The influence of soil agrochemical properties on the root and stem rot of Pinus sylvestris in urbanized forests

The interrelation between of stem and root rot distribution and agrochemical soil properties in urbanized pine forests is studied. The investigations was done at Ekaterinburg territory and the surrounding area on 12 sampling areas. The proportion of trees with root rot and the total from the root and stem rot is most closely related with the ratio N easy hydrolyzable / P 2O 5 in the forest floor, it was established. With the increase of nitrogen relative ensuring – the root and stem rot infestation is increased, with the increase of phosphorus relative ensuring – is reduced. The other agrochemical soil properties were less closely associated with the spread of rot.