Agriculture 2023 Paper I 50 marks Discuss

Q4

(a) Discuss the primary pathways of gaseous nitrogen losses from soil and the factors affecting nitrogen losses. (20 marks) (b) Discuss the following in relation to groundnut: (i) Role of macro- and micro-nutrients (ii) Pegging (iii) Critical growth stages for irrigation (iv) Weed management (v) Region-specific cropping systems (20 marks) (c) Give a brief note on GIS-based soil mapping and yield mapping. (10 marks)

हिंदी में प्रश्न पढ़ें

(a) मृदा से गैसों के रूप में नाइट्रोजन हानियों के प्राथमिक तरीकों और नाइट्रोजन हानियों को प्रभावित करने वाले कारकों का वर्णन कीजिए। (20 अंक) (b) मूंगफली के संबंध में निम्नलिखित का वर्णन कीजिए : (i) स्थूल-एवं सूक्ष्म-पोषक तत्वों की भूमिका (ii) पैगिंग (iii) सिंचाई की क्रांतिक वृद्धि अवस्थाएं (iv) खरपतवार प्रबंधन (v) क्षेत्र-विशिष्ट फसल प्रणालियां (20 अंक) (c) जी० आई० एस०-आधारित मृदा मानचित्रण एवं उपज मानचित्रण पर एक संक्षिप्त टिप्पणी दीजिए। (10 अंक)

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Directive word: Discuss

This question asks you to discuss. The directive word signals the depth of analysis expected, the structure of your answer, and the weight of evidence you must bring.

See our UPSC directive words guide for a full breakdown of how to respond to each command word.

How this answer will be evaluated

Approach

The directive 'discuss' demands a comprehensive, analytical treatment with cause-effect linkages and interconnections. Allocate approximately 40% time/words to part (a) on nitrogen losses (20 marks), 40% to part (b) on groundnut cultivation covering all five sub-components (20 marks), and 20% to part (c) on GIS mapping (10 marks). Structure with a brief integrated introduction, then tackle each part sequentially with clear sub-headings, and conclude with synthesis on precision agriculture and sustainable nutrient management.

Key points expected

  • Part (a): Ammonia volatilization, denitrification (N2, N2O, NO), and chemo-denitrification as primary gaseous loss pathways; factors including soil pH, temperature, moisture, C:N ratio, tillage, and fertilizer type
  • Part (b)(i): Groundnut's high Ca requirement for pod filling, Mo for N-fixation, and B for pollen viability; N-P-K ratios and micronutrient deficiencies specific to Indian soils
  • Part (b)(ii): Pegging process—geotropic growth of gynophore, its penetration into soil, and criticality of soil crusting/compactness on pod development
  • Part (b)(iii): Critical irrigation stages: pegging, flowering, and pod development; moisture stress impact on shelling percentage and oil content
  • Part (b)(iv): Weed management—critical weed-free period (30-45 DAS), herbicides like pendimethalin/fluchloralin, and integrated approaches including intercropping
  • Part (b)(v): Region-specific systems: Gujarat (kharif groundnut), Tamil Nadu (rice-groundnut rotation), Andhra Pradesh (groundnut-redgram intercropping), and rabi groundnut in Rayalaseema
  • Part (c): GIS-based soil mapping—SSURGO/STATSGO equivalents, DSM techniques, yield mapping through GPS-enabled combine harvesters, variable rate application, and NDVI integration for site-specific management
  • Cross-cutting: Link nitrogen use efficiency improvements to groundnut's biological N-fixation, and GIS applications for targeted nutrient management in groundnut belts

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Accurately distinguishes between volatilization vs. denitrification mechanisms; explains nitrification-denitrification coupling; correctly identifies Ca as unique macronutrient for groundnut pod development; describes gynophore geotropism precisely; defines DSM and yield monitoring correctlyLists nitrogen loss pathways but confuses NO3- leaching with gaseous losses; mentions groundnut needs Ca but without physiological basis; describes pegging vaguely; equates GIS with mere computer mappingConfuses nitrogen loss pathways (calls leaching 'gaseous'); omits Ca specificity for groundnut; describes pegging as 'root growth'; fundamental errors in GIS terminology
Quantitative reasoning15%7.5Cites N loss percentages (volatilization 15-30% of applied N, denitrification 5-10%); groundnut water requirements (500-700mm); critical Ca levels in pegging zone (400-500 ppm); GIS resolution specifications (sub-meter for precision agriculture)Mentions 'significant losses' without ranges; states groundnut needs 'adequate' water without quantities; vague on GIS scale/resolutionNo quantitative data; incorrect figures (e.g., claims 80% N loss through volatilization); confuses units or orders of magnitude
Indian context examples20%10References IARI research on nitrification inhibitors (DCD, neem-coated urea); cites Junagadh Agricultural University work on groundnut; mentions Gujarat's 'Groundnut Bowl' status; references NBSS&LUP soil mapping; cites Bhoochetna/Bhoosamrudhi programs for GIS adoptionMentions India generally without specific institutions/regions; names Gujarat for groundnut but no specifics; generic reference to 'soil health cards'No Indian examples; uses only international references (Midwest US for GIS); treats groundnut as generic crop without Indian agro-ecological specificity
Diagram / process20%10Sketches nitrogen cycle with gaseous loss arrows; illustrates pegging process with gynophore penetration diagram; draws GIS workflow from data acquisition to variable rate application; labels critical clearlyDescribes processes verbally without diagrams; attempts flowchart for nitrogen losses but incomplete; mentions 'can draw' without executionNo diagrammatic representation; disorganized description of sequential processes; confuses pegging with flowering
Policy / extension angle20%10Links N losses to PM PRANAM and Nutrient Based Subsidy policy; connects groundnut cultivation to NMEO-Oilseeds; discusses GIS for precision agriculture under National Mission on Agricultural Extension & Technology; suggests farmer advisories through KVKsMentions 'sustainable agriculture' generically; references soil health card without linking to GIS; policy mention without integrationNo policy/extension linkage; purely academic treatment; ignores government schemes entirely

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