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Dadnia M.R.,Islamic Azad University | Asgharzadeh A.,Islamic Azad University | Asgharzadeh A.,Agricultural Research Organization | Zadeh S.H.,Islamic Azad University
Research on Crops | Year: 2010

Wheat (Triticum aestivum L.) yields are reduced by nutrient stress in many countries worldwide. The main objective of this study was to determine whether modifications to currently recommended crop management practices could improve wheat yield for nutrients uptake. Field trials were conducted during 2009 in Ahwaz Agricultural Research Field. Crop establishment and other plant characteristics were measured to help understand the basis of improved performance and to identify potential diagnostic traits. Management factors included (i) A. brasilense × A. lipoferum, A. brasilense × A. irakiens and A. lipoferum × A. irakiens and (ii) inorganic fertilizer (N) at 75 and 100% levels. Control treatments represented recommended practices and gave yields of 3.9 t/ ha, averaged across all environments. Considering main effects, A. brasilense × A. lipoferum gave the highest yield response (26.98%) and approximately equivalent levels of N, suggesting that inorganic fertilizer provided growth factors in addition to nutrient content. A. brasilense × A. irakiens and A. lipoferum × A. irakiens increased yield about 23.01 and 20.74% at 75 and 100% N applied than control treatments, repectively. Improved performance in response to inputs was generally associated with better stand establishment and with significant increases in plant height, grain per unit area and aboveground biomass. The possibilities of realizing the benefits of applied inorganic matter and bacterial treatments through briefly discussed. Source


Dadnia M.R.,Islamic Azad University | Asgharzadeh A.,Islamic Azad University | Asgharzadeh A.,Agricultural Research Organization | Nejad M.M.,Islamic Azad University
Research on Crops | Year: 2010

Response to fertilizer is a function of several factors including weather, soil condition, Previous year yield level and the actual amount of fertilizer and bacterial species applied. The main objectives of this paper were to evaluate interaction among Azotobacter, Pseudomonas, Azospirillum and fertilizer can explain variability in long term grain yield and fertilizer response to assess if demand for N fertilizer of winter barley (Hordeum vulgare L.) improves the yield. Data were collected from experiment located at Ahwaz Research Field. The experimantel design was a randomized complete block with four replications. Azotobacter chrococcum, Azospirillum lipoferum and Pseudomonas utiida treatments that consisted of annual application of N (75 and 100%) fertilizer were included although selected treatments. The practical significant differences among bacterial treatments showed that yield components affected by these treatments such as A. lipoferum × P. utida, utida × A. chrococcum and A. lipoferum × A. chrococcum increased yield 27.5, 21.7 and 17.8%at N applied, repectively. It could theoretically adjust preplant or in-season topdress N fertilizer rates by considering the previous year yield level and the degree of response to N. Source


Dadnia M.R.,Islamic Azad University | Asgharzadeh A.,Islamic Azad University | Asgharzadeh A.,Agricultural Research Organization | Poor S.L.,Islamic Azad University
Research on Crops | Year: 2010

The topic of how to decrease environmentally adverse effects of agriculture without losing too much crop yield is an important issue.In this respect, nitrogen uptake was studied from a soil (land fallowing is not practised) treated with three types of organomineral bacterial root development [Pseudomonas utida, Azospirillum lipoferum and Azotobacter chrococcum, respectively]. Wheat (Triticum aestivum L. cv. chamran) yield parameters were obtained and the alveographic assays showed that the P. utida had a great potential of being used, at least on the wheat variety tested and under the pedoclimatic conditions prevailing in the study area.this respect, application of P. utida gave a significant increase in grain yield, number of grains per spike, tillers/m2 and 1000-seed weight of 22.94%, and A. lipoferum, A. chrococcum increased these parameteres about 19.92 and 17.41% at 75 and 100% N application, respectively. Source


Dadnia M.R.,Islamic Azad University | Asgharzadeh A.,Islamic Azad University | Asgharzadeh A.,Agricultural Research Organization | Khayat F.H.,Islamic Azad University
Research on Crops | Year: 2011

In response of wheat to low (90 kg/ha) and normal (120 kg/ha) N rate, A. chrococcum strains (15, 35 and 38) were applied in Ahwaz climatical conditions. A study was conducted to determine the effects of A. chrococcum strains for N supply in wheat (Triticum aestivum L.). The results showed that yield and other traits were affected by strains. Strain 38 increased wheat yield 31 to 37% at 90 and 120 kg N/ha than control treatments, respectively. Other strains had positive effect on yield and yield components, but this arising was lower than strain 38. The data showed that strains at low N rate had better performance than normal condition. Improved performance in response to inputs was generally associated with significant increases in plant height, grains/spike, and tillers/m2. These results suggest that the chemical composition of the three A. chrococcum strains notably influenced the soil properties and therefore the wheat yield parameters. Source


Dadnia M.R.,Islamic Azad University | Asgharzadeh A.,Islamic Azad University | Asgharzadeh A.,Agricultural Research Organization | Talavari F.,Islamic Azad University
Research on Crops | Year: 2010

Increasing grain protein in new higher-yielding cereal grains has recently received added attention due to protein premiums paid to farmers. Winter wheat (Trilicum aestivum L.) studies were conducted during 2009 to evaluate the effects of late-season foliar N applications on grain yield. Foliar applications of N were made at spiking stage (Leaves foliar and N application with irrigation water), seed foliar and control treatments, using urea at rates of 90 and 120 kg N/ha. A significant difference in increase in grain yield was observed for leaves foliar applications in this study. In the present experiment, significant differences were observed for nitrogen levels. Consistent increases from foliar N applications were observed for grain yield. Leaves foliar applied (4 litre liquid N/ha) increased grain over that N applied with irrigation water (4 litre liquid N/ha) by 5.36 and 4.12 t/ha, respectively. Seed foliar applied (2 litre for 100 kg seed) increased grain yield than control treatments by 4.81 and 3.54 t/ha, respectively. Late-season foliar N applications before or immediately following flowering may significantly enhance grain yield content and, thus, per cent protein in winter wheat. Source

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