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Rajma (Kidney Bean)

राज्मा (Rajma)
📖 Phaseolus vulgaris L. L.
Cereals & Millets 📅 Falgun (फागुन) – Jestha (जेठ) 🌡️ 15–25°C ⚗️ pH 6.0–7.0 ⏱️ 80-110 days
Growing Season & Schedule
🌱
Recommended Growing Window: Falgun (फागुन) – Jestha (जेठ)
Land Preparation: Deeply plough the field 2-3 times to create a fine, weed-free tilth. Incorporate 10-15 metric tons of well-decomposed FYM or compost per hectare during final tillage.

Sowing: Sow seeds directly into moist soil at a depth of 3-5 cm. Space rows 30-40 cm apart with 10-15 cm spacing between plants. Maintain a seed rate of 75-90 kg/ha depending on seed size.

Watering & Care: Maintain optimal soil moisture during critical stages: germination, flowering, and pod development. Avoid waterlogging at all costs. Perform earthing-up and weeding at 20-25 days post-emergence. Pole-type varieties require staking with bamboo sticks for structural support.
Description & Overview
Rajma (Phaseolus vulgaris L.), commonly known as kidney bean, is an important grain legume cultivated across diverse agro-ecological zones in Nepal. Renowned for its rich nutritional profile, Rajma is a staple protein source in Nepalese households and plays a vital role in local cropping systems, particularly in mid-hill and high-hill regions like Jumla, Mustang, and Dolakha, as well as winter cultivation in the Terai.

In Nepal, famous organic geographical indications like 'Jumli Rajma' command premium market value due to their distinct taste, fast cooking quality, and high nutrient density. Improved varieties such as Trishuli Rajma, Pusa Parvati, and local landraces are grown for both fresh green pods and dry grain pulse production.
Details & Agronomic Insights
🌟 Positive Attributes & Health Benefits
Exceptional nutritional value packed with plant protein (20-25%), dietary fiber, complex carbohydrates, iron, magnesium, and folate. Highly lucrative cash crop for high-altitude organic farmers in Nepal with strong market demand. Helps fix atmospheric nitrogen and improves soil structure when integrated into crop rotations.
⚠️ Precautions & Adverse Notes
Highly sensitive to excess waterlogging, frost, and high temperatures above 30°C which causes flower drop. Less effective at native Rhizobium nodulation compared to other legumes, requiring initial nitrogen supplementation. Highly vulnerable to fungal pathogens like anthracnose and root rot under high humidity.
🐛 Major Diseases & Pests
Anthracnose (Colletotrichum lindemuthianum - dark sunken lesions on leaves, stems, and pods), Root Rot / Damping-off (Rhizoctonia/Fusarium - yellowing, wilting, stem browning near soil line), Bean Rust (Uromyces appendiculatus - reddish-brown pustules on underside of leaves), Aphids and Leaf Miners (sap sucking causing leaf curl and vectoring viruses).
💊 Disease & Pest Solutions
Organic/IPM: Practise 2-3 year crop rotation with non-legumes. Treat seeds with Trichoderma viride @ 6-10g/kg seed. Apply Jholmol-1 (1:5 dilution with water) or Neem Seed Kernel Extract (NSKE 5%) to control sucking pests like aphids.

Chemical: Seed treatment with Carbendazim @ 2g/kg seed before sowing. Spray Mancozeb @ 2.5g/L or Copper Oxychloride @ 3g/L of water at the first sign of fungal spots. Spray Imidacloprid (0.5 ml/L) for severe aphid infestation prior to flowering.
🧪 Fertilizer & Nutrition Recommendations
Basal Dose: Apply 10-12 tons/ha of FYM/compost, along with NPK @ 30:60:40 kg/ha during final land preparation (Rajma requires more basal N than other legumes due to poor nodulation).

Top-Dressing: Top-dress 20 kg N/ha (Urea) at 25-30 days after sowing alongside earthing up. Apply foliar sprays of diluted Jholmol-2 or 1% 19:19:19 NPK during pre-flowering stage for enhanced pod set.
Planting & Cultivation Guide
🌱 Planting Method Direct Seeding
📏 Seed Depth 4.0 cm
↔️ Seed Spacing 12.0 cm
📐 Row Spacing 35.0 cm
🪱 Soil Type Well-drained fertile sandy loam to silt loam
💧 Water Requirement Moderate (1-2 times weekly)
☀️ Sunlight Full sun
🧪 NPK Dose 100:60:40 NPK kg/ha
Climate & Altitude Requirements
⛰️ Altitude Range 300–2400 m
🗺️ Suitable Regions Terai (Winter), Mid-Hills, High-Hills (Summer/Spring)
🌡️ Temperature Range 15–25°C
⚗️ Optimal pH 6.0–7.0
Harvest Information & Yield
⏱️ Maturity Days 80-110 days
📦 Expected Yield 1.5-2.5 tons/ha (Dry Grain)
🔍 Harvest Indicators:

Pods change color from green to light brown/straw yellow, feel dry and brittle to touch, and seeds rattle within the pod when shaken. For green pod vegetable harvest, pick when pods are firm, plump, and snap cleanly.

Quick Reference
🌱 Method Direct Seeding
📅 Season Falgun (फागुन) – Jestha (जेठ)
⏱️ Matures 80-110 days
💧 Water Moderate (1-2 times weekly)
☀️ Sunlight Full sun
🪱 Soil Well-drained fertile sandy loam to silt loam
🗺️ Regions Terai (Winter), Mid-Hills, High-Hills (Summer/Spring)
🌡️ Temp 15–25°C
⚗️ pH 6.0–7.0
📏 Depth 4.0 cm
📦 Yield 1.5-2.5 tons/ha (Dry Grain)
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