Mada za sehemu hiiDevelop an understanding of some advanced principles and practices of agricultureMada 1
- Describe the principles and practices for the production of selected crops (mushroom, clove, avocado, tea, coffee and cashew)
Principles and Practices for the Production of Selected Crops
This topic covers the production principles and practices for six important crops in Tanzania: mushroom, clove, avocado, tea, coffee, and cashew. Understanding these principles enables farmers to establish and manage these crops profitably while meeting market demands.
1.1 Importance and Characteristics
Mushrooms are fungi belonging to the kingdom Fungi. They are edible and nutritious, rich in proteins, vitamins, and minerals. In Tanzania, oyster mushrooms are the most commonly produced variety because they are easy to grow using locally available materials like crop residues.
1.2 Principles and Practices
Planning and Site Selection:
- The location should be easily accessible, with good ventilation to prevent mould and humidity problems
- Temperature should be maintained between 14°C and 25°C
- Relative humidity should be between 85% and 95%
- The area should be close to power sources and refrigeration facilities
Spawn Selection and Preparation:
- Spawn is the planting material for growing mushrooms, consisting of mushroom mycelia on a carrier material (usually sorghum, bulrush millet, or wheat)
- Spawn should be 15-20 days old for planting
- Healthy spawn should show signs of mycelium growth and be free from stickiness or foul smell
Substrate Preparation:
- Clean, sterilized straws, sawdust, coffee grounds, coconut coir, cardboard, or unbleached paper are viable options
- Substrate sterilization involves boiling for at least 2 hours
- Nitrogen supplements like gypsum can be added during composting
Inoculation:
- Add spawn to substrate at a ratio of 2-3% by weight (20-30g per 1kg substrate)
- Place spawn between each layer of substrate in polythene bags
- Store in a warm, dark room for incubation
Management Practices:
- Light and CO₂ Management: Mushrooms grow in dark rooms with high CO₂ levels initially. When mycelium appears, add fresh air to lower CO₂ for pin formation. Maintain CO₂ between 800-1200 ppm during pinning stage.
- Temperature and Humidity: Maintain air temperature between 14-25°C. Mist or spray water 2-3 times weekly to maintain humidity.
- Pest and Disease Management: Common pests include sciarid flies, mites, slugs, and nematodes. Common disease is green mould. Prevention through sanitation is crucial.
Harvesting:
- Harvest just before the veil breaks, typically 5-12 days after pins appear
- Harvest when mushrooms are dry on top
- Gently pull or twist mushrooms from substrate, or cut at base using clean scissors
Postharvest Management:
- Cover with plastic film and cool rapidly for market
- Store at 8-10°C in perforated polythene bags
- For preservation: drying (12-13% moisture), brine preservation, or canning
2.1 Importance and Characteristics
Clove (Syzygium aromaticum) is a perennial evergreen tree belonging to the Myrtaceae family. The dried flower buds are the main product. Tanzania is a major producer, mainly in Zanzibar, Tanga, and Morogoro regions.
2.2 Principles and Practices
Ecological Requirements:
- Humid tropical climate with annual rainfall of 1,500-2,500 mm
- Mean temperature of 20-32°C
- Elevation up to 1,000 m above sea level
- Well-drained, deep-rich loam soils with high humus content
Variety Selection:
- Main varieties: Zanzibar clove and Madagascar clove
- Select varieties based on advice from agricultural experts
Nursery Practices:
- Sow seeds in beds 15-20 cm height, 1 m width
- Seeds sown at 2-3 cm spacing, 2 cm depth
- Germination occurs in 10-15 days
- Transplant seedlings to polythene bags (30 cm × 15 cm) with soil mixture (3:3:1 soil:sand:well-decomposed manure)
- Seedlings ready for transplanting at 18-24 months old
Field Establishment:
- Spacing: 6 × 6 m (278 trees per hectare)
- Hole size: 60 × 60 × 60 cm
- Transplant seedlings at 18 months old or 30-50 cm height
- Provide temporary shading through intercropping with banana, cassava, or coconut
Water and Nutrient Management:
- Require frequent watering during first 3-4 years
- Avoid waterlogging
- Apply organic or inorganic fertilizers based on soil test results
- Major nutrients: N, P, K, Ca, Mg, S and micronutrients (Zn, Cu, B)
Pest and Disease Management:
- Pests: Clove stem borer, coconut scale, fruit fly, soft scale, nematodes
- Diseases: Sudden-death disease, dieback (Eucalyptus canker), Sumatra disease, leaf rot
Harvesting:
- Main product is flower bud
- Trees begin producing at 4-6 years after transplanting
- Maturity indicated by colour change from green to pink
- Pick buds with length 1-2 cm
- Harvest over 3-8 pickings during season
Postharvest Management:
- Separate buds from clusters
- Dry in full sun until buds turn brown (4-5 days)
- Moisture content should be 13%
- Grade into Special, First, Second, and Third grades
- Store in cool environment (15-21°C) with humidity 50-60%
3.1 Importance and Characteristics
Avocado (Persea americana) is a medium to large evergreen tree belonging to the Lauraceae family. It is nutritionally important, rich in fats, proteins, vitamins, and minerals. Major producing regions in Tanzania include Arusha, Kilimanjaro, Mbeya, Songwe, and Njombe.
3.2 Principles and Practices
Ecological Requirements:
- Altitude: 800-2,500 m above sea level
- Temperature: 10-30°C
- Annual rainfall: 1,000-2,000 mm
- Soil: Deep, well-drained fertile sandy or alluvial loam with pH 5-6.5
Variety Selection:
- Main commercial varieties: Hass and Fuerte
- Types: Guatemalan, West Indian, and Mexican races
- Consider Type A and Type B flower characteristics for pollination
Nursery Practices:
- Collect seeds from reliable sources
- Prepare growing media (soil:sand:manure = 2:2:1)
- Sow seeds with broader end at bottom
- Grafting preferred for commercial production (takes 3 years to fruit versus 7+ years from seed)
- Grafting height: 30-45 cm from root collar
Field Establishment:
- Spacing: Hass (7 m × 7 m), Fuerte (9 m × 9 m), Pinkerton (6 m × 6 m)
- Hole size: 60 × 60 × 60 cm
- Mix topsoil with phosphatic fertilizers and organic manure
Water Management:
- Young trees: 6-11 mm per week
- Mature trees: 15-30 mm per week
- Irrigation at 20-40 litres per tree per week in two splits
- Use drip or micro sprinkler irrigation
Nutrient Management:
- Important nutrients: N, P, K, Ca, Mg, S, Fe, Zn, Mn, B, Cu, Mo
- Conduct soil tests for proper fertilizer application
Pest and Disease Management:
- Pests: Fruit flies, avocado thrips, false codling moth, mealybugs, avocado mites
- Diseases: Phytophthora root rot, anthracnose, algae leaf spot, scab, bacterial soft rot, stem end rot
Harvesting:
- Begin producing at 3-5 years after transplanting
- Maturity indices: colour change (green to black/purple for Hass), minimum 11.2% oil content or 23% dry matter
- Use secateurs to clip stalk, leaving portion attached
- Handle gently to avoid bruising
Postharvest Management:
- Pre-cool to 16°C or colder within 2 hours of harvest
- Sort, grade (Extra Class, Class I, Class II), and package
- Store at 6-7°C for Hass and Fuerte varieties
- Transport in refrigerated containers
4.1 Importance and Characteristics
Tea (Camellia sinensis) is an evergreen shrub cultivated for its leaves. It is one of Tanzania's largest export crops, primarily grown in the Southern Highlands (Mufindi, Njombe, Tukuyu), East Usambara, and Kagera region.
4.2 Principles and Practices
Ecological Requirements:
- Altitude: 800-2,500 m above sea level
- Temperature: 12-30°C
- Rainfall: 2,500-3,000 mm per year
- Soil: Deep, fertile, well-drained, rich in humus, pH 4.0-5.5
Variety Selection:
- Recommended clones from Tea Research Institute of Tanzania (TRIT): TRFK 301/5, TRFK 303/178, TRFK 430/63, TRFK 381/5
Nursery Practices:
- Propagate using stem cuttings (vegetative propagation preferred)
- Use semi-woody mature branches with axillary buds
- Apply rooting hormones (NAA, IBA) for faster rooting
- Rooting takes 3-4 months
- Seedlings ready after about one year
Field Establishment:
- Spacing: 105 cm between rows, 75 cm within row (~12,698 plants/ha)
- Hole size: 30 × 30 × 30 cm
- Apply 15 g DAP or TSP per hole
Water Management:
- Use drip or sprinkler irrigation
- Yields decrease with less frequent irrigation
- Excessive moisture can cause diseases
Nutrient Management:
- Combine organic and inorganic fertilizers
- Major nutrients: N, P, K
- Excessive nitrogen affects leaf quality (becomes bitter)
Pest and Disease Management:
- Pests: Tea mosquito bug, yellow tea thrip, tea green leafhopper, tea aphid, tea bunch caterpillar, tea red spider mite, tea looper, Black Inch Worm, tea borer, termites
- Diseases: Armillaria root rot, algal leaf spot, brown blight, blister blight
Harvesting (Plucking):
- First harvest at 3-4 years after transplanting
- Plucking interval: 1-2 weeks
- Methods: bud alone, bud plus 1-2 leaves, bud plus 3 leaves, bud plus more than 3 leaves
- Deliver to factory within 24 hours
Processing:
- Orthodox method: withering → rolling → oxidation (fermentation) → drying
- Green tea: steaming → rolling → drying
- Oolong tea: partially fermented
Grading:
- Whole leaf grades: OP, FOP, GFOP, TGFOP, FTGFOP
- Broken leaf grades: BOP, FBOP, GFBOP, TGBOP
- Fannings and Dust: BOPF, PF, D
- CTC grades: BP1, PF1, PD, D1
5.1 Importance and Characteristics
Coffee is a woody evergreen plant belonging to the Rubiaceae family. Two main types: Arabica (Coffea arabica) and Robusta (Coffea canephora). In Tanzania, Arabica is grown in highland regions while Robusta is grown in lower areas like Kagera, Morogoro, and Mwanza.
5.2 Principles and Practices
Ecological Requirements:
- Arabica: Altitude 900-2,000 m, temperature 15-21.1°C
- Robusta: Altitude below 900 m, temperature 20-30°C
- Rainfall: 1,000-2,000 mm per year
- Soil: Fertile volcanic red soil or deep sandy loam, pH 4.9-5.6
- Requires shade during early growth
Variety Selection:
- Arabica: Bourbon, Kent, Typica, N39, Blue Mountain, Nyassa
- Robusta: Maruku 1, Maruku 2, Bukoba 1, Muleba 1
Propagation:
- Seed propagation: Select healthy berries, test viability by floating in water, remove pulp, sow in polythene bags
- Stem cuttings: Use 15 cm stems with rooting hormone, maintain 80-90% relative humidity
- Seedlings ready at 5-6 months (seedlings) or 3-4 months (rooted cuttings)
Field Establishment:
- Arabica spacing: 2 × 2 m (monocropping), 2 × 3 m or 2 × 5 m (intercropping)
- Robusta spacing: 2 × 3 m (monocropping), 3 × 3 m (intercropping)
- Hole size: 60 × 60 × 60 cm
- Apply 2-5 kg compost per hole
- Transplant at start of rainy season
Water Management:
- Methods: furrow, sprinkler, drip irrigation
- Young plants (<6 months): 2 litres per day
- Mature plants (5 years): up to 7 litres per day
Nutrient Management:
- Major nutrients: N (vegetative growth), P (root development, flowering), K (berry development, ripening)
- Micronutrients: Zn, Cu, Mg, Ca, B, Fe, Mn, Mo, S, Cl
Pest and Disease Management:
- Pests: Coffee leaf miner, coffee stem borer, coffee berry borer, coffee mealybugs
- Diseases: Coffee leaf rust, coffee berry disease, coffee red blister disease
Harvesting:
- Begins bearing at 24 months (cuttings) or 36-48 months (seeds)
- Maturity: berries change from green → yellow → deep red
- Methods: selective picking (hand) or strip picking
- Process within 24 hours of harvesting
Processing Methods:
- Wet method: Pulping → fermentation → washing → drying → peeling → green beans (mainly Arabica)
- Dry method: Drying → hulling → green beans (mainly Robusta)
Grading (Tanzania):
- Arabica: AA, A, B, PB, C, E, F, AF, TT, UG
- Robusta: Screen 18, 15/16, 12, 10 and below, FAQ, MC, Bulk
6.1 Importance and Characteristics
Cashew (Anacardium occidentale) belongs to the Anacardiaceae family. The main products are the cashew apple (fruit) and cashew nut (kernel). Tanzania's main producing regions include Mtwara, Lindi, Pwani, Ruvuma, and Tanga.
6.2 Principles and Practices
Ecological Requirements:
- Tropical humid climate with wet and dry seasons
- Rainfall: 1,000-2,000 mm per year
- Altitude: 0-1,000 m above sea level
- Temperature: 20-30°C
- Soil: Light-textured, fertile, well-drained sandy loam, pH 5.5-7.0
Variety Selection:
- Clones: AC4, AC34, AZA2
- Hybrids: H1, H2, ... H33
- Dwarf cashews: TDC1, TDC2, ... TDC24
Propagation Methods:
- Direct seeding: Normal, clonal, or polyclonal seeds
- Vegetative: Cuttings, air layering, grafting, budding, tissue culture
- Grafting preferred for true-to-type, uniform, early-maturing trees
Nursery Practices:
- Select medium-sized seed nuts (6-7 g)
- Sun-dry for 2-3 days
- Soak in water for 12-24 hours before sowing
- Sow to 2-3 cm depth in polythene bags (25 × 15 cm)
- Germination in 10-15 days
- Graft when seedlings are 50-60 days old
Field Establishment:
- Spacing: 7.5 × 7.5 m (175 plants/ha) or 8 × 8 m (156 plants/ha)
- Hole size: 60 × 60 × 60 cm
- Apply 15-20 kg compost, 300 g rock phosphate, 100 g anti-termite per hole
- Plant at start of rainfall season
Water Management:
- Generally rain-fed but supplemental irrigation can double yields
- Critical periods: after transplanting, flowering, and fruit development
- Drip irrigation: 20 litres/tree/day
Nutrient Management:
- Major nutrients: N (most important), K (second), P (smaller quantities)
- Apply in circular ring within 2.5 m radius from trunk
- Depth: 5-7 cm, cover with green leaves and soil
- Micronutrients applied through foliar sprays
**P
Swali
What is the recommended age of mushroom spawn for planting?
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