Cover Crops and Soil Programs for Philippine Durian
Kudzu Seeds Trading supplies tropical legume cover crops and SoilBoost EA humic acid soil conditioner to durian orchards across the Davao region, the durian capital of the Philippines. Soil organic matter, microbial activity, and orchard-floor moisture all influence how a durian orchard performs, and a well-designed orchard-floor programme supports the deep, acid-loving root system the tree depends on.
At a glance
- PH role: The Davao region is the durian capital of the Philippines and the country's main commercial durian-producing region.
- Tree profile: Durian is acid-loving and deep-rooted; orchard-floor soil organic matter and microbial activity support root health.
- Why cover crops: Orchard-floor legume cover holds topsoil on Davao slopes, suppresses weeds in the inter-canopy zone, and adds biological nitrogen and biomass under the tree drip line.
- Why SoilBoost EA: Humic acid soil conditioner pairs naturally with cover-crop establishment on orchard floors to support soil biology and humic substance levels.
- Primary species: Centrosema pubescens (CP) and Calopogonium caeruleum (CC) for shade-tolerant orchard-floor cover; Pueraria javanica (PJ) on younger, more open blocks.
Important note on disease. SoilBoost EA and our cover crops are not fungicides or pesticides. They support soil health, which is one factor among many in plant disease resilience. They are not a treatment for Phytophthora root rot, stem canker, or any other specific plant disease. For Phytophthora management on a durian orchard, follow guidance from the Bureau of Plant Industry (BPI), your local agronomist and a qualified plant pathologist.
Why orchard-floor programmes matter for durian in the Philippines
Philippine durian production is heavily concentrated in the Davao region: Davao del Sur, Davao del Norte, Davao de Oro, Davao Oriental, and Davao Occidental. The volcanic-influenced soils on the foothills of Mount Apo are well-drained and biologically active, but continuous cropping, weed control with broadcast herbicides, and slope erosion all gradually reduce organic matter under the canopy. A durian tree takes several years to first fruit and remains productive for decades; orchard-floor management compounds over that long horizon.
The orchard-floor objectives for durian are:
- Maintain soil organic matter in the inter-canopy zone and along the drip line.
- Hold topsoil on the rolling Davao terrain where most commercial orchards sit.
- Support a biologically active root zone (microbial diversity, humic substances).
- Reduce weed-control workload and herbicide pressure between trees.
Legume cover and SoilBoost EA together address those four objectives. Cover crops supply ground cover and biological nitrogen; SoilBoost EA supplies humic acid that supports soil biology and nutrient cycling.
Recommended species for Philippine durian orchards
Centrosema pubescens (CP)
The primary durian orchard-floor choice. Broadcast 3 to 5 kg per hectare (Tropical Forages). Shade-tolerant, persistent under mature canopy, supplies steady organic matter and biological nitrogen along the drip line.
Primary / 3 to 5 kg/ha (Tropical Forages) / shade-tolerant
Calopogonium caeruleum (CC)
Tropical Forages gives 1 to 1.5 kg/ha sown with 5 to 7.5 kg/ha PJ. Climbing legume that complements CP under shade; useful on the steeper edges of orchards and along orchard roads.
Shade-tolerant / 1 to 1.5 kg/ha with PJ (Tropical Forages)
Pueraria javanica (PJ)
Broadcast; Tropical Forages gives about 4 kg/ha sown alone. Best on younger orchards before canopy closure, when open-light conditions still favour PJ. Switch to CP and CC as the canopy closes.
Young orchards / about 4 kg/ha (Tropical Forages)
Calopogonium mucunoides (CM)
Broadcast; the seeding rate is set on the quotation for your site. Pioneer for replanted or newly opened orchard blocks on acidic Davao Ultisols.
Replant pioneer / rate on quotation
Mucuna bracteata (MB)
Used selectively on new or replant blocks where heavy biomass and erosion protection are needed before the durian canopy develops. Not broadcast. Established from nursery-raised seedlings: MPOB TT No. 501 (Hasnol Othman, Farawahida Mohamad Darus and Zulkifli Hashim, 2012) used about 320 seedlings per hectare, two per palm point, raised from about 500 seeds (75 g); Samedani et al. (2015) used 680 seedlings per hectare. For MB nitrogen, one 15N isotope-dilution study under three-year-old oil palm on Jawa Series soil in Malaysia measured roughly 67 to 84 percent of its nitrogen derived from the atmosphere (Ndfa) (Cheah et al. 2010); the absolute contribution depends on biomass, age and site. Legume cover contributes nitrogen; adjust your fertiliser programme only after soil and leaf analysis shows what the cover supplies on your block.
Establishment / transplanted, not broadcast
SoilBoost EA
Humic soil conditioner, leonardite-derived, with about 0.45 percent sulphur and pH 3.84. Broadcast 50 to 100 kg/ha across the orchard floor, or drench 10 to 15 kg/ha around each tree along the drip line. Supports soil biology, humic substance levels, and root-zone nutrient cycling. It is a soil conditioner, not a fertiliser, and not a substitute for one. Not a fungicide or pesticide. Manufactured exclusively for Chemiseed Sdn. Bhd. and Kudzu Seeds Trading.
Amendment / supports soil biology
PH-specific establishment timing
The Davao region runs PAGASA Climate Type IV (rain year-round, no pronounced dry season). The typical durian flowering cycle peaks in March to May with main harvest in August to October. Match orchard-floor work to off-peak windows in the tree's reproductive cycle.
- Cover-crop establishment: establish CP, CC, or PJ at the early-rain onset in April to May for orchards in Davao del Sur and Davao del Norte. For Davao Oriental (wetter year-round), establish during a spell of settled, clearer weather.
- SoilBoost EA application: broadcast or drench after main harvest (September to November), before the next flowering cycle; a second application can be made before flowering.
- New or replant blocks: establish MB seedlings or PJ broadcast at the first sustained rains of the season; switch to CP and CC as the durian canopy approaches closure.
The Davao region is south of the main Philippine typhoon belt but exposed to high-rainfall convective events during the southwest monsoon. A well-rooted orchard-floor legume cover holds topsoil during these events.
Common challenges in Philippine durian
- Root-zone health on long-cycle trees. Durian is deep-rooted and acid-loving; orchard-floor legume cover plus SoilBoost EA support soil organic matter and microbial activity over the tree's decades-long productive life.
- Slope erosion on Mount Apo foothills. Persistent shade-tolerant cover (CP, CC) is the primary mitigation.
- Phytophthora context. Phytophthora root rot and stem canker are major concerns in Philippine durian. Cover crops and SoilBoost EA support soil biology and organic matter, which is one factor among many in overall plant resilience. They are not a treatment for any disease and do not substitute for guidance from BPI, your local agronomist and a plant pathologist.
- Herbicide-pressure reduction. A live orchard-floor cover reduces the weed-control workload and herbicide load on the orchard.
- Drip-line organic matter loss. Repeated weeding, especially under the drip line, slowly degrades organic matter. SoilBoost EA application around the drip line supports humic substance levels.
Frequently asked questions
Which cover crop is best on a Philippine durian orchard floor?
Centrosema pubescens (CP), broadcast at 3 to 5 kg/ha (Tropical Forages), is the primary orchard-floor choice for mature durian. It is shade-tolerant and persistent, so it carries the legume cover role under the closed canopy. Calopogonium caeruleum (CC), sown at 1 to 1.5 kg/ha with 5 to 7.5 kg/ha PJ (Tropical Forages), complements CP on shaded blocks and steeper orchard edges. On younger orchards before canopy closure, Pueraria javanica (PJ) is the better starter; Tropical Forages gives about 4 kg/ha sown alone.
How much Mucuna bracteata seed do I need per hectare?
Far less than the other species, because Mucuna bracteata is not broadcast. It is raised in a nursery and transplanted. MPOB TT No. 501 (Hasnol Othman, Farawahida Mohamad Darus and Zulkifli Hashim, 2012) used about 320 seedlings per hectare, two per palm point, raised from about 500 seeds (75 g); Samedani et al. (2015) used 680 seedlings per hectare. Check that any quotation you receive is written for the transplanting method and not for broadcasting.
Will SoilBoost EA or cover crops help with Phytophthora?
SoilBoost EA and our cover crops are not fungicides or pesticides. They support soil health, which is one factor among many in plant disease resilience. They are not a treatment for Phytophthora root rot, stem canker, or any other specific plant disease. For Phytophthora management on a durian orchard, follow guidance from the Bureau of Plant Industry (BPI), your local agronomist and a qualified plant pathologist. Treat cover crops and soil amendments as part of overall orchard-floor management, not as a disease response.
How should I apply SoilBoost EA on a durian orchard?
SoilBoost EA is a humic soil conditioner (leonardite-derived, with about 0.45 percent sulphur and pH 3.84). Broadcast 50 to 100 kg/ha across the orchard floor, or drench 10 to 15 kg/ha around each tree along the drip line. Typical timing is after main harvest (September to November), with a second application before flowering. It is a soil conditioner rather than a fertiliser and is not a substitute for one; it supports soil biology alongside your normal fertiliser programme and the legume cover. Manufactured exclusively for Chemiseed Sdn. Bhd. and Kudzu Seeds Trading.
Can I cut back on nitrogen fertiliser once the legume cover is established?
A well-established legume cover does add biologically fixed nitrogen to the orchard floor, but how much of it becomes available to the tree, and when, depends on biomass, decomposition rate, soil type, and rainfall. Legume cover contributes nitrogen; adjust your fertiliser programme only after soil and leaf analysis shows what the cover supplies on your block.
Will cover crops compete with durian for water or nutrients?
They can. A legume cover acts as a living mulch and returns nitrogen and organic matter through litter, but it also uses water and nutrients and can compete with the trees, particularly young trees. Keep the area around the trunk of young durian clear, cut the cover back in long dry spells, and check soil moisture and leaf analysis on your own blocks.
Do you deliver to Davao durian orchards?
Yes. Kudzu Seeds Trading is based in Davao City and dispatches across the Davao durian belt: Davao del Sur, Davao del Norte, Davao de Oro, Davao Oriental, and Davao Occidental. Export shipments carry a phytosanitary certificate issued by the Bureau of Plant Industry (BPI); delivery timing and any documents for inter-island shipments are confirmed on the quotation.
Related pages
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Disclaimer. Cover crops are not a disease treatment. SoilBoost EA is a soil conditioner. It is not a fungicide, pesticide, plant protection product, or standalone treatment for Fusarium TR4, Phytophthora, or any crop disease. It may support soil structure and root-zone conditions as part of a broader agronomy program, but disease management must follow local agronomist, regulatory, sanitation, drainage, and resistant-variety guidance.
Kudzu Seeds Trading is the Philippines-based sister company of Chemiseed Sdn. Bhd. in Malaysia (chemiseed.com). SoilBoost EA is manufactured exclusively for Chemiseed Sdn. Bhd. and Kudzu Seeds Trading.
Sources for the seeding and nitrogen figures: Tropical Forages, CIAT and ILRI (2020), tropicalforages.info; MPOB TT No. 501 (Hasnol Othman, Farawahida Mohamad Darus and Zulkifli Hashim, 2012); Samedani et al. (2015), International Journal of Agriculture and Biology 17(2): 251-260; Cheah, Zaharah and Aminuddin (2010), Oil Palm Bulletin 60: 22-27.
Last reviewed 10 October 2026.