Mona Soroori; Seyed MohammadReza Ehteshami; Mohammad Rebiyi; Kazem Khavazi
Abstract
In order to evaluate effect of Azotobacter chroococcum strains on yield, yield components and qualitative indices of winter rapeseed (Brassica napus L.), an experiment was conducted during 2009-2010 growing season at Research Institute of Rice in Rasht. The experimental design was completely randomized ...
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In order to evaluate effect of Azotobacter chroococcum strains on yield, yield components and qualitative indices of winter rapeseed (Brassica napus L.), an experiment was conducted during 2009-2010 growing season at Research Institute of Rice in Rasht. The experimental design was completely randomized block, with three replications. Investigated treatments were including control (without seed inoculation), seed inoculation with Azotobacter chroococcum strains 6, 9, 11, 12, 13, 14, 15, 16, 19, 21, 23, 25, 28, 35 and 38. Results showed that Azotobacter chroococcum significantly affected on all traits. The highest of seed oil yield and K, P, Mg content caused by A. chroococcum strain 14. A. chroococcum strain 12 caused the highest of seed yield with average of 3532.43 kg/ha that hadn’t significant difference with strains 9 and 14. As A. chroococcum strain 12 caused the highest of seed yield components and N, Ca, oil seed content. Growth promoting hormones production, N2 fixation, mineral nutrients dissolubility such as phosphorus, siderophore production and kinds of antibiotics are the effect of Azotobacter chroococcum mechanisms that seems to be using at least one of these mechanisms is increased plant yield. Generally, A. chroococcum strain 12, A. chroococcum strain 14 and A. chroococcum strain 9 had more positive effect on traits compared with other strains. Results of this experiment showed the use of A. chroococcum increases yield and qualitative characteristics of rapeseed and therefore can be used as supplementary of chemical fertilizers.
Atefeh Haghi Kashani; Mostafa Arab; Seyed Reza Tabaei Aghdaei; Hossein Zeinali; Mahmoud Reza Roozban
Abstract
This study was carried out to investigate flower yield and yield components in Iranian Rosa damascena using 20 genotypes, collected from different regions of Iran and grown in Drylands and Deserts Research Station of Kashan, Iran, using a randomized complete block design with three replications in 2007-2008. ...
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This study was carried out to investigate flower yield and yield components in Iranian Rosa damascena using 20 genotypes, collected from different regions of Iran and grown in Drylands and Deserts Research Station of Kashan, Iran, using a randomized complete block design with three replications in 2007-2008. Flower yield per plant, number of flowers per plant, plant height, leaf length, width, length and width of bud, length and width of pedicle, fresh weight of flower, number of petal per flower, length and width of receptacle, plant growth date, budding date, time of flowering and flowering period were recorded. A significant phenotypic correlation indicated a strong positive relationship between flower yield and number of flowers per plant. Result of stepwise regression analysis showed that 94 percent of total variation of flowers yield per plant could be explained by number of flowers per plant and weight of the fresh flower. The path analysis indicated that the number of flower per plant had the most direct effect on the yield. This suggested that number of flowers per plant and weight of the fresh flowers are the most important components determining flower yield per plant in Damask rose.
Hossein Nastari Nasrabadi; Hossein Nemati; Ali Reza Sobhani; Hossein Aroiee
Abstract
Using mulch to decrease and optimize water use, increase yield and fruit quality is known as a practical method. For this purpose, a split-factorial experiment based on complete block design with three replications on two melon cultivars was conducted in Torbat-e-Jam, Iran. Interval irrigation treatments ...
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Using mulch to decrease and optimize water use, increase yield and fruit quality is known as a practical method. For this purpose, a split-factorial experiment based on complete block design with three replications on two melon cultivars was conducted in Torbat-e-Jam, Iran. Interval irrigation treatments in three levels (six, eight and 10 days) were considered as main plot and mulch (rice straw and paddy, plastic and no mulch) and cultivar (Khatooni and Ghasri) were considered as sub plots in a factorial design. Results showed that there was a significant difference between plastic mulch and the control and also between interval irrigation treatments for yield, sugar percentage, resistance to damping off and spider mite, leaf area and soil moisture. The largest leaf area and soil moisture was observed with plastic mulch. The largest contamination to spider mite and damping off were occurred using straw plus paddy rice mulch. Plastic mulch increased the sugar percentage of both cultivars as well. Plastic mulch for six day interval irrigation increased yield and fruit quality through increased yield and fruit quality to increase for more than eight day interval irrigation. Regarding the advantages of plastic mulch for reduction of water use and improvement of yield and fruit quality, using plastic mulches is recommended for dry lands.