Physiological Role of Macroelements like Nitrogen,Phosphorus and Potassium in Plants are described in brief

1. PHYSIOLOGICAL ROLE OF MACRO NUTRIENTS IN
PLANTS
Dr.M.A.Soniya
Assistant Professor
E.M.G.Yadava Women’s College
Madurai

2. Macronutrients are essential for plant growth and
a good overall state of the plant. The primary
macronutrients are Nitrogen (N), Phosphorus (P),
and Potassium (K). Nitrogen is essential for plant
development, since it plays a fundamental role in
energy metabolism and protein synthesis.

3. ROLE OF MAJOR NUTRIENTS NPK IN
PLANTS
 Macronutrients are nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg)
and sulfur (S).
 The "Big 3" primary nutrients in commercial fertilisers are nitrogen, phosphorus, and potassium, or
NPK. The ability of a plant to use and store energy, including the process of photosynthesis, is tied to
the second of the Big 3 elements, phosphorus. It's also required for appropriate plant growth and
development.

4. NITROGEN
Nitrogen is used by plants for lots of leaf growth and good
green color.
PHOSPHORUS
Phosphorous is used by plants to help form new roots,
make seeds, fruit and flowers. It's also used by plants to
help fight disease.
POTASSIUM
Potassium helps plants make strong stems and keep
growing fast.

5. NITROGEN DEFICIENCY
 Plants that are deficient in nitrogen have stunted growth, depending on the severity of the
deficiency. Leaf growth is inhibited; younger leaves are inhibited in particular. Longitudinal shoot
growth is inhibited, as is the increase in thickness.

6. NITROGEN DEFICIENCY OF
TOMATO PLANT POTATO PLANT

7. CARROT PLANT RADDISH PLANT

8. RICE PLANT

9. PHOSPHOROUS DEFICIENCY
 Plants generally turn dark green (both leaves and stems) and appear stunted.
Older leaves are affected first and may acquire a purplish discoloration. In some
cases, leaf tips will brown and die appear weak and maturity is delayed.

10. PHOSPHORUS DEFICIENCY OF
TOMATO PLANT POTATO PLANT

11. RICE PLANT RADDISH PLANT

12. MAIZE PLANT

13. POTASSIUM DEFICIENCY
 Typical symptoms of potassium deficiency in plants include brown scorching and
curling of leaf tips as well as chlorosis (yellowing) between leaf veins. Purple spots
may also appear on the leaf undersides. Plant growth, root development, and
seed and fruit development are usually reduced in potassium-deficient plants.

14. POTASSIUM DEFICIENCY OF
RICE PLANT TOMATO PLANT

15. POTATO PLANT RADDISH PLANT