Document Type : Research Paper
Authors
1
Assistant Professor, National Salinity Research Center, Agricultural Research, Education and Extension Organization (AREEO), Yazd, Iran
2
Associate Professor, Research Division of Natural Resources, Yazd Agricultural and Natural Resource Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Yazd, Iran
Abstract
In order to determine salinity tolerance threshold and yield decreases per unit increase of soil salinity in selected Populus euphratica Oliv provenances, a split plot experiment based on randomized complete block design (RCBD) with two factors of provenances in 13 types (1- Mofid hybrid (P. euphratica x P. alba), 2- Dezfoul, 3-Zabol, 4-Gotvand, 5-Lorestan, 6-Hamidiyeh, 7- Yazd 1, 8- Yazd 2, 9-Gharekhlar, 10-Kerman, 11-Garmsar, 12- Manjil, 13-Esfahn) and soil salinity at five levels (2.8, 5.96, 9.47, 13.2 and 16.47 dS.m-1). The study was performed with 3 replications during 2022-2024 at Hosein Abad Station, National Salinity Research Center, in 2023 and 2024. The results showed, the lowest salinity tolerance threshold was observed in Kerman (2.81 dS/m), Hamidiyeh (3.76 dS/m) provenances and Mofid hybrid (2.89 dS/m). On the contrary, the highest salinity tolerance threshold was observed in Garmsar (6.57 dS/m) and Dezful (6.05 dS/m) provenances, respectively. The highest yield reduction slope was observed in Mofid hybrid (8.19%), Manjil (7.42%), Garmsar (7.15%), Kerman (6.89%), and Hamidiyeh (6.80%), respectively. The lowest yield reduction slope was observed in Gotvand (4.53%), Esfahan (4.57%), Gharekhlar (4.88%), Zabol (5.16%) and Dezful (5.30%), respectively. Overall, the results showed that reduction in yield by 50% in Gotvand, Gharekhlar, Dezful, Zabol, Esfahan and Yazd 1, were observed at salinity levels of 15.55, 15.51, 15.32, 15.27, 14.99, and 14.05 dS/m, respectively. In general, Gotvand, Qarekhlar, Dezful, Zabol, Isfahan, and Yazd-1 provenances were classified as tolerant, whereas the Mofid Hybrid, Hamidiyeh, and Kerman provenances were classified as semi-tolerant to salinity. Therefore, considering the level of tolerance to salinity and other growth traits, the provenances of Dezful, Gotvand, and Zabol are recommended for wood production in saline conditions.
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