Esmaeil Bakhshandeh; Hemmatollah Pirdashti; Fezzeh Gholitabar Faramarzi; Tayebeh Zholideh Rodposhti; Faezeh Zaefarian
Abstract
Objective: This study was performed to evaluate the effect of Rahnella aquatilis and Burkholderia cepacia bacteria on yield, yield components, and uptake of potassium and zinc elements in rice (Oryza sativa L.).
Methods: The experiment was conducted as a split-plot in a randomized complete block design ...
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Objective: This study was performed to evaluate the effect of Rahnella aquatilis and Burkholderia cepacia bacteria on yield, yield components, and uptake of potassium and zinc elements in rice (Oryza sativa L.).
Methods: The experiment was conducted as a split-plot in a randomized complete block design with three replications in 2022. Treatments included two levels of chemical fertilizer (100 and 75% of chemical fertilizer consumption based on the soil test results as optimal and reduced fertilizer levels, respectively) and four inoculation treatments (separate inoculation of R. aquatilis, B. cepacia, a co-inoculation (R.aquatilis+B.cepacia) and control (non-inoculation)).
Results: The results indicated that there was no significant difference between the optimal and reduced fertilizer levels in all the studied traits. The separate inoculation of R. aquatilis, B.cepacia and their co-inoculation increased the panicle length (from 5.88 to 11.3%), the number of total tillers in hill-1 (from 19.4 to 29.1%), the total number of grains in panicle-1 (from 22.8 to 46.5%), paddy yield (from 22.8 to 44.3%), biological yield (from 20.3 to 33.6%), 1000-seed weight (from 2.4 to 8.8%), potassium uptake in grain (from 6.0 to 41.4%) and in above-ground biomass (from 38.4 to 65.4%), zinc uptake in grain (from 6.29 to 40.9%) and in above-ground biomass (29.4 to 54.6%) as compared with the control (non-inoculation).
Conclusion: The application of plant growth-promoting rhizobacteria in combination (as the best inoculation treatment) reduced chemical fertilizers consumption without a significant reduction in the paddy yield, indicating the importance of these rhizobacteria for achieving sustainable agriculture goals.
Ghorban Khodabin; Zeinolabedin Tahmasebi-Sarvestani; Amir Hossein Shirani rad; Esmaeil Bakhshandeh; Mojdeh Sadat Khayat Moghadam; Shahryar Kazemi; mahsa rafati alashti; ali heidarzadeh
Abstract
In order to study the effects of late-season drought stress and foliar application of zinc sulfate (ZnSO4) and manganese sulfate (MnSO4) on physiological characteristics and yield of rapeseed cultivars, a factorial split-plot test has been conducted in a randomized complete blocks design for two cultivation ...
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In order to study the effects of late-season drought stress and foliar application of zinc sulfate (ZnSO4) and manganese sulfate (MnSO4) on physiological characteristics and yield of rapeseed cultivars, a factorial split-plot test has been conducted in a randomized complete blocks design for two cultivation years (2017-2019) in Karaj, Iran. The experimental treatments include two levels of irrigation (full irrigation (control) and withholding irrigation from flowering stage) and four levels of foliar application (control, ZnSO4, and MnSO4, separately, as well as their combined application) as factorial in the main plots, with rapeseed genotypes (Nima, Niloofar, and KS7) considered as subplots. Combined foliar application of zinc and manganese sulfate under full irrigation conditions increase the content of seed oil and soluble carbohydrates by 3% and 11%, respectively, compared to the control. On the other hand, withholding irrigation from flowering stage increases the percentage of seed oil and leaf proline content, compared to the control by 9% and 5.2%, respectively. Niloofar genotype has had the highest seed yield (5261 kg/ha) under full irrigation conditions, i.e. 9% and 11.8% higher than KS7 and Nima genotypes, respectively. Nima genotype with 3371 kg/ha has had the highest yield in the conditions of withholding irrigation. In general, in both irrigation treatments, simultaneous foliar application of zinc sulfate and manganese has had the greatest impact on the physiological traits of the studied genotypes, thus Niloofar genotype is recommended for full irrigation and Nima genotype for interrupted irrigation.