Kosar Asadzadeh; Habiballah Nadian Ghomsheh; Vahid Keshavarz-Tohid; Abdolreza Siahpoosh
Abstract
Objective: In order to investigate the impact of plant growth-promoting Pseudomonads isolates and filter cake on the alterations of chlorophyll pigments and growth components in spinach plant under metribuzin herbicide stress, a factorial experiment was conducted as completely randomized blocks at the ...
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Objective: In order to investigate the impact of plant growth-promoting Pseudomonads isolates and filter cake on the alterations of chlorophyll pigments and growth components in spinach plant under metribuzin herbicide stress, a factorial experiment was conducted as completely randomized blocks at the greenhouse of the Department of Soil Science of the Agricultural Sciences and the Natural Resources University of Khuzestan in 2018-2019.
Methods: In this study, Pseudomonas alloputida RUM14 and P. protegens CHA0 were used as PGPR isolates and filter cake was utilized as organic fertilizer.
Results: Statistical analysis of the study’s results indicated that treating spinach plants with Pseudomonas alloputida RUM14, P. protegens CHA0, and filter cake significantly increases chlorophyll a (47, 21, 29%, respectively) and b pigments (42, 20, 18%, respectviely) and carotenoids (96, 33 and 84%) and also increases the dry weight of root (respectively 59, 30, 45%), length of root (108, 51, 53%), dry weight of stem (56, 49, 13%) and the stem length (31, 19, 14%). Statistical analysis clarified that applying metribuzin herbicide at the rate of 100 grams per hectare dramatically reduces the content of photosynthetic pigments and growth components. However, utilization of growth-promoting rhizobacteria and filter cake effectively decrease the extent of such damage.
Conclusion: The results of this investigation clarified for the first time that the use of Pseudomonads plant growth-promoting rhizobacteria and/or filer cake, significantly enhance the photosynthetic pigments and growth components of spinach plant. Additionally, the mentioned treatments reduce the damage caused by metribuzin herbicide application.
mohammad reza baghbani; Abdolreza Siahpoosh; Alireza Shafeinia; Elham Elahifard
Abstract
Objective: Fennel, scientifically named Foeniculum vulgare L., is one of the most important and widely used medicinal plants of the Apiaceae family. This condition ultimately affects its performance, reducing it.
Methods: Therefore, in order to evaluate weed control and boost performance via plant density, ...
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Objective: Fennel, scientifically named Foeniculum vulgare L., is one of the most important and widely used medicinal plants of the Apiaceae family. This condition ultimately affects its performance, reducing it.
Methods: Therefore, in order to evaluate weed control and boost performance via plant density, trifluralin herbicide, and mechanical control, an experiment was conducted in the form of randomized complete blocks with three factors and three replications in the Faculty of Agriculture, Khuzestan University of Agricultural Sciences and Natural Resources in 2019-2020. Tested factors included mechanical control at two levels (without cultivator and double cultivator), plant density at three levels (6, 12, and 24 plants per square meter) and application of trifluralin herbicide at three levels (zero as a weed control), 1.5, and 3 liters per hectare).
Results: The results of this study showed that treatment with (density of 24 plants per square meter of fennel and 1.5 liters per hectare of trifluralin and with 2 cultivators) did not show any significant difference from the abovementioned treatment.
Conclusion: Therefore, to reduce the use of herbicides, a dose of 1.5 liters of trifluralin can be used instead of a dose of 3 liters, along with 2 cultivators. The highest economic yield of fennel (1313 kg/ ha) belonged to the two plots above. This study showed that the highest essential oil was observed in double cultivator plots by 9.5% and the lowest in uncultivated plots by 4.76%, indicating the effectiveness of the cultivator compared to other factors in the production of essential oil.
Hossein Akbia; Elham Elahifard; Abdolreza Siahpoosh; Ahmad Zare
Abstract
Due to the low competitive ability of sesame against weeds, the presence of weeds greatly reduces sesame yield, therefore, weed control is very important in this crop. An experiment was carried out as split plots based on randomized complete block design with three replications in July 2017 in Ramhormoz, ...
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Due to the low competitive ability of sesame against weeds, the presence of weeds greatly reduces sesame yield, therefore, weed control is very important in this crop. An experiment was carried out as split plots based on randomized complete block design with three replications in July 2017 in Ramhormoz, Khuzestan, Iran. In this experiment, treatments including sowing method as the main plot at three levels (flat, sowing on ridge and in farrow) and herbicide application as the sub plot including oxyfluorfen (360 ml ai ha-1), diuron (540 g ai ha-1), trifluralin (1200 ml ai ha-1), and linuron (562.5 ml ai ha-1). Hand weeding and weed infested treatments, also, were considered for comparison. Results indicated that the highest dry weight reduction percentage of nulta jute (Corchorus olitorius L.) was observed in trifluralin application in farrow (83.09%) at 75 days after herbicide application and field bindweed (Convolvulus arvensis L.) in oxyflurfen application (83.30%) at 30 days after treatment. The highest of biological and seed yield was observed in hand weeding in farrow (10142.7 and 1930.37 Kg ha-1, respectively). Application of trifluralin in farrow, also, was effective treatment according seed yield (1878.2 Kg ha-1). The highest oil percentage (52.36%) was obtained in hand weeding in farrow. The highest harvest index (18.23%) was observed in farrow. Totally, the best integrated method to control weeds and improve sesame yield, was sowing in farrow along with hand weeding, or the application of trifluralin.