Complete Farming Guide
Lentils Farming Guide
Lens culinaris
6.6 million tonnes produced globally — the fastest-cooking pulse and a protein powerhouse
Lentils (masoor dal) are one of the oldest cultivated crops, domesticated over 8,000 years ago in the Fertile Crescent. They are the most widely consumed pulse in South Asia, where dal and rice form the primary protein source for hundreds of millions of people. India, Canada, Turkey, and Bangladesh are the top producers. Lentils are nutritional powerhouses: 25% protein, high in iron and folate, and cook faster than any other pulse (15-20 minutes vs 60+ minutes for chickpeas). As a legume, they fix atmospheric nitrogen and improve soil health.
Quick Facts
Growing Season
Rabi (Winter/Cool Season)
Growth Period
90-120 days
Optimal Temp
15-25 degrees C (59-77 degrees F)
Water Needs
250-400mm
Top Producer
Canada
Yield / Acre
0.3-0.8 tonnes
Lentils Growth Stages — What to Do at Every Stage
Germination & Emergence
Days 0-12What to do
Sow seeds at 3-4 cm depth in moist soil. Use 12-15 kg seed/acre. Inoculate with Rhizobium (Rhizobium leguminosarum) for nitrogen fixation. Treat seed with Thiram (2g/kg) + Rhizobium. Row spacing 25-30 cm. Sowing time is critical — too late reduces yield significantly.
Watch for
Poor emergence from surface crusting or deep sowing. Seed rot in waterlogged conditions. Cutworm damage on young seedlings.
Vegetative Growth
Days 13-40What to do
Hand-weed at 25-30 days or use pre-emergence herbicide (pendimethalin). Lentils are short (25-40cm) and poor weed competitors. No nitrogen fertilizer needed — Rhizobium is fixing N. One light irrigation at 30 days if soil is dry.
Watch for
Weed competition is the single biggest yield-limiting factor. Rust appearing on lower leaves. Aphid colonies on growing tips.
Flowering
Days 41-65What to do
Flowering starts at the lowest nodes and progresses upward. Lentils are self-pollinating. Critical irrigation at early flowering if soil moisture is low. Do NOT over-irrigate — excess moisture promotes disease and lodging.
Watch for
Rust pustules spreading rapidly on leaves. Ascochyta blight in wet, cool conditions. Flower drop from heat stress above 30 degrees C.
Pod Development & Maturity
Days 66-100What to do
Pods fill over 3-4 weeks. No additional inputs needed. Monitor for pod borer (if present). Stop all irrigation. Harvest when 80-90% of pods turn straw-yellow and plants have mostly dried down.
Watch for
Lodging (plants falling over) makes harvest difficult. Pod shattering from delayed harvest in hot, dry winds. Wilt (Fusarium) causing premature plant death.
Harvest & Post-Harvest
Days 101-120What to do
Pull or cut plants close to the ground (lentil pods are very close to the soil surface). Stack and sun-dry for 3-5 days. Thresh when moisture reaches 12%. Mechanical harvest requires flat fields and even plant height. Store at 10-12% moisture in dry conditions.
Watch for
Shattering losses increase rapidly after full maturity (5-10% per day of delay). Soil contamination during harvest (lentil pods are only 5-10cm above ground). Bruchid beetle damage in storage.
Common Lentils Diseases — Identification Guide
Rust
Uromyces viciae-fabae
What you will see
Small, round, reddish-brown pustules on both leaf surfaces and stems. Pustules rupture to release rusty-brown spores. Severe infections cause complete defoliation and premature death. Can cause 50-70% yield loss in susceptible varieties when conditions favor rapid spread.
Conditions that favor it
Warm (20-25 degrees C), humid conditions with dew or light rain. Wind-borne spores spread rapidly. Most severe in late-sown crops where flowering coincides with warm, humid weather. South Asia and Ethiopia are most affected.
Ascochyta Blight
Ascochyta lentis
What you will see
Tan to brown lesions on leaves, stems, and pods. Stem lesions may girdle the stem, killing everything above. Pod lesions cause seed infection (dark, shriveled seeds). Dark pycnidia (fruiting bodies) visible in lesions with a hand lens.
Conditions that favor it
Cool (15-20 degrees C), wet conditions with rain and high humidity. Seed-borne — always use clean, certified seed. Rain splash spreads spores within the field. Most severe in temperate lentil-growing regions (Canada, Australia).
Fusarium Wilt
Fusarium oxysporum f. sp. lentis
What you will see
Progressive wilting starting from the top of the plant. Leaves droop, turn yellow, then brown while remaining attached. Vascular tissue shows dark brown discoloration when the stem is split. Seedling wilt causes rapid death of young plants. Root examination shows brown, rotted roots.
Conditions that favor it
Warm soil temperatures (25-30 degrees C). Soil-borne pathogen persisting for years. Continuous lentil cropping increases inoculum. More severe in light, sandy soils and under moisture stress.
Stemphylium Blight
Stemphylium botryosum
What you will see
Small, light brown spots on leaflets that expand to cover the entire leaflet. Affected leaves dry up and drop. Under humid conditions, entire plants can defoliate within a week. Also causes pod spots and seed infection.
Conditions that favor it
Warm (25-30 degrees C), humid conditions common in the Indo-Gangetic plains. Fog and heavy dew favor infection. Increasingly severe in Bangladesh, eastern India, and Nepal.
Common Lentils Pests — Identification & Damage
Aphids (Aphis craccivora)
Damage
Colonies build up on growing tips and flower buds, sucking sap and causing stunting, curling, and flower drop. Honeydew promotes sooty mold. Heavy infestations during flowering can reduce pod set by 30-50%.
How to identify
Shiny, black aphids clustered on shoot tips and undersides of young leaves. Check plants when temperatures warm up in late season. Natural enemies (ladybugs, hoverflies) often provide adequate control. Spray only if threshold is exceeded: 10-15 aphids per plant tip.
Pod Borer (Etiella zinckenella)
Damage
Larvae bore into pods and feed on developing seeds. A single larva can damage 3-5 pods. Creates entry points for secondary fungal infections. More important in South Asian and Ethiopian lentil production.
How to identify
Small (15mm), olive-green caterpillars with a pinkish tinge. Entry holes on pods with frass. Adults are small gray moths. Shake plants over a white tray to dislodge larvae from pods.
Bruchid Beetle (Bruchus lentis)
Damage
Adults lay eggs on ripening pods in the field. Larvae bore into seeds and develop inside, emerging as adults in storage. Infested seeds have characteristic round exit holes and lose germination, nutritional value, and market value.
How to identify
Small (3-4mm), dark beetles with mottled wing covers. Round exit holes in stored lentils. Infestation starts in the field but damage becomes apparent in storage. Use hermetic storage (PICS bags) or cold treatment (-18 degrees C for 7 days) for control.
Lentils Nutrient Management — NPK Guide
Nitrogen
Starter only: 8-10 lb N/acre (Rhizobium fixes 40-60 lb N/acre)
Phosphorus
25-35 lb P2O5/acre — most critical nutrient for lentils
Potassium
15-20 lb K2O/acre based on soil test
Application Timing
All fertilizer applied at sowing as basal dose. Seed inoculation with Rhizobium (Rhizobium leguminosarum) is essential if lentils have not been grown in the field for 3+ years. Apply sulfur (8-12 lb S/acre) on sulfur-deficient soils. Foliar application of molybdenum (sodium molybdate, 50g/acre) improves nitrogen fixation efficiency.
Lentils Irrigation Schedule
Total Water Requirement
10-16 inches (250-400mm) total crop water use
Critical Stages
Pre-sowing irrigation for uniform germination, one irrigation at branching/early flowering (35-45 days). Lentils are extremely sensitive to waterlogging — even 24 hours of standing water can kill the crop.
Irrigation Frequency
Maximum 1-2 irrigations in the entire season. Many lentil crops are grown entirely on residual soil moisture (conserved from the previous monsoon season). Over-irrigation causes root rot, lodging, and excessive vegetative growth. Raised-bed planting in waterlogging-prone areas improves survival.
Lentils Economics — Cost, Yield & Profit
Cost per Acre
$100-200/acre (India/Bangladesh)
Yield per Acre
0.3-0.8 tonnes/acre
Revenue per Acre
$200-500/acre
Profit per Acre
$80-300/acre
Regional Context
Lentils are a low-input crop with modest but reliable returns. In India, the MSP for masoor is around $500-600/tonne. International prices (Canadian red lentils) range from $500-1,000/tonne. India is both the largest producer and consumer, and also the largest importer (from Canada, Australia, Turkey). Processing into split dal (masoor dal) adds 30-50% value. The crop is valuable in the farming system beyond its grain yield: it fixes nitrogen (saving $30-50/acre in fertilizer for the next crop), its residues improve soil organic matter, and its short duration (100-110 days) fits well between rice and wheat in the Indo-Gangetic rotation.
Frequently Asked Questions — Lentils Farming
When is the best time to sow lentils?
Optimal sowing time is critical for lentil yield. In South Asia (India, Bangladesh, Pakistan), sow in late October to mid-November — after rice harvest and before the soil dries out too much. Delayed sowing beyond November reduces yield by 30-50 kg/hectare for each week of delay because the crop encounters heat stress during pod filling. In Canada, sow as soon as the soil can be worked in spring (late April to mid-May). In Ethiopia, sow at the start of the meher (main) rains in June-July. The principle is consistent: lentils need cool temperatures during flowering and pod fill, so time sowing so that these stages avoid high heat.
Why do my lentil plants lodge (fall over)?
Lentil plants are inherently weak-stemmed (25-40cm tall, thin stems) and prone to lodging. Causes: (1) Excessive soil moisture or nitrogen promotes tall, weak growth. (2) Dense plant population (seeding rate too high). (3) Wind and rain during pod fill. (4) Some varieties are more lodging-prone. Solutions: use semi-erect varieties with stronger stems, maintain recommended seeding rate (12-15 kg/acre), avoid over-irrigation, and grow on well-drained soils. In Canada, chemical desiccation (glyphosate or diquat) is used before harvest to dry down lodged crops. Hand harvesting (pulling) is easier on lodged crops than mechanical harvest.
How do I prevent rust in lentils?
Lentil rust (Uromyces viciae-fabae) can devastate the crop if not managed early. Prevention: (1) Sow early — timely sowing ensures the crop matures before warm, humid conditions favor rust. (2) Use resistant varieties — the most effective and cheapest method. Ask your local extension for rust-resistant lines. (3) Avoid late nitrogen application, which promotes lush growth susceptible to rust. (4) Scout weekly from flowering onward — look for small, brown pustules on leaves. (5) Apply fungicide (mancozeb at 1kg/acre or propiconazole at 0.5 ml/liter) at the first sign of rust. A second spray 10-14 days later may be needed if conditions remain favorable. (6) Crop rotation with non-host crops (cereals, oilseeds) for at least 2 years reduces soil inoculum.
What is the difference between red and green lentils?
Red lentils (masoor dal) are the most widely consumed type in South Asia. They are actually brown or green on the outside but reveal orange-red cotyledons when the seed coat is removed (split/decorticated). They cook quickly (15-20 minutes), lose their shape, and are used for dal and soups. Green lentils (often Puy-type or large green) retain their shape after cooking and are used in salads and side dishes. They take 25-30 minutes to cook. From a farming perspective, both are varieties of the same species (Lens culinaris), but red/brown lentils dominate South Asian production while green lentils are more popular in Canada, France, and the Middle East. Choose based on your market — in South Asia, red masoor lentils fetch the best price.
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