Can Digestat Be Spread on Leased Land without the Agreement of the Lessor?

Having retired three years ago, I have rented my 30 hectares of land to a farmer who is associated with a Gaec. I have learned that this Gaec has a methanization project. I have doubts about the benefits of the digestates resulting from this activity in replacement of the manure currently used. I fear the deterioration of the quality of my land in a few years. What is the duty of a farmer to his owner not having been informed directly by my tena…