Green Gram (Ndengu) Farming in Kenya

A guide to growing green grams (ndengu) in Kenya's arid and semi-arid regions - covering drought-tolerant varieties, minimal input farming and market opportunities.

Introduction

Green gram (Vigna radiata), known as Ndengu in Kenya, is a drought-tolerant legume grown in semi-arid areas of Eastern, Coast and Rift Valley Kenya. It is gaining popularity as a high-protein export crop with growing demand in Asian markets.

Why Grow Green Grams?

Highly drought tolerant - survives on 300-400mm rainfall
Short season: 60-75 days
High protein content (24%) - food security crop
Growing export market (India, Pakistan, Middle East)
Improves soil nitrogen
Low production costs

Recommended Varieties

N26 (KALRO) - Most popular, green seeds, 65 days
KS20 (KALRO) - High yielding, 70 days, larger seeds
Biashara - Export grade, large seeds, 75 days
Perkara - Early maturing, 60 days, drought tolerant

Ecological Requirements

Rainfall: 300-600mm (drought tolerant)
Temperature: 25-35C
Altitude: Below 1,500m
Soil: Sandy loam to loam, pH 6.0-7.0
Avoid: Waterlogged soils, cold highlands

Best Growing Areas

Machakos, Makueni, Kitui (Eastern)
Taita Taveta, Kwale (Coast)
Kajiado, Narok (Rift Valley)
Tharaka Nithi (Eastern)

Planting

Season: Short rains (October-November) best. Long rains (March-April) possible
Spacing: 40cm x 10cm or 30cm x 15cm
Seed rate: 8-12 kg/acre
Depth: 2-3cm
Inoculate with Rhizobium for better nodulation

Fertilization

Minimal fertilizer needed
Basal: DAP 25kg/acre (phosphorus only)
No nitrogen needed (legume)
Foliar micronutrients optional

Pest and Disease Management

Pests:

Pod Borer (Maruca) - Most damaging pest. Larvae bore into pods and eat seeds. Treatment: Spinosad, Emamectin benzoate. Spray at 50% flowering
Aphids - Transmit viruses. Treatment: Imidacloprid

Diseases:

Powdery Mildew - White powder on leaves. Treatment: Sulphur, Myclobutanil
Cercospora Leaf Spot - Brown spots. Treatment: Mancozeb

Harvesting

Harvest when 70-80% of pods are black/dry
Harvest in 2-3 picks (pods mature unevenly)
Or harvest entire plant at once (faster but lower yield)
Thresh by beating on tarp
Dry to 12% moisture
Yield: 300-600kg/acre (rainfed), 600-1,000kg/acre (irrigated)

Marketing

Local market: KSh 80-120/kg
Export grade: KSh 100-150/kg
Export buyers in Nairobi: Bidco, Export Trading Group
East Africa: Uganda, Tanzania
International: India, Pakistan (high demand)

Profitability (1 acre)

Seed + fertilizer: KSh 8,000-12,000
Labour: KSh 5,000-8,000
Total cost: KSh 13,000-20,000
Yield: 300-500kg
Revenue at KSh 100/kg: KSh 30,000-50,000
Net profit: KSh 10,000-37,000
Low investment, reliable returns in dry areas