NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K) — the three primary macronutrients essential for plant growth. NPK fertilizers supply these nutrients to soil, and the 'NPK ratio' (like 10-26-26) indicates the percentage of each nutrient in the fertilizer. Understanding NPK is fundamental to agriculture and plant science.
NPK = Nitrogen (N), Phosphorus (P), Potassium (K)
Three primary macronutrients essential for plant growth
N: vegetative growth; P: root/flower/seed; K: water regulation/disease resistance
NPK ratio (e.g., 10-26-26): percentage of N, P₂O₅, K₂O in fertilizer
DAP (18-46-0): most common P fertilizer; Urea (46-0-0): most common N fertilizer
K symbol comes from Latin 'Kalium'
N = Nitrogen Role in plants: Essential for chlorophyll production, protein synthesis, and overall vegetative growth (leaves and stems). Nitrogen-deficient plants show yellowing of older leaves (chlorosis).
P = Phosphorus Role in plants: Essential for root development, flower and fruit formation, seed production, and energy transfer (ATP/ADP cycle). Phosphorus deficiency causes dark purplish leaves and poor root growth.
K = Potassium (Chemical symbol K from Latin 'Kalium') Role in plants: Regulates water uptake (stomatal opening/closing), enzyme activation, disease resistance, and overall plant strength. Potassium deficiency causes brown, scorched leaf edges.
These three are called 'primary macronutrients' because plants need them in the largest quantities.
NPK ratio: The three numbers on fertilizer bags (e.g., 10-26-26, 12-32-16, 17-17-17) represent the percentage by weight of N, P₂O₅, and K₂O.
Example: 10-26-26 fertilizer contains:
Common NPK fertilizers in India:
Beyond NPK, plants also need:
Secondary macronutrients (needed in moderate quantities):
Micronutrients (needed in very small amounts but essential):
Deficiency of any essential nutrient can cause specific symptoms (e.g., Zn deficiency causes 'Khaira' disease in rice).
NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K) — the three primary macronutrients essential for plant growth. NPK fertilizers supply these nutrients to the soil and are labelled with an NPK ratio (e.g., 10-26-26) showing the percentage of each nutrient.
Nitrogen is essential for chlorophyll production, protein synthesis, and vegetative growth (leaves and stems). It promotes green, leafy growth. Nitrogen deficiency causes yellowing of leaves (chlorosis), especially older leaves.
The NPK ratio (e.g., 10-26-26) shows the percentage by weight of nitrogen (N), phosphorus (as P₂O₅), and potassium (as K₂O) in the fertilizer. A 10-26-26 fertilizer contains 10% N, 26% P₂O₅, and 26% K₂O.
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