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1. Crop Overview

• Common names: Hybrid Napier, Bajra-Napier hybrid (BN hybrid), Super Napier, Pakchong-1, elephant grass hybrid, hathi ghaas, king grass
• Scientific name: Pennisetum purpureum × Pennisetum glaucum (modern taxonomy: Cenchrus purpureus × C. americanus)
• Crop type: Perennial bunch / clump grass; C4 photosynthesis; deep-rooted; vegetatively propagated; produces tillers from base
• Life span: 4–5 years from one planting under standard management; up to 7–8 years with replanting of weak hills
• Parentage advantages: the Napier parent contributes high biomass and perenniality; the bajra parent contributes leafiness, palatability, fast regrowth and a higher leaf-to-stem ratio. The hybrid combines the best of both.
• Main varieties:
  • CO-3, CO-4, CO-5 (Tamil Nadu Agricultural University) — widely planted across India; high tillering and biomass
  • DHN-6 (Dharwad Hybrid Napier, UAS-Dharwad) — vigorous, drought-tolerant
  • APBN-1 (Andhra Pradesh Bajra-Napier) — high yield, low oxalate
  • Sampoorna (Kerala Agricultural University) — suited to Kerala's high-rainfall coastal soils
  • PBN-1, IGFRI-5, IGFRI-6 — ICAR-IGFRI varieties
  • Super Napier / Pakchong-1 — the Thai variety, now widely grown across South and Southeast Asia for its high crude protein and very fast regrowth
  • Red Napier — a red-stem ornamental-and-fodder line, slightly lower yield but very palatable
• Nutritional profile (at the right cutting stage): crude protein 8–12% (up to 16% in Super Napier), crude fibre 28–35%, dry matter 18–22% — excellent green fodder for dairy cattle, buffaloes, goats, sheep and rabbits
• Use: fresh green chop (cut-and-carry stall feeding), silage, hay (difficult due to thick stems), live windbreak / boundary, biofuel and pulp feedstock in some markets
• Sterility: the hybrid is sterile or near-sterile — cannot be propagated from seed. Always propagate from stem cuttings or root slips.

2. Climatic Requirements

• Temperature: Optimum 25–35 °C; tolerates 18–38 °C; growth slows below 15 °C; severely damaged by frost — the top dies back but the established crown usually survives and resprouts when warmth returns.
• Rainfall: 800–2500 mm; very productive in well-distributed rainfall, but the deep root system makes it surprisingly drought-tolerant once established.
• Daylength: Day-neutral; flowers rarely under tropical conditions; the hybrid in any case sets little or no viable seed.
• Sunshine: Full sun is essential; even moderate shade drops biomass sharply — do not plant under closed-canopy orchards.
• Altitude: Sea level to 2000 m; best at 0–1500 m.
• Wind: Tall canopy (3–4 m if uncut) lodges in strong wind; cut on schedule or use windbreaks.

3. Soil & Land Preparation

• Soil: Well-drained sandy loam to clay loam, deep, rich in organic matter; tolerates a wide range from sandy to heavy clay.
• pH: 5.5–7.5; tolerates mildly acidic soils better than most fodder crops.
• The non-negotiable rule: drainage. Napier rots in waterlogged soil — avoid low-lying flood-prone land.
• Plough deeply (25–30 cm) and harrow 2–3 times to a fine, level, weed-free seedbed — absolutely critical because the perennial crop will sit on this land for 4–5 years, and you cannot fix soil preparation later.
• Incorporate 20–25 t/ha well-decomposed FYM or compost at the last ploughing.
• Form ridges or raised mounds 15–20 cm high for drainage in monsoon-grown plantings, or in fields with a high water table.
• Apply basal fertilizer along the planting line just before planting (see section 8).

4. Propagation & Planting

Hybrid Napier is propagated vegetatively from one of three planting materials. The choice affects survival, establishment speed and yield.

Planting method

• Best time: at the onset of the rainy season (Jun–Jul in monsoon zones); in irrigated systems, any frost-free month with reliable water.
• Dig small planting pits or shallow furrows 8–10 cm deep at the marked spacing.
• For stem cuttings: plant cuttings at a 45° angle with 1–2 nodes below soil and 1 node above. Press soil firmly around the cutting.
• For slips / splits: plant vertical, with the root crown 5–8 cm below soil; firm soil around the base.
• Irrigate immediately after planting; light frequent irrigation for the first 21 days until shoots are established.
• First shoots emerge in 7–15 days; full establishment by 30–45 days; first cut at 75–90 days.

5. Cutting / Slip Selection & Treatment

Because the hybrid does not breed true from seed, the entire next planting depends on the quality of the cuttings or slips you use. This is the equivalent of "seed quality" in other crops.

Quantity required

• Stem cuttings (setts): 30,000–40,000 cuttings per hectare at one cutting per hill
• Rooted slips: 25,000–30,000 per hectare at one slip per hill
• Crown splits: 20,000–25,000 per hectare (each splits gives multiple shoots)

Mother-crop selection

• Source cuttings from a healthy, vigorous, true-to-type mother field of 90–120 days old. Younger material does not root well; older material is woody and slow to sprout.
• Reject any cuttings from a field showing leaf spot, stunting, smut, mosaic / streak viruses, or insect damage.
• Cut stems in the cool early morning; use a sharp knife or secateurs to avoid crushing.
• Each cutting should be 20–25 cm long with 2–3 nodes; trim the top and bottom cleanly. Nodes are the swollen rings on the stem from which roots and shoots emerge.

Treatment

• Dip the lower cut end of stem cuttings in a 0.1% carbendazim solution or Trichoderma slurry for 10 minutes before planting to prevent rot.
• Optionally, dip in a rooting-hormone solution (IBA 200 ppm) to accelerate root development — especially helpful in cool or dry conditions.
• Plant cuttings the same day they are taken, or store in shade with the bottom ends in water for no more than 48 hours.
• Cuttings stored more than 3 days lose vigour rapidly and give poor establishment.

6. Spacing & Plant Population

• Plant 1–2 cuttings (or 1 slip) per hill at the chosen spacing.
• Each hill produces 25–60 tillers at maturity — a single planting can become a clump 1–1.5 m wide over 2–3 years.
• Replant any hill that fails to establish within the first 30 days — gaps reduce per-cut yield and let weeds in.

7. Cutting Cycle & Stubble Management

This is the single most important skill in growing hybrid Napier. The crop is perennial — you are cutting it 7–10 times a year for 4–5 years — and the way you cut decides how long it stays productive. Cut too low and the crown is destroyed and the planting collapses. Cut too tall and the fodder becomes fibrous and the crown becomes congested. Cut at the wrong age and you sacrifice either yield or protein.

The three cutting rules

• Rule 1 — Cut at the right stage: cut when the canopy is 1.5–2.5 m tall (after the second cut) and before flowering. Below 1.2 m the yield is sub-optimal; above 3 m the stem is fibrous, leaf-to-stem ratio drops, and crude protein falls below 8%.
• Rule 2 — Cut at the right height: leave a stubble of 5–10 cm (about 4 finger-widths above the soil). Stubble below 5 cm damages the crown and the next regrowth is weak. Stubble above 15 cm leaves wasted woody stem and the new shoots emerge thin and stunted.
• Rule 3 — Cut on a schedule: first cut at 75–90 days; subsequent cuts every 40–60 days during the active growing season; longer in cool weather. Do not stretch the interval to "save labour" — the grass becomes fibrous and the regrowth slows for the rest of the year.

Cuts per year by climate

Renovation

• After 4–5 years, productivity declines as crowns become congested and old wood accumulates.
• Renovation cut: at the end of year 4, cut the whole field at ground level (2–3 cm stubble only), top-dress with FYM and N, and irrigate — the crop will resprout strongly for another 2–3 years.
• If even renovation cuts fail to revive vigour, replant from fresh cuttings of a new mother field.

8. Nutrient Management (per hectare per year)

Hybrid Napier is one of the heaviest feeders in agriculture — the high biomass it removes must be replaced every year. Indicative annual dose:

• For dairy farms with abundant manure, replace 30–50% of mineral N with slurry or composted manure applied after each cut — sustains soil organic matter and keeps long-term productivity high.
• Fertigation through drip irrigation in commercial fields gives the most uniform regrowth and the highest biomass per unit of fertilizer.
• The "feed after every cut" rule is what sustains 250–400 t/ha annual yield. Skipping the post-cut N dose drops the next cut by 30–50%.

9. Irrigation

• Napier is drought-tolerant once established — the deep root system survives long dry spells — but yields much more with irrigation.
• Establishment (first 30 days): light irrigation every 3–4 days until shoots are well-established.
• Active growing season: irrigate every 7–10 days; more frequent on sandy soils and in hot dry weather.
• Critical: irrigate immediately after every cut to push the next regrowth flush. Combine with the post-cut N dose.
• Avoid waterlogging at any stage — even short waterlogging (24–48 hours) can damage the crown.
• Drip irrigation with sub-surface laterals between rows is ideal for commercial / dairy fields — saves water, allows fertigation, and is undisturbed by repeated cutting.

10. Weed & Intercultural Care

• The first 45 days are the most critical for weed control — the young clump cannot compete until the canopy closes.
• Hand-weed or inter-row hoe at 20–25 days and again at 40–45 days; thereafter the canopy closes and suppresses weeds.
• From year 2 onwards, an annual hoeing in spring (when growth restarts) is enough; the dense clumps suppress most weeds.
• Earthing-up the crown each year before the rainy season strengthens the hill base and stops the crown from rising above the soil over time.
• Intercropping with a legume (Stylo, Hedge Lucerne, Lablab, Cowpea) in the inter-row in the establishment year and at every renovation:
  • Improves the protein balance of fodder fed to livestock
  • Fixes 60–80 kg N/ha for the Napier
  • Suppresses weeds and keeps the soil covered
  • One of the highest-impact agronomy decisions for long-term productivity
• Inspect after every cut and replant any weak or dead hills with fresh cuttings to keep the stand uniform.

11. Plant Protection — Pests

Napier has remarkably few serious pests, but a handful can cause damage in commercial fields:

12. Plant Protection — Diseases

13. Anti-Nutritional & Quality Issues

Beyond plant pests and diseases, Napier has a few well-known issues that affect the animal that eats it. Know them, plan around them, and the fodder is safe and excellent.

Oxalate accumulation

• Napier accumulates soluble oxalates (especially under high-nitrogen fertilization in young regrowth).
• Risk: chronic feeding of pure Napier to dairy cattle can interfere with calcium absorption and milk yield; high-oxalate Napier is dangerous for horses (causes "big head" / nutritional secondary hyperparathyroidism).
• Solution: always feed Napier mixed with low-oxalate fodder (legume forage like Stylo, Lucerne, Berseem, or cereal fodder like maize), ideally 60–70% Napier and 30–40% legume by weight. Choose modern low-oxalate hybrids (APBN-1, Super Napier). Do not feed pure young heavily fertilised Napier to horses.

HCN / prussic acid in very young regrowth

• Very young Napier regrowth (under 1 m tall, or in plants under drought / frost stress) can contain hydrocyanic acid (HCN) at unsafe levels.
• Solution: never cut and feed Napier under 1 m / under 60 days from the previous cut. Wilt the cut fodder for 4–6 hours in the shade before feeding, which dissipates HCN. Ensiling for 3 weeks also breaks down HCN completely.

Mature, fibrous fodder

• If the cut is delayed past 70–80 days, stems become woody, crude protein drops below 7%, palatability falls, and animals reject it.
• Solution: cut on schedule. If you have an unavoidable surplus, ensile it for later use rather than letting it stand too long.

Lodging

• Heavy clumps with thin stems lodge in wind and heavy rain, especially if N is excessive.
• Solution: balanced N–K fertilizer, cut on time, and use a windbreak in exposed fields.

Establishment failure

• Patchy stand from old / dry cuttings, cold soil, waterlogging at planting, or termite attack.
• Solution: plant fresh cuttings same day, ensure warm moist soil, treat cuttings against rot, and replant gaps within 30 days.

14. Harvesting & Utilisation

Cutting for fresh fodder ("cut-and-carry")

• First cut at 75–90 days from planting; subsequent cuts every 40–60 days (see section 7 for full cutting rules).
• Cut in the cool morning with a sharp sickle, machete or motorised fodder cutter; leave 5–10 cm of stubble.
• Wilt the cut fodder for 4–6 hours in the shade before feeding — this reduces HCN and improves intake.
• Chop into 2–3 cm pieces with a chaff cutter before feeding to dairy cattle for better intake and lower wastage.

Silage

• Napier silage is excellent — preserves surplus fodder from the rainy season for use in the dry season.
• Chop fresh-cut Napier to 2–3 cm pieces and pack tightly into a pit, drum or bag silo.
• For best silage, add 1–2% molasses (or crushed maize) to provide sugar for the fermentation; add 0.5% urea to lift crude protein.
• Compress the silo tightly to exclude air and seal with plastic + soil cover.
• Ready to feed after 21–30 days of anaerobic fermentation; keeps for 9–12 months.

Hay

• Napier hay is difficult to make because of the thick stems — dry in 4–6 days under hot sun, turn frequently, or split stems to accelerate drying.
• Most growers prefer silage over hay for this crop.

Yield

• Standard management: 200–300 t/ha/year green fodder.
• High-input commercial dairy: 300–400 t/ha/year green fodder (~40–80 t/ha/year dry matter).
• Super Napier under best management: up to 500 t/ha/year reported in tropical irrigated conditions.
• Yield rises in years 2–3, peaks, and gradually declines after year 4 — renovate or replant accordingly.

15. Country-Wise Climate & Planting Guide

Hybrid Napier thrives in warm, frost-free, well-drained sites. Plant at the onset of the rainy season in rainfed dryland systems, or any frost-free month in irrigated systems. Windows below are indicative — adjust to local altitude and micro-climate.

16. Frequently Asked Questions