What is/are the advantage/ advantages of zero tillage in agriculture? 1. Sowing of wheat is possible without burning the residue of previous crop. 2. Without the need for nursery of rice saplings, direct planting of paddy seeds in the wet soil is possible. 3. Carbon sequestration in the soil is possible. Select the correct answer using the code given below:

Updated 11 Apr 2026 · From UPSC Prelims GS Paper I 2020, Q49

Contents23

UPSC Prelims GS2020Indian Economy

A1 and 2 only
B2 and 3 only
C3 only
D1, 2 and 3

Show answer

Answer: (D) 1, 2 and 3

Zero tillage (also called no-till farming) means planting crops WITHOUT plowing or disturbing the soil.

Let's check each advantage:

Statement 1 (Sowing wheat without burning previous crop residue) — CORRECT:

Zero-till farming allows wheat seeds to be sown directly into the stubble of the previous crop (like rice) without burning the residue.

Technologies like the Happy Seeder make this possible by cutting through crop residue and planting seeds underneath.

Statement 2 (Direct sowing of rice without nursery) — CORRECT:

Direct Seeded Rice (DSR) is a zero-tillage technique where rice seeds are sown directly into the field — either in dry soil, wet soil, or standing water — without the need for raising seedlings in a separate nursery and then transplanting them.

Statement 3 (Carbon sequestration in soil) — CORRECT:

When you don't plow the soil, organic matter stays in place and decomposes slowly, helping to store (sequester) carbon in the soil.

This is good for fighting climate change.

All three are advantages of zero tillage.

Answer: D.

Key Takeaway:

Zero tillage benefits = no burning of residue (Happy Seeder) + direct seeding of rice (no nursery) + carbon sequestration.

It's eco-friendly and cost-effective.

Why this was asked

Zero tillage reduces air pollution from crop residue burning, cuts farming costs by eliminating plowing, and helps store carbon in soil to fight climate change.

UPSC is testing whether students understand that zero tillage involves specific technologies like Happy Seeder for wheat sowing and Direct Seeded Rice technique, not just general environmental benefits.

Zero Tillage Farming

Indian Economy zero tillage no-till farming

Zero Tillage Farming: Technology & Environmental Benefits

Must know

Zero tillage means planting crops without plowing or disturbing the soil

Allows wheat sowing through crop residue without burning using Happy Seeder

Enables Direct Seeded Rice (DSR) without nursery transplantation

Promotes carbon sequestration by keeping organic matter undisturbed in soil

Core Concept

Zero tillage (no-till farming) is a conservation agriculture practice where crops are planted directly into undisturbed soil without plowing, harrowing, or other mechanical soil preparation. This method maintains soil structure and preserves crop residue on the surface.

Zero Tillage vs Conventional Farming

Aspect	Zero Tillage	Conventional Tillage
Soil Preparation	No plowing - direct seeding	Multiple plowing operations
Crop Residue	Retained on field surface	Usually burned or removed
Soil Structure	Preserved - minimal disturbance	Broken down by plowing
Labor & Fuel	Lower input costs	Higher machinery costs
Carbon Storage	Enhanced sequestration	Carbon released to atmosphere
Water Conservation	Better moisture retention	Higher water loss

Key Technologies

Happy Seeder: Machine that cuts crop stubble and plants seeds in single operation

Direct Seeded Rice (DSR): Rice planted directly without nursery transplantation

Super Seeder: Plants seeds while managing heavy residue loads

Turbo Seeder: Used for wheat sowing in rice stubble

Carbon Sequestration Process

%%{init: {"flowchart": {"wrappingWidth": 460}}}%%
flowchart TD
  s1["`**Crop residue retained**
No burning - organic matter stays on soil`"]
  s2["`**Minimal soil disturbance**
No plowing preserves soil layers`"]
  s3["`**Slow decomposition**
Organic matter breaks down gradually`"]
  s4["`**Carbon storage**
Carbon sequestered in soil organic matter`"]
  s1 --> s2
  s2 --> s3
  s3 --> s4

Question Analysis

This question tests all three major benefits of zero tillage mentioned in the PYQ. Statement 1 connects to stubble burning solutions, Statement 2 to DSR technology, and Statement 3 to climate change mitigation through soil carbon storage.

Exam traps

Trap: Confusing zero tillage with minimum tillage - zero means NO plowing at all

Trap: Thinking DSR requires nursery preparation - it's direct seeding without transplantation

Trap: Assuming carbon sequestration only happens in forests - agricultural soils are major carbon sinks

Direct Seeded Rice (DSR)

Indian Economy direct planting paddy seeds rice saplings

Direct Seeded Rice: Technology & Benefits Over Transplanting

Must know

DSR plants rice seeds directly in field without nursery transplantation

Saves 25-30% water compared to transplanted rice

Reduces labor costs by eliminating nursery and transplanting

Good to know

Three types: dry DSR, wet DSR, and water seeded rice

Technology Overview

Direct Seeded Rice (DSR) eliminates the traditional nursery-transplanting system. Seeds are sown directly in the main field using mechanical seeders, avoiding the labor-intensive process of raising seedlings separately and transplanting them.

DSR vs Transplanted Rice

Parameter	Direct Seeded Rice	Transplanted Rice
Nursery Requirement	Not needed	30-35 days nursery
Water Use	25-30% less	Higher water requirement
Labor Cost	40% reduction	High labor for transplanting
Maturity Period	7-10 days earlier	Longer crop duration
Methane Emission	Lower - less flooding	Higher due to continuous flooding
Weed Management	Critical challenge	Easier weed control

Types of DSR

# Direct Seeded Rice
## Dry DSR
- Seeds in dry soil
- Pre-monsoon sowing
- Depends on rainfall
## Wet DSR
- Seeds in puddled soil
- Controlled water
- Better establishment
## Water Seeded
- Pre-germinated seeds
- Standing water
- Uniform distribution

Environmental Benefits

Water conservation: Reduces irrigation requirement by 25-30%

Lower methane emissions: Less continuous flooding reduces greenhouse gases

Energy savings: Eliminates puddling operations for nursery

Soil health: Maintains soil structure better than puddled transplanting

Exam traps

Trap: Assuming DSR needs standing water - dry DSR works without flooding

Trap: Thinking DSR has higher yields - yields are comparable but not necessarily higher

Trap: Confusing with SRI (System of Rice Intensification) - different techniques entirely

Happy Seeder Technology

Indian Economy burning the residue sowing of wheat

Happy Seeder: Solution to Stubble Burning Crisis

Must know

Happy Seeder plants wheat directly into rice stubble without burning

Cuts crop residue and sows seeds in single operation

Addresses stubble burning problem in Punjab-Haryana belt

Good to know

Reduces air pollution and improves soil organic matter

Technology Function

Happy Seeder is a tractor-mounted machine that cuts standing crop residue, lifts it temporarily, places seeds in the soil, and spreads the residue back as mulch. This eliminates the need to burn stubble between rice harvest and wheat sowing.

Happy Seeder Operation

%%{init: {"flowchart": {"wrappingWidth": 460}}}%%
flowchart TD
  s1["`**Residue cutting**
Front rotors cut rice stubble into small pieces`"]
  s2["`**Soil preparation**
Creates furrows for seed placement`"]
  s3["`**Seed sowing**
Plants wheat seeds at proper depth and spacing`"]
  s4["`**Residue spreading**
Spreads cut residue as protective mulch`"]
  s1 --> s2
  s2 --> s3
  s3 --> s4

Benefits Over Burning

Air quality: Eliminates PM2.5 and PM10 emissions from stubble burning

Soil fertility: Residue decomposition adds organic matter and nutrients

Cost saving: No separate residue management or burning costs

Time efficiency: Completes residue management and sowing together

Stubble Management Options

Method	Technology	Environmental Impact	Cost
Happy Seeder	Cuts + plants in one operation	Zero pollution	₹2,500 per hectare
Stubble Burning	Burning after harvest	High air pollution	₹1,500 per hectare
Super Seeder	Heavy residue management	Pollution free	₹3,000 per hectare
Rotavator	Incorporates residue in soil	Environmentally safe	₹4,000 per hectare

Policy Context

Government provides 50-80% subsidy on Happy Seeder purchase to farmers in Punjab, Haryana, and Uttar Pradesh. The technology directly addresses the rice-wheat system's stubble burning problem that contributes to Delhi's winter air pollution crisis.

Exam traps

Trap: Confusing Happy Seeder with Super Seeder - both manage residue but different capacities

Trap: Thinking it only works for wheat - can plant other rabi crops too

Trap: Assuming residue is removed - it's retained as mulch on field surface

Carbon Sequestration in Agriculture

Environment carbon sequestration

Agricultural Carbon Sequestration: Soil as Carbon Sink

Must know

Soil carbon sequestration stores atmospheric CO₂ in soil organic matter

Agriculture can be carbon sink through proper practices

Good to know

No-till farming increases soil organic carbon by 0.1-1 ton per hectare annually

India's soils have potential to sequester 39-49 million tons CO₂ annually

Process Overview

Carbon sequestration in agriculture captures atmospheric CO₂ through photosynthesis and stores it in soil organic matter. When soil is not disturbed (zero tillage), this carbon remains locked in the soil for decades instead of being released back to atmosphere.

Carbon Sequestration Process

%%{init: {"flowchart": {"wrappingWidth": 460}}}%%
flowchart TD
  s1["`**CO₂ absorption**
Plants capture atmospheric CO₂ through photosynthesis`"]
  s2["`**Organic matter formation**
Carbon converted to plant biomass and root exudates`"]
  s3["`**Soil incorporation**
Plant residues and roots decompose in soil`"]
  s4["`**Long-term storage**
Carbon stored as stable soil organic matter`"]
  s1 --> s2
  s2 --> s3
  s3 --> s4

Farming Practices & Carbon Impact

Practice	Carbon Effect	Mechanism	Annual Rate
Zero Tillage	Increases sequestration	Preserves soil organic matter	0.1-1 t C/ha/year
Conventional Tillage	Reduces carbon storage	Accelerates decomposition	-0.5 t C/ha/year
Cover Crops	Enhances sequestration	Continuous carbon input	0.5-1.5 t C/ha/year
Crop Residue Burning	Releases carbon	Direct CO₂ emission	Immediate loss

Factors Affecting Sequestration

Soil disturbance: Tillage breaks soil aggregates and releases stored carbon

Residue management: Burning releases CO₂; retention increases sequestration

Cropping intensity: Higher biomass production = more carbon input

Soil type: Clay soils store more carbon than sandy soils

Agricultural Carbon Practices

# Carbon Sequestration
## Soil Management
- Zero tillage
- Reduced tillage
- Organic amendments
## Crop Management
- Cover crops
- Crop rotation
- Residue retention
## Agroforestry
- Tree planting
- Silvopasture
- Windbreaks

Exam traps

Trap: Thinking only forests sequester carbon - agricultural soils are major carbon sinks

Trap: Confusing carbon capture with carbon sequestration - capture is industrial, sequestration is natural storage

Trap: Assuming all farming releases carbon - sustainable practices can make agriculture carbon negative

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