Soil Fertility: JAMB Agricultural Science Questions, Answers & Notes

What Soil Fertility covers in the JAMB Agricultural Science syllabus

Soil fertility is the ability of soil to supply the nutrients plants need. Macronutrients are needed in large amounts — nitrogen (leafy growth), phosphorus (roots and seeds) and potassium (disease resistance, fruit quality) — while micronutrients (trace elements like iron, zinc) are needed in small amounts; deficiency causes symptoms like chlorosis (leaf yellowing). Soil pH (acidity/alkalinity) affects nutrient availability, and acidic soil is corrected by liming. Fertility is maintained by adding organic manure (nutrients + humus), chemical fertilisers (N, P, K), green manuring, growing legumes (which fix nitrogen), crop rotation, fallowing (resting the land) and avoiding continuous cropping and overuse of chemicals — all to ensure good crop yields season after season.

For Soil Fertility, JAMB expects you to be able to:

• Define soil fertility and plant nutrients (macro/micronutrients: N, P, K)
• Explain deficiency symptoms, soil pH and liming
• Describe methods of maintaining fertility (rotation, fallowing, manuring, legumes)

Key facts & revision notes: Soil Fertility

These are the recurring points our Soil Fertility questions test — revise them until each feels automatic, then practise the questions above to lock them in.

• Soil fertility is the ability of soil to supply the nutrients needed for healthy plant growth.
• The primary macronutrients are nitrogen (N), phosphorus (P) and potassium (K).
• Nitrogen promotes leafy/vegetative growth (leaves and stems).
• Phosphorus aids root development and seed/fruit formation.
• Micronutrients (trace elements, e.g.
• iron, zinc) are needed in small amounts.
• Chlorosis is the yellowing of leaves, often caused by nutrient deficiency (e.g.
• Organic manure adds nutrients and humus, improving fertility and soil structure.
• Chemical fertilisers directly supply plant nutrients such as N, P and K.
• Legumes (with rhizobium bacteria in root nodules) fix atmospheric nitrogen, enriching the soil.
• Crop rotation alternates different crops on the same land to maintain fertility and control pests.
• Fallowing rests the land, allowing it to naturally regain fertility.
• Continuous cropping without replenishment depletes and lowers soil fertility.
• Soil pH measures acidity or alkalinity, affecting nutrient availability to plants.
• Adding lime (liming) raises soil pH, correcting acidity.
• Green manuring grows plants (often legumes) and ploughs them into the soil to add organic matter/nutrients.
• Crop rotation, manuring, fallowing and adding fertilisers help maintain soil fertility.
• Potassium improves disease resistance, water regulation and the quality of fruits.
• Overusing chemical fertilisers can degrade soil structure and pollute water bodies.
• A fertile soil has adequate nutrients, good structure, suitable pH and enough organic matter.
• Maintaining soil fertility ensures sustained good crop yields season after season.

Worked examples

Three Soil Fertility questions with the answer and a short explanation, so you can see how the topic is set before you practise the full set.

How Soil Fertility is tested in JAMB Agricultural Science

Our Soil Fertility bank holds 20 questions (11 medium, 9 hard). JAMB Agricultural Science typically returns to Soil Fertility year after year, so steady practice on this topic is high-value revision. Questions are multiple-choice with four options, and at UTME pace you get roughly 40 seconds each — which is why timed practice matters.

How to answer Soil Fertility questions

Work the stem first and predict the answer before you look at the options; then eliminate the ones that contradict the key facts above. Watch for “which is not…”, “all of the above” and “except” style stems, which are where rushed candidates lose easy marks on Soil Fertility. If a calculation or a precise definition is involved, work it from first principles rather than guessing from a half-remembered rule. When two options look right, re-read the stem for the qualifier that separates them — JAMB rarely repeats an option by accident. If you are still unsure, eliminate the two weakest choices to lift your odds, flag the question, and move on; never burn a full minute on one Agricultural Science item when the exam gives you about forty seconds each. Then come back to flagged questions with whatever time remains. The single most reliable way to get faster at Soil Fertility is repeated timed practice, so use the button above until the recurring patterns feel automatic.

Common mistakes to avoid in Soil Fertility

The errors that cost marks on Soil Fertility are usually careless rather than conceptual: misreading a negative stem, confusing two similar terms, or rushing a definition you actually know. Candidates also over-rely on “expo” and last-minute cramming instead of understanding the topic — which fails the moment JAMB rephrases a familiar idea. Treat every option as a claim to be checked against the facts above, keep your working tidy for any calculation, and don’t change a considered answer on a hunch. Above all, revise Soil Fertility actively by answering questions, not just by re-reading notes — recall under time is what the exam rewards.

Frequently asked questions

Is Soil Fertility part of the JAMB Agricultural Science syllabus?

Yes. Soil Fertility is a recognised topic in the JAMB Agricultural Science syllabus, covering define soil fertility and plant nutrients (macro/micronutrients: N, P, K). You should be able to recall its key facts and apply them to multiple-choice questions.

How many Soil Fertility questions can I practise on Belmadeng?

There are 20 original, JAMB-standard Soil Fertility questions in our free bank, each with the correct answer and a worked explanation. You can practise them untimed or as a timed test.

What are the most important points to know about Soil Fertility?

Soil fertility is the ability of soil to supply the nutrients plants need. Macronutrients are needed in large amounts — nitrogen (leafy growth), phosphorus (roots and seeds) and potassium (disease resistance, fruit quality) — while micronutrients (trace elements like iron, zinc) are needed in small …

How do I answer Soil Fertility questions quickly in JAMB?

Read the stem carefully, eliminate clearly wrong options, and match the remaining choices to the key facts for Soil Fertility. Practising timed Soil Fertility questions builds the speed you need for UTME's pace of about 40 seconds per question.

Are these JAMB Agricultural Science Soil Fertility questions past questions or original?

They are original questions written to JAMB (UTME) standard and mapped to the official syllabus — not reproduced past papers. This keeps them legal to use freely while closely mirroring how the real exam tests the topic.

Where can I practise Soil Fertility questions free without signing up?

Right here — tap “Start Soil Fertility practice” on this page to begin instantly. Belmadeng's CBT practice is completely free and needs no sign-up, download or subscription.

About these questions: original, JAMB-standard items written from the official UTME Agricultural Science syllabus (last reviewed 2026-09-18). Belmadeng is an independent study platform and is not affiliated with JAMB. Spotted an error? Use the report link.