Elimination trial with six tree species in Korbal plain and ‎effects of drainage water on their growth

The aim of the study was to investigate the adaptability of six native and exotic tree species at Korbal plain, Shiraz, I. R. Iran and the effects of drainage water on their growth and survival. The experiment design was split plots with three replicates. The main plots consisted of salty and ordinary water, supplied by drainage channels and Kor river, respectively. The subplots consisted of six species, including Eucalyptus camaldulensis Dehn, E. microtheca F. Muell., Acacia stenophylla, Fraxinus rotundifolia Miller. Populus euphratica Oliv.and Tamarix aphylla (L.) Karst.The results showed that the effects of irrigation treatments on survival and growth were not significant at first year of the trial. Resistance of the E. camaldulensis, species E. microtheca, A. stenophylla and T. aphylla to salinity and drought was good, whereas the resistance of F. rotundifolia to both environment conditions was not good and resistance of P. euphratica to salinity was excellent, but its resistance to drought was low. The tolerance of the species, E. camaldulensis, A. Stenophylla, E. microtheca and T. aphylla to frost (-9ºc) at the first year of the trial was low and the crown damage percentage was 80.8, 100, 31-6 and 97.1, respectively. E. microtheca was the most tolerant species due to its highest percentage of survival (88.3) at the end of the trial. The irrigation with drainage water had remarkable effects on tree growth and survival, particularly at summer

Effect of irrigation intervals on establishment of Ziziphus spina-christi saplings

In southern parts of Fars province in Iran, Christ's Thorn Jujube (Ziziphus spina-christi) is considered as the dominant species amongst other woody species. However, the lack of its ability for natural regeneration is coupled with high mortality rates of cultivated individuals. Moreover, a common drought within the arid areas of Iran contributes to those limitations. In order to investigate the effect of irrigation intervals on establishment of Z. spina-christi saplings, a complete randomized blocks design with 4 treatments and 3 replications was conducted across a study area near Lar, Fars province. Treatments included irrigation intervals of 0, 15, 30, 45 days, where irrigation was solely done in the first year. Following this, the healthy saplings as well as the heights were inventoried in the second year to determine the sapling establishment as a function of the most appropriate irrigation. The results showed significant effect of treatments on sapling height. However, no significant effect was observed for number of saplings. Therefore, the irrigation intervals 30 and 45 days during the first year, each with 30 litters are suggested for establishment of Z. spina-christi saplings