Showing 3 results for Safaee
D. Safaee, S.m. Okhovat, G.h. Hedjaroude , H. Younesi,
Volume 12, Issue 43 (spring 2008)
Abstract
In order to diagnose form species of Bipolaris involving root and crown rot of wheat plants and determine their distribution, frequency and disease severity, 410 wheat fields (W. Fs.) in different regions of Kermanshah province were sampled at seedling, tillering and heading stages during three crop years (1997– 2000). Also 90 W. Fs. (30 per year) in different regions of the province were chosen randomly to estimate percentage of infected wheat plants. For the isolation of the fungi from tissues of root, subcrown internodes, crown and foot, the tissues were surface sterilized and placed on culture media. The results showed that there were some root and crown rots in the most regions of the province and the percentage of diseased plants was 0-24%, whose average was 3.2%. Forty three isolates belonging to form genus Bipolaris were isolated including form species B. sorokinina, B. cynodontis and B. spicifera. All three form species were pathogenic under greenhouse conditions. Disease severity and frequency of B. sorokinina were more than the others. Disease severity of B. cynodontis and B. spicifera was the same and their differences compared with the control were significant.
S Jamali, E Pourjam, N Safaee, A Alizadeh,
Volume 13, Issue 47 (4-2009)
Abstract
In order to estimate the loss of rice caused by white tip nematode, (Aphelenchoides besseyi), to Alikazemi cv., two series of experiments were conducted in greenhouse and microplot conditions at Rice Research Institute, Rasht (Guilan province) during 2005-2006. The microplots sizes were 0.5×2 meter. Rice seedlings were inoculated by plastic tube method with 0, 100, 300, 500, 700 and 900 nematodes per plant. The experiments were arranged in greenhouse and microplot conditions as a completely randomized design and completely randomized block design with four replications, respectively. The factors under investigation consisted of symptoms (number of plants and Leaves infected), yield and population density of nematodes. The variance analysis of data showed significant differences among treatments in all parameters. The minimum infestation level leading to symptoms and yield loss in microplot condition (500 nematodes) was greater than greenhouse (300 nematodes). Regression analysis of data revealed that the yield reduction was mainly explained by population of nematodes in greenhouse and microplot (R2= 92.56, R2 = 91.55). Also, there was a positive correlation at 5% level of probability between disease incidence and nematode population (R2= 84.42, R2 = 75.27). The resulting equations from regression can be used to estimate crop loss from population of nematodes.
Sh Mohammad Nejad Kiasari, M Safaee, Sh Nourozi, H Ahmadian, A Mataji,
Volume 13, Issue 48 (7-2009)
Abstract
Determination of suitable species is the most important factor in success of forestation in unfavorable conditions. One of the least costly and the shortest ways for introduction of adaptable species in an area is recognition of the plants that grow naturally. The objective in this study was to find out the effects of protection and water spreading operations on the quantitative improvement of Greek Juniper seedlings. In this study, the areas of water spreading station (Research station of Poshtkoh Water spreading) and an area in western section of water spreading station (an area as control) along the Poshtkoh watershed were chosen. The research was performed on counting of Greek Juniper (Juniper excelsa) in each of two areas. The ratio estimation method was used in a randomized systematic design in strips with the width of 50 meters and 200 meters apart for registration of qualitative parameters of Greek Juniper (Juniper excelsa). The total surface of areas was 600 ha and inventory with intensity of 16 percent has been done. This study showed that in spite of the less number of Greek juniper trees per ha in the station (0/104) in relation to the number of Greek juniper trees per hectare out of the station (0/666), the number of the Greek juniper seedlings in the station was eight times (8.34) more than the number of the Greek juniper seedlings out of the station. As to the effect of protection and water spreading operations on natural growth and increase of number of Greek Juniper seedlings in the station, forestation using this species in this area is recommended.
