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Sword bean (Canavalia ensiformis)

Crop details

Sword bean (Canavalia ensiformis)

Canavalia ensiformis
Family: Fabaceae

Quick stats

Family Fabaceae
Typical harvest 5.7 t/ha
Varieties 1
Pests & diseases 5
Seasons 1

Crop profile

Growth habit climber
Days to harvest 120-180
Main uses Green manure; pulse
Pollination insect
Origin / where it grows Tropics

Weather, soil & spacing

Best temperature 22–30 °C
Rainfall 900–1500 mm/yr
Altitude 0–1600 m
Best pH 5.5–6.8
Soil type Light to medium soils
Row spacing 100 cm
Plant spacing 50 cm
Planting depth 3 cm
Seed rate 25 kg/ha
Nursery days

Simple notes for farmers

About the crop: This crop has a growth habit described as "climber". You can normally start harvesting about 120-180 days after planting, depending on care and variety.

Main use: Farmers mostly grow this crop for green manure; pulse.

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

Where it grows: Tropics It is grouped under: Legumes & Pulses.

Best climate: This crop does well in warm areas where the temperature is usually between 22 and 30 degrees Celsius. It prefers places that receive around 900 to 1500 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 5.5 to 6.8. It does well in light to medium soils. Good drainage is important, so avoid waterlogged spots.

Plant spacing: Plant in rows about 100 centimetres apart, and leave about 50 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 3 centimetres deep so the roots sit firmly in the soil but are not buried too deep.

Seed or planting material: Use around 25 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 at onset of rains; provide trellis or allow to sprawl as green manure.
Transplanting: Not transplanted.
Irrigation: Rainfed in humid zones; irrigate during dry spells to support flowering/pod set.
Fertigation: Minimal N (fixing legume); ensure P and K; add S/Ca if deficient.
Pest scouting: Scout for pod borers and beetles; maintain sanitation and timely picking.
Pruning: Train vines on supports where seed yield is the goal.
Harvest: For green manure, incorporate at flowering; for grain, harvest when pods brown and seeds hard.
Postharvest: Dry seed to ≤12% moisture; store cool/dry; cook/process thoroughly before food use.

Nutrient schedule (mbolea kwa hatua)

# Stage DAP Product Rate Targets (kg/ha) Notes
1 Basal 0 NPK 15-15-15 50 kg/ha N: —, P₂O₅: —, K₂O: — Or DAP+MOP equivalent; keep away from seed inoculant
2 Early pod set (opt.) 40 Sulfate of potash (SOP) 40 kg/ha N: —, P₂O₅: —, K₂O: 20 Skip if soil K is adequate

Nutrient requirements

Nutrient Stage Amount Unit
N Basal 0 kg/ha
P₂O₅ Basal 20 kg/ha
K₂O Basal 20 kg/ha
N Topdress 0 kg/ha
P₂O₅ Topdress 0 kg/ha
K₂O Topdress 20 kg/ha

Field images (picha shambani)

Sword bean (Canavalia ensiformis)
Name Country Maturity Traits
Local Canavalia KE 150 Vigorous
Stage Product Rate (kg/ha) Notes
Basal NPK 15-15-15 50 Or banded P+K sources
Pod set Sulfate of potash (SOP) 40 Apply only if K is low
Name Type Symptoms Management
Pod borers pest Pod damage Frequent picking; sanitation
Pod borers (Helicoverpa/Maruca) pest Bored pods; seed damage Flower–pod scouting; threshold sprays; timely harvest
Leaf beetles pest Defoliation; shot-holes Early control if severe; conserve natural enemies
Aphids pest Leaf curl; honeydew/sooty mold Control ants; soft insecticides; encourage predators
Root rots (Rhizoctonia/Pythium) disease Damping-off; root lesions Well-drained fields; seed treatment; avoid overwatering
System Typical Min Max Notes
green manure 8 4 12 Biomass (DM)
green manure (biomass DM) 8 4 12 Dry matter biomass
rainfed seed 1 0.6 1.8 Clean seed under good management
Country Region Planting Harvest
KE Humid lowlands Mar–Apr Jul–Nov
Country Region Suitability
KE Humid lowlands High
TZ Coastal belt High
UG Lake Victoria basin Medium