Which of the following methods is/are suitable for soil conservation in hilly region? 1. Terracing and contour bunding 2. Shifting cultivation 3. Contour ploughing Select the correct answer using the code given below.

1. Basics of Soil Erosion and its Agents (basic)

Soil erosion is the process of denudation (wearing away) of the soil cover and its subsequent washing down by natural agents. Under normal conditions, the processes of soil formation and erosion go on simultaneously, maintaining a delicate balance. However, this equilibrium is often disrupted by human activities such as deforestation, over-grazing, construction, and mining, which expose the land to the elements NCERT Contemporary India II, Soil Erosion and Soil Conservation, p.12.

Running water is the most significant agent of erosion in India, particularly in regions with heavy rainfall. It typically progresses through three stages:

• Sheet Erosion: This occurs when a thin, uniform layer of topsoil is removed over a large area, often after heavy rain on a gentle slope. It is particularly dangerous because it is subtle and removes the most fertile layer of soil.
• Rill Erosion: As water concentrates into small streams, it creates finger-shaped grooves in the land.
• Gully Erosion: When rills deepen and widen, they form deep channels or gullies. This makes the land unfit for cultivation, creating what is known as badland topography or ravines, a classic example of which is found in the Chambal basin Geography of India (Majid Husain), Soils, p.15.

In contrast, wind erosion is most active in arid and semi-arid regions, such as the Thar Desert, where lack of vegetation allows the wind to lift and transport loose soil particles Geography of India (Majid Husain), Soils, p.20. Other agents include glaciers and sea waves. Furthermore, anthropogenic factors like shifting cultivation (jhum) accelerate erosion by clearing forest patches on slopes, leaving the soil vulnerable to the direct impact of rain Geography of India (Majid Husain), Soils, p.15.

Type of Erosion	Primary Agent	Characteristic Feature
Sheet Erosion	Water	Uniform removal of the top layer; often goes unnoticed.
Gully Erosion	Water	Deep channels that create "badlands" or ravines.
Wind Erosion	Wind	Common in dry, flat areas with little vegetation cover.

Sources: NCERT Contemporary India II, Soil Erosion and Soil Conservation, p.12; Geography of India (Majid Husain), Soils, p.14-15; Geography of India (Majid Husain), Soils, p.20

2. Stages of Water Erosion (Sheet to Gully) (intermediate)

Water erosion is not a single event but a progressive sequence that transforms a healthy landscape into degraded terrain. It typically follows a chronological path as the volume and velocity of surface runoff increase. Understanding these stages is crucial for any UPSC aspirant, as it explains why certain regions, like the Chambal Valley, have become completely unproductive for agriculture.

The process begins with Sheet Erosion. This is often called the "insidious" or "silent" stage because it is virtually invisible to the naked eye. When heavy rain falls on bare soil, it detaches particles and washes them away in a uniform, thin layer across a wide area Shankar IAS, Environment, p.369. Because the land looks largely the same after the rain, farmers often don't realize their most fertile topsoil is being depleted until crop yields begin to drop significantly Majid Hussain, Environment and Ecology, Chapter 6, p.18.

As the intensity of rainfall increases or the slope steepens, the water begins to find paths of least resistance. It starts to concentrate into tiny, well-defined channels known as Rills. Unlike sheet erosion, Rill Erosion leaves visible scours or "ribbons" on the landscape Shankar IAS, Environment, p.370. While these small channels can usually be removed by normal tillage (ploughing), they indicate that the erosion process is accelerating and moving toward a much more dangerous stage.

If left unchecked, these rills deepen and widen, eventually forming Gullies. Gully erosion is the most advanced and destructive stage, creating deep, steep-sided trenches that can reach several meters into the soil or bedrock Majid Hussain, Environment and Ecology, Chapter 6, p.18. This leads to the formation of Badland Topography, where the land is so dissected by deep ravines that it becomes impossible to cultivate. A classic Indian example is the Chambal Ravines spanning Rajasthan, Madhya Pradesh, and Uttar Pradesh PMF IAS, Physical Geography, p.235.

Stage	Visibility	Characteristic Feature
Sheet	Invisible/Subtle	Uniform removal of topsoil layer by layer.
Rill	Visible	Small, ephemeral finger-like channels.
Gully	Highly Visible	Deep, permanent trenches; forms ravines.

Sources: Environment, Shankar IAS Academy (10th ed.), Agriculture, p.369-370; Environment and Ecology, Majid Hussain (3rd ed.), Environmental Degradation and Management, p.18; Physical Geography, PMF IAS (1st ed.), Major Landforms and Cycle of Erosion, p.235

3. Broad Strategies of Soil Conservation (basic)

At its heart, soil conservation is not merely about preventing soil from washing away; it is the rational and scientific management of land to ensure it remains healthy and productive for generations to name Environment and Ecology, Majid Hussain (Access publishing 3rd ed.), Chapter 6, p.19. To achieve this, we look at the landscape and decide which strategy fits best. In hilly or mountainous regions, the biggest enemy is gravity. When rain falls on a slope, it gains velocity, turning into a powerful force that strips away the fertile topsoil. To counter this, we use mechanical measures like Contour Ploughing and Terracing.

Contour Ploughing involves farming across the slope (following the natural lines of equal elevation) rather than up and down. Think of these furrows as 'speed bumps' that break the flow of water, giving it time to soak into the ground rather than rushing downhill NCERT, Contemporary India II (Class X), Chapter 1, p.12. Similarly, Terracing involves carving flat 'steps' into steep slopes, a technique famously mastered in the Western and Central Himalayas to create manageable patches for cultivation while checking erosion.

Moving beyond the hills, modern Conservation Agriculture contrasts sharply with conventional methods. While traditional 'modern' farming often relies on heavy machinery and clearing all crop residue, conservation strategies emphasize minimal tillage (disturbing the soil as little as possible) and mulching (keeping the soil surface covered with organic matter) Indian Economy, Vivek Singh (7th ed. 2023-24), Agriculture - Part II, p.353. This approach mimics nature by maintaining a biological cover, which protects the soil from the impact of raindrops and extreme temperatures.

Feature	Conventional Agriculture	Conservation Agriculture
Tillage	Excessive mechanical ploughing	Minimum or No-till (Biological tillage)
Crop Residue	Burning or removal of stalks	Surface retention (Permanent cover)
Cropping	Mono-cropping (Same crop)	Diversified rotations and multi-cropping

Lastly, we must distinguish these helpful strategies from destructive ones like Shifting Cultivation (Jhum). Though a traditional practice, in the modern context of high population pressure, it often leads to massive deforestation and leaves the soil exposed to severe erosion, effectively undoing conservation efforts Exploring Society: India and Beyond (NCERT Class VIII), Natural Resources and Their Use, p.12.

Sources: Environment and Ecology, Majid Hussain (Access publishing 3rd ed.), Chapter 6: Environmental Degradation and Management, p.19; NCERT, Contemporary India II (Class X), Chapter 1: Resources and Development, p.12; Indian Economy, Vivek Singh (7th ed. 2023-24), Agriculture - Part II, p.353; Exploring Society: India and Beyond (NCERT Class VIII), Natural Resources and Their Use, p.12

4. Shifting Cultivation: Practice and Impact (intermediate)

Shifting cultivation, popularly known as 'Slash and Burn' agriculture, is a primitive subsistence practice where small patches of forest are cleared and the remaining vegetation is burnt. This process serves a specific purpose: the resulting ash is rich in potash, which acts as a temporary natural fertilizer to boost the nutrient content of the soil Indian Economy, Nitin Singhania, Agriculture, p. 309. Farmers use rudimentary tools like digging sticks and hoes to cultivate crops for a short period, typically 3 to 5 years. Once the soil loses its fertility, the farmers abandon the patch to allow nature to reclaim it and move to a fresh piece of land FUNDAMENTALS OF HUMAN GEOGRAPHY, CLASS XII (NCERT 2025 ed.), Primary Activities, p. 27. Because this practice is prevalent across tropical regions globally, it carries many local names that are frequently tested in exams. In India, while commonly called Jhumming in the North-east, it is known as Podu or Penda in Andhra Pradesh, Kumari in the Western Ghats, and Khil in the Himalayan belt NCERT (2022). Contemporary India II, The Age of Industrialisation, p. 79. Internationally, it is called Milpa in Central America, Ladang in Indonesia and Malaysia, and Ray in Vietnam FUNDAMENTALS OF HUMAN GEOGRAPHY, CLASS XII (NCERT 2025 ed.), Primary Activities, p. 27. From a conservation perspective, shifting cultivation is now considered unscientific and destructive due to modern population pressure. Historically, the Jhum Cycle—the time a plot is left fallow to regenerate—was long enough for forests to recover. However, this cycle has now shrunk to as little as five years in parts of Nagaland and Meghalaya Geography of India, Majid Husain, Natural Vegetation and National Parks, p. 30. This insufficient recovery time leads to permanent deforestation, massive soil erosion, and a decline in the land's ability to retain water, contributing to both droughts and floods in hilly regions.

Region	Local Name
Mexico & Central America	Milpa
Indonesia/Malaysia	Ladang
Western Ghats (India)	Kumari
Andhra Pradesh (India)	Podu / Penda

Sources: Indian Economy, Nitin Singhania, Agriculture, p.309; FUNDAMENTALS OF HUMAN GEOGRAPHY, CLASS XII (NCERT 2025 ed.), Primary Activities, p.27; NCERT (2022). Contemporary India II, The Age of Industrialisation, p.79; Geography of India, Majid Husain, Natural Vegetation and National Parks, p.30

5. Land Use and Sustainable Agriculture in Hill Regions (intermediate)

In hill regions, the primary challenge to agriculture is topography. Unlike the plains, where water can sit and soak, the steep slopes of mountains turn rainfall into high-velocity runoff. This runoff acts like a conveyor belt, stripping away the fertile topsoil. To manage land sustainably, we must move from 'down-slope' farming to across-the-slope techniques. This is the logic behind Contour Ploughing and Contour Bunding. By ploughing parallel to the contours of the hill, farmers create a series of horizontal 'speed bumps'. These barriers break the momentum of water, allowing it more time to infiltrate the ground rather than washing away the soil Geography of India, Majid Husain, Regional Development and Planning, p.31.

While contouring is an agronomic measure, Terracing is a more intensive mechanical measure where the slope is actually cut into a series of steps. This is a hallmark of Himalayan agriculture and is essential for preventing the formation of gullies. Conversely, practices like Shifting Cultivation (Jhum)—prevalent in Northeast India—are highly destructive in this context. By clearing and burning forest patches, the soil is left 'naked' and exposed to heavy monsoon rains, leading to rapid hydrological deterioration and erosion.

Sustainable management in these areas requires a departure from 'one-size-fits-all' planning. Because the climate, culture, and ecology of hills are unique, the government initiated Hill Area Development Programmes (HADP). These plans target regions above 600 meters to ensure that development is tailored to the specific terrain and resource endowment INDIA PEOPLE AND ECONOMY, NCERT, Planning and Sustainable Development in Indian Context, p.67. Modern initiatives like the National Mission for Sustainable Agriculture (NMSA) further this by promoting integrated farming systems and organic practices through schemes like Paramparagat Krishi Vikas Yojana (PKVY) to make hill farming more climate-resilient INDIA PEOPLE AND ECONOMY, NCERT, Land Resources and Agriculture, p.36.

Method	Mechanism	Primary Benefit
Terracing	Carving flat 'steps' into the hillside.	Prevents massive soil movement and gullying.
Contour Ploughing	Ploughing horizontally across the slope.	Reduces runoff velocity and increases water absorption.
Shifting Cultivation	Slash-and-burn of forest cover.	Negative: Leads to severe topsoil loss and land degradation.

Sources: Geography of India, Regional Development and Planning, p.31; INDIA PEOPLE AND ECONOMY, NCERT, Planning and Sustainable Development in Indian Context, p.67; INDIA PEOPLE AND ECONOMY, NCERT, Land Resources and Agriculture, p.36

6. Techniques: Terracing, Bunding, and Contour Ploughing (exam-level)

When we look at soil conservation in hilly and mountainous regions, we must first understand the physics of water. On a slope, gravity pulls rainwater downward. If the water flows in a straight, uninterrupted line, it gains velocity and kinetic energy, allowing it to detach and carry away the fertile topsoil. To prevent this, our primary objective is to break the flow and reduce the velocity of surface runoff.

Contour Ploughing is one of the most fundamental agronomic measures. Instead of ploughing up-and-down the slope—which creates natural channels for water to rush down—farmers plough across the slope, following the natural contour lines (lines of equal elevation). This creates a series of horizontal ridges and furrows that act as 'speed bumps.' These barriers catch rainwater, slowing it down and giving it more time to infiltrate into the soil rather than washing it away Majid Husain, Geography of India, Chapter 6, p. 23. This technique is highly effective for gentle to moderate slopes NCERT, Fundamentals of Human Geography Class XII, p. 80.

As the slope becomes steeper, we move from simple ploughing to more structural interventions like Terracing and Bunding.

• Terracing: This involves cutting flat 'steps' or platforms into steep hill slopes. By creating these flat areas, we effectively replace a long, steep incline with several short, level segments. This is particularly vital for crops like padi (rice) that require standing water GC Leong, Certificate Physical and Human Geography, Chapter 26, p. 244. A famous Indian example is the Angami tribe of Nagaland, who have mastered terrace farming on slopes as steep as 45° Majid Hussain, Environment and Ecology, Chapter 6, p. 20.
• Contour Bunding: This involves constructing small earthen embankments (bunds) along the contours to create a physical basin. These bunds hold back water and prevent the formation of gullies.

Feature	Contour Ploughing	Terracing
Mechanism	Creates horizontal ridges to slow water flow.	Changes the slope geometry into flat steps.
Slope Suitability	Gentle to moderate slopes.	Moderate to very steep slopes.
Primary Goal	Reducing runoff velocity and increasing infiltration.	Creating cultivable land and controlling erosion on steep gradients.

In contrast to these conservation methods, practices like shifting cultivation (Jhum)—common in North-Eastern India—are highly destructive. By clearing and burning forest cover on slopes, the soil is left completely exposed to heavy tropical rains, leading to rapid degradation and loss of hydrological properties.

Sources: Geography of India, Chapter 6: Soils, p.23; Environment and Ecology, Chapter 6: Environmental Degradation and Management, p.19-20; Fundamentals of Human Geography Class XII (NCERT), International Trade (Glossary/Notes), p.80; Certificate Physical and Human Geography (GC Leong), Chapter 26: Agriculture, p.244

7. Solving the Original PYQ (exam-level)

You have just mastered the core principles of soil dynamics and erosion control, and this question is the perfect test of how those building blocks come together in a real-world scenario. In hilly regions, the primary challenge is the steep gradient, which increases the velocity of surface runoff. To conserve soil, we must implement mechanical and agronomic measures that break the flow of water. Terracing and contour bunding (Statement 1) achieve this by transforming a continuous slope into a series of level steps, while contour ploughing (Statement 3) involves tilling the land across the slope rather than up and down. As highlighted in Contemporary India II (NCERT) and Geography of India by Majid Husain, these techniques act as natural 'speed bumps,' decelerating water and allowing it to soak into the soil instead of carrying away the fertile top layer.

To arrive at the correct answer, (A) 1 and 3 only, you must apply critical elimination—a vital skill for the UPSC Civil Services Exam. A frequent trap used by the commission is to include a practice that is prevalent in a region but harmful to the environment. Shifting cultivation (Statement 2), often called Jhumming, is a classic example. Although it is widely practiced in hilly terrains, it is actually a primary cause of soil degradation because it involves clearing and burning forest cover, leaving the earth exposed to intense erosion. By recognizing that Statement 2 is a source of the problem rather than a solution, you can confidently eliminate options (B), (D), and (C), leaving you with the only logical conservation methods.