Masoumeh Makvandi; AbdolMahdi Bakhshandeh; Ali Moshatati; Mohammad Moradi Telavat; Aydin Khodaei joghan
Abstract
Objective: The effect of the combined use of nitrogen fertilizer with sugarcane residue compost and growth-promoting bacteria on wheat quality traits and yield in the heat stress conditions of the end of the season in Ahvaz was investigated.Methods: An experiment was carried out in the form of two split ...
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Objective: The effect of the combined use of nitrogen fertilizer with sugarcane residue compost and growth-promoting bacteria on wheat quality traits and yield in the heat stress conditions of the end of the season in Ahvaz was investigated.Methods: An experiment was carried out in the form of two split plots in the form of a randomized complete block design with three replications. The experimental factors include three sowing dates: 22 November, 11 December and 31 December in main plots; six combined of nitrogen with compost include control, 100% nitrogen, 75% nitrogen+ 25% compost, 50% nitrogen+ 50% compost, 25% nitrogen+ 75% compost and 100% compost in sub-plots and two levels of use and non-use of bacteria in sub plots.Results: Results showed the effect of Sowing date and the combined use of nitrogen with compost and growth-promoting bacteria were significant on all measured traits. Average comparison showed that combined use of 50% nitrogen + 50% compost with bacterial application increased the characteristics of Grain filling duration and Grain filling rate, Grain protein percentage and wet gluten. Also, the highest seed yield (5864 kg/ha) was obtained on the first planting date and combined consumption of 50% nitrogen + 50% compost and the lowest amount (1115 kg/ha) was obtained on the third planting date and the control treatment.Conclusion: The combined use of nitrogen fertilizer and compost with growth-promoting bacteria could reduce the negative effect of heat stress at the end of the season on the measured plant traits.
ahmad zare; aydin khodaeaei; zienab khezrepoor
Abstract
In order to evaluate the response from chia (Salvia hispanica L.) to temperature, under abiotic stresses (salinity and drought) three separate experiments was carried out in the laboratory of Agricultural Sciences and Natural Resources at University of Khuzestan in four replications in 2018. Treatments ...
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In order to evaluate the response from chia (Salvia hispanica L.) to temperature, under abiotic stresses (salinity and drought) three separate experiments was carried out in the laboratory of Agricultural Sciences and Natural Resources at University of Khuzestan in four replications in 2018. Treatments included temperature (5, 10, 15, 20, 25, 30, 35, 40 and 45 °C), salinity (0, 50, 100, 150, 200, 250, 300, 350, and 400 mM), and drought stress (-0.2, -0.4, -0.6, -0.8, -1, 1.2, and 1.4 MPa). In response to temperature, chia proved to be capable of germinating in the range of 10 to 40 °C. The base temperature, optimum temperature, and ceiling temperature were predicted to be 6, 28, and 44°C respectively. Germination percentage and germination rate decreased in response to salinity and at salinity of 400 mM, germination was completely inhibited. Salinity reduction of 50% in germination percentage and germination rate obtained at salinity 349 and 236 mM. 50% reduction in germination percentage and germination rate was observed at -0.92 and -0.79 MPa of drought stress. According to x50 parameter, chia is resistant to salinity and drought stresses. In conditions of saline soils and drought stress, it can be recommended for cultivation to farmers.
Aydin Khodaei-Joghan; Majid Agha-Alikhani; Majid Gholamhoseini; Reza Ataei; Ali Sorooshzadeh; Amir Ghalavand
Abstract
The current study was conducted to investigate the effects of different soil fertility treatments on qualitative and quantitative yield of sunflower (Helianthus annus L.) under different irrigation regimes. The experiment was conducted in Tarbiat Modares University research field at 2012 and 2013 growing ...
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The current study was conducted to investigate the effects of different soil fertility treatments on qualitative and quantitative yield of sunflower (Helianthus annus L.) under different irrigation regimes. The experiment was conducted in Tarbiat Modares University research field at 2012 and 2013 growing season. Treatments were arranged as split plots based on a randomized complete block design with three replicates. Irrigation regimes, (irrigation after consuming 30% (I1), irrigation after consuming 50% (I2) and irrigation after consuming 70% (I3) of available soil moisture) were randomly assigned to the main plots and the subplots were eight different fertilizer types (providing 100% of plant nitrogen requirement from urea as chemical fertilizer (F1), combination of chemical fertilizer and cattle manure (F2), zeocompost (F3), vermicompost (F4), zeoponix (F5), combination of zeocompost and vermicompost (F6) combination of zeocompost and zeoponix (F7), combination of vermicompost and zeoponix (F8)). The results indicated that the maximum seed yield was obtained in normal irrigation treatment (irrigation after consuming 30% of available soil moisture). Under water deficit stress conditions (irrigation after consuming 50 and 70% of available soil moisture), organic treatments amended with more zeolite (zeocompost, zeoponix and zeocompost + zeoponix) improved seed yield. Under severe water deficit stress condition (I3), zeolite-amended organic treatments (zeocompost, zeoponix and zeocompost + zeoponix) increased seed oil percentage by 8, 9 and 13 percent in the first year and by 13, 10 and 12 percent in the second year of the experiment in comparison with chemical treatment (F1). In addition, organic treatments improved oil quality through increasing linoleic and oleic acid percentage. Overall, the results suggest that combined application of processed organic fertilizers such as vermicompost, zeocompost and zeoponix not only increases sunflower seed yield and oil quality but also reduces chemical fertilizers need in sunflower production.