Why does the Government of India promote the use of ‘Neem-coated Urea’ in agriculture?
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- ARelease of Neem oil in the soil increases nitrogen fixation by the soil microorganisms
- BNeem coating slows down the rate of dissolution of urea in the soil
- CNitrous oxide, which is a greenhouse gas, is not at all released into atmosphere by crop fields
- DIt is a combination of a weedicide and a fertilizer for particular crops
Show answer
Answer: (B) Neem coating slows down the rate of dissolution of urea in the soil
Answer: (b) Neem coating slows down the rate of dissolution of urea in the soil
Normal urea dissolves quickly - crops absorb only 30-40%, rest is wasted.
Neem-coated urea dissolves SLOWLY, releasing nitrogen gradually so crops absorb more (efficiency improves 15-20%).
Think of it as a 'slow-release capsule' for soil.
Why not others?
(a) Neem doesn't help nitrogen fixation by microorganisms - it slows urea dissolution.
(c) Neem REDUCES nitrous oxide but doesn't eliminate it. 'Not at all' makes this false.
(d) Neem-coated urea is not a weedicide combination.
Additional benefits:
- Reduces diversion of subsidised urea for industrial use;
- Acts as mild insecticide.
Referenced in Economic Survey 2015-16.
Neem-coated urea improves nitrogen use efficiency from 30-40% to around 50-60%, reducing fertilizer subsidy burden which costs the government tens of thousands of crores annually.
The Economic Survey 2015-16 specifically highlighted neem-coated urea policy, making it a relevant current affairs topic for the 2016 exam.
UPSC is testing whether students understand the scientific mechanism behind slow-release fertilizers versus just knowing that neem-coated urea exists as a government scheme.
Neem-Coated Urea
Indian Economy Neem-coated Urea urea nitrogen fixation
Neem-Coated Urea: Mechanism & Benefits for UPSC
Neem coating slows urea dissolution - releases nitrogen gradually for better crop absorption
Improves nitrogen use efficiency from 30-40% to 50-60%
Reduces diversion of subsidized urea to industrial use
Acts as mild insecticide due to neem's natural properties
The Problem
Regular urea dissolves rapidly in soil - crops can absorb only 30-40% of applied nitrogen. The rest is lost through volatilization, leaching, or conversion to greenhouse gases, wasting fertilizer subsidy and harming environment.
Regular vs Neem-Coated Urea
Aspect | Regular Urea | Neem-Coated Urea |
|---|---|---|
Dissolution Rate | Fast (immediate release) | Slow (gradual release) |
Nitrogen Use Efficiency | 30-40% | 50-60% |
Application Frequency | Multiple applications needed | Fewer applications required |
Industrial Diversion | High risk | Reduced (neem smell deters) |
Pest Control | None | Mild insecticidal effect |
How Neem Coating Works
%%{init: {"flowchart": {"wrappingWidth": 460}}}%%
flowchart TD
s1["`**Neem Oil Coating**
Urea granules coated with **neem oil** extract`"]
s2["`**Slow Dissolution**
Coating **delays water penetration** into urea granules`"]
s3["`**Gradual Release**
Nitrogen released **slowly over 45-60 days** vs 7-15 days`"]
s4["`**Better Absorption**
Crops get **steady nitrogen supply** matching growth needs`"]
s5["`**Higher Efficiency**
**15-20% improvement** in nitrogen use efficiency`"]
s1 --> s2
s2 --> s3
s3 --> s4
s4 --> s5Additional Benefits
Economic: Reduces fertilizer subsidy burden by improving efficiency per unit
Environmental: Lower nitrous oxide emissions (though not eliminated completely)
Administrative: Neem smell makes diversion to industries less attractive
Integrated approach: Combines fertilization with mild pest management
Question Analysis
This question tests understanding of controlled-release fertilizers. The correct answer (B) focuses on the core mechanism - slowing dissolution rate. Option A incorrectly links neem to nitrogen fixation by microorganisms, which is unrelated to urea's function.
Trap A: Neem doesn't enhance nitrogen fixation - that's done by Rhizobium bacteria in legume roots, not urea
Trap C: 'Not at all released' is too absolute - neem reduces but doesn't eliminate nitrous oxide
Trap D: Neem-coated urea isn't a weedicide - it's purely a slow-release nitrogen fertilizer
Nitrogen Fertilizers in India
Indian Economy fertilizer nitrogen
Major Nitrogen Fertilizers: Types & Characteristics
Urea contains highest nitrogen content (46%) - most popular fertilizer
DAP and NPK are complex fertilizers with multiple nutrients
India imports 85% of urea requirements despite being major producer
Major Nitrogen Fertilizers
Fertilizer | Nitrogen Content | Other Nutrients | Key Features |
|---|---|---|---|
Urea | 46% | None | Highest N content, water-soluble, most subsidized |
DAP | 18% | P: 46% | Diammonium Phosphate, good for root development |
NPK | Varies | P & K in ratios | Balanced nutrition, multiple grades available |
Ammonium Sulphate | 21% | S: 24% | Also provides sulphur, acidic nature |
CAN | 26% | Ca: 19% | Calcium Ammonium Nitrate, less volatile loss |
Urea Dominance in India
Price advantage: Highest nitrogen per rupee due to heavy subsidies
Farmer preference: Easy to apply, quick visible results on crops
Overuse problem: Leads to nutrient imbalance - excess N, deficient P & K
Policy focus: Government promotes balanced fertilization through soil health cards
Don't confuse nitrogen fertilizers with nitrogen fixation - fertilizers provide external N, fixation captures atmospheric N
Urea has 46% nitrogen - remember this specific number for calculations
DAP is phosphorus-rich (46% P) but has significant nitrogen (18%) too
Fertilizer Subsidy in India
Indian Economy
India's Fertilizer Subsidy: Policy & Challenges
Nutrient Based Subsidy (NBS) for P&K fertilizers since 2010, urea still under statutory pricing
Fertilizer subsidy is ₹80,000+ crore annually - major fiscal burden
Industrial diversion of subsidized urea is major leakage problem
Subsidy Systems
Fertilizer Type | Subsidy Method | Price Control | Key Features |
|---|---|---|---|
Urea | Statutory pricing | MRP fixed by govt | Uniform price across India, highest subsidy per unit |
DAP/NPK | Nutrient Based Subsidy | Market determined | Companies set MRP, govt gives per-nutrient subsidy |
SSP | No subsidy | Market rates | Single Super Phosphate, decontrolled since 1992 |
Policy Challenges
Fiscal burden: Subsidy bill exceeds ₹80,000 crore, straining government finances
Nutrient imbalance: Cheap urea leads to overuse of nitrogen, soil degradation
Leakages: Industrial use of subsidized urea (for making adhesives, plastics)
Import dependence: India imports 85% of urea despite domestic production
Reform Measures
Neem-coated urea: Reduces industrial diversion, improves efficiency
Direct Benefit Transfer (DBT): Piloted for fertilizer subsidy in some states
Soil Health Cards: Promote balanced fertilization based on soil testing
City Compost: Encouraging organic alternatives to reduce chemical dependence
Nitrogen in Soil & Agriculture
Environment nitrogen fixation soil microorganisms
Nitrogen Cycle & Agricultural Applications
Biological nitrogen fixation by bacteria converts atmospheric N₂ to ammonia
Rhizobium bacteria form symbiotic relationship with legume roots
Fertilizers provide readily available nitrogen - different from biological fixation
Atmospheric Nitrogen Challenge
Atmosphere is 78% nitrogen but plants cannot use gaseous N₂ directly. It must be 'fixed' into ammonia (NH₃) or nitrate (NO₃⁻) forms. This happens through biological fixation, industrial processes, or lightning.
Biological Nitrogen Fixation
%%{init: {"flowchart": {"wrappingWidth": 460}}}%%
flowchart TD
s1["`**Atmospheric N₂**
Gaseous nitrogen unavailable to plants`"]
s2["`**Bacterial Enzyme**
**Nitrogenase enzyme** breaks strong N≡N bonds`"]
s3["`**Ammonia Formation**
N₂ converted to **NH₃** (ammonia)`"]
s4["`**Plant Absorption**
Plants absorb NH₃ or oxidized forms (NO₃⁻)`"]
s5["`**Protein Synthesis**
Nitrogen incorporated into amino acids and proteins`"]
s1 --> s2
s2 --> s3
s3 --> s4
s4 --> s5Sources of Soil Nitrogen
Source | Mechanism | Examples | Agricultural Use |
|---|---|---|---|
Biological Fixation | Bacteria convert N₂ to NH₃ | Rhizobium in legume nodules | Crop rotation with pulses |
Industrial Fixation | Haber-Bosch process | Urea, DAP manufacturing | Direct fertilizer application |
Organic Sources | Decomposition releases N | Compost, FYM, green manure | Sustainable farming practices |
Lightning | Electric discharge fixes N₂ | Natural nitrate formation | Minimal contribution |
Legume-Rhizobium Partnership
Symbiotic relationship: Rhizobium gets carbohydrates from plant, provides fixed nitrogen
Root nodules: Visible swellings on legume roots contain nitrogen-fixing bacteria
Crop examples: Pulses (gram, lentil), fodder crops (lucerne, berseem)
Soil enrichment: After harvest, nodules decompose and release nitrogen for next crop
Key distinction: Nitrogen fixation is by bacteria (biological), not by fertilizers (chemical)
Neem doesn't fix nitrogen - it only slows urea dissolution rate
Only leguminous plants have Rhizobium partnership - cereals don't fix nitrogen