Botswana JCE Agriculture (Syllabus 16) cheat sheet

Agriculture is the science and practice of cultivating soil, growing crops and rearing animals for food, fibre and income; it has four branches: crop production (agronomy), animal production, horticulture and agricultural engineering.

Botswana's climate is semi-arid: mean annual rainfall ranges from about 650 mm in the north-east (Chobe) to under 250 mm in the south-west (Kgalagadi); about 90% of rain falls between November and March.

The main soil-rainfall zones are: hardveld (eastern belt, higher rainfall, arable cropping), sandveld (central and western Kalahari, sandy soils, mainly livestock and wildlife), and the Okavango/Chobe wetland areas in the north.

Agriculture contributes roughly 2-3% of Botswana's GDP but supports the livelihoods of a much larger share of the rural population; the sector is dominated by cattle ranching and sorghum/maize/millet cropping.

Environmental factors limiting crop growth in Botswana: low and erratic rainfall, high evaporation (often over 2000 mm per year), short growing season (90-150 days), poor sandy soils and recurrent drought.

Land tenure categories: tribal (communal) land held under customary allocation, state land (including national parks and game reserves) and freehold farms; communal grazing areas are managed through cattle posts and syndicates.

Farmers classify crops by life cycle: annuals (maize, sorghum, cowpea), biennials (onion, carrot) and perennials (citrus, mango, pasture grasses such as buffel grass).

Agriculture's role in the economy includes food security, employment, raw materials for agro-industry, foreign exchange from beef exports and rural development through backward and forward linkages.

Soil profile horizons: O (organic litter), A (topsoil, humus-rich), B (subsoil, accumulation of clay/iron), C (weathered parent material) and R (bedrock); the A horizon is the zone of greatest root and biological activity.

Soil texture is the relative proportion of sand (2.0-0.05 mm), silt (0.05-0.002 mm) and clay (<0.002 mm); the texture triangle classifies soils into sandy, loamy and clayey groups.

Botswana's sandveld soils are typically deep, well-drained, low-fertility arenosols with low cation exchange capacity and low water-holding capacity; hardveld soils include more clayey, more fertile luvisols and vertisols.

Soil pH affects nutrient availability: most crops grow best at pH 5.5-7.0; strongly acid soils (pH <5.5) reduce phosphorus availability and can release toxic aluminium, while alkaline soils (pH >7.5) reduce availability of iron, zinc and manganese.

The three major plant nutrients (N, P, K) are called macronutrients; nitrogen promotes leafy growth, phosphorus promotes root development and flowering, and potassium improves disease resistance and fruit quality.

Soil erosion by water is controlled by contour ploughing, terracing, strip cropping, mulching and maintaining vegetation cover; wind erosion is controlled by shelterbelts, cover crops and avoiding overgrazing.

Soil organic matter improves structure, water-holding capacity and nutrient supply; it is maintained by adding manure or compost, growing green manures (e.g. cowpea) and minimising burning and excessive tillage.

Soil sampling for fertility testing should follow a zig-zag pattern across the field, take 15-20 sub-samples from the top 15-20 cm, mix them, and send a composite sample (about 500 g) to a laboratory.

Crop husbandry operations in sequence: land clearing, primary tillage (ploughing), secondary tillage (harrowing), planting, fertiliser application, weeding, pest and disease control, harvesting, threshing and storage.

Sorghum, maize, pearl millet and cowpea are the main arable crops in Botswana; sorghum and millet are more drought-tolerant than maize and are therefore preferred in low-rainfall areas.

Seed quality criteria: high germination percentage (above 85%), freedom from weed seeds and disease, correct variety for the agro-ecological zone, and correct seed rate for the target plant population.

Plant population is calculated as: plants per hectare = (plant spacing within row × between rows)⁻¹ × 10 000 m²; e.g. 0.75 m × 0.30 m gives about 44 444 plants per hectare.

Weed control methods: mechanical (hand hoeing, cultivation), cultural (crop rotation, timely planting, mulching, competitive crop varieties) and chemical (selective herbicides applied at the correct growth stage).

Irrigation methods used in Botswana include furrow, sprinkler and drip; drip irrigation is the most water-efficient because it delivers water directly to the root zone and reduces evaporation and weed growth.

Harvesting and post-harvest handling: harvest at correct maturity, dry grain to about 12-13% moisture, store in clean, dry, airtight containers off the ground, and control storage pests such as weevils and larger grain borer.

Crop rotation with legumes (cowpea, groundnut, lucerne) fixes atmospheric nitrogen through Rhizobium bacteria and breaks pest and disease cycles, improving yields of the following cereal crop.

Botswana's livestock sector is dominated by cattle (Tswana and Tuli breeds are indigenous and adapted to local conditions); goats, sheep, donkeys and poultry are also important, especially for smallholders.

Digestive systems: cattle, sheep and goats are ruminants with a four-chambered stomach (rumen, reticulum, omasum, abomasum) that ferments fibrous feed; pigs and poultry are monogastric and need more concentrated feed.

The Tswana cattle breed is characterised by hardiness, tick tolerance, good walking ability and adaptation to extensive grazing; crossbreeding with exotic breeds (e.g. Brahman, Simmental) improves growth but requires better management.

Animal identification and traceability are compulsory in Botswana: cattle must be branded and ear-tagged, and all movements are recorded through the Botswana Animal Identification and Traceability System.

Essential nutrients in livestock diets: water, energy (carbohydrates and fats), protein (for growth, milk and reproduction), minerals (calcium, phosphorus, salt) and vitamins; water is the most critical nutrient.

Breeding terms: gestation period is about 283 days in cattle, 150 days in goats and sheep, and 114 days in pigs; oestrus cycle is about 21 days in cattle and 17-21 days in sheep and goats.

Good animal husbandry includes adequate grazing or supplementary feeding, clean water, shelter from sun and rain, disease control (vaccination, dipping, deworming) and humane handling to reduce stress.

Livestock production systems in Botswana: extensive communal grazing (cattle posts), commercial ranching on freehold farms, feedlot finishing for beef export, and intensive small-scale poultry and pig production.

Hand tools are classified by function: cutting tools (hoe, axe, panga, sickle, secateurs), digging tools (spade, fork, mattock), carrying tools (basket, wheelbarrow) and measuring tools (tape, measuring rod).

Implements are classified by power source and operation: primary tillage implements (mouldboard plough, disc plough), secondary tillage implements (harrow, cultivator, roller) and planting/fertiliser implements (seed drill, planter).

A mouldboard plough inverts and pulverises soil to bury weeds and crop residues; a disc plough is better suited to hard, dry or stony soils because discs roll over obstacles.

Tractor maintenance tasks include checking engine oil, coolant, hydraulic oil, tyre pressure, air filter and battery terminals before use, and greasing moving parts at the recommended intervals.

Calibration of a knapsack sprayer: measure the output of one nozzle for a set time, calculate the spray volume per hectare, and adjust nozzle size, pressure or walking speed to deliver the recommended dose.

Safety rules for machinery: keep guards in place, never reach into moving parts, switch off the engine before servicing, use the three-point linkage correctly, and wear protective clothing and ear protection.

A seed drill places seed at a uniform depth and spacing and can apply fertiliser at the same time; the correct depth for most small grains is 3-5 cm in moist soil.

Machine field capacity is calculated as: field capacity (ha/h) = (working width in m × speed in km/h) ÷ 10, giving the theoretical area covered per hour.

Farm structures are classified as: production structures (greenhouse, nursery, milking parlour), storage structures (grain silo, hay shed, cold room), animal housing (kraal, poultry house, pigsty, calf pen) and service structures (workshop, store, dipping tank).

A good farm building should provide adequate ventilation, protection from sun and rain, good drainage around the site, easy access for machinery, and be sited away from low-lying flood-prone areas.

Grain storage structures must keep grain dry, cool and free from pests; a moisture content above 13-14% encourages mould and insect multiplication.

Poultry houses need about 0.1-0.15 m² of floor space per bird for broilers and adequate perches and nest boxes for layers; deep litter must be kept dry and turned regularly.

Types of fencing: barbed wire (livestock boundary), stock-proof mesh (sheep and goats), electric fencing (predator and stock control), game fencing (tall wire mesh for wildlife) and chain-link (security and poultry runs).

Fence line selection: follow straight boundary lines where possible, avoid flood lines and erosion channels, allow for gate positions at access points, and use straining posts at corners and long spans.

A dipping tank is used to control external parasites such as ticks and mange mites; cattle should be dipped at intervals recommended by veterinary authorities, and the dip wash must be maintained at the correct concentration.

Building materials in Botswana include burnt brick, cement blocks, corrugated iron sheets, thatch and timber; local materials reduce cost but must be treated against termites and weather.

Plant pests are classified as insects (aphids, stalk borer, armyworm), mites, nematodes, molluscs (snails), birds and rodents; diseases are caused by fungi, bacteria, viruses and nutrient deficiencies.

Signs of plant disease include leaf spots, wilting, yellowing (chlorosis), stunting, galls, rot and mosaic patterns; diagnosis requires examining symptoms, the plant parts affected and environmental conditions.

Integrated pest management (IPM) combines cultural, biological, mechanical and chemical methods, using chemicals only when pest populations exceed economic thresholds.

Cattle diseases of importance in Botswana include foot-and-mouth disease (FMD), contagious bovine pleuropneumonia, anthrax, botulism, lumpy skin disease and brucellosis; FMD is controlled by vaccination and movement restrictions.

External parasites of livestock include ticks (which transmit heartwater, anaplasmosis and babesiosis), mites, lice and flies; internal parasites include roundworms (Haemonchus, Ostertagia), tapeworms and liver flukes.

Poultry diseases include Newcastle disease, fowl pox, infectious bronchitis, coccidiosis and fowl typhoid; Newcastle disease is controlled by vaccination of chicks at recommended intervals.

Withdrawal periods must be observed when using veterinary drugs on food-producing animals; milk and meat must not be sold until the drug residue has cleared the animal's system.

Notifiable diseases must be reported immediately to the Department of Veterinary Services; farmers must not move animals showing signs of FMD, anthrax or other notifiable diseases.

Factors of production in agriculture: land, labour, capital and entrepreneurship (management); each has a cost, and profit = total revenue minus total cost.

Gross margin = gross output (revenue) minus variable costs; it measures the contribution of an enterprise to fixed costs and profit and is used to compare enterprises.

Farm records include physical records (livestock numbers, crop yields, input quantities) and financial records (cash book, ledger, inventory, balance sheet); records support planning, credit applications and tax compliance.

Marketing functions: assembling, grading, storage, transport, processing, packaging and selling; a marketing channel is the route a product takes from producer to consumer.

Botswana's beef exports are channelled through the Botswana Meat Commission (BMC), which operates export abattoirs at Lobatse and Francistown and enforces veterinary and quality standards.

Price is determined by supply and demand; factors affecting agricultural prices include seasonality, quality grade, transport cost, competition and government policy or subsidies.

Depreciation is the loss in value of a fixed asset such as a tractor or building over time; straight-line depreciation = (cost − salvage value) ÷ useful life in years.

Break-even point is the level of output at which total revenue equals total cost; it is calculated as fixed costs ÷ (selling price per unit − variable cost per unit).

Agricultural extension is the process of transferring knowledge, skills and technology from research to farmers through advice, demonstrations, field days and training.

Extension methods are individual (farm visits, office consultations), group (demonstrations, field days, meetings, farmer field schools) and mass (radio, television, leaflets, posters, mobile phone messages).

The extension worker's roles include advising farmers, diagnosing problems, arranging training, linking farmers to markets and credit, and feeding farmers' problems back to researchers.

A cooperative is a voluntary association of people who jointly own and democratically control an enterprise to meet common economic and social needs.

Cooperative principles include voluntary and open membership, democratic control (one member, one vote), member economic participation, autonomy and independence, education and concern for the community.

Botswana cooperative structures are registered under cooperative legislation and operate through a general meeting, a committee and paid management; they provide input supply, marketing and savings services.

Rural development aims to improve rural incomes, infrastructure, education, health and employment; agriculture is a key driver through linkages with agro-processing, transport and services.

Adoption of new technology depends on its profitability, compatibility with existing practice, simplicity, trialability and observability, and on farmers' access to credit, inputs and markets.

Sustainable agriculture meets present needs without compromising the ability of future generations to meet theirs; it balances productivity, environmental protection and social equity.

Natural resources in agriculture include soil, water, vegetation, wildlife, air and biodiversity; sustainable management aims to prevent degradation and maintain productive capacity.

Soil conservation practices: contour ploughing, terracing, grass strips, mulching, crop rotation, cover cropping, controlled grazing and windbreaks (shelterbelts).

Water conservation practices: rainwater harvesting (roof catchment, micro-catchments), mulching to reduce evaporation, drip irrigation, water-efficient crop choice and maintenance of dams and boreholes.

Overgrazing is a major cause of land degradation in Botswana; it leads to loss of grass cover, soil compaction, erosion and bush encroachment (especially by Acacia and Dichrostachys species).

Bush encroachment control methods include controlled burning, mechanical clearing, chemical treatment (arboricides) and intensive browsing by goats; clearing increases grass production for cattle.

Integrated natural resource management in Botswana includes community-based natural resource management (CBNRM), wildlife management areas, controlled hunting and rangeland monitoring.

Climate-smart agriculture practices include drought-tolerant crop varieties, conservation agriculture (minimum tillage, mulch cover, rotation), water harvesting and improved livestock breeds and feeding.

A practical agriculture project should have clear objectives, a plan of activities, a budget, a time schedule, a record-keeping system and an evaluation of results.

Practical skills assessed in school agriculture include land preparation, planting, fertiliser application, weeding, pruning, harvesting, livestock feeding and handling, and tool maintenance.

Plot layout and record keeping: measure and mark plots accurately, label treatments clearly, record dates of operations, input quantities, costs and yields for each plot.

A school garden or plot should be sited near a water source, on level ground, with fertile, well-drained soil, and protected from livestock damage by fencing.

Project records should include a diary of operations, input and output records, a simple cash book and a final report comparing planned and actual results.

Safety in practical work: wear protective clothing (boots, gloves, overalls, hat), handle tools and chemicals correctly, wash hands after handling chemicals, and store pesticides in locked cabinets.

Evaluation of a project compares actual yields and income with the targets set at planning; it identifies strengths, weaknesses and recommendations for future projects.

Practical assessment often includes a demonstration of a skill (e.g. seedbed preparation, spraying, castration or dehorning) plus an oral explanation of the reasons for each step.