📝Additional Field Crop Facts -- One-Liner Exam Bank (Oilseeds, Pulses, Cotton & More)

Competitive exams like AFO, NABARD, and ICAR-NET love to slip in one-liner questions about field crops — a specific test weight, a pollination type, or a marketing season that catches unprepared candidates off-guard. A farmer in Gujarat might never think about the exact test weight of his mustard seed (4.4 g), but that single number has appeared in multiple exam papers. This chapter gathers all those scattered, frequently asked miscellaneous facts into one place — organised by crop group for easy revision.

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Oilseed Crop Facts ^{Frequently Asked in AFO/NABARD}

Oilseed crops carry many easily confused numerical values — test weights, oil percentages, protein contents, and anti-nutritional factors. This section collects the most frequently asked one-liner facts about major oilseeds.

Rapeseed-Mustard

• Seed meal of rapeseed-mustard contains:

• Test weight of Brassica juncea (Indian mustard): 4.4 g — this low test weight reflects the small seed size of mustard, and is a commonly tested one-liner value
• Glucosinolate (2-3% in meal) is an anti-nutritional factor that limits the use of mustard oil cake as animal feed at high levels — it gives mustard its characteristic pungent flavour

Groundnut

Soybean

Sunflower

• Dormancy period: 40-50 days after harvest — seeds will not germinate during this period even under favourable conditions, which is nature’s mechanism to prevent immediate sprouting
• Dormancy broken by: ethrel solution (25 ppm) soaking for 6 hours — ethrel releases ethylene gas which overcomes the dormancy barrier, useful when quick replanting is needed

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Pulse Crop Facts

Pulses are central to Indian agriculture and nutrition, contributing 80-90% of their nitrogen requirement through biological N-fixation. This section covers the quick-reference facts about pulse crops that appear repeatedly in MCQs.

Specific Pulse Facts

• Cowpea is grown for grain, fodder, and green manure (triple purpose) — this versatility makes it one of the most useful legumes in dryland farming systems
• Chickpea is self-pollinated; Pea is often self-pollinated — both can be improved through pure line selection
• Chickpea is used for blood purification; germinated seeds cure scurvy because germination activates vitamin C synthesis
• KCl (MOP) is used to conserve moisture in chickpea — potassium improves stomatal regulation, reducing water loss through transpiration
• Features of legumes: seed produced in pod, hard and large seed coat, N fixation by root nodules via symbiotic Rhizobium bacteria

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Cotton Facts

Cotton has several unique marketing and institutional facts that exams test as one-liners — from the local name for raw cotton to India’s pioneering role in hybrid cotton development.

Cotton Marketing Seasons

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Sugarcane Facts

Sugarcane management involves several specialized practices related to leaf handling. These practices affect both sugar recovery and pest management, and their definitions are commonly confused in exams.

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Potato Facts

The interaction between potassium fertilizer form and tuber quality is one of the most paradoxical facts in agronomy — frequently asked because the recommendation contradicts ground-level practice.

• KCl fertilizer is NOT recommended in solanaceous crops (potato, tobacco)
• Reason: Chloride ions adversely affect dry matter and starch content, causing spongy texture and tendency to blacken after boiling
• Despite this, 97% of K-fertilizer consumption in potato is shared by KCl (MOP) — a paradox frequently tested in exams

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GM Crops — Demerits

While genetically modified crops offer higher yields and pest resistance, they carry several concerns that are frequently listed in exam questions. The four key demerits are:

1. Danger to biodiversity — GM crops may cross-pollinate with wild relatives, potentially disrupting native gene pools
2. Resistance problem — target pests can develop resistance to the inserted gene (e.g., Bt resistance in bollworm), reducing the technology’s long-term effectiveness
3. High cost of production — proprietary GM seeds are expensive, and farmers cannot legally save and replant seed, increasing input costs
4. Hazardous to human health — concerns about allergenicity and long-term health effects remain debated, though no conclusive evidence of harm has been established

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Crop Lodging

Lodging is a major yield-limiting factor in cereal production, and its definition, causes, and prevention are commonly tested.

• Crop lodging is the falling or bending over of a crop due to strong winds, heavy rain, or weak stems — it prevents normal grain filling and makes mechanical harvesting difficult
• Common in tall cereals like wheat, rice, and sugarcane, where plant height increases vulnerability
• Prevented by: shorter varieties (semi-dwarf genes), proper spacing, balanced fertilization (especially avoiding excess nitrogen which causes weak, elongated stems), and application of growth retardants like CCC (Cycocel) in wheat

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Pollination Types — Quick Reference

Knowing the pollination type of each crop is essential for understanding breeding methods — self-pollinated crops are improved through pure line selection and hybridization, while cross-pollinated crops use population improvement and hybrid vigour.

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Summary — Most Tested One-Liners

This quick-reference table compiles the single most tested fact from each topic above — ideal for last-minute revision before an exam.

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Summary Cheat Sheet