Agriculture 2024 Paper I 50 marks Describe

Q3

(a) What is the Arnon and Stout (1939) criteria for plant nutrient essentiality? Give account of forms of each essential plant nutrient element absorbed by plants. 20 marks (b) What do you mean by Forest products? Write about the value added products from forest. 20 marks (c) Give account of soil fertility evaluation techniques. Enlist the points to be considered along with soil test values for fertiliser dose recommendation. 10 marks

हिंदी में प्रश्न पढ़ें

(a) अर्नोन और स्टाउट (1939) द्वारा दिए गए पादप पोषक तत्वों की अनिवार्यता के मानदण्ड क्या हैं ? पौधों द्वारा अवशोषित प्रत्येक आवश्यक पोषक तत्वों के रूपों (फॉर्म) का विवरण दीजिए । 20 (b) वन उत्पादों से आप का क्या तात्पर्य है ? वनों से प्राप्त मूल्यवर्धित उत्पादों के बारे में लिखिए । 20 (c) मृदा उर्वरता मूल्यांकन तकनीकों का विवरण दीजिए । मृदा परीक्षण मूल्यों के साथ उर्वरक खुराक (मात्रा) की सिफारिश के लिए विचार किए जाने वाले बिन्दुओं को सूचीबद्ध करिए । 10

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Directive word: Describe

This question asks you to describe. 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 'describe' demands comprehensive, systematic coverage of each sub-part with factual precision. Allocate approximately 40% of word budget to part (a) given its 20 marks and technical depth, 35% to part (b) for breadth of forest products coverage, and 25% to part (c) for concise enumeration of fertility evaluation techniques. Structure as: brief introduction → detailed treatment of (a), (b), (c) in sequence → concluding synthesis on integrated nutrient management linking all three parts.

Key points expected

  • Part (a): Arnon-Stout three criteria (essentiality, direct involvement, irreplaceability) with clear definition; ionic/ molecular forms of all 17 essential nutrients (macro: N as NO3-/NH4+, P as H2PO4-/HPO42-, K as K+; micro: Fe as Fe2+/Fe3+, Zn as Zn2+, etc.) with valency states
  • Part (b): Definition of forest products (NWFPs vs timber); value-added products categorised as wood-based (plywood, veneer, pulp), non-wood (resins, tannins, essential oils, medicinal extracts), and emerging (bamboo composites, bioactive compounds)
  • Part (c): Soil fertility evaluation techniques—biological (indicator plants, biological assays), chemical (soil testing: pH, EC, available NPK, micronutrients), and visual deficiency symptoms; integration for fertiliser recommendations
  • Part (c): Factors beyond soil test values—crop type and variety, yield target, nutrient use efficiency, soil moisture regime, cropping system, economics, farmer resource endowment, climatic conditions
  • Integration: Link nutrient essentiality (a) to soil fertility evaluation (c) and forest-based organic inputs (b) for sustainable nutrient management

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Precise statement of Arnon-Stout criteria with correct chemical formulae for all nutrient forms; accurate classification of forest products; comprehensive enumeration of fertility evaluation techniques without conceptual errorsBasic criteria stated with minor errors in ionic forms; generic forest product listing; incomplete fertility techniques with some confusion between methodsIncorrect or incomplete criteria, wrong chemical forms, confused product categories, or fundamental misunderstanding of fertility evaluation purpose
Quantitative reasoning15%7.5Specific nutrient concentration ranges (critical levels), soil test rating categories (low-medium-high), fertiliser calculation frameworks (kg nutrient/tonne yield target), and yield response data where relevantGeneral mention of sufficiency ranges without specific figures; qualitative description of soil test interpretation without numerical benchmarksAbsence of quantitative data where expected; arbitrary or incorrect numerical values for nutrient levels or recommendations
Indian context examples20%10Indian forest products (tendu leaves for beedi, sal seeds, mahua flowers, bamboo from NE states, sandalwood oil from Karnataka); ICAR soil test crop response (STCR) equations; state-specific fertility maps (e.g., zinc deficiency in Punjab, boron in Tamil Nadu); ICFRE/ITTO value addition initiativesGeneric Indian references without specificity; mention of common products without regional identification; standard soil testing labs without STCR methodologyWestern-centric examples only; complete absence of Indian agricultural research institution contributions or regional soil fertility patterns
Diagram / process20%10Nutrient uptake mechanism diagram (active/passive transport); forest product value chain flowchart; soil fertility evaluation decision tree; nutrient deficiency symptom identification key; fertiliser recommendation algorithmSimple tabular presentation of nutrient forms; basic list without visual hierarchy; attempted but incomplete process descriptionNo diagrams, tables, or structured flow where highly expected (especially for nutrient forms and fertility evaluation workflow)
Policy / extension angle20%10Soil Health Card Scheme integration with fertility evaluation; National Bamboo Mission for value addition; organic manure promotion linking forest products to nutrient supply; precision agriculture/ site-specific nutrient management; FCO standards for fertiliser qualityMention of Soil Health Card without elaboration; generic sustainable agriculture reference without policy specificityPurely academic treatment without any policy, extension, or farmer-centric application; failure to connect technical content to implementation mechanisms

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