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The University of Granada spin off comÂpany MISUR has patented a subÂstrate for mushÂroom growth made from olive oil waste known as alpeÂrujo, which is marÂketed as a ferÂtilÂizer conÂtainÂing mushÂrooms. The prodÂuct has advanÂtages such as high nitroÂgen conÂtent for increased proÂducÂtion and natÂural fungiÂcides for resisÂtance against funÂgal infecÂtions, and is curÂrently being marÂketed in Andalucia, Spain.
Yet another potenÂtial use for olive oil proÂcessÂing waste has recently been patented by the University of Granada spin off comÂpany MISUR, which has develÂoped a subÂstrate for mushÂroom growth based on the olive oil waste prodÂuct known as alpeÂrujo — or pomace.
The prodÂuct, obtained from one of the residues left over after the crushÂing and extracÂtion of olive oil in mills, is marÂketed by the comÂpany as a ferÂtilÂizer in bags which also conÂtain mushÂrooms.
As a subÂstrate for the growth of mushÂrooms, the prodÂuct has a numÂber of advanÂtages, apart from being an enviÂronÂmenÂtally friendly way to utiÂlize the many tons of waste from the olive oil proÂducÂtion process that are proÂduced every year.
Benefits of the new subÂstrate include higher proÂducÂtion as a result of the high nitroÂgen conÂtent of the alpeÂrujo, which acts as a nutriÂent for the mushÂrooms, as well as the presÂence of polypheÂnols that act as natÂural fungiÂcides that give resisÂtance against funÂgal infecÂtions. Research in Argentina has also supÂported the techÂnique, showÂing the addiÂtion of olive oil waste prodÂucts to maize- and garÂlic-based subÂstrates was benÂeÂfiÂcial for mushÂroom growth.
The new prodÂuct is a folÂlow on from preÂviÂous organic subÂstrates for mushÂroom growth proÂduced by MISUR, a comÂpany that focuses on the utiÂlizaÂtion of agriÂculÂtural wastes such as cereal straw with acidÂity regÂuÂlaÂtors, nutriÂents and fungi seeds, which are known as mycelia. The addiÂtion of the olive oil byprodÂuct to these types of subÂstrates proÂvides extra mateÂrÂial for the fungi to degrade and use as ferÂtilÂizer for growth.
The Spanish comÂpany is curÂrently focusÂing on the comÂmon mushÂroom and shiÂitake variÂeties, the latÂter of which has a high gasÂtroÂnomic value in Spain despite its Asian oriÂgins, and is the first comÂpany to proÂduce organic subÂstrates for both species.
Using olive oil waste as a subÂstrate for mushÂrooms has preÂviÂously been seen as an effecÂtive techÂnique to neuÂtralÂize the polÂluÂtant effect of olive oil waste that is proÂduced in such large amounts throughÂout the Mediterranean region. However, it has not been sucÂcessÂfully marÂketed for the growth of ediÂble funÂgus before now.
MISUR prodÂucts are curÂrently being marÂketed throughÂout the region of Andalucia in southÂern Spain.