Cover Crop Seeding Rate Guide for the Philippines

Cover Crop Seeding Rate Guide for the Philippines

Sowing cover crop seed into soil by hand, illustrating seeding rate application
For tropical legume cover crops, single-species broadcast seeding rates are Pueraria javanica 4 to 6 kg/ha, Calopogonium mucunoides 4 to 6 kg/ha, Centrosema pubescens 3 to 4.5 kg/ha, and Calopogonium caeruleum 3 to 4.5 kg/ha. For a mixed legume stand there is no single universal figure: published institutional recommendations fall in a band of roughly 5 to 15 kg/ha of total legume seed, clustering at 6 to 12 kg/ha. The best-cited figure is 8 kg/ha (Pueraria javanica 4 + Centrosema pubescens 3 + Calopogonium caeruleum 1), which the Malaysian Palm Oil Board specifies as the conventional legume cover crop mixture. Mucuna bracteata is not broadcast: it is raised in a polybag nursery and transplanted at about 320 seedlings/ha, needing roughly 85 to 100 g of seed per hectare.

These rates are the values Kudzu Seeds Trading uses with growers across Mindanao, the Visayas, and Luzon. They are reconciled against the published agronomic literature (MPOB, PROSEA, Tropical Forages, FAO, and Malaysian estate survey data) rather than the inflated single-species figures that circulate on many supplier sites and cause growers to over-order seed. State the establishment method alongside any rate, because the right number depends on whether you are sowing a single species, a mixture, or transplanting.

Recommended seeding rates by species

Species Single species (broadcast) Component within a mixture Method note
Pueraria javanica (PJ) 4 to 6 kg/ha 3 to 7.5 kg/ha The dominant pioneer component in almost every published mix
Calopogonium mucunoides (CM) 4 to 6 kg/ha 1 to 3 kg/ha Fast early establishment; short-lived pioneer
Centrosema pubescens (CP) 3 to 4.5 kg/ha 0.5 to 3 kg/ha Shade-tolerant; 3 kg/ha in the MPOB blend, 0.5 kg/ha as a minor persistent component in four-species estate mixes
Calopogonium caeruleum (CC) 3 to 4.5 kg/ha 0.6 to 1.5 kg/ha Shade-tolerant, slow start, persistent; expensive and a poor seeder, so usually the smallest component and often established from cuttings
Mucuna bracteata (MB) Not broadcast Transplanted Polybag nursery, then transplant ~320 seedlings/ha; ~85 to 100 g seed/ha

The component figures are shares of a total mixture rate, not stand-alone rates. They do not sum to a recommended blend on their own: the governing number for any blend is the total rate for the mixture as sown, given in the next section. Confirm the split with us for your site.

Sources: MPOB TT No. 501 (2012) for the MPOB conventional blend and for MB nursery establishment on peat at 320 seedlings/ha; Tropical Forages (CSIRO, QAAFI, ILRI and CIAT, 2020 edition); PROSEA 4: Forages (1992); FAO, The Oil Palm (Better Farming Series); Chee and Ahmad Faiz (1991), ACIAR Proceedings No. 32. Rates assume good seedbed contact and adequate moisture; scarify or treat hard seed where germination testing indicates.

Mucuna bracteata is never broadcast. MB is raised in a polybag nursery and transplanted at about 320 seedlings per hectare, which needs only about 85 to 100 g of seed per hectare. Broadcast-style rates of 2 to 4 kg/ha are sometimes quoted for MB; those are wrong for this species by a factor of roughly 40 and lead to very large over-orders. If you have been quoted MB in kilograms per hectare, check the establishment method before you buy.

Total seed rate for a mixed legume cover crop stand

Most plantation growers sow a legume mixture rather than a single species, so that a fast pioneer gives early ground cover while shade-tolerant species persist as the canopy closes. There is no single universal total for such a mixture, and no institutional source claims there is. What exists is a well-bounded published range: roughly 5 to 15 kg/ha of total legume seed at plantation establishment, with most institutional and estate recommendations clustering at 6 to 12 kg/ha. The right figure within that band depends on the number of species in the blend, the establishment method, the soil, the terrain, and the germination of your seed lot.

The most widely cited standard is 8 kg/ha. The Malaysian Palm Oil Board specifies the conventional legume cover crop mixture as Pueraria javanica 4 kg/ha + Centrosema pubescens 3 kg/ha + Calopogonium caeruleum 1 kg/ha, a 4:3:1 split totalling 8 kg/ha, inoculated with 5 g Rhizobium (RRI strain) per kg of seed.

Source: MPOB TT No. 501, MPOB Information Series 588, June 2012 — Hasnol Othman, Farawahida Mohamad Darus and Zulkifli Hashim, "Best Management Practices for Oil Palm Cultivation on Peat: Mucuna bracteata as Ground Cover Crop", Table 1, treatment C2. Treat this as an institutional best-management-practice recommendation, not a primary field measurement. MPOB states 8 kg/ha as the rate conventional in the Malaysian oil palm industry and uses it as the control treatment in the trial, rather than reporting it as an experimentally optimised result.

Two limits on the MPOB figure. First, the trial is on deep peat at the MPOB Research Station, Teluk Intan, Perak, and we have found no MPOB publication stating a separate seeding rate for mineral soils; the 8 kg/ha should not be read as a mineral-soil recommendation. Second, TT No. 501 does not state whether its 8 kg/ha is expressed per gross hectare or per hectare of interrow area actually sown. For a plot-based trial specification gross area is the likelier reading, but the source does not say so, and the distinction matters (see below).

Published mixture totals, for comparison

Total Blend Source Type and context
4 to 6 kg/ha PJ + CP + CM, split not stated FAO, The Oil Palm (Better Farming Series) Institutional recommendation; smallholder oil palm
6.3 kg/ha PJ 3.6 + CM 1.6 + CP 0.5 + CC 0.6 Chee and Ahmad Faiz (1991), ACIAR Proceedings No. 32, pp. 32 to 35 Primary measurement: surveyed mean of five Malaysian rubber estates, sown in the interrows
6 to 9 kg/ha CC 1 to 1.5 + PJ 5 to 7.5 Tropical Forages (2020), Calopogonium caeruleum Institutional recommendation; stated as current practice for oil palm in Southeast Asia
8 kg/ha PJ 4 + CP 3 + CC 1 (4:3:1) MPOB TT No. 501 (2012), treatment C2 Institutional best-management-practice recommendation; oil palm on peat, Malaysia. MPOB's own term is "conventional LCC"
5 to 10 kg/ha calopo : centro : kudzu 5:4:1 PROSEA 4: Forages (1992), Pueraria phaseoloides Institutional compilation; rubber and oil palm, quoted per hectare of interrow area sown
10 to 15 kg/ha Four-species mixture PROSEA 4: Forages (1992), Calopogonium mucunoides Institutional compilation; plantation crops, Southeast Asia
12 to 15 kg/ha Four-species mixture Tropical Forages (2020), Calopogonium mucunoides Institutional compilation; tree plantations, Southeast Asia
15 kg/ha PJ 12 + CP 3 (4:1) Samedani et al. (2015), Int. J. Agric. Biol. 17(2): 251 to 260 Primary field experiment; oil palm, UPM Selangor, seed drilled rather than broadcast

PROSEA is internally inconsistent between its own species entries (5 to 10 kg/ha under Pueraria, 10 to 15 kg/ha under Calopogonium mucunoides). That inconsistency is itself evidence that no single correct number exists.

Where Mucuna bracteata carries part of the cover

The total seeded legume rate is contingent on what else is in the stand. Where Mucuna bracteata provides part of the ground cover, MPOB reduces the seeded mixture to Pueraria javanica 3 kg/ha + Centrosema pubescens 1 kg/ha = 4 kg/ha, alongside MB transplanted at 320 seedlings/ha (MPOB TT No. 501, treatment C4).

Why published seeding rates look contradictory

Three distinctions explain almost every apparent conflict between published figures. Conflating them is what produces the very low "mixture" numbers that circulate online.

1. A total is not a per-species component

PROSEA's "1 to 3 kg/ha of calopo" is calopo's share of a 10 to 15 kg/ha total, not a rate for the mixture. Tropical Forages says the same thing in one sentence: 1 to 3 kg/ha "in species mixtures of 12 to 15 kg legume seed". Quote either half on its own and you are out by roughly fivefold. Always check which of the two a figure is.

2. Interrow hectare is not gross hectare

Rates are often quoted per hectare of interrow area actually sown, not per gross planted hectare. PROSEA states "5 to 10 kg/ha in the inter-row areas", and the RRIM estate survey records legumes "planted in the interrows". Palm circles, harvest paths and frond stacks are not sown, so the sown interrow is typically only part of the gross area. The same job therefore reads as a higher number on an interrow basis than on a gross basis, which alone can explain a gap between two published figures.

3. Grazed pasture rates are not cover crop rates

Do not use pasture rates for cover cropping. Tropical Forages and Feedipedia give 0.5 to 1.0 kg/ha for Pueraria in grazed pasture mixtures sown with grasses. That is a forage figure for a completely different purpose, and it is roughly an order of magnitude below plantation establishment practice. It is frequently misquoted as a cover crop rate. It is not one.

Two further reasons rates legitimately differ: establishment method (drilled rows or dibbled pockets are standard estate practice and use less seed than broadcasting, which is generally a fallback), and stand purpose (broadcasting into an existing degraded smallholder stand to rehabilitate the ground cover is done at 1 to 2 kg/ha, far below any new-establishment rate).

Is there a Philippine seeding rate?

No Philippine institutional seeding rate exists. The Philippine Code of Good Agricultural Practices for Coconut (PNS/BAFS 238:2018, issued by the Philippine Coconut Authority and the Bureau of Agriculture and Fisheries Standards) recommends leguminous cover cropping but specifies no seeding rate. We have found no rate for legume cover crops from any Philippine institution, and none from any institution specifically for coconut. Every Philippine figure on this page, including ours, is therefore an extrapolation from Malaysian and wider Southeast Asian oil palm and rubber practice, not a Philippine recommendation. We would rather say that plainly than imply an authority that does not exist. Treat the published Malaysian figures as the transferable evidence base, and confirm against your own site conditions.

Seeding rate calculator

Estimate the seed quantity for your area. Choose a species or mixture and enter your area in hectares.

Enter an area to see the estimated seed quantity.

This is a planning estimate using the mid-point of each recommended range. The mixed-stand option uses 9 kg/ha, the mid-point of the 6 to 12 kg/ha cluster; the MPOB option uses MPOB's stated 8 kg/ha. Final quantity depends on seedbed condition, season, germination percentage, whether you are sowing a single species or a mixture, and whether your area is measured gross or as interrow only. Kudzu Seeds Trading confirms the exact rate for your site with every quote.

How to establish a cover crop in the Philippines

Good establishment matters more than the exact rate. The steps that growers across Mindanao and the Visayas rely on:

  1. Prepare the ground. Clear and lightly cultivate the inter-row, remove competing weeds, and create a firm, fine seedbed for good seed-to-soil contact.
  2. Time it to the rains. Sow at the onset of the wet season so seedlings get reliable moisture during the first four to six weeks.
  3. Treat hard seed. Pueraria, Centrosema, and Calopogonium have hard seed coats; scarify or use a brief hot-water treatment where germination tests show low emergence.
  4. Sow at the right rate. Sow evenly at the rate above, then lightly rake or roll to cover the seed shallowly. Drilled rows or dibbled pockets give better establishment than broadcasting.
  5. Transplant Mucuna bracteata. Raise MB in polybags in a nursery and transplant at about 320 seedlings/ha once seedlings are established, rather than broadcasting.
  6. Manage early competition. Spot-weed for the first two to three months until the cover closes, then let it suppress weeds on its own.

Legume cover crops fix atmospheric nitrogen and build soil organic matter, but the nitrogen contribution varies widely with site, species, age of the stand, and management. Verify against your own soil and leaf analysis rather than assuming a fixed fertiliser credit.

Frequently asked questions

What is the seeding rate for Pueraria javanica in the Philippines?
Pueraria javanica (PJ) is broadcast at 4 to 6 kg/ha as a single species. As the leading component of a legume mixture it is sown at 3 to 7.5 kg/ha, depending on the total rate and the blend. Ensure good seed-to-soil contact and sow at the start of the wet season.
What is the total seeding rate for a legume cover crop mixture?
There is no single universal figure. Published institutional recommendations for a mixed legume cover crop sown at plantation establishment fall in a band of roughly 5 to 15 kg/ha of total legume seed, clustering at 6 to 12 kg/ha. The best-cited figure is the Malaysian Palm Oil Board's conventional blend of Pueraria javanica 4 kg/ha plus Centrosema pubescens 3 kg/ha plus Calopogonium caeruleum 1 kg/ha, a 4:3:1 split totalling 8 kg/ha, inoculated with 5 g Rhizobium per kg of seed. This is MPOB's statement of conventional industry best practice rather than a measured optimum, and it comes from a trial on peat.
How much Mucuna bracteata seed do I need per hectare?
Mucuna bracteata is not broadcast. It is raised in a polybag nursery and transplanted at about 320 seedlings per hectare, which needs roughly 85 to 100 g of seed per hectare. This is far less seed than a broadcast species because each seedling is raised individually and planted out. Rates of 2 to 4 kg/ha that circulate for MB are broadcast-style figures and are wrong for this species by a factor of roughly 40.
Why are these single-species rates lower than the 10 kg/ha I see elsewhere?
The 10 kg/ha figure quoted on many sites is inflated for a single species. Reconciled against MPOB, PROSEA, and Tropical Forages, single-species rates of 4 to 6 kg/ha for PJ and CM and 3 to 4.5 kg/ha for CP and CC are sufficient for full ground cover under good establishment conditions. Over-seeding raises cost without improving establishment. Note that a multi-species mixture is a different question and legitimately totals more, at roughly 5 to 15 kg/ha.
What is a good cover crop mixture for oil palm or rubber?
Use the Malaysian Palm Oil Board conventional blend: Pueraria javanica 4 kg/ha, Centrosema pubescens 3 kg/ha and Calopogonium caeruleum 1 kg/ha, a 4:3:1 split totalling 8 kg/ha. It is the best-cited published figure for Malaysian oil palm and it combines a vigorous pioneer with two shade-tolerant persistent species. Equal-parts blends are sometimes quoted, but no institutional source recommends one: every published mixture is Pueraria-dominant.
Is there an official Philippine seeding rate for cover crops?
No. The Philippine Code of Good Agricultural Practices for Coconut, PNS/BAFS 238:2018, recommends leguminous cover cropping but specifies no seeding rate, and we have found no rate from any other Philippine institution. Every Philippine figure, including ours, is an extrapolation from Malaysian and wider Southeast Asian oil palm and rubber practice.
When should I sow cover crops in the Philippines?
Sow at the onset of the wet season so seedlings have reliable moisture during the critical first four to six weeks. In areas with two wet peaks, the earlier, more dependable rains are usually the safer window.
Do you provide seeding-rate guidance with an order?
Yes. Kudzu Seeds Trading provides species-specific seeding rates and establishment guidance tailored to your crop, region, and soil with every quote. Contact us with your area and crop and we will confirm the exact rate and seed quantity.
Request a Seed Quote and Rate Plan

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