Refining irrigation and fertigation practices

Craigmore has two trials on kiwifruit properties in Northland to increase irrigation efficiency, optimise nutrient application, and reduce resource consumption.

The soil and moisture management project commenced with a thorough soil mapping initiative across Wiroa orchard. This comprehensive mapping provided crucial insights into the depth
of topsoil and identified soil layers which could hinder root development. Using this data, the Wiroa team was able to install advanced soil moisture measurement devices at two key depths: 0-300mm and 300-800mm. These sensors deliver real-time moisture data, offering precise control over irrigation practices.

Prior to this project, Wiroa followed a conventional irrigation method, typically running for a duration of three hours. This approach often resulted in water bypassing the root zone and draining out of the bottom of the soil profile. By irrigating for just one hour, up to three times a day, they managed to apply water more effectively within the root zone. This adjustment not only prevented water wastage but also improved lateral water movement, fostering a larger and healthier rooting area.

With the improved irrigation system, Wiroa gained greater confidence in its fertigation practices.

The ability to apply water precisely where needed allowed for more effective delivery of nutrients. This resulted in better plant growth and health,
as the plants received the full benefit of the applied fertilisers. Additionally, the installation of a permanent fertigation system at Wiroa ensured consistent and
efficient nutrient application, further contributing to overall operational efficiency.

Overall, these changes have contributed to a more sustainable and cost-effective operation. Shorter irrigation duration led to a notable decrease in water
usage, which in turn, lowered electricity consumption and water charges. In addition, less fertiliser has been required due to leaching of nutrients.

Since this trial, the number of moisture probes at Wiroa has been increased from five to 11 to further refine water management practices. The property
is also investing in a permanent fertigation system to ensure ongoing effectiveness in nutrient delivery. Encouraged by the success of these improvements,
these innovations are being implemented on Kiwinorth orchards for the coming year.

Beyond irrigation and fertigation, Wiroa is committed to broader sustainability initiatives. These include working towards carbon neutrality, exploring
alternative products to Hi-Cane, and completing a biodiversity study.