23. PENYAKIT TANAMAN AKIBAT
KEKURANGAN HARA
Nutrients essential to plant growth
Element Chemical symbol form(s) taken up by plant
Macronutrient
Nitrogen N NH4
+, NO3
-
Phosphorus P H2PO4
-, HPO4
2-
Potassium K K+
Calcium Ca Ca2+
Magnesium Mg Mg2+
Sulfur S SO4
2-
Micronutrient
Iron,Zinc,Maganese,Copper,Boron,Molybdenum,Chlorin
Silicon, Sodium, Cobalt, vanadium
24.
25. NITROGEN
ROLE IN PLANT NUTRITION: Amino
acid synthesis. Protein, coenzymes, nucleic
acid formation. Chlorophyll and ATP
synthesis
DEFICIENCY SYMPTOMS :Lack of
growth or stunted growth. General yellowing
of foliage, older leaves first. Loss of leaves
under severe deficiency. Purplish colouration
due to accumulation of anthocyanin
pigments
28. PHOSPHORUS
• DEFICIENCY SYMPTOMS: Reduced
growth. Production of dark green foliage.
Reduced tillering in cereals. Reddening or
yellowing of leaf margins and necrosis of
older leaves. Reduced fruit quality and
storage potential
• ROLE IN PLANT NUTRITION Energy
transfer. Formation of nucleic acids.
Protein synthesis. Cell membrane
component