abas soleymanifard; mani mojaddam; shahram lack; mojtaba alavi fazel
Abstract
Application of Azotobacter as a substitute or suitable companion of nitrogen chemical fertilizer with higher efficiency of inputs in safflower plant as a plant adapted to different climates is one of the sustainable agricultural strategies. Therefore, in order to study the effects of Azotobacter chroococcum ...
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Application of Azotobacter as a substitute or suitable companion of nitrogen chemical fertilizer with higher efficiency of inputs in safflower plant as a plant adapted to different climates is one of the sustainable agricultural strategies. Therefore, in order to study the effects of Azotobacter chroococcum and nitrogen fertilizer on nitrogen uptake, grain nitrogen and straw, nitrogen efficiency indices and grain yield of six safflower genotypes under rainfed conditions, a factorial experiment has been conducted based on a randomized complete block design with three replications in during growing season of 2015-2016 and 2016-2017 at the Agricultural Research Station Sarableh in Ilam Province. Experimental factors inoculate a combination of seed inoculation with Azotobacter chroococcum with urea chemical fertilizer application at four levels (non-inoculated with Azotobacter chroococcum and urea as control, seed inoculation with Azotobacter, inoculation with Azotobacter chroococcum + 50 Percent N from urea, and inoculation with Azotobacter chroococcum + 100% N from Urea) and six genotypes of safflower. The combined analysis of variance for two years show that the main effects of nitrogen source and genotype and also year× nitrogen source have had significant effect on all of the measured traits and nitrogen efficiency indices. The results from comparison of means show that inoculation treatment with Azotobacter chroococcum + 50% nitrogen fertilizer had higher Nitrogen use efficiencythan 100% nitrogen fertilizer use, with no significant difference in grain yield between the two treatments. Sina genotype with the highest grain yield and nitrogen use efficiency, compared to other genotypes, is more desirable for cultivation in rainfed conditions of the region.
Parastoo Pahlevanloo; Majid Rahimizadeh; Mohammad Reza Tookalloo
Abstract
In order to investigation nitrogen use efficiency in intercropping of maize and soybean an experiment was conducted with split plot arrangement in a randomized complete block design with three replications in 2012 in Bojnourd (North Khorasan). Nitrogen fertilizer rate was as a main factor at three levels ...
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In order to investigation nitrogen use efficiency in intercropping of maize and soybean an experiment was conducted with split plot arrangement in a randomized complete block design with three replications in 2012 in Bojnourd (North Khorasan). Nitrogen fertilizer rate was as a main factor at three levels (control, 50 percent lower than recommended N rate, recommended N) and five mixing ratio treatments were (0:100, 50:50, 66:33, 100:0 and 100:25 corn and soybean) as subplots within the main plots. Results indicated that nitrogen and intercropping system had significant effect on yield and nitrogen use efficiency. Nitrogen fertilizer increased nitrogen use efficiency, economical yield and land equivalent ratio. The highest nitrogen use efficiency, economical yield and land equivalent ratio were obtained in mixture of 50:50 corn and soybean under nitrogen recommended rate that 131, 16 and 21 percent higher than sole cropping, respectively. Therefore, intercrops could be used for more efficient use of N on a per land area basis.