Tayebeh Zareei; SEYED ABDOLREZA KAZEMEINI; Hossein Ghadiri
Abstract
A field experiment was conducted to evaluate the effect of varying doses of haloxifhope-R-methyl ester herbicide on grass weeds grown at various stages in 2011-2012 growing season in Research Farm of College of Agriculture, Shiraz University. The study was carried out as split split plot based on randomized ...
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A field experiment was conducted to evaluate the effect of varying doses of haloxifhope-R-methyl ester herbicide on grass weeds grown at various stages in 2011-2012 growing season in Research Farm of College of Agriculture, Shiraz University. The study was carried out as split split plot based on randomized complete block design with three replicates. Treatments were haloxifhope-R-methyl ester herbicide doses (0.6, 0.8 and 1.0 L/ ha) as main factor, surfactant (with and without) as sub factor and time of herbicide application (2 leaf, 6 leaf and tillering of grass weeds) as sub sub factor. A check treatment (weedy) was also included. A rise of herbicide dose, decreased wild oat and foxtail dry weight 35.7 and 12.6 gr/m2, respectively. The results showed that the delay in herbicide application and reduction of herbicide dose decreased grain yield and its components. The highest reduction in grain yield was obtained with 0.6 L/ ha haloxifhope-R-methyl ester herbicide at tillering stage. Application of surfactant caused a decrease in weed dry weight compared to no surfactant and also increased grain yield significantly. In general, to achieve maximum grain yield and the best grass weed control, application of 1 L/ ha haloxifhope-R-methyl ester with surfactant use at 2-leaf in safflower field is recommended.
Elham Mostafaee; Mostafa Arab; Nematollah Etemadi; Mahmood Reza Roozban
Abstract
Nowadays, establishment and maintenance of turfgrasses due to high water requirements was faced with serious doubts. Hence, screening of drought resistance native grasses, and introduces them as turfgrass is not only effective in reduction of water usage but can also preserve plant gene pools of the ...
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Nowadays, establishment and maintenance of turfgrasses due to high water requirements was faced with serious doubts. Hence, screening of drought resistance native grasses, and introduces them as turfgrass is not only effective in reduction of water usage but can also preserve plant gene pools of the country. In the present experiment, Wheat grass and Bromus as two native grasses were compared with perennial ryegrass as control. After establishment and coverage of the pots surfaces by turfgrass in outdoor, three mowing heights including 2, 4 and 6 cm were applied on the species weekly. During the experiment, shoot growth, tillering, leaf color and leaf width, fresh and dry weight were measured weekly. The results of this research showed that Bromus due to undesirable tissue (leaf width more than 3 mm) and low density is not suitable for use in landscape. Wheat grass despite of rougher texture and less color than perennial ryegrass, has higher tillering, suitable color (7.59) and good texture (leaf width about 2 mm). Also, mowing height of 2 cm was determined as the best for three species studied.
Samaneh Asadi Sanam; Mohsen Zavareh; Hasan Shokri_Vahed; Parisa Shahinrokhsar
Abstract
A randomized complete block design with three replications was performed in Rice Research Institute of Iran, Rasht in 2008, to find the effect of supplement foliar application of nitrogen and potassium on ’Daylam‘ hybrid rice grain yield, its components and grain protein percentage. Foliar ...
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A randomized complete block design with three replications was performed in Rice Research Institute of Iran, Rasht in 2008, to find the effect of supplement foliar application of nitrogen and potassium on ’Daylam‘ hybrid rice grain yield, its components and grain protein percentage. Foliar application of 20 kg nitrogen (5 percent N) and 15 kg potassium (3 percent K2O) in different pre-anthesis stages was considered as treatments. Foliar application of distilled water was considered as control. Results showed that the grain yield and biological yield were increased in treatments which nitrogen and potassium was applied at pre-anthesis stages compared to control treatment. Foliar fertilization of nitrogen in maximum tillering stage had the highest effect on number of tiller per plant and grain number per panicle. The highest percentages of fertile tillers were related to foliar application of nitrogen at both maximum tillering and booting stages. Foliar application of nitrogen at maximum tillering and booting stage significantly increased grain protein content by 12.1 percent which it was 8.3 percent greater than control treatment. Result also showed that a significant and positive correlation exists between grain yield with biological yield and percentage of panicle fertility. Overall, it was concluded that maximum tillering stage is the best pre-anthesis phonological stage for foliar application of nitrogen and potassium on cv. Daylam hybrid rice.