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Kenaf

Crop details

Kenaf

Hibiscus cannabinus
Family: Malvaceae

Quick stats

Family Malvaceae
Typical harvest 9.0 t/ha
Varieties 3
Pests & diseases 5
Seasons 6

Crop profile

Growth habit annual
Days to harvest 100–150
Main uses Bast fiber (stem bark); paper/pulp; textiles; seed oil; fodder (leaf/stover)
Pollination self
Origin / where it grows Old World tropics; cultivated in humid/sub-humid warm regions incl. East Africa

Weather, soil & spacing

Best temperature 24–32 °C
Rainfall 600–1200 mm/yr
Altitude 0–1600 m
Best pH 6–7.2
Soil type Well-drained loam/sandy loam; fertile; good organic matter
Row spacing 40 cm
Plant spacing 20 cm
Planting depth 2 cm
Seed rate 20 kg/ha
Nursery days

Simple notes for farmers

About the crop: This crop is annual. You plant, grow and harvest it in one main season, then plant again. You can normally start harvesting about 100–150 days after planting, depending on care and variety.

Main use: Farmers mostly grow this crop for bast fiber (stem bark); paper/pulp; textiles; seed oil; fodder (leaf/stover).

Pollination: This crop is mainly pollinated by self. Keeping flowers healthy and having insects like bees in the field helps improve fruit set and yields.

Where it grows: Old World tropics; cultivated in humid/sub-humid warm regions incl. East Africa It is grouped under: Oil & Industrial.

Best climate: This crop does well in warm areas where the temperature is usually between 24 and 32 degrees Celsius. It prefers places that receive around 600 to 1200 millimetres of rain in a year. It can grow from near sea level up to about 1600 metres above sea level.

Soil: The crop grows best in slightly acidic to near neutral soils, with a pH of about 6 to 7.2. It does well in well-drained loam/sandy loam; fertile; good organic matter. Good drainage is important, so avoid waterlogged spots.

Plant spacing: Plant in rows about 40 centimetres apart, and leave about 20 centimetres between plants in the row. This gives each plant enough space for roots and canopy to spread.

Planting depth: Dig planting holes or furrows about 2 centimetres deep so the roots sit firmly in the soil but are not buried too deep.

Seed or planting material: Use around 20 kilograms of seed or planting material per hectare. Spread or plant evenly so the field has a good stand without being overcrowded.

Farmer guide (mwongozo wa mkulima)

Planting: Direct-seed on a fine, firm seedbed at onset of rains. Thin to spacing at 2–3 weeks. Keep weed-free during early growth.
Transplanting: Not commonly transplanted; direct seeding preferred.
Irrigation: Maintain adequate moisture during first 6–8 weeks and at rapid stem elongation.
Fertigation: If irrigated, split N and K into small doses; avoid excess late N to reduce lodging.
Pest scouting: Scout for defoliators, whiteflies/aphids (virus risk), and stem rots; remove diseased plants.
Pruning: Not required; avoid lodging via balanced nutrition and density.
Harvest: Harvest for fiber at early pod set when stems are mature but not woody; rett stems and strip bast fiber.
Postharvest: Ret evenly (water or dew); wash and dry fiber under shade; store dry and aerated.

Nutrient schedule (mbolea kwa hatua)

# Stage DAP Product Rate Targets (kg/ha) Notes
1 Basal 0 NPK 17-17-17 100 kg/ha N: —, P₂O₅: —, K₂O: — Band or broadcast and incorporate
2 Topdress 1 30 Urea or CAN 60 kg/ha N: —, P₂O₅: —, K₂O: — Apply on moist soil; avoid leaf contact
3 Topdress 2 (optional) 50 Urea (light) 30 kg/ha N: —, P₂O₅: —, K₂O: — Only if crop vigor is low

Nutrient requirements

Nutrient Stage Amount Unit
N Basal 40 kg/ha
P₂O₅ Basal 30 kg/ha
K₂O Basal 40 kg/ha
N Topdress 40 kg/ha
K₂O Topdress 20 kg/ha
N Late 20 kg/ha

Field images (picha shambani)

Kenaf
Name Country Maturity Traits
Local Kenaf KE 150 Fiber yield
Local fiber type KE 120 Tall; good bast yield
Dual-purpose (fiber/biomass) TZ 110 Moderate height; good biomass
Stage Product Rate (kg/ha) Notes
Basal NPK 15-15-15 80
Basal NPK 17-17-17 100 At sowing
Topdress Urea 46% N or CAN 26% N 60 ~30 DAP
Topdress Urea (optional) 30 ~50 DAP if needed
Name Type Symptoms Management
Stem borers pest Bored stems Rotation; timely harvest
Hairy caterpillar/defoliators pest Leaf stripping; skeletonization Early scouting; hand-pick or targeted sprays; conserve natural enemies
Aphids & whiteflies pest Honeydew/sooty mold; virus transmission Monitor; control ants; selective insecticides if thresholds exceeded
Stem/foot rot (Fusarium/Pythium) disease Stem base rot; wilting Rotation; well-drained fields; avoid injury; rogue plants
Leaf spots (Cercospora/Alternaria) disease Spots; premature defoliation Spacing; sanitation; protectants if severe
System Typical Min Max Notes
rainfed 10 6 15 Stem biomass (fresh)
rainfed smallholder 2 1.2 3 Bast fiber
biomass (stems, fresh) 15 10 25 Whole stem fresh biomass
Country Region Planting Harvest
KE Humid lowlands Mar–Apr Jul–Oct
KE Low to mid-altitudes (long rains) Mar–Apr Jul–Sep
KE Low to mid-altitudes (short rains) Oct–Nov Feb–Mar
UG Eastern/Central (1st rains) Mar–Apr Jul–Aug
UG Eastern/Central (2nd rains) Aug–Sep Dec–Jan
TZ Northern unimodal Nov–Dec Mar–May
Country Region Suitability
KE Coastal; Lower Eastern; Lake Basin; mid-altitude warm zones High
KE Cool highlands >1800 m Low
KE Humid lowlands High
KE Poorly drained wetlands Low
TZ Coast; Morogoro; warm valleys High
UG Eastern & Central warm sub-humid High