"With the cost of nitrogen fertiliser continuing to rise, growers and farmers have to look for ways to manage soil nutrients more effectively," said a spokesperson.
Garden Organic, formerly the Henry Doubleday Research Association, said it had carried out 15 years of research into a range of growing systems.
"We are running a set of workshops with expert researchers and agronomists to answer many of the questions people have asked."
Growers will learn how careful budgeting could be used to make best use of nutrients and what the best green manures are for certain situations.
Experts will look at how much nitrogen a green manure released, the best way to make nitrogen available to crops and how to stop nitrogen being lost from farming systems.
"We will also look at what are the likely future environmental and financial implications of using green manures."
The first workshop, called "How to manage green manures to benefit your soil", will be held in Warwickshire on 21 July. The second, "Green manures and nutrient management", runs in Warwickshire on 2 August, Shropshire on 3 August, and Herefordshire on 4 August.
- Events cost £20 each.Workshops are funded by Landskills West Midlands, managed by Lantra for Advantage West Midlands as part of Defra's Rural Development Programme. Contact Anton Rosenfeld, tel: 02476 217738, email@example.com