TNPSC AAO Syllabus 2021 PDF – Download Exam Pattern for AHO Here!!!

TNPSC AAO Syllabus 2021 PDF – Download Exam Pattern for Assistant Agriculture Officer Here!!!

TNPSC AAO Syllabus 2021 PDF – Download Exam Pattern for Assistant AHO. Tamil Nadu Public Service Commission has uploaded the Syllabus for the post of Assistant Agricultural Officer and Assistant Horticultural Officer Vacancies. The Written Examination will be announced soon (Paper I and Paper II). Now candidates who are searching for the TNPSC AAO Syllabus 2020 can download the Tamil Nadu AAO Exam Pattern in our blog. Dear Candidates here we also provide the TNPSC Assistant Agriculture Officer Syllabus pdf AAO Exam Pattern pdf.

TNPSC AAO Syllabus in Tamil

Name of the Board

Tamil Nadu Public Service Commission
Post Name

Assistant Agricultural Officer and Assistant Horticultural Officer



Written Exam Date

Available Soon
Selection Process

Written Exam & Interview


Syllabus Available

TNPSC AAO/ ADH Exam Pattern 2021:

Subject Duration Maximum Marks Minimum Qualifying Marks for selection
SCs, SC(A)s, STs,

MBCs/DCs, BCs and BCMs

1.Assistant Agricultural Officer


Paper – I (200 Questions) Diploma Standard Agriculture (Code No.212)

Paper- II (100 Questions) (Code No.003) General Studies (HSC Standard) – 75 Questions and Aptitude and Mental Ability Test (SSLC Standard) – 25 Questions

3 hours




2 hours






150 200
Total   500
2. Assistant Horticultural Officer


VI. Paper – I (200 Questions) Diploma Standard Horticulture (Code No.277)

3 hours 300  






Paper- II (100 Questions) (Code No.003) General Studies (HSC Standard) – 75 Questions and Aptitude and Mental Ability Test (SSLC Standard) – 25 Questions 2 hours 200
Total   500    

The question paper in Paper – I and II will be set both in Tamil and English.

TNPSC AAO Syllabus 2021 PDF:

Unit -I – Agronomic principles, practices, and meteorology

  • Agriculture
  • Metrology
  • Irrigation
  • Weeds
  • Agronomic Practices including Climatic and Soil Requirement, Land Preparation.

Unit-II – Dry Farming and Agro-Forestry

Dry Farming – Definition and Present Status in Tamil Nadu – Soils of Dry Farming Tracts and their limitation to Crop Production – Major Crops of Dry Land. Suitable Dry Land Technology for increased Crop Productivity – Pre-monsoon sowing – Conventional Crop Production Vs Alternate land Use in Dry Land – Integrated Farming Systems in drylands. Erosion – Classification of Erosion – Water and Wind Erosion – Land Slide – Contour Bund, Graded Bund, Bench Terrace, Contour Stone Wall. Gully Control Structures – Cultivation Practices – Water Harvest – Farm Ponds – Percolation Ponds –Weather aberrations and Contingent Crop Planning – Important Drought Events in Tamil Nadu and their effect on Crop Production; Watershed development – definition and components.

Land use classification – Role of Forests – Indian forests – Status – Classification – Disciplines in Forestry – Agroforestry – Definition – Differences between Agroforestry, Social Forestry, Urban Forestry – Advantages – Agroforestry Systems – Primary Systems – Agrisilviculture, Silvipasture, Agrisilvipasture – Mixed Wood Lots – Sub Systems – Shifting Cultivation – Taungya – Home Gardens – Alley cropping – Wind Break and Shelter Belts – Agroforestry Practices. Constraints in Agroforestry – Trees for Problem Soils – Sand – Sand Dune Stabilisation – Social Forestry Projects in Tamil Nadu –Industrial Agroforestry – Waste land development – types of wastelands and management practices. Management Practices for Multi Purpose Trees (MPT) – Teak.

Unit-III – Soils and Fertility Management Definition of Soil 

Its main components – Soils of Tamil Nadu. Soil Physical Properties – Colour, Texture, Structure, Bulk Density, Pore Space, Soil water, Soil Air, Soil Temperature and their significance in crop production. Soil Chemical Properties – Soil Colloids – Ion-exchange Reactions – Soil Organic Matter and its decomposition – Carbon and Nitrogen Cycles – Soil Micro Organisms – Importance of Organic Matter on Soil Properties. Soil Reaction – Acid, Saline and Alkaline Soils – Their Formation and Reclamation – Soil Pollutants. Soil Fertility – Major, Secondary and Minor Plant Nutrients. Soil Fertility evaluation, Soil Testing and fertilizer recommendations. Fertilizers – Nitrogenous, Phosphatic and Potassic Fertilizers – Complex and Mixed Fertilizers, Efficient use of Fertilizers. Bio-Fertilizers – Groups of Bio-Fertilizers – Bacterial, Fungal, Algal and Azolla. Irrigation water – Qualities of irrigation water – Water testing.

Unit-IV- Horticultural Crop Cultivation Techniques Study of Cultural Practices of the following Fruit Crops with reference to Soil, Climate, Varieties, Methods of Propagation, Cultural, Manurial, Horticultural and Irrigation practices – physiological and nutritional disorders – Training and Pruning – Role of Growth Regulators – Maturity Standards – Methods of Harvesting – Yield. Post harvest Technology – Grading – Packing – Storage. Tropical fruits:- Mango, Banana, Grapes, Papaya, Sapota, Guava, Citrus, Pomegranate, Ber, Annona, Amla and Jack. Subtropical and Temperate fruits: Apple, Pear, Peach, Plum and Pineapple. Propagation methods – sexual, asexual and micro-propagation – merits and demerits – steps in micro-propagation – packing and marketing of tissue culture plants.

Unit-V – Breeding and Seed Production

Field Crops – Importance – Classification – Agricultural and Industrial – Chemical Composition of Economic Parts in the Crops & Cereals, Millets, Pulses, Oilseeds, Fibres, Sugar and Starch Crops. Plant Photosynthesis – Respiration – Translocation of Assimilates. Reproductive and Pollination System in Plants – Mechanisms promoting Self Pollination and Cross-Pollination in crop plants – Genetic Conservation and utilization.

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Unit-VI – Plant Protection Principles and Practices

Insects – Definitions – Characters of Insects – Elementary knowledge of Insect – Dominance of Insects; Mouth Parts – Wings – Legs. Economic Classification of Insects – Sericulture – Rearing of Mulberry silk worms – Apiculture – Role of Bees in Crop Productivity – Hiving Bees and Apiary Management. Beneficial Insects – Insect Pollinators – Predators and Parasitoids. Pest – Definition – Categories of Pests – Pest outbreak – Pest Monitoring – Pest Surveillance – Forecasting – Economic Threshold Level – Economic Injury Level. Pest Management Components – Cultural, Physical, Mechanical, Legal and Integrated Methods – Use of Resistant Varieties, Biological Control – Parasitoids, Predator and Microbial Agents.

Unit-VII- Livestock, Poultry Management, Artificial Insemination and Calf Rearing

Significance of livestock and poultry in Indian economy –Role of livestock and poultry in Indian agriculture – Various systems of livestock production – extensive – semi intensive – intensive – mixed – Integrated farming systems – Manure management methods – Definition of breed – classification of indigenous, exotic cattle and buffaloes – Breed characteristics of Sindhi, Kangeyam and Umblacherry, Jersey, Holstein Fricsian, Murrah and Surti. Breeding – importance of cross breeding.

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What is the Written Exam Date for TNPSC AAO 2021?

The Written Examination will be announced Soon

What is the Selection Process for TNPSC AAO 2021?

The Selection will be based on Written Examination & interviews.

How to Download TNPSC AAO Syllabus 2021 PDF?

Candidates can download the TNPSC AAO Syllabus 2021 PDF from our website.