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Sweet Potato Farming in Arunachal Pradesh: Practical Guide

A hands-on guide for smallholders in Arunachal Pradesh covering site selection, soil preparation, planting, crop care, harvest and post-harvest handling to improve sweet potato performance.

Ranjeet Natarajan
Ranjeet Natarajan July 28, 2026 6 min read 1,136 words
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Sweet Potato Farming in Arunachal Pradesh: Practical Guide

Why sweet potato in Arunachal Pradesh?

Sweet potato is well-suited to the varied agro-ecologies of Arunachal Pradesh: it grows on slopes, in valley fields and in shifting cultivation systems; tolerates marginal soils; and is a quick-maturing, calorie-dense crop for household food security and market sales. The crop also fits well into crop rotations and can help rehabilitate degraded soils when managed properly.

Site selection and soil

Choose sites with:

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  • Well-drained soils — sweet potato roots will rot in waterlogged ground.
  • Slightly acidic to neutral pH (5.5–7.0). Many areas in Arunachal are mildly acidic; lime can be used where pH is very low.
  • Moderate fertility — sweet potato tolerates low fertility but responds to moderate levels of phosphorus and potassium.
  • Gentle slopes or terraces on steeper ground to reduce erosion and allow mechanical access if required.

Avoid heavy clay pans that hold water. If only heavy soils are available, build raised beds or ridges to improve drainage.

Variety choice

Select varieties adapted to local conditions and markets. Consider:

  • Local landraces that are proven in your village for taste and storage.
  • Improved varieties for higher yield, pest/disease tolerance or flesh color preferred in market (orange-fleshed varieties have higher beta‑carotene).

Trial 1–2 varieties on small plots before scaling up to learn their growth habit and maturity.

Land preparation

Prepare land after the rainy season subsides and soil is workable. Steps:

  • Clear crop residues and weeds.
  • Plough or dig to a fine tilth to a depth of 15–25 cm; on slopes, form ridges or beds aligned across slope to reduce runoff.
  • If soil fertility is low, incorporate well-decomposed farmyard manure (5–10 t/ha) or compost during final land preparation.

Planting material and propagation

Sweet potato is normally propagated from vine cuttings (slips). For best results:

  • Use healthy, disease-free mother plants to raise clean slips in a nursery.
  • Cut vine sections 20–30 cm long with several nodes; plant them horizontally or vertically in moist soil or propagate in rooting beds.
  • Raise slips 3–4 weeks until they are 20–30 cm long and ready for transplanting.

Sowing time and spacing

Sowing time depends on local rainfall patterns. In Arunachal Pradesh you can plant:

  • Main season: early in the growing season after soils warm and remain moist (often March–May in lower valleys).
  • Second season: in areas with bimodal rainfall, a late-summer planting may be possible but riskier due to cyclonic rains.

Recommended spacing varies by purpose. Common spacings:

  • For tuber production: 75–100 cm between rows and 25–35 cm within the row for medium vine types.
  • Closer spacing can be used for leaf production (greens) or when planting on ridges.

Fertilizer and nutrient management

Sweet potato responds to balanced nutrients, particularly phosphorus and potassium. Practical approach for smallholders:

  • Apply farmyard manure or compost at 5–10 t/ha during land preparation.
  • If using chemical fertilizers on low-fertility soils, a basal dose of NPK (for example 20–40 kg N, 40–60 kg P2O5 and 40–80 kg K2O per hectare) can be split and adjusted based on soil test results and crop vigor. Avoid excess nitrogen late in the season as it promotes vines over root bulking.
  • Micronutrients: zinc or boron may be deficient on some acidic soils; use only after a soil test or visible deficiency symptoms.

Weed, water and intercultural care

Weed control is critical in the first 6–8 weeks. Methods:

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  • Hand weeding or light hoeing between rows; avoid damaging roots and slips.
  • Mulching with straw or foliage conserves moisture, suppresses weeds and can reduce erosion on slopes.

Water management:

  • Sweet potato is relatively drought-tolerant but needs adequate moisture during root initiation and bulking. Irrigate or divert runoff to maintain soil moisture in dry spells.
  • Avoid prolonged waterlogging.

Pest and disease management

Common issues in Arunachal Pradesh include sweet potato weevils, stem borers, foliar diseases and virus complexes. Practical controls:

  • Start with disease-free planting material and healthy mother plants to reduce virus buildup.
  • Field hygiene: remove and burn infected vines and rotten tubers; rotate crops away from previous sweet potato fields for 2–3 seasons where possible.
  • Use pheromone or light traps for some pests where available; handpick and destroy large pests.
  • Timely planting and avoiding late-season excess humidity reduce disease pressure. When chemical control is necessary, choose registered products and follow label directions — consult local extension for approved options.

Harvesting

Sweet potato is typically ready 4–6 months after planting depending on variety and growing conditions. Signs for harvest:

  • Vine yellowing and dieback.
  • Roots reach desirable market size — check by gently digging around representative plants.

Harvest carefully to avoid cuts and bruises; damaged tubers store poorly. Use a fork or spade to lift roots, keeping a safe distance from the roots to reduce nicks.

Post-harvest handling and storage

Immediately after harvest:

  • Brush off soil but avoid washing unless the tubers will be sold immediately.
  • Grade by size and quality; set aside damaged or rotten roots for prompt consumption or processing.
  • Cure tubers for 5–10 days at warm (25–30°C) and humid conditions if possible — curing heals skin cuts and extends storage life.
  • Store cured tubers in a cool, ventilated, dry place on racks or in bins to reduce rot. Avoid direct sunlight and frost.

Yield expectations and improving productivity

Yields vary widely with variety, soil fertility and management. Smallholders often see large variability; by focusing on clean planting material, timely weeding, balanced nutrition and good drainage you can significantly improve performance.

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Steps to increase yield:

  • Maintain quality seed systems — produce and select healthy mother plants.
  • Adopt ridging or raised beds on heavier soils.
  • Use mulches and organic amendments to build soil organic matter and moisture retention.
  • Practice crop rotation to reduce pest and disease cycles.

Marketing and value addition

Market options in Arunachal Pradesh:

  • Local fresh markets and weekly haats — strong demand for table-quality roots.
  • Local processing: drying, chips, or simple baking and packaging for roadside sales.
  • Supply to institutional buyers such as schools or government food programs if volumes are consistent.

Value addition increases shelf life and returns. Consider small-scale drying, slicing and drying for chips, or producing boiled/roasted sweet potato snacks for local sale.

Practical tips for smallholders

  • Keep a small seed bed of healthy mother plants each season — it saves money and reduces disease risk from unknown sources.
  • Work with neighbour groups to bulk produce for markets; shared processing units for drying or cooking can add value.
  • Document what works on your plots — variety, spacing, manure rates and harvest time — then scale the best combination.

Where to get help

Contact the local Krishi Vigyan Kendra (KVK), state horticulture or agriculture department for recommended varieties, localized fertilizer advice and pest management options. Extension officers can also help with market linkages and training on post-harvest handling.

Final note

Sweet potato can be a resilient, quick-return crop for smallholders in Arunachal Pradesh when attention is paid to clean planting material, drainage, timely weeding and simple post‑harvest curing. Start small, record results, and adapt practices to your local microclimate and market preferences.

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Ranjeet Natarajan
Ranjeet Natarajan

Contributing writer at Agriculture Novel — telling the stories that sustain us.

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