Fundamentals of agronomy Part 4 🔰 Introduction— Essential Plant Nutrients PPT
Understanding the essential plant nutrients is one of the most crucial parts of agronomy. Whether you’re a B.Sc. Agriculture student starting your semester or preparing for competitive exams like NABARD, AFO, FCI, or JRF — this topic lays the foundation for crop nutrition and plant health.
In this Essential Plant Nutrients PPT part, we will systematically explore the basic concepts of essential nutrients, their classification, functions, absorption mechanisms, and the role of fertilizers and manures. The content is prepared as per the 6th Dean Committee Syllabus, enriched with visual PPT slides, in-depth explanations, infographics, and PYQs (Previous Year Questions) from real agriculture exams.
Our goal is to make learning visual, engaging, and 100% exam-relevant — so you don’t just memorize but understand and apply the concepts confidently.
Topics cover
Essential Nutrients
Definition, Criteria of Essentiality, Functional Elements
Classification: Macro & Micro Nutrients
Role of Nutrients in Plant Growth
Nutrient Absorption
Active & Passive Absorption
Forms of Nutrients Absorbed
Manures and Fertilizers
Inorganic, Organic, Bio-fertilizers (Classification & Characteristics)
Nutrient Use Efficiency
Method of Preparation & Role in Crop Production
What is essential plant nutrients
Classification of essential plant nutrients
17 essential plant nutrients and their functions ppt
Important function of essential plant nutrients
Diverse source of essential plant nutrients
how plant nutrients uptake mechanism work
nutrient uptake mechanism in plants ppt
explain the role of macronutrients found in plants
role of secondry plant nutrient
role of micronutrients in plants
what is biofertilizer with example
nitrogen fixing bacteria as biofertilizer
rhizobium species for different crops
Non symbiotic nitrogen fixing bacteria
what is three criteria of essentiality of plant nutrients
nutrient use efficiency ppt
🌾5 Previous Year Questions (AFO, NABARD)
1. Which of the following is not a function of Nitrogen in plants? (IBPS AFO Mains 2022)
A. Promotes vegetative growth
B. Increases leaf size and color
C. Helps in chlorophyll synthesis
D. Increases root elongation
📝 Additional Information
A. Promotes vegetative growth: Nitrogen is a key component of amino acids and proteins, which help in shoot and leaf development.
B. Increases leaf size and color: Nitrogen makes leaves larger and greener by increasing chlorophyll content.
C. Helps in chlorophyll synthesis: It is directly involved in chlorophyll production, which is essential for photosynthesis.
D. Increases root elongation: Incorrect. Phosphorus, not nitrogen, is the major nutrient responsible for root development.
2. Which fertilizer contains all three primary nutrients – N, P, and K? (NABARD Grade A 2021)
A. Urea
B. DAP
C. NPK (12:32:16)
D. SSP
📝 Additional Information
A. Urea: Only contains nitrogen (46% N).
B. DAP (Di-Ammonium Phosphate): Contains nitrogen and phosphorus only.
C. NPK (12:32:16): It’s a complete fertiliser with 12% N, 32% P₂O₅, and 16% K₂O.
D. SSP (Single Super Phosphate): Contains phosphorus and a bit of sulfur, no N or K.
3. Which among the following is a biofertilizer? (ICAR JRF 2020)
A. Rock Phosphate
B. Azotobacter
C. Ammonium Nitrate
D. Potash
📝 Additional Information
A. Rock Phosphate: A mineral source of phosphorus, not a biofertilizer.
B. Azotobacter: A free-living nitrogen-fixing bacteria — a true biofertilizer.
C. Ammonium Nitrate: Inorganic nitrogen fertilizer.
D. Potash: Refers to potassium-based chemical fertilizers.
4. Which of the following is a characteristic of green manures? (FCI AG III 2019)
A. They are applied in liquid form
B. They are industrial fertilizers
C. They are fast-growing leguminous crops grown and plowed under
D. They are always perennial crops
📝 Additional Information
A. Applied in liquid form: This refers to foliar sprays or fertigation, not green manures.
B. Industrial fertilizers: Green manures are natural, not industrial.
C. Leguminous crops plowed under: True. Green manures like Sunnhemp are plowed into soil to enrich it with organic matter and nitrogen.
D. Always perennial: Most green manure crops are annuals, not perennials.
5. Which nutrient is absorbed by plants in the form of H₂PO₄⁻ and HPO₄²⁻? (IBPS AFO Mains 2023)
A. Potassium
B. Calcium
C. Phosphorus
D. Nitrogen
📝 Additional Information
A. Potassium: Absorbed as K⁺ ion.
B. Calcium: Absorbed as Ca²⁺.
C. Phosphorus: Plants absorb it as dihydrogen phosphate (H₂PO₄⁻) and hydrogen phosphate (HPO₄²⁻) depending on soil pH.
D. Nitrogen: Taken up mainly as NO₃⁻ (nitrate) or NH₄⁺ (ammonium).
Students also ask section
There are 17 essential nutrients required for plant growth, including carbon, hydrogen, oxygen (from air and water), and 14 others obtained from the soil.
Macronutrients are required in large amounts (e.g., N, P, K, Ca, Mg, S), whereas micronutrients are needed in very small quantities (e.g., Zn, Fe, Cu, Mn, B, Mo, Cl, Ni).
This law states that plant growth is limited by the nutrient that is in the shortest supply, even if all other nutrients are abundant. This highlights the importance of balanced nutrient supply.
Nutrients are absorbed through plant roots in either active (energy-dependent) or passive (along concentration gradient) modes, mainly in ionic forms.
Organic manures improve long-term soil health and provide micronutrients, while chemical fertilizers provide quick nutrient availability. Both should be balanced under INM for best results.
🧾 Conclusion: Essential Plant Nutrients PPT
In the journey of growing healthy crops and achieving better yields, understanding essential plant nutrients is not just a chapter—it’s the foundation. Whether you are a BSc Agriculture student or preparing for competitive exams like NABARD, AFO, or JRF, mastering this topic will give you a strong advantage both in theory and in the field.
Through this Essential Plant Nutrients PPT, we’ve tried to simplify complex terms, present them visually, and make your learning journey easier and more practical. Our aim is not just to help you pass exams—but to make you a smarter, more confident agri-professional.
🌱 So, are you ready to strengthen your basics and grow your knowledge?
📘 Explore the full Fundamentals of Agronomy series on our website—each part designed with visuals, explanations, and real exam questions.
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Khumesh, a BSc Agriculture student and founder of AgriGramodaya.com, is on a mission to make “Fundamentals of Agronomy” the easiest and most accessible subject for students across India.
Having personally faced the challenge of finding clear, structured, and visual content for Agronomy, he decided to build a complete one-page resource, breaking down the full syllabus into simple parts — supported by PPTs, summary notes, previous-year MCQs, and exam-oriented insights.
Every part of this subject is designed to help students from zero to advanced level, whether you’re preparing for semester exams or agriculture job exams.
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