KWAZULU-NATAL — For agricultural producers, the foundation of a profitable harvest lies beneath the surface. Achieving optimal macadamia crop yields increasingly depends on prioritizing soil health, a reality recently highlighted by a KwaZulu-Natal farmer’s transformative experience with 9Five Revive and BioBrix. By shifting away from traditional salt-based fertilizers and focusing on long-term carbon restoration, growers are seeing rapid, measurable improvements in orchard vitality, pest resistance, and nutrient efficiency.
Guy, a macadamia farmer who previously spent 80 years in sugarcane production, currently manages 125 hectares of planted macadamias, with 90 to 92 hectares fully operational. His farm is situated in a high-rainfall coastal area of Natal, characterized by sandy, marginal soils with clay pockets. When Johan and Jayden from BioBrix first visited the property, soil tests revealed a carbon content hovering at a mere 2 percent.
The farm’s environmental conditions presented compounding challenges. High rainfall exacerbated severe nutrient leaching from conventional salt-based granular fertilizers. Guy noted that previous tissue and soil tests revealed his trees were in a “minus” deficit for essential nutrients like nitrogen, despite fertilizer applications. Furthermore, stagnant water buildup in the marginal soils made the orchards highly susceptible to Phytophthora root rot. Guy also observed that salt-based applications actively degrade existing soil carbon, comparing the effect to throwing salt on a wound to kill beneficial bacteria.
Now in his second year of working with Johan, Jayden, and the 9Five and BioBrix programs, Guy has observed significant and rapid improvements in overall orchard health. The physical transformation of the soil structure is immediately evident. Previously, the ground was so compacted and impermeable that a soil probe would not penetrate the earth even when jumped on. Today, a simple stick can be pushed deep into the soil with one hand, demonstrating enhanced organic matter breakdown and superior water penetration.
This revitalized soil biology has directly translated to reduced pest and disease pressure. Guy reported a massive reduction in thrips damage, which was previously a major operational headache. Thrips typically scrape the raceme seam of the macadamia flower with a plow-like mouthpiece, causing the tissue to turn brown and excrete sap. This season, the raceme centers remained vibrantly green, and early-formed nuts showed absolutely no thrips damage. As a result, Guy did not spray for thrips at all this year. Additionally, because the flowers were in such exceptional condition, he required only a single round of fungicide spray.
The improved soil environment has also maximized fertilization efficiency, as the restored carbon matrix holds and delivers nutrients effectively rather than allowing them to wash away. A standout observation is the robust flowering extending all the way to the base of the trees. This includes the ‘816’ macadamia variety, which is traditionally renowned as a poor, exterior-only flowerer that struggles in shaded interior conditions.
The emphasis on holistic tree nutrition is strongly echoed by fellow macadamia producer Wally. Managing 80 hectares of macadamias, Wally recently achieved an impressive 321 tons of dry-in-shell macadamias, averaging 4.5 tons per hectare, with a 1 percent unsigned crackout. By avoiding chemical overspray and focusing heavily on organic soil management, Wally attributes his high tonnage to a simple principle: ensuring the trees are healthy, dark-colored, and flushing nicely. If a tree lacks strength and proper nutrition, it cannot produce a viable crop.
The overarching lesson from these operations is that addressing every component of soil health creates a compounding, long-term benefit, rather than a temporary one-year shock response. As Guy summarizes, the formula for modern, sustainable farming is straightforward: happy soil leads to a happy tree, which ultimately results in a happy bank balance and a happy farmer.
Farmers interested in replicating these soil health results and optimizing their macadamia crop nutrition can explore more information about 9Five products and request personalized recommendations from the BioBrix team through their official channels.
