نتایج جستجو برای: 1 maximum was 21179 mj ha
تعداد نتایج: 5595690 فیلتر نتایج به سال:
background and objectives: soybean is one of the plants that need large amounts of nitrogen for grain yield production. todays bio-fertilizers are considered as a best replacement for chemical nitrogen to increase soil fertility and sustained agricultural production. meanwhile, the use of soybean symbiotic bacteria and nitroxin, which contain the most effective nitrogen-fixing bacteria of the g...
A two-year study (2007-2008) was carried out to explore the effect of split application of nitrogen fertilizer on yield, dry matter and harvest index of Marfona potato cultivar in Isfahan Agricultural Research Center, Iran. A randomized complete block design with a split plot arrangement with three replications was used. The main plots were three levels of nitrogen (100, 200 and 300 kg ha-1) an...
برای بررسی اثرات تناوب های زراعی مختلف بر خصوصیات فیزیکی و شیمیایی خاک و عملکرد گندم دیم، سه مکان با سری های خاک سهند، رجل آباد و داراب واقع در منطقه مراغه- هشترود انتخاب گردید. در هر یک از این مکان ها چهار سیستم تناوبی کشت ممتد گندم (تیمار اول)، گندم- نخود (تیمار دوم)، گندم- آیش- گندم- گندم-گندم (تیمار سوم) و گندم- آیش (تیمار چهارم) به مدت پنج سال زراعی (1387-1382) اعمال شد. در خرداد ماه سال 1...
In the United States, corn (Zea mays L.) stover has been targeted for second generation fuel production and other bio-products. Our objective was to characterize sugar and structural composition as a function of vertical distribution of corn stover (leaves and stalk) that was sampled at physiological maturity and about three weeks later from multiple USA locations. A small subset of samples was...
Abstract To estimate energy use efficiency for sweet potato production in Bangladesh under subtropical climatic conditions, a study was conducted with 60 individuals (12 producers each variety) by using structural questionnaire. The results revealed that the majority of input consumed pre-harvest activities (22,313.55 MJ ha−1 or 90.85%), which fertilizer application (36.84%) and irrigation (35....
Due to the threat posed by spread of invasive plant species, there is an urgent need develop effective methods eradicating and managing their biomass. The aim study was examine selected plants in terms use for energy purposes find out whether they can be a raw material production second-generation biofuels. First, chemical compositions were determined. higher heating value (HHV) lower (LHV) als...
ArF excimer laser pulses (193 nm, 20 ns, 150 mJ) have been focused on a hydroxyapatite (HA) target in similar conditions to those normally used for thin film deposition. Fast intensified CCD images of HA laser ablation plumes have been taken in vacuum and under different water vapor pressures ranging from 0.01 mbar to 1 mbar. Images of HA ablation in vacuum have shown a plume freely expanding a...
this experiment was carried out as factorial based on randomized complete block design with four replications in 2011-2012 growing season. the experimental factors were selenium in four levels 0, 6, 12 and 18 g ha-1 and salicylic acid in three levels 0, 100 and 200 mg l-1. results showed that foliar application of selenium at rate of 12 and 18 g ha-1 decreased ion leakage by 11.6 and 18.8% comp...
in order to effects of sulfur and manure on grain yield, yield components, and some physiological traits of corn hybrid ksc 704 in calcareous soils of kermanshah province, a factorial experiment was carried out based on a randomized complete block design with three replications. sulfur fertilizer in four levels 0, 250, 500 and 750 kg ha-1 and manure in four levels 0, 4, 8 and 12 t ha-1 were app...
با توجه به وضعیت انرژی در جهان، کارایی و بهره وری کشاورزی در حال حاضر، بیش از گذشته وابسته به مصرف انرژی است. از این رو، آگاهی از منابع انرژی زراعی و الگوی مصرف آنها، برای سیاست گذاری های مناسب جهت توسعه سامانه های تولید محصول کارآمد، به ویژه در کشورهای پرجمعیت و در حال توسعه، بسیار مهم می باشد. هدف از این تحقیق، تعیین میزان انرژی های ورودی و خروجی و نیز ارزیابی اقتصادی تولید انگور در استان آذر...
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