Hossein Ghadiri
Shiraz University
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Featured researches published by Hossein Ghadiri.
Weed Technology | 2006
Ehsan Bijanzadeh; Hossein Ghadiri
Field studies were conducted at Shiraz, Iran, during 2000 and 2001 to investigate the effect of separate and combined herbicide treatments on weed control and corn yield. Separate and combined herbicide treatments included 14 combinations applied at two rates. Herbicides reduced weed biomass compared with the weedy check. In both years, maximum reduction in weed biomass was observed with atrazine plus alachlor at 1 + 2.44 and 1.5 + 1.92 kg ai/ha and minimum reduction in weed biomass was observed with rimsulfuron at 0.02 and 0.04 kg/ha. In 2000 and 2001, 2,4-D plus MCPA at 0.36 + 0.31 and 0.54 + 0.46 kg/ha, and alachlor plus 2,4-D plus MCPA at 1.92 + 0.54 + 0.46 kg/ha, and 2.44 + 0.36 + 0.31 kg/ha, controlled 80 to 100% of field bindweed and rimsulfuron at 0.02 and 0.04 kg/ha controlled 17 to 70% of field bindweed. All herbicide treatments controlled redroot pigweed 60 to 100%. In 2000, at 6 and 17 WAP, minimum biomass reduction of Chinese-lantern-plant was observed with 2,4-D plus MCPA at 0.36 + 0.31 and 0.54 + 0.46 kg/ha, and primisulfuron plus prosulfuron at 0.02 + 0.02 and 0.03 + 0.03 kg/ha. Rimsulfuron plus primisulfuron plus prosulfuron at 0.02 + 0.03 + 0.03 and 0.04 + 0.02 + 0.02 kg/ha reduced johnsongrass biomass 96 to 100% and the efficacy of rimsulfuron increased when tank mixed with primisulfuron plus prosulfuron. Results of both years showed that all herbicide treatments increased corn grain yield as compared with the weedy check. Maximum corn grain yield was obtained with combinations of atrazine plus alachlor at 1 + 2.44 and 1.5 + 1.92 kg/ha. Nomenclature: Atrazine; alachlor; bentazon; bromoxynil; 2,4-D; MCPA; primisulfuron; prosulfuron; rimsulfuron; chinese-lantern-plant, Physalis alkekengii L. #3 PHYAL; field bindweed, Convolvulus arvensis L. # CONAR; johnsongrass, Sorghum halepense L. # SORHA; redroot pigweed, Amaranthus retroflexus L. # AMARE; corn, Zea mays L. Additional index words: Corn grain yield, weed biomass, herbicides. Abbreviation: WAP, weeks after planting.
Archives of Agronomy and Soil Science | 2015
Vahid Barati; Hossein Ghadiri; Shahrokh Zand-Parsa; N. Karimian
Experiments were conducted to determine barley cultivars (Yousefsix-rowed and Nimrouztwo-rowed) response to different water and nitrogen (N) regimes at Fars Agricultural Research Center using split-split-plot design. There were three levels of water regimes (full-irrigation (I100), 75% and 50% of I100: I75 and I50, respectively) in 2010. Rainfed treatment (I0) was included in 2011. Three N levels (0, 60 and 120 kg ha−1) were used. Grain and biomass water use efficiencies (WUEg and WUEb, respectively) were positively affected by N supply. The I75 improved WUEg and WUEb by 17% and 20% as compared to I100, respectively. Two-rowed cultivar showed higher WUEg and WUEb than six-rowed. Nitrogen use efficiency (NUE) was negatively affected by water stress and N fertilization. The highest grain yield was achieved by 120 and 60 kg N ha−1 under I100 and drought stress conditions, respectively. Two-rowed cultivar showed significantly higher NUE and grain yield than six-rowed cultivar under I50 and I0; by contrast, six-rowed cultivar had similar or higher performances in terms of these traits under I100 and I75. This study showed that optimizing irrigation and N rates and selection of suitable cultivars in semi-arid Mediterranean climate might increase NUE, WUE and produce economic grain yield.
Archives of Agronomy and Soil Science | 2010
Mohsen Edalat; Hossein Ghadiri; Shahrokh Zand-Parsa
Crop water stress index (CWSI) is a valuable index for quantifying water stress. To evaluate the CWSI of corn under redroot pigweed densities, a study was conducted at Shiraz University during 2008. The main objective was to develop baseline equations, which could be used to calculate CWSI for monitoring water status of corn under weed competition. Six weed densities and three irrigation treatments were selected. Six lower baselines with different slopes and intercepts between Tc − Ta (canopy-air temperature difference) and VPD (vapor pressure deficit) were fitted for each weed density. With increasing redroot pigweed density, lower baseline slope and its intercept were significantly increased due to more limitation in water. Monthly and seasonal mean CWSI were lowest in weed free and T2 treatment (high water supply) and highest in 80 weeds m−2 and T3 (water stress) treatment, which could show higher competition between corn and redroot pigweed at higher weed densities. An average of mean seasonal CWSI (about 0.12) in weed free and T2 treatment produced the maximum kernel yield. Predicting yield response to seasonal mean CWSI is important in developing strategies for farmers, and researchers for irrigation management under limited water conditions.
Archives of Agronomy and Soil Science | 2017
Vahid Barati; Hossein Ghadiri
ABSTRACT Field experiments were conducted to investigate the effects of irrigation regimes and N levels on assimilate remobilization of two barley cultivars (Yousefsix-rowed and Nimrouztwo-rowed) in 2011 and 2012. There were three levels of water regimes (full irrigation (I100), 75% and 50% of I100: I75 and I50, respectively) in 2011. Rain-fed treatment (I0) was included in 2012. Three N levels (0, 60, and 120 kg ha−1) were used. Grain yield and assimilate remobilization decreased by severe water stress (I0), however, the reduction of them were intensified by N fertilizer application. The N remobilization was negatively affected by N fertilization and water stress. The two-rowed showed higher N remobilization (10.7%) and contribution of N remobilized to N content of grain (5.8%) than the six-rowed. The two-rowed cultivar showed significantly higher assimilate remobilization and grain yield than the six-rowed under I50 (26.3% and 6.5%, respectively) and I0 (48.7% and 17.1%, respectively), while the six-rowed had similar or higher performances in terms of these traits under I100 and I75. This study showed that optimizing irrigation and N rates (decrease N level with increasing water stress) and selection of the suitable cultivars (Nimrouztwo-rowed) might increase assimilate remobilization and consequently grain yield under drought stress conditions.
Crop Protection | 2010
Ehsan Bijanzadeh; Hossein Ghadiri; Ali Behpouri
Plant Knowledge Journal | 2012
Ruhollah Naderi; Hossein Ghadiri; N. Karimian
Archive | 2012
Reza Moradi Talebbeigi; Hossein Ghadiri
Australian Journal of Crop Science | 2011
Mohsen Edalat; Hossein Ghadiri; Habiballah Hamzehzarghani; Seyed Abdolreza Kazemeini
Maydica | 2018
Nahid Jafarikouhini; Seyed Abdolreza Kazemeini; Hossein Ghadiri; Mark Lagri mini
Italian Journal of Agronomy | 2018
Reza Moradi Talebbeigi; Seyed Abdolreza Kazemeini; Hossein Ghadiri; Mohsen Edalat