Mucuna bracteata (MB): Cover Crop Guide for Tropical Plantations

Mucuna bracteata (MB) is a vigorous, deep-rooting leguminous cover crop used across tropical oil palm and rubber plantations. It fixes nitrogen, forms a dense ground cover that reduces erosion and weeds, and builds soil organic matter through heavy biomass. Unlike smaller legume seeds, MB is established by raising seedlings in a nursery and transplanting them, not by broadcast sowing.

What is Mucuna bracteata?

Mucuna bracteata is a tropical legume grown as a leguminous cover crop (LCC) in plantation systems. It is valued for fast, vigorous growth, deep rooting, drought tolerance, and the ability to form a thick living mulch between young trees. In association with Rhizobium bacteria in its roots, it fixes atmospheric nitrogen and returns nutrients to the soil through leaf litter.

Why plantations use Mucuna bracteata

Nitrogen fixation

15N isotope-dilution studies under oil palm report that MB derives 67 to 84 percent of its nitrogen from biological fixation, contributing on the order of 150 to 200 kg N per hectare per year in plantation conditions (MPOB Oil Palm Bulletin 60). This can reduce reliance on applied nitrogen during the immature phase.

Ground cover and erosion control

MB spreads quickly to cover bare inter-rows, protecting soil from rainfall impact and runoff on slopes. A dense cover lowers soil loss and helps retain moisture during dry spells.

Pengendalian gulma

By shading the ground, an established MB cover limits light to weeds and reduces manual and chemical weeding in inter-rows.

Biomass and soil organic matter

MB produces large amounts of biomass, up to about 28 t/ha dry matter in the open and around 13 t/ha under 60 to 70 percent shade (MPOB). Decomposing litter feeds soil organic matter and soil biology over time.

How to establish Mucuna bracteata

Because MB seed is large and relatively costly, estates establish it through a nursery rather than broadcasting:

1. Prepare the seed. Hard MB seed benefits from scarification, commonly a hot-water soak, to improve and synchronise germination.
2. Raise seedlings. Germinate and grow seedlings in polybags in a nursery until they are ready to transplant.
3. Transplant. Plant out around 320 seedlings per hectare along the inter-rows (MPOB best management practice on peat). This needs roughly 85 to 100 g of seed per hectare.
4. Establish early. Set MB out before or alongside young palm or rubber so the cover is in place during the vulnerable immature phase.

Where Mucuna bracteata fits, and where it does not

Well suited to: immature and young oil palm and rubber, sloping sites that need erosion control, and blocks where rapid ground cover plus a nitrogen contribution are priorities.

Less suitable for: heavily shaded sites once the canopy has closed, where biomass falls, and very dry sites without attention to establishment. On mature, closed-canopy estates, shade-tolerant species often play a larger role.

Mucuna bracteata compared with other cover crops

MB typically produces more biomass than conventional leguminous cover crop mixtures, but it is established by transplanting rather than broadcast sowing. Smaller-seeded species such as Pueraria javanica, Calopogonium mucunoides, and Centrosema pubescens are broadcast at a few kilograms per hectare and are quicker and cheaper to sow. Many estates combine MB with these species. See the five-species comparison and the best cover crop for oil palm by growth stage guide.

Pertanyaan yang Sering Diajukan

How much Mucuna bracteata seed do you need per hectare?
MB is nursery-raised and transplanted, not broadcast. Plan around 320 seedlings per hectare, which needs roughly 85 to 100 g of seed per hectare via a polybag nursery (MPOB best management practice).

How much nitrogen does MB fix?
15N studies report MB derives 67 to 84 percent of its nitrogen from biological fixation, contributing about 150 to 200 kg N per hectare per year in plantation conditions (MPOB Oil Palm Bulletin 60).

How much biomass does MB produce?
Up to about 28 t/ha dry matter in the open and around 13 t/ha under 60 to 70 percent shade (MPOB).

Does MB grow under oil palm shade?
It establishes well in immature and young plantings with light to moderate shade; biomass declines as the canopy closes.

How is MB different from Pueraria javanica?
MB produces more biomass and is transplanted from a nursery, while Pueraria javanica is broadcast-seeded at about 2 to 4 kg per hectare. Many estates use them together.

Related reading

• Mucuna Bracteata (MB): The Complete Plantation Guide
• Mucuna bracteata Kelapa Sawit: Panduan Lapangan untuk Distributor dan Pengelola Perkebunan
• Pueraria javanica vs Mucuna bracteata: Which Cover Crop Suits Your Estate?
• Panduan Penanaman Tanaman Penutup Tanah: Dari Penanaman hingga 80% Tutupan Tanah

Sources: MPOB Oil Palm Bulletin 60 (Cheah et al.), 15N nitrogen fixation in Mucuna bracteata; MPOB TT-501, Mucuna bracteata as ground cover crop on peat; Tropical Forages database (CSIRO, CIAT, ILRI). Figures are given with method and context; results depend on site, soil, rainfall, and management. Last reviewed May 2026.