Volume 8, Issue 1 (3-2020)
Abstract
Aims: Eucalyptus camaldulensis is one of the most productive and best adapted species in the afforestation. The aim of the present study was to investigate the growth and survival rate of five Eucalyptus camaldulensis provenances (two from Mazandaran, one from Guilan, one from Ahwaz, and one from Ilam) at the Research Center of Tropical Plants in Mehran, Iran, during 2009-2013. Materials & Methods: The experiment was carried out in Mehran Research Station in Ilam Province with a randomized complete block design and three replications, at 25 plants in each block at a distance of 4×4m. At the end of the growing season, survival, height, circumference at breast height (C.B.H), canopy diameter growth (C.D.G) 147 trees were evaluated.
Findings: The result of ANOVA indicated a significant difference between the provenance origins for all traits (p<0.01). The survival rate of the studied provenances ranged from 41.7% to 98.3%, whereas Shafarood and Mehran provenances had the highest rate of survival. The mean of annual height growth of five studied provenances varied from 64.57 to 205.29cm. In addition, the characteristics of C.B.H and C.D.G in the selected provenances ranged between 3.60 to 9.44 and 25.51 to 75.26cm, respectively. Among the above mentioned characteristics, Shafarood followed by Ahwaz had the greatest values.
Conclusion: The seedlings from the Shafarood origin indicated the highest average in all the studied characteristics. The results provide useful information for choice of E. camaldulensis provenances to apply future afforestation in the Mehran region.
Volume 25, Issue 4 (5-2023)
Abstract
Development of saffron corm resources with higher ability to acquire nutrients and produce more dry matter may offer one solution to mitigate the yield loss problem in growing areas. In the present study, variability in growth, nutrition, and biomass production among saffron ecotypes grown for a two-year field experiment was investigated at Kerman, a semi-arid region of Iran, during the 2015-2016 and 2016-2017 growing seasons. The results indicated that the studied ecotypes significantly differed in the mentioned parameters and responded differently to growing seasons. High-agronomic performance (yield) and nutrient-efficient ecotypes, e.g. Ferdows, Sarayan, and Bajestan, accumulated more nutrients as a result of increased Relative Growth Rate (RGR) and Net Assimilation Rate (NAR) before the critical stage, resulting in higher dry matter production. In contrast, ecotypes with lower potential to acquire nutrients, e.g. Zarand and Torbat, had lower growth and dry matter. Further, the results showed that variation in nitrogen (N) concentration in corms and leaves was not significant, although significant variation existed in N uptake, N uptake efficiency, and N use efficiency. This can be due to variation observed in the ability of corms to utilize nutrients for dry matter production. Cluster analysis revealed the presence of highly efficient, moderately efficient, and inefficient ecotypes. Generally, the results indicated that ecotypes with higher growth rate before critical stage showed more potential to uptake and utilize nutrients to produce more dry matter, and exhibited more nutrients use efficiencies. Overall, this study suggested that the nutrient acquisition capacity of ecotypes, a desired feature associated with higher biomass production, can be an important factor in selection programs.
Iran Fatemeh Abdorrahimain, Iran Mahmood Heydarian, Iran Mohammadamin Emami,
Volume 30, Issue 1 (1-2023)
Abstract
The petrographic analysis of ceramics can often answer a wide variety of archaeological questions, especially regarding fabrication, manufacturing processes which were despite focused on the construction and trade of pottery. However, ceramics which were collected from the same site can mostly differ in their chemistry as well as fabrics. As is applied in many cases, essential archaeological survey and documentations in a theoretical framework are key to the proper application of ceramic petrography through the archaeometrical research. This paper deals with the petrographically approach on Kura-Araxes or Early Bronze Age ceramics manufacturing processes of Sonqor Plain. It is of worth-knowing to contribute that the contact and exchange strategies between indigenous communities and several cultural-spheres during Early Bronze Age (beginning of the fourth millennium BC) in this area. Morphological data along with mineralogical composition of ceramics were applied to determine the major elements of the pottery sherds. Based on the result, one can be suggested that all of sherds are in the same group and were demonstrated mightily local productions. The ceramic manufacturing technology indicates same patterns of material interactions during the ETC or Kura-Araxes in all of the investigated sites in Sonqor Plain.
