Calopogonium mucunoides (CM): Cover Crop Guide for Tropical Plantations

Calopogonium mucunoides fast-establishing pioneer cover crop

Calopogonium mucunoides (CM) is a fast-establishing pioneer leguminous cover crop used in young tropical oil palm and rubber plantations. It provides quick early ground cover, fixes nitrogen, and helps control erosion. CM is broadcast-seeded and is commonly grown in mixtures, where it acts as a nurse crop alongside more persistent species.

Quick facts

  • Type: fast-establishing pioneer legume cover crop
  • Nitrogen: PROSEA reports about 65 kg N per hectare accumulated in leaves, shoots and roots by a 3-month green manure crop in one experiment. That is nitrogen accumulated in biomass, not nitrogen measured as fixed, and it is not an annual rate. No annual fixation rate for CM exists in any source we can trace.
  • Biomass: about 6 to 10 t/ha dry matter per year
  • Seeding: 4 to 6 kg/ha in monoculture, 1 to 3 kg/ha as the CM component of a mixture; broadcast after scarifying
  • Best for: rapid early cover and erosion control in young oil palm and rubber, and as a nurse species in mixtures

What is Calopogonium mucunoides?

Calopogonium mucunoides is a vigorous, fast-growing legume grown as a cover crop in young plantation stands. It germinates and spreads quickly to cover bare soil soon after planting, which is why it is valued as a pioneer or nurse crop. It fixes nitrogen in association with Rhizobium and adds organic matter as it grows.

Why plantations use Calopogonium mucunoides

Fast early cover and erosion control

CM establishes quickly, putting a protective cover over bare inter-rows soon after planting. This is particularly useful for erosion control on freshly opened or sloping land before slower species fill in.

Nitrogen contribution

The one figure we can trace to a citable source is from PROSEA: about 65 kg N per hectare accumulated in leaves, shoots and roots by a 3-month green manure crop, in a single experiment. Three things about it matter. It is nitrogen accumulated in biomass, not nitrogen measured as fixed from the atmosphere. It is a one-off accumulation over three months, not an annual rate. And it comes from one experiment, not a body of replicated field work. We previously published a considerably higher per-hectare figure on this page attributed to a Philippine field study; we could not verify that study, so we have withdrawn the figure rather than replace it with another number.

Nurse crop in mixtures

Because it covers fast but fades as shade increases, CM is commonly sown with persistent species such as Centrosema pubescens or Calopogonium caeruleum, giving early protection while the longer-lived species establish.

How to establish Calopogonium mucunoides

  1. Scarify the seed. A hot-water soak improves and evens out germination of hard seed.
  2. Broadcast. Sow at 4 to 6 kg/ha in monoculture, or 1 to 3 kg/ha as the CM component of a mixture. For a full mixture, the best-cited published reference is MPOB TT No. 501 (Information Series 588, June 2012), Table 1 treatment C2: PJ 4 : CP 3 : CC 1, total 8 kg/ha, with 5 g of Rhizobium (RRI strain) inoculant per kg of seed. That is an institutional best-management-practice recommendation from a peat trial, not a primary field measurement.
  3. Sow early. Establish soon after land preparation so the fast cover protects the soil during the vulnerable opening phase.

Where Calopogonium mucunoides fits, and where it does not

Well suited to: young and newly opened oil palm and rubber, slopes needing fast erosion control, and mixtures where rapid early cover is the priority.

Less suitable for: long-term cover under a closing canopy, where it fades. For persistence, combine it with or follow it with Centrosema pubescens or Calopogonium caeruleum, the two shade-persistent successors, or with Mucuna bracteata, which is shade-tolerant and carries heavy biomass under a maturing canopy.

Compared with other cover crops

CM is the speed specialist. Centrosema pubescens and Calopogonium caeruleum are more persistent under shade; Pueraria javanica is a strong all-rounder on open and immature ground but thins as the canopy closes; Mucuna bracteata produces the most biomass, tolerates shade, and is transplanted rather than broadcast. See the five-species comparison and the cover crops guide.

Frequently asked questions

What is Calopogonium mucunoides?
A fast-establishing pioneer legume cover crop for quick early cover in young tropical plantations.

How much CM seed per hectare?
About 4 to 6 kg/ha in monoculture, or 1 to 3 kg/ha as the CM component of a mixture; broadcast after scarifying.

How much nitrogen does CM contribute?
We are not able to give you an annual fixation rate for CM, and we would rather say that than invent one. PROSEA reports about 65 kg N/ha accumulated in leaves, shoots and roots by a 3-month green manure crop in one experiment. That is accumulation in biomass rather than measured fixation, and it is not an annual figure.

Does CM persist?
It is a fast pioneer that fades as the canopy closes; pair it with persistent species for long-term cover.

Related reading

Get Calopogonium mucunoides seed and agronomy support

Chemiseed supplies Calopogonium mucunoides and other tropical cover crop seeds with germination-tested seed and agronomic guidance. View the Calopogonium mucunoides (CM) product page, request a quote, or plan quantities with the cover crop calculator.

Sources: PROSEA (Plant Resources of South-East Asia), Calopogonium mucunoides; MPOB TT No. 501 / Information Series 588 (June 2012); Tropical Forages database (CSIRO, CIAT, ILRI). Figures are given with method and context; results depend on site, soil, rainfall, and management. Last reviewed August 2026.