Case Studies
Using Recycled Gypsum to Improve Growing Condition
Brief
To evaluate the addition of recycled gypsum from waste plasterboard in improving soil structure and efficiency of uptake of nutrients and minerals by cereal and root crops on commercial arable farms.
Solution
Background
Adding gypsum to soil is a traditional way of improving its condition. This improves soil structure leading to better drainage during the winter, and a wider weather window for establishing, maintaining and harvesting the crop. It also improves water-holding capacity during the summer, which reduces hardness and cracking from compacted and baked soils so benefiting growth.
There are also indications that the incorporation of gypsum may additionally help plant growth through improved uptake efficiency of inorganic inputs and restoration of calcium and sulphur deficiencies. At present, crop nutrition within the UK is primarily achieved through the use of inorganic fertilisers, and there would be both financial and environmental benefits from exploring opportunities which make more efficient use of such inputs.
Gypsum used in agriculture is usually mined, depleting natural resources. This study was undertaken to determine whether recycled gypsum from waste plasterboard could be used as a viable alternative. The study is based around two field trials: one on potatoes and one on winter wheat.
Potato trial
This trial was undertaken between February and November 2006. The field was divided into trial plots - some left untreated, some treated with agricultural gypsum, and some treated with recycled gypsum. Varying application rates of gypsum and fertiliser were used to compare different treatments.
The overall quality of the potatoes grown with recycled gypsum was higher than those in the untreated soil.
- Growth cracks were significantly reduced in occurrence and size; and
- Skin finish and bloom appeared much improved, leading to a brighter and more marketable product.
As a result, growers may be able to achieve a higher premium for the potato crop, especially those targeting the pre-pack market.
Other benefits were also found.
A summary leaflet about the trial, as well as the full technical report are available below.
Wheat trial
Winter wheat is the major combinable crop produced by arable farmers in the UK, and so has the greatest market potential should the trials prove that the use of recycled gypsum is successful.
Testimonial
knorman@velcourt.co.uk dave.marsh@wrap.gov.uk
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