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Sudan grass

Crop details

Sudan grass

Sorghum × drummondii (sudangrass)
Family: Poaceae

Quick stats

Family Poaceae
Typical harvest 26.7 t/ha
Varieties 2
Pests & diseases 7
Seasons 3

Crop profile

Growth habit annual
Days to harvest 60–110
Main uses Forage (grazing, green chop, hay); cover crop; silage
Pollination wind
Origin / where it grows Warm-season grass; grown in tropics/subtropics and warm temperate zones

Weather, soil & spacing

Best temperature 24–34 °C
Rainfall 450–800 mm/yr
Altitude 0–1800 m
Best pH 6–7.2
Soil type Well-drained loam/sandy loam; tolerates light soils
Row spacing 30 cm
Plant spacing 10 cm
Planting depth 2.5 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 60–110 days after planting, depending on care and variety.

Main use: Farmers mostly grow this crop for forage (grazing, green chop, hay); cover crop; silage.

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

Where it grows: Warm-season grass; grown in tropics/subtropics and warm temperate zones It is grouped under: Forages & Fodder.

Best climate: This crop does well in warm areas where the temperature is usually between 24 and 34 degrees Celsius. It prefers places that receive around 450 to 800 millimetres of rain in a year. It can grow from near sea level up to about 1800 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; tolerates light soils. Good drainage is important, so avoid waterlogged spots.

Plant spacing: Plant in rows about 30 centimetres apart, and leave about 10 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 2.5 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: Sow into warm, moist seedbed after onset of rains or with irrigation; roll/firm for good contact.
Transplanting: Not transplanted.
Irrigation: Drought-tolerant but highest yields with timely moisture; avoid saturation.
Fertigation: Grasses respond to N; split N 2–3 times; ensure K and S for regrowth.
Pest scouting: Scout early for shoot fly/armyworms and leaf diseases; manage weeds aggressively in first 4–6 weeks.
Pruning: Not applicable; manage by cutting height and intervals.
Harvest: First cut at 45–60 DAS (50–70 cm height) or early boot; leave 10–15 cm stubble for regrowth.
Postharvest: For hay, wilt rapidly to safe moisture; for silage, chop at 30–35% DM; avoid nitrate/prussic acid risks.

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: — Place below/aside seed to avoid burn
2 Tillering topdress 25 Urea 46% N or CAN 26% N 80 kg/ha N: 40, P₂O₅: —, K₂O: — Irrigate or apply before rain
3 After 1st cut 55 Urea 46% N + MOP (KCl) 80 kg/ha (urea) + 60 kg/ha MOP N: 40, P₂O₅: —, K₂O: 30 Broadcast evenly on moist soil

Nutrient requirements

Nutrient Stage Amount Unit
N Basal 40 kg/ha
P₂O₅ Basal 25 kg/ha
K₂O Basal 40 kg/ha
N Topdress 40 kg/ha
N Topdress1 40 kg/ha
P₂O₅ Topdress1 0 kg/ha
K₂O Topdress1 30 kg/ha
N After_cut 40 kg/ha
P₂O₅ After_cut 0 kg/ha
K₂O After_cut 30 kg/ha

Field images (picha shambani)

Sudan grass
Name Country Maturity Traits
Local Sudan grass KE 70 Rapid regrowth; multi-cut
Piper type TZ 75 Fine stems; good hay
Stage Product Rate (kg/ha) Notes
Basal NPK 17-17-17 100
Topdress Urea 46% N (or CAN) 80 Split after emergence and after cuts
After cut MOP (KCl) 60 Supports regrowth and stand persistence
Name Type Symptoms Management
Sorghum midge pest Poor seed set Early planting; tolerant types
Armyworms/cutworms pest Defoliation; stand loss Early scouting; baits/controls if thresholds exceeded
Shoot fly pest Deadhearts in seedlings Timely sowing; seed treatment; replant gaps
Stem borers pest Tunneling; broken stems Stubble management; rotations; biological controls
Leaf spot/rust disease Spots/pustules on leaves Resistant lines; airflow; timely protectants if severe
Smut/ergot (sorghum) disease Black sori; sticky exudate Clean seed; crop hygiene; rotation
Sorghum midge (in seed) pest Poor grain in seed production Synchronize flowering; avoid volunteer hosts
System Typical Min Max Notes
cut-and-carry 30 15 50 Fresh biomass
rainfed forage 15 8 25 Fresh biomass per cut; 2–3 cuts possible (site-dependent)
irrigated forage 35 20 60 Cumulative fresh biomass across multiple cuts
Country Region Planting Harvest
KE Lowlands & mid-altitudes (long rains) Mar–Apr May–Sep
KE Lowlands & mid-altitudes (short rains) Oct–Nov Dec–Apr
TZ Central semi-arid (with showers/irrig.) Dec–Jan Feb–Jun
Country Region Suitability
KE Cool highlands (>2000 m) Low
KE Lowlands & mid-altitudes High
KE Lowlands/Semi-arid High
TZ Central semi-arid (irrigated) High
UG Dry savanna Medium