Onion Trial: Improved Quality With Reduced Inputs
Summary.
Results from an onion trial using DCT products showed that bulb size was maintained without increasing fertiliser inputs. At the same time, skin firmness and overall quality improved, root systems grew deeper, and weed control required less herbicide.
The Problem.
Onion crops often require high fertiliser and herbicide inputs to achieve size and quality. Poor soil structure, limited root development, and nutrient inefficiencies can result in nutrients going into stem growth rather than bulb development, while also increasing weed pressure.
The Result.
The onion trial delivered multiple positive outcomes:
Bulb size maintained — indicating less, or no additional, fertiliser was required
Firmer onion skin and improved quality compared to previous crops in the same paddock
Stronger root growth growing downward, directing nutrients into the bulb rather than the stem
Reduced herbicide requirement to manage weeds
How DCT Products Support Onion Growth and Quality.
✔ Improving soil structure
Compounds in DCT products help bind soil particles into stable aggregates, creating an open, well-aerated soil that allows onion roots to penetrate deeper and access moisture and nutrients.
✔ Enhancing nutrient availability
Key minerals are chelated and kept plant-available, allowing the crop to efficiently absorb what it needs and reducing reliance on added fertiliser.
✔ Supporting soil biology
Healthy microbial populations improve nutrient cycling and compete with weed seeds, helping reduce weed pressure naturally.
✔ Optimising root and bulb growth
With improved access to nutrients and water — and less stress from compaction or weeds — roots grow downward, feeding the bulb rather than the stem. This supports firmer skin and better overall onion quality.
Translating Soil Improvements Into Crop Outcomes.
The combined improvements in soil structure, nutrient cycling, and root development resulted in onions that:
Maintain bulb size without extra fertiliser
Develop firmer skin and improved quality
Require less herbicide for weed control
Conclusion.
This onion trial demonstrates how improving soil function can translate directly into better crop quality and reduced input requirements — supporting both productivity and profitability.
