Investigation and comparison of some morphological traits and the status of leaf and ‎root nutrients in some grafted combinations of almond compared with non-grafted ‎rootstocks under salinity stress

In order to study the effect of salinity stress on morphological characteristics, absorption and transport of some nutrients of almond, a factorial experiment based on a completely randomized design with two factors including rootstock and rootstock and scion combination in four levels(vegetative rootstocks: GF677, GN15, and tetra and seedling rootstock of bitter almond as control and Shahrood-12 on four mentioned rootstocks) and salinity of irrigation water in five levels (0.3(control), 2, 4, 6 and 8 dS/m) were used. The results showed that increasing salinity up to 8 dS/m reduced the leaf nitrogen content of Shahroud-12 cultivar in grafted form and non-grafted rootstocks. With increasing salinity up to 8 dS/m, the highest and lowest reduction in leaf phosphorus content were observed on the control (non-grafted) GF677 and Shahroud-12 cultivars on GF667, respectively. Increasing salinity resulted in increased potassium content of Shahroud-12 on GF677 and non-grafted GF677 rootstock. The results also showed that with increasing salinity, the ratio of sodium/nitrogen in the root of the control rootstocks increased. In salinity of 8 dS/m the highest and lowest sodium/potassium ratio was observed in the seedling rootstock of bitter almond and Shahroud-12 on GF677 rootstock. The results showed that Shahroud-12 grafted onto GF677 was the most tolerance compound to salinity.