Lesson Notes By Weeks and Term v5 - Grade 11

Lesson Video

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Performance objectives

• Explain soil preparation for different soil types.
• Identify common South African pasture and fodder crops.
• Calculate seeding and fertilizer application rates.
• Compare methods for harvesting and storing fodder.
• Explain sustainable grazing management practices.

Lesson summary

Pasture and fodder production are vital components of livestock farming in South Africa. The availability of quality feed directly impacts livestock health, growth, and productivity, which subsequently affects the income and livelihood of farmers and food security in the nation. Managing pastures and producing fodder effectively are crucial skills for any aspiring agriculturalist. In South Africa, where droughts and unpredictable rainfall patterns are common, understanding these practices is particularly important to ensure sustainable livestock farming.

Lesson notes

2.1 Soil Preparation and Seedbed Establishment: Importance: A well-prepared seedbed is crucial for successful germination and seedling establishment. It provides the necessary conditions for seed-soil contact, moisture retention, and drainage.

Sandy Soils: Sandy soils are well-drained but have low water-holding capacity and nutrient content. Preparing sandy soils involves incorporating organic matter (e.g., compost, manure) to improve water retention and nutrient availability. Ploughing or discing should be done when the soil is moist but not waterlogged to prevent compaction. Rolling the soil after seeding can improve seed-soil contact.

Clay Soils: Clay soils have high water-holding capacity and nutrient content but can be poorly drained and prone to compaction. Preparing clay soils involves improving drainage and reducing compaction. This can be achieved through adding organic matter and incorporating gypsum or lime to improve soil structure. Ploughing or discing should be done when the soil is relatively dry to avoid creating clods. A fine, firm seedbed is essential.

Seedbed Preparation Techniques: Ploughing: Turns the soil over, burying crop residues and weeds.

Discing: Breaks up clods and levels the soil surface.

Harrowing: Creates a fine seedbed and incorporates fertilizers.

Rolling: Firms the seedbed and improves seed-soil contact.

South African Context: In many parts of South Africa, soil erosion is a significant problem. Minimum tillage practices (e.g., no-till planting) are increasingly promoted to conserve soil and water. 2.2 Common Pasture and Fodder Crops in South Africa: Kikuyu Grass (Pennisetum clandestinum): A popular perennial grass in coastal areas and regions with high rainfall. It is palatable, productive, and tolerant of grazing.

Smuts Finger Grass (Digitaria eriantha): A drought-tolerant perennial grass suitable for drier areas. It is relatively palatable and provides good ground cover.

Rhodes Grass (Chloris gayana): A quick-growing perennial grass adapted to a wide range of soil types. It is used for grazing and hay production.

Lucerne (Medicago sativa): A high-protein legume suitable for intensive livestock production. It requires well-drained soils and is sensitive to waterlogging.

Oats (Avena sativa): An annual cereal crop used for grazing or silage production. It is quick-growing and provides a good source of energy.

Teff (Eragrostis tef): An annual grass used for hay production. It is drought-tolerant and relatively easy to grow.

Selection Criteria: Selecting appropriate pasture and fodder crops depends on factors such as: Climate (rainfall, temperature) Soil type Livestock type and nutritional requirements Management practices 2.3 Calculating Seeding and Fertilization Rates: Seeding Rate: The amount of seed required per unit area (e.g., kg/ha).

Factors Affecting Seeding Rate: Germination percentage, seed size, desired plant density, and soil conditions.

Formula: Desired plant density = (Seeding rate (kg/ha) Germination percentage * Seed purity) / (Seed weight per plant)

Example: A farmer wants to plant Smuts Finger grass. The recommended plant density is 200 plants/m². Seed germination is 80%, seed purity is 95%, and the seed weight per plant is estimated to be 0.0001 kg. Calculate the required seeding rate.

Solution: Convert desired plant density to plants/ha: 200 plants/m² * 10000 m²/ha = 2,000,000 plants/ha Rearrange the formula to solve for seeding rate: Seeding rate (kg/ha) = (Desired plant density Seed weight per plant) / (Germination percentage Seed purity)

Substitute the values: Seeding rate (kg/ha) = (2,000,000 plants/ha 0.0001 kg/plant) / (0.80 0.95)

Calculate the seeding rate: Seeding rate (kg/ha) = 200 / 0.76 = 263.16 kg/ha Fertilization Rate: The amount of fertilizer required per unit area (e.g., kg/ha).

Factors Affecting Fertilization Rate: Soil nutrient levels, crop requirements, fertilizer type, and application method.

Soil Testing: Essential for determining the nutrient status of the soil.

Nutrient Requirements: Different crops have different nutrient requirements (N, P, K).

Fertilizer Grade: The percentage of nutrients in the fertilizer (e.g., 15-15-15 contains 15% N, 15% P2O5, and 15% K2O).

Example: A soil test indicates that a pasture is deficient in Nitrogen (N). The recommendation is to apply 50 kg N/ha. The farmer is using Ammonium Nitrate (34% N). Calculate the amount of Ammonium Nitrate needed per hectare.

Solution: Formula: Fertilizer amount (kg/ha) = (Recommended nutrient amount (kg/ha)) / (Nutrient content in fertilizer (%)) * 100 Fertilizer amount (kg/ha) = (50 kg N/ha) / (34%) * 100 Fertilizer amount (kg/ha) = 50 / 0.34 * 100 = 147.06 kg/ha of Ammonium Nitrate 2.4 Harvesting and Storage of Fodder: Hay: Dried forage (grasses, legumes) with a moisture content of 15-20%.

Harvesting: Cut at the appropriate stage of maturity, dried in the sun, and baled.

Storage: Store in a dry, well-ventilated area to prevent spoilage.