| Summary: | The Woodnat project (H2020) has the goal of identifying the problems that led to poor yields in walnut plantations established under the financial support of EU 2080/92 Regulation and Rural Development Programme, and of improving the market demand for smaller assortments. Some of the plantations monitored in the framework of the project needed thinning: one, an experimental stand with 5 plots with different layouts and species established in 1994, was thinned in spring 2018; in a second one, a polycyclic plantation established in 1996 with common walnut, hybrid poplar and nurse trees, the walnut was thinned in spring 2017. At thinning, sample disks were taken at the base of 5 trees randomly selected at each site for the determination of density and shrinkage in the radial, tangential and longitudinal direction. The average density was 0.52g/cm3; the average tangential shrinkage was 12%, while the average radial shrinkage was 6.7%. There were differences in behaviour between the samples from the two sites, probably due to different vegetal materials, age of the plantations and cultivation models.
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