َAzam Sadat Yousefi; Mohammad Ali Bahmanyar; Bahi Jalili; Mahdy Ghajar
Abstract
Objective: Proper nutrition program is one of the main ways to improve plant quality and has a significant role in increasing its performance.Methods: To investigate the effect of the use of organic and mineral sources containing silicon on the concentration of silicon, nitrogen, phosphorus and potassium ...
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Objective: Proper nutrition program is one of the main ways to improve plant quality and has a significant role in increasing its performance.Methods: To investigate the effect of the use of organic and mineral sources containing silicon on the concentration of silicon, nitrogen, phosphorus and potassium in rice plants (Oryza sativa L.), an experiment in the form of chopped plots with three replications in the fields of Dazmirkandeh village in the suburbs of Sari city in 2019. All the experimental steps were done in the laboratory of Sari University of Agricultural Sciences and Natural Resources. The main factor was two varieties of rice and the secondary factor was the type and amount of silicon sources in 11 levels of fertilizer treatment.Results: According the results, the simple effect of variety and different sources of silicon on the concentration of silicon was significant in the flag leaf, biomass and grain of rice. The average concentration of nutrients in aerial organs in Tarem Hashemi cultivar was more than Shiroudi cultivar and different sources of silicon could increase the concentration of silicon elements in flag leaves by 70%, biomass by 16% and seeds by 20%, and nitrogen by 12 and 55 respectively, and 50%, increase phosphorus by 100, 60 and 87% and finally increase potassium by 20, 15 and 50%.Conclusion: In general, the use of all silicate treatments compared to the control treatment and basic fertilizer increased the concentration of silicon and other elements in the aerial parts of the plant.
mehran beygi kharvani; Ali Akbar Safari Sinegani
Abstract
A study was conducted as split plot layout with three replications at the research greenhouse of Bu-Ali Sina University, Hamedan in 2017 in order to investigate the consequences of using biochar and hydrochar, produced from potato plant residue on bean plant growth indices, chlorophyll content, and root ...
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A study was conducted as split plot layout with three replications at the research greenhouse of Bu-Ali Sina University, Hamedan in 2017 in order to investigate the consequences of using biochar and hydrochar, produced from potato plant residue on bean plant growth indices, chlorophyll content, and root mycorrhizal symbiosis in drought stress. The main plot and subplots in this study have been two drought levels and four amendment treatments, respectively. The study shows that the drought stress and the application amendments in various forms have had significant effects on plant growth indices, chlorophyll content, and root mycorrhizal colonization. Drought stress reduces root and shoot dry weights up to 39.8, 46.1%, leaf chlorophyll a (Chl a) content up to 52.6%, chlorophyll b (Chl b) content up to 58%, and total chlorophyll up to 54.52%. Although the number of rhizobium nodule on the root of plant decreases in drought stress, the rate of root mycorrhiza rises by 19.2% in drought stress. The use of biochar increased the mycorrhizal symbiotic indices significantly. It increases root colonization 11.34% and Glomeromycota spore number 50.5% in soil. The application of raw residue in soil has had the most positive effects on the plant growth indices and the leaf chlorophyll contents, leading to increased shoot dry weights (49.8%) and chlorophyll a, b and total contents (3.54%, 36.8%, and 14.5% respectively). The findings of this study show that among the treatments, the best plant growth index has been obtained in the use of potato biochar, which reduces the harmful effects of drought stress on the bean plant.
Tahereh Sedighi Shiri; Malek Hossein Shahriari; Mohammad Hedayat; Shahriar Osfouri
Abstract
In order to study the effect of organic amendment application on the growth and biochemical characteristics of French marigold (Tagetes patula) in soil contaminated with different levels of gas condensate, a factorial experiment was conducted based on a completely randomized design with three replications. ...
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In order to study the effect of organic amendment application on the growth and biochemical characteristics of French marigold (Tagetes patula) in soil contaminated with different levels of gas condensate, a factorial experiment was conducted based on a completely randomized design with three replications. The experimental factors consisted of gas condensate at five levels of 0, 7,500, 15,000, 30,000 and 60,000 μL per kg of soil, and soil amendment including vermicompost (5%), biochar (2%), Activated carbon (1%), vermicompost+ activated carbon+ biochar and non-amendment treatments. The results of the analysis of variance showed that the main and interactive effects of gas condensate and soil amendments were significant on traits of fresh and dry weight of root and shoot, chlorophyll a and b and proline content (P < 0.01). At the highest level of contaminant, the application of activated carbon and vermicompost+ activated carbon+ biochar respectively caused 3.82 and 4.45-fold increase in shoot fresh weight, 3.76 and 4.4-fold increase in root fresh weight, 2.52 and 2.56-fold increase in chlorophyll a, and also decreased 30.66 and 39.5 percent of proline content compared to the non-amendment treatment at this level of contaminant. The results of this research indicated the effective and useful role of organic soil amendment, especially activated carbon and vermicompost+ activated carbon+ biochar in reducing the toxicity of gas condensate on French marigold.