Research project Using flower mixtures as a win-win situation for biodiversity and grower at open field tree nursery

General introduction

The Flower4Trees project convincingly demonstrates that flower mixtures are a valuable strategy to enhance biodiversity in the Flemish tree nursery sector, without compromising cultivation quality. Essential here are a well-considered choice of flower species and context-oriented application. These elements largely determine a later successful roll-out in the field. The Flemish tree nursery sector covers about 4000 ha of open field and, with 1400-1700 ha, offers a lot of potential for biodiversity-strengthening measures. This project investigated how flower mixtures can be used functionally in two situations, on the one hand between two growing cycles as an alternative to classic green manures and on the other hand between planted tree rows during cultivation. The main challenge was to develop one or more flower mixtures that promote biodiversity, support natural pest control, improve soil quality while not having a negative impact on the main crop. The knowledge gained within the project offers potential to convince the wider sector of the use of flower mixtures.

Research approach

The project brought together the expertise of tree growers and researchers. The basic idea was that the flower mixtures recommended for field borders were not adapted to the requirements of the tree growers to guarantee the quality of the soil and their crops. These growers were looking for mixtures that prove their services in terms of biodiversity and also meet the necessary quality requirements (impact on crop growth, weed pressure, soil moisture and nematode pressure). Through experiments and knowledge gathering, they arrived at a series of ready-made flower mixtures suitable for use in the two case studies.

Relevance/Valorization

The project offers a promising perspective for wider roll-out within the sector. At the same time, it highlights the need for further research into the long-term effects on soil life and ecosystem services in order to achieve a sustainable integrated approach. To support implementation, a practical online flyer has been developed. It is available via the websites of HOGENT and Viaverda. The flyer contains concrete guidelines for the establishment and maintenance of flower strips, complemented by information on the properties of the species used and their added value - both for biodiversity and for the grower.

Financing

Vlaamse Overheid Departement L&V