Environment impact assessment of tilapia farming in suitable areas of Yazd province

The aim of the present study is the environmental impact assessment of tilapia (Tilapia nilotica) farming in suitable areas of Yazd province. This research was conducted to achieve appropriate use of these resource, employment and development of central less developed regions of Iran along with identifying the human and ecological effects of its implementation in order to minimize environmental impacts as well as economic and social justification. Total area of about 100 ha at 6 farms in selective areas include Tabas (central region), Ardakan (Chahafzal), Mheriz (Bahadoran), Bahabad (Central Region),Taft (Chahbeygi-Dehshir) and Khatam (Tanoore-Lahoor) was assessed in order to tilapia farming and aquaculture industry development. So, impact assessment of this project development in environmental and social - economic parts was considered and Matrix method was utilized for the environmental impact assessment. Based on investigation, accessibility of the region, compatibility with the other land uses, lack of monuments in the area, not covered with the sensitive habitats range, the lack of permanent river flow, low quality of underground water and end up underground water flows in downstream desert and evaporated which result in impossibility of escaping introduced fish from the farm and the use of existing spaces in the first half of the year to product lead to make fewer infrastructure costs and increase revenue, are the main criteria for the sustainable development of this species culture in the area. Considering the executed studies and results of operation phase matrix, it was concluded that there is no considerable destructive impacts related to the project. Therefore due to the fact that 50% of means in rows and columns of the matrix were not less than -3.1 so, we proposed execution of it with rehabilitation plans. Therefore, some strategies and plans to consider reducing the negative effects and enhance positive effects of the project, including monitoring programs, were proposed

The effect of different levels of date meals on cockerles performance

In order to study the effect of replacing different levels of date meal to corn, 180 one-day-old male broiler Ros308 chicks with 5 treatments and 3 replicates were used. The chicks had free access to food and water during the experimental period. Five experimental treatments were as follows: the first treatment (control group) consisted of the diet which lacked date meal, the second treatment was the diet which contained %5 of date meal which replaced corn, the third treatment was the diet which contained %10 of date meal, in the fourth treatment %15 date meal was used and in the fifth treatment %20 of date meal was used. In this experiment, feed consumption, average daily gain, feed conversion and the measurement of the metabolism energy were recorded after the end of each week and the broiler chicks were weighted each week. At the end of the experimental period two broilers from each pen were selected, killed and then dressing percentage, abdominal fat (the fat around the cloaca and gizzard), intestines, gizzard, spleen, pancreas, liver and gall-bladder were measured. The best average daily gain was observed in the group which had %15 date meal. Maximum feed consumption was observed in the group with %5 date meal and minimum feed consumption in the control group. The most body weight gain was related to %15 replacement group and the most dressing percentage was related to %15 replacement of the date meal group. The most fecal moisture was related to %20 date meal. Considering intestinal histopathological study, the diet containing %10 date meal had the least effect on intestinal thickness. According to the results, 15% is the best level of date meal inclusion in the diet of cockerels

Effect of Rimsulfuron, Imazapic and Imazamox Herbicides on Broomrape (Orobanche aegyptiaca) in Tomato (Lycopersicum esculentum)

Experiments, in Petri dish and greenhouse, were carried out to investigate the efficiency of three herbicides (rimsulfuron, imazapic and imazamox) in controling broomrape. In Petri dish study, herbicides were applied at 0.05, 0.25, 1.25, 6.25 and 31.25 micro-mole doses to broomrape seeds at germination stage without a host plant and adding GR24 as stimulator. In the greenhouse experiments, the efficiency of these herbicides to control broomrape in two varieties of tomato (Viva and Hyb.Petopride II) was investigated. Treatments were four doses of rimsulfuron (25, 50, 75 and 100 g ai/ha), imazapic (5, 10, 15 and 20 g ai/ha) and imazamox (0.4, 0.8, 1.2 and 1.6 g ai/ha) at one, two and three applications. Results of Petri-dish experiments showed that rimsulfuron and imazapic significantly reduced radicle elongation of seedlings as compared to the control, while, imazamox did not have any effect on broomrape seed. Each dose was applied for one, two and three times with in 15, 29 and 43 days after within transplanting tomato seedlings. Results of pot experiments indicated that the responses of two tomato varieties herbicides were different. Viva was responsive to herbicidal effect and produced higher biomass than Hyb.Petopride II. Rimsulfuron was a suitable herbicide in tomato to control broomrape. Rimsulfuron at doses of 25, 50 and 75 g ai/ha (three times of application) were the best doses, specially in viva were the best treatments for broomrape control and producing tomato biomass. Imazapic also, at 5 g ai/ha (two times of application) and 10 g ai/ha (single application) was an effective treatments in variety of viva. Imazamox treatments did not appear to be suitable herbicides in this study