; 
air pollution; superphosphate
MICRONUTRIENTS**
Fe
50-300 ppm
young leaves - severe interveinal chlorosis  Fe chelate; Fe sulfate; some pesticides 
Zn
5-75 ppm
new growth - rosetted growth & small leaves Zn chelate; Zn sulfate; 
some pesticides
Mn
30-300 ppm
young leaves - interveinal chlorosis with necrosis when severe Mn chelate; Mn sulfate; 
some pesticides
Cu
5-30 ppm
stem tips - die, stunted; leaves small; multiple buds formed Cu chelate; Cu sulfate; 
some pesticides
B
30-200 ppm
stem tips - internodes short, thick; leaves thick, brittle, with necrosis borax; boric acid
Mo
1 ppm
similar to N deficiency, except occurs on young leaves. Na or NH4 molybdate 
Cl and 
Ni
?
virtually never seen in nature ubiquitous
*chlorosis = yellowing;  necrosis = browning;  interveinal = between the veins
**micronutrients are often applied as a multi-micronutrient mix; ex. STEM, PERK, Micromax