ZIMSEC O-Level Agriculture
5.2.6Soil fertility
Soil fertility in ZIMSEC O-Level Agriculture: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic105 practice questions5 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 5.2.6.1Form 1: explain the functions of major and minor plant nutrients and the effects of their under-supply and over-supply.
- 5.2.6.2Form 2: distinguish organic from inorganic fertilisers, describe the types of each and differentiate compound from straight fertilisers.
- 5.2.6.3Form 3: describe methods of fertiliser application, differentiate basal from top dressing and calculate fertiliser quantities for a given area.
- 5.2.6.4Form 3: explain the importance and principles of soil sampling and sample soil by at least one method.
- 5.2.6.5Form 3: describe how soil pH is tested and interpreted, discuss its influence on crops, identify types of lime and explain liming and how lime differs from fertiliser.
- 5.2.6.6Form 4: describe the nitrogen cycle.
Lessons
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Inorganic fertilisers and how to apply them
35 min
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Organic manures: kraal manure, compost and green manure
30 min
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Plant nutrients: functions, deficiency and oversupply
30 min
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Soil sampling, soil pH and liming
30 min
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The nitrogen cycle and soil fertility
25 min
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Sample question
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