Neco Model Questions Vol1 2017 Agricultural Science Question 4

Practice essay / theory question 4 from the 2017 Neco Model Questions Vol1 Agricultural Science examination. This question covers Plant Nutrition .

Neco Model Questions Vol1 2017 Agricultural Science Essay / Theory
Topic: Plant Nutrition
Question 4 NECO_MODEL_QUESTIONS_VOL1 • 2017 • AGRICULTURAL_SCIENCE • essay

A leaf analysis of a 2‑month‑old maize crop gave the following nutrient concentrations on a dry‑weight basis: N = 2.5 %, P = 0.30 %, K = 1.20 %. The recommended optimum concentrations for a high‑yielding maize crop are N = 3.0 %, P = 0.50 %, K = 2.0 %. The topsoil (0–15 cm) has a bulk density of 1.3 g cm⁻³ and the field area is 1 ha.

Question Parts

( a )
Identify which nutrient(s) are deficient in the crop.
( b )
Assuming the farmer wishes to correct the deficiency by applying a single N‑P‑K fertilizer (15‑15‑15) uniformly over the hectare, calculate the amount of fertilizer (in kg) required to raise the deficient nutrient(s) to the recommended level. Use the following assumptions: the soil mass in the top 15 cm = bulk density × depth × area; 1 ha = 10 000 m²; 1 g cm⁻³ = 1 t m⁻³.
( c )
Briefly state two agronomic practices that could help maintain adequate nutrient levels in the long term.

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About This Question

This is Neco Model Questions Vol1 2017 Agricultural Science Question 4. It is one of the essay questions from the 2017 Neco Model Questions Vol1 Agricultural Science examination.

The question covers Plant Nutrition .

View More Neco Model Questions Vol1 2017 Agricultural Science Questions More Neco Model Questions Vol1 Practice Questions Back to Questions

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