Plants require 17 essential elements, categorized by structural importance and volume: Carbon (C), Hydrogen (H), Oxygen (O).

Deep water rice varieties contain the "Sub1A" gene for submergence tolerance.

by Dr. Ram Swaroop Meena and Sandeep Kumar Sihag is a cornerstone resource for students preparing for high-level agricultural exams in India, including the ICAR-JRF, SRF, NET, ARS, and various Ph.D. entrance tests. The 2021 edition, published by Jain Brothers , specifically refined its content to match evolving exam patterns, consolidating vast scientific data into a concise, factual format. Core Focus Areas

Create physical or digital flashcards for numerical data, such as standard seed rates (in

Understanding soil dynamics and plant nutrition is essential for solving objective exam questions. Essential Plant Nutrients

Agronomy, the backbone of agriculture, is the science of crop production and soil management. It is also the highest-scoring section in most agricultural competitive exams. However, the syllabus is vast—covering everything from cropping patterns and irrigation management to weed control and sustainable farming.

Nitrogen (N), Phosphorus (P), Potassium (K).

Stomata closing type: Phenyl Mercuric Acetate (PMA), Atrazine. Film-forming type: Hexadecanol, Mobilaf, Silicon.

: Multiple Choice Questions (MCQs), Model Question Papers, and previous years' papers (e.g., ICAR JRF Agronomy 2019-2020). AI responses may include mistakes. Learn more

Plants that are always weeds (e.g., Cyperus rotundus ). Relative weeds: Rice plants growing inside a wheat field.