Article InformationIn order to evaluate the effect of nitrogen bio-fertilizers on yield and yield and yield components of different maize (zea mays L.) cultivars a field experiment was conducted in Islamic Azad University of Boroujerd, Iran (at Isfahan region), during the growing seasons 2013-2014. The experiment was laid out in a split-plot design based on randomized block design with three replications. Treatments were different cultivars (Siloking, NS4015, Maxima and SC704) in main plots and nitrogen bio-fertilizers (Azotobacter, Nitroxin and Supernitroplus) with control in sub plots. The results reviled that the effect of cultivar treatmenton all traits was significant. Effect of N bio-fertilizer treatment was significant on stem weight, leaf weight, ear weight and biomass yield only. Interaction effect of them was significant on all traits excepting number of leaf per plant and ear weight. Application of nitrogen biofertilizers increased yield components of different cultivars of maize specially, for Siloking cultivar and Supernitroplus bio-fertilizer. Siloking cultivar with application of Supernitroplus biofertilizer had the highest plant height and leaf weight and Maxima cultivar with application of Nitroxin biofertilizer had the lowest plant height and leaf weight. However, NS4015 cultivars with non-application of any of N biofertilizer had the highest stem weight. Siloking cultivar had the highest number of leaf per plant and NS4015 cultivar had the lowest number of leaf per plant. Siloking cultivar had the highest all of the traits excepting stem weight. So, this cultivar was more useful than other cultivars for achieve to maximum production of foliage in Isfahan province. However Siloking cultivar with application of Supernitroplus nitrogen biofertilizer treatment had the highest biomass yield as foliage yield and we propose this treatment for maximum production of maize in Isfahan environmental condition.
Article InformationA field experiment was carried out in order to evaluate the effect of mycorrhiza and foliar application of Zn chelate on yield and yield components of maize (zea mays L.) SC600 cultivar under water stress condition in the faculty of agronomy and plant breeding, Islamic Azad University, Boroujerd Branch, Iran during the growing seasons 2013-2014. The experiment was laid out in a split-factorial design based on randomized block design with three replications. Treatments were different irrigation periods (7, 14 and 21 days) in main plots and Zn chelate and mycorrhiza (strain of Glomus intraradices) in two levels of use and non use of them as factorial in sub plots. Results showed that, the effect of water stress mycorrhiza and Zn chelate on all traits were significant. The interaction effect of water stress mycorrhiza and Zn chelate on all traits excluding number of grain per cob and biomass were significant. Also interaction effect of water stress ad mycorrhiza on number of grain per cob and 100 grain weight were significant only. However the interaction effect of water stress*Zn chelate and mycorrhiza*Zn chelate were significant on 100 grain weight and biomass yield respectively. The comparison of the mean values showed that 7 day irrigation period treatment with use of mycorrhiza and Zn chelate had the highest chlorophyll SPAD, number of row per cob, 100 grain weight, grain yield and harvest index but 21 day irrigation period without application of Zn chelate and mycorrhiza had the lowest of them. The maximum production of maize was recorded for normal irrigation as 7 day irrigation period and application of mycorrhiza and Zn chelate. It can be stated that with respect to the alleviating effects of mycorrhiza fungi under moderate drought stress on corn grain yield, these fungi can enhance corn water efficiency under drought conditions and hence increase corn yield. The combined effects of mycorrhiza fungi and Zn chelate can intensify the alleviating effects of mycorrhiza fungi on corn growth and production under water stress. Therefore, we can increase yield and yield components of maize by decrease of irrigation period and application Zn chelate as nutrient and colonization of corn roots by mycorrhiza fungi.
Article InformationA field experiment was laid out in order to evaluation of effects water stress on yield and yield components of wheat cultivars in Lorestan province in Islamic Azad University, Boroujerd branch, Iran at 2014. The experiment was laid out in a split-plot design based on randomized block design with three replications. Treatments were irrigation in five levels such as 1: four period irrigation after anthesis, 2: three period irrigation after anthesis, 3: two period irrigation after anthesis, 4: one period irrigation after anthesis and 5: control in main plots and three wheat cultivars (Shiraz, Pishtaz and Bahar) in sub plots. The results showed that, the effect of water stress, cultivar and interaction between them on all parameters were significant at 1% level. The height of Pishtaz cultivar was taller than other cultivars. The Pishtaz cultivar with one period irrigation after anthesis had the highest number of spike per square and Bahar cultivar with one period irrigation after anthesis had the lowest number of spike per square. However, 1000-grainwas decreased in water deficit treatment. However, the Pishtaz cultivar with four period irrigation had the highest plant dry weight and grain yield and Bahar cultivar non irrigation treatment after anthesis had the lowest plant dry weight and Shiraz cultivar in nonirrigation treatment had the lowest grain yield. The results showed that yield and yield components of common wheat decreased with increasing of water deficit and for increasing in grain yield of wheat complete irrigation are needed. However, Pishtaz cultivar had a highest grain yield and dry matter production. Then we can increase grain yield and production of wheat with cultivation of Pishtaz cultivar and avoid of water stress.
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