BiONERS Pengetahuan

Why Metabolic Agriculture?

• Rising fertilizer and pesticide costs squeeze farm profitability
• Inefficient nutrient use and disrupted nutrient cycles
• Pest, disease, and resistance pressure (canker, Phytophthora, root rot, borers)
• Declining soil health — loss of organic matter and microbial life
• Climate variability and abiotic stress affecting fruit set
• Low nutrient-use efficiency (NUE) through leaching and fixation
• Environmental degradation from runoff, acidification, and pollution

Durian: a high-value, high-input crop

• Long juvenile phase and irregular flowering
• High energy and mineral demand during flowering and fruit filling
• Sensitive to nutrient imbalance and soil health decline
• Premium quality depends on tree metabolism — not just input levels

The metabolic framework

A continuous cycle supporting durian success — built on healthy soil, roots, and tree physiology.

• Capture — Efficient photosynthesis — CO₂ + light + H₂O → sugars + O₂
• Convert — Energy (ATP) and metabolic activation — sugars → ATP
• Build — Cell division and structure — calcium powers division and strong cell walls
• Protect — Strengthen defenses — strong cells and antioxidant enzymes reduce oxidative stress
• Reproduce — Reproductive growth — flowering, fruit set, and quality yield

Key principles in durian

• Carbon & oxygen capture — Maximize leaf health and canopy structure; ensure root respiration
• Energy efficiency — Adequate carbohydrates for ATP; reduce stress to limit energy wastage
• Calcium-centred cellular health — Essential for cell division, wall strength, and membrane stability
• Nutrient balance & metabolism — Focus on C:N and A:N ratios; use non-ionized minerals (CaCO₃, S°, ZnO) and beneficial microbes
• Natural resilience — Balanced metabolism enhances antioxidant defense and stress tolerance

Expected outcomes

• Higher yield and fruit quality
• Lower input cost and disease incidence
• Improved tree health and longevity
• Greater sustainability and profit potential

Research focus areas

• Optimizing C:N and A:N ratios
• Role of non-ionized minerals (NIMs) such as CaCO₃, S°, ZnO
• Calcium nutrition and transport
• Oxygen availability and root health
• Energy metabolism and the sugar–ATP relationship
• Metabolic efficiency, stress tolerance, and disease resistance
• Field validation across soils and climates

What is AICC?

A condition where excessive ammonium (NH₄⁺) and ammonia (NH₃) accumulation disrupts cellular balance, weakening the durian tree and making it highly susceptible to canker and pests.

How AICC happens

• 1 — Excess ammonium fertilization or accumulation in soil
• 2 — Lack of oxygen slows nitrification
• 3 — NH₄⁺ builds up in the rhizosphere
• 4 — Roots take up NH₄⁺ faster than the plant can assimilate
• 5 — Carbon (energy) becomes limiting
• 6 — Ion imbalance, pH changes, and toxicity occur
• 7 — Membrane integrity weakens
• 8 — Oxidative stress increases
• 9 — Cellular collapse and tissue damage — pests and pathogens invade

Environmental triggers

• High temp & dry conditions — Soil dries, NH₄⁺ concentrates, pH rises, and NH₄ converts to NH₃ gas
• NH₃ burst (volatilization) — Sudden ammonia release damages leaves, burns roots, and harms soil biology
• Lack of oxygen — In poorly aerated soil, nitrification stops, roots suffocate, and ATP drops

Aerobic vs anaerobic soil

• Aerobic (healthy) — Organic N → ammonium → nitrite → nitrate → plant uptake — strong roots and healthy trees
• Anaerobic (unhealthy) — Ammonium accumulates, converts to ammonia gas, or is lost via denitrification — root stress and cell damage

Pest & disease vulnerability

• Canker — NH₄⁺ stress weakens bark cells → dieback and trunk canker
• Durian psyllid — Thrives on soft, nitrogen-rich flush → discolored leaves, reduced growth
• Scale insects — Lush, juicy tissues from high NH₄⁺ → sooty mold and yield loss
• Green hoppers — Prefer high-N soft tissues → yellow leaves and stunted growth
• Borers — Reduced resin/phenolics (tree defenses) → tunneling and tree decline

Prevention checklist

• Use nitrate-dominant nitrogen sources
• Avoid excessive ammonium fertilizers
• Improve soil aeration and drainage
• Maintain soil pH between 5.5 and 6.5
• Increase organic matter and microbial activity
• Provide sufficient K, Ca, Mg, and trace elements
• Use biochar and beneficial microbes
• Mulch to maintain moisture