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.
Seyed Shahram Shafiye; Hasan Mohammad Alizade; Hossein Moghadam; Ali Reza Yousefi
Abstract
To study the effect of different weed control methods in tomato, an experiment was conducted as completely randomized block design with three replications at the research farm of University of Tehran (Karaj) in 2008. The treatments consisted of post emergence (at recommended rate) or pre emergence (reduced ...
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To study the effect of different weed control methods in tomato, an experiment was conducted as completely randomized block design with three replications at the research farm of University of Tehran (Karaj) in 2008. The treatments consisted of post emergence (at recommended rate) or pre emergence (reduced rate in combination with mulch) application of metribuzin, rimsulfuron and sulfosulfuron, and also different binary combinations of these herbicides which applied post or pre emergence (in combination with mulch), metribuzi+haloxyfop-methyl, trifluralin+metribuzin, and also mulch alone, weed free and weedy checks. Traits such as weed density and biomass, tomato fruit yield and biomass were evaluated. The results showed that only post emergence application of sulfosulfuron (92%), sulfosulfuron+rimsulfuron (93%) controlled bindweed effectively. However, all herbicide treatments provided good (more than 80%) to excellent (more than 90%) control of redroot pigweed, smooth pigweed and common purslane. Tomato response to rimsulfuron, sulfosufuron and mtribuzin consisted of chlorosis in new terminal growth that recovery occurred after 4 weeks. The results suggest that acceptable control of different weed species in tomato could be obtained by pre-emergence application of rimsulfuron, sulfosufuron and metribuzin in combination with either mulch or post-emergence herbicide.