ICAR AICE-PhD 2026 Agronomy Chapter-Wise Weightage: High-Frequency Topics

ICAR AICE-PhD 2026 Agronomy paper allocates maximum weightage to Cropping Systems and Crop Production (~17–18%), followed by Weed Science (~12–15%) and Water Management (~10–12%), based on trends observed in previous year question papers.

The ICAR AICE-PhD (All India Combined Entrance Examination for PhD) is conducted by NTA for admission to PhD programmes at ICAR institutes including IARI, NDRI, and other deemed universities under ICAR. The Agronomy subject paper comprises 150 multiple-choice questions carrying 150 marks. Understanding chapter-wise weightage helps you prioritise your study plan and spend more time on high-yield topics rather than spreading effort evenly across all chapters.

• The Agronomy paper has 150 MCQs worth 150 marks with negative marking of 1/3 for each wrong answer.
• Cropping Systems and Crop Production Technology consistently dominates with 25–28 questions across previous years.
• Weed Science typically contributes 18–22 questions, making it a high-priority chapter.
• Water Management, Nutrient Management, and Crop Physiology together account for nearly 30–35% of total questions.
• Numerical questions from IW:CPE ratio, LER, LAI, and evapotranspiration calculations appear every year and require regular practice.

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ICAR AICE-PhD 2026 Agronomy Paper Overview

The ICAR AICE-PhD Agronomy paper tests your knowledge across core areas of crop production science. NTA conducts the exam and the question paper is based on the ICAR PG syllabus for Agronomy. Knowing the paper structure helps you align your chapter-wise preparation with the actual exam format.

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ICAR AICE-PhD 2026 Agronomy Chapter-Wise Weightage Table

The table below shows the estimated chapter-wise weightage for the ICAR AICE-PhD Agronomy paper, derived from analysis of previous year question papers from 2019 to 2024. These numbers are expected based on observed trends and actual distribution may vary in 2026.

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High-Frequency Topics from Previous ICAR AICE-PhD Agronomy Papers

Certain subtopics appear almost every year across all ICAR AICE-PhD Agronomy previous papers. You should study these first and aim to answer all such questions correctly before moving to lower-priority areas.

1. Cropping Systems and Crop Production Technology

This is the single largest topic group in the Agronomy paper. Questions typically cover:

• Land Equivalent Ratio (LER) — calculation and interpretation in intercropping systems
• Types of multiple cropping: intercropping, mixed cropping, relay cropping, and sequence cropping
• Crop rotation principles — benefits, allelopathy, soil health, and nitrogen build-up
• Production technology for major crops: rice, wheat, maize, soybean, and pulses
• Cropping intensity and index of multiple cropping (IMC)

2. Weed Science and Management

Weed Science consistently accounts for 12–15% of questions based on previous year trends. Frequently tested subtopics include:

• Critical period of weed competition (CPWC) for major crops
• Weed index, weed control efficiency, and weed density calculations
• Classification of herbicides by mode of action, selectivity, and timing
• Pre-emergent vs post-emergent herbicide application and examples
• Integrated weed management and biological weed control

3. Water Management and Irrigation

Water management questions focus on both theoretical concepts and numerical problems. You must be comfortable with formula-based questions here:

• IW:CPE ratio — definition, calculation, and standard values for major crops
• Critical stages of irrigation for rice, wheat, maize, and groundnut
• Water use efficiency (WUE) and water productivity calculations
• Drip and sprinkler irrigation — advantages, limitations, and suitability
• Consumptive use and evapotranspiration methods (Penman, Blaney-Criddle)

4. Soil and Nutrient Management

This chapter tests your understanding of fertilizer application strategies and nutrient dynamics under different cropping conditions:

• 4R Nutrient Stewardship: Right source, Right rate, Right time, Right place
• Split application of nitrogen and timing for different crops
• Nutrient use efficiency (NUE) — agronomic efficiency, recovery efficiency, and physiological efficiency
• Integrated nutrient management (INM) — combining organic and inorganic sources
• Micronutrient deficiency symptoms and corrective measures for zinc, boron, and iron

5. Crop Physiology and Growth Analysis

Crop physiology questions are predominantly numerical and formula-based in the ICAR AICE-PhD paper. Study the formulas and their practical interpretation:

• Growth indices: LAI (Leaf Area Index), CGR (Crop Growth Rate), RGR (Relative Growth Rate), NAR (Net Assimilation Rate)
• Yield components of major crops and their interrelationships
• Photosynthesis pathways: C3, C4, and CAM plants and their agronomic significance
• Source-sink relationships, photoperiodism, and thermoperiodism
• Dormancy, vernalisation, and flowering physiology in field crops

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Other Important Chapters with Moderate Weightage

These chapters each contribute 5–9% to the paper and should not be skipped. Together they can add 25–35 marks to your total score, which can be decisive for rank improvement.

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Preparation Strategy Based on ICAR AICE-PhD Agronomy Weightage

A marks-oriented strategy for ICAR AICE-PhD Agronomy 2026 should be built around the weightage distribution rather than following the textbook sequence chapter by chapter.

• Phase 1 — High-weightage chapters first (Weeks 1–4): Spend 60% of your preparation time on the top five chapters — Cropping Systems, Weed Science, Water Management, Nutrient Management, and Crop Physiology. These five topics alone can account for 75–95 questions based on previous year trends.
• Phase 2 — Medium-weightage chapters (Weeks 5–7): Cover Dryland Agriculture, Tillage, Agricultural Meteorology, Seed Technology, and Sustainable Agriculture. Focus on formulas and standard values — ET rates, seed germination standards, thermal unit accumulation.
• Phase 3 — Revision and mock tests (Weeks 8–10): Attempt previous year papers topic-by-topic and full-length mock tests. Identify chapters where accuracy is low and revise selectively. Allocate extra revision time to numerical-heavy areas like IW:CPE, LER, LAI, and ET calculations.
• Daily numerical practice is non-negotiable: Growth analysis (LAI, CGR, NAR), water use efficiency, and fertilizer calculations appear every year. These cannot be memorised — they require regular problem-solving practice to build speed and accuracy.
• Low-weightage topics (Climate Change, Precision Agriculture, Post-harvest Technology): Spend 2–3 days of light reading on standard notes only. Do not over-invest here at the cost of high-weightage chapters where scoring potential is much higher.