Agroforestry for growersCategory: News
12 October 2017
Workshop report: 19th September 2017 - Tolhurst Organics, Whitchurch on Thames, Berkshire
Integrating trees into horticultural systems offers opportunities to diversify the business as well as realise environmental benefits. This workshop at Tolhurst Organic focused on providing practical advice and pointers on how to successfully implement an agroforestry system on your farm as well as an opportunity to learn directly from Ian Tolhurst’s (Tolly) experiences.
The day centred around Tolly’s recently planted agroforestry system which has been integrated into his organic vegetable production system. Established in 2015, six single tree rows, a mixture of trees for fruit, timber and coppice products, have been planted with 20m wide cropping alleys in between. You can read more about Tolly’s agroforestry system and ORC’s research on the system here.
The day started with introductions and an overview of the day, then we all headed out for a guided tour. The tour concentrated on the pros and cons of planting trees for agroforestry in horticultural businesses. Tolly talked us through his field scale veg rotation and how agroforestry and trees in general fit into his system. We started by hearing about Tolly’s homemade woodchip compost and then were shown a new trial where Tolly has applied green uncomposted (ramial) woodchip, sourced from his boundary hedge, onto his green manure. Working with the Organic Research Centre he is monitoring performance of the ramial chip alongside his normal fertility building treatment of composted woodchip applied to the green manure.
We then crossed over the road into the agroforestry field with discussions on species choice and design; tree establishment; understorey management; the economics of planting and managing trees. Different approaches to understorey management have been trialled including daffodils, rhubarb, cut flowers and globe artichokes. The intention was to make more efficient use of all available land and reduce the impact to the business felt through loss of cropping area. However, the understorey crops have been a mixed bag; the daffodils and cut flowers have been reasonably successful with production increasing year on year, but both the rhubarb and the artichokes have succumbed to verticillium wilt and need replanting. The value of the understorey to biodiversity was discussed and some of the initial findings from the research presented, the plant species richness of all the tree rows has increased year on year, providing an important resource for pollinators and pest predators. Tolly talked through the practicalities of establishment and lessons he had learnt, for example he had not considered the impact that tree rows would have on his ability to move crop covers around the field. Luke from the Woodland Trust gave an overview of the grants and support that are currently available to cover the costs of tree planting, including the Woodland Trust’s partnership scheme with Accor hotels which is designed specifically for agroforestry plantings and helped to fund Tolly’s new tree planting. He also talked about the importance of tree protection in the first few years.
After lunch Niels Corfield led the group through a thought-provoking design workshop where we were asked to consider some hypothetical scenarios for windbreak creation on a market garden, considering both crop protection, aesthetics and practicalities.
The day concluded with a short workshop to introduce the new UK Agroforestry Network and the trees and horticulture group. Workshop participants were asked to help us decide on the focus of the group and to think about:
- Where information is lacking
- Where it would help to get together and discuss specific subjects
- Where we should prioritise collation and dissemination of existing knowledge
The main areas identified in the workshop were:
- Identification of local networks and partnership opportunities. Help developing a network of local sites/ case studies to learn from and share experiences
- A need for more information on the annual benefits of tree planting in terms of savings (cumulative from day one) and economic case studies (cost of establishment, labour and likely returns)
- More information on the realities of growing timber in proximity of crops and the interactions between trees and vegetables
- Help accessing and information on grants and funding sources: opportunities to share costs e.g. for specialised machinery