Mostafa Darvishnia; Moslem Moosavian
Abstract
The current study been conducted to achieveto effective antagonists for diseases control of seedling damping-off greenhouse pepper, casead by Rhizoctonia solani. Experiments has conducted based on completely randomized design in the faculty of agriculture and natural resources of Lorestan University ...
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The current study been conducted to achieveto effective antagonists for diseases control of seedling damping-off greenhouse pepper, casead by Rhizoctonia solani. Experiments has conducted based on completely randomized design in the faculty of agriculture and natural resources of Lorestan University in 2016-17. First, the fungi and biological agents were isolated and identified of the rhizosphere of Solanaceae plants. The antagonistic ability of fungal and bacterial isolates, such as Trichoderma harzianum and Trichoderma virens fungi and Bacillus subtilis bacteria, against R. solani was studied by using dual culture method. As well as antagonistic ability of fungal and bacterial agents and Trichomix HV biological fungicide were study in a greenhouse condition. The results showed that both species of T. harzianum and T. virens the prevented growth of fungi 9.45 and 15.59 percent respectively by colonization and sporulation in PDA. Antagonistic bacterial also caused effects such as outpour of the contents of hyphae, color change at the tip of hyphae, thinning and reduction of mycelium up to 8.47 percent. Also, results in greenhouse condition showed that B. subtilis and T. harzianum treatments have the most positive effects on growth traits such as height and weight (wet and dry) of the root and stem and reduced the severity of the disease up to 60.33 and 70.33 respectively; therefore they are the best antagonistic agents to control R. solani on pepper.
Azam Feli; Saeideh Maleki Farahani; Hossein Besharati
Abstract
In order to evaluate the effects of organic, chemical and biological fertilizers on plant and soil properties in saffron cultivation the experiment was performed as factorial with two factors based on a randomized complete block design with three replications in the research farm of Shahed University ...
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In order to evaluate the effects of organic, chemical and biological fertilizers on plant and soil properties in saffron cultivation the experiment was performed as factorial with two factors based on a randomized complete block design with three replications in the research farm of Shahed University during 2015-2016 growing seson. in this experiment the first factor was nitrogen fertilizer (urea) in three levels (0, 50 and 100 kg per ha) and second factor was different types of non-chemical fertilizers in four levels (control, vermicompost, PGPR biofertilizer containing bacteria Pseudomonas and Bacillus and integrated application of biofertilizer and vermicompost). The results showed that fertilizer treatments affect significantly on qualitative and quantitative properties of plant and soil. Among the fertilizer treatments, the integrated application of vermicompost alongwith 50 kg/ha chamical fertilizers showed the most significant increment in yields and improved soil properties. As in this treatment stigma dry yield, soil nitrogen content, soil organic mater and available soil phosphorus increase by 42.6, 66.67, 68.39, and 43.75% compared to control, respectively. Totally integrated application of vermicompost alongwith half of recommended urea fertilizer can increase yield and improve soil properties in saffron cultivation.