نتایج جستجو برای: n and nh4
تعداد نتایج: 16945097 فیلتر نتایج به سال:
The mineralization of urea fertilizer mostly regulates the nitrogen dynamics in soil. A laboratory-scale study was conducted to compare two tropical soil series incubated with either liquid (LU) or granular (GU) at 0, 300, 400 500 mg/kg soils samples used experiment were Bungor and Selangor which have a sandy clay loam texture, respectively. NH4+-N, NO3−-N concentration measured for four weeks ...
In the seasonally stratified Gulf of Aqaba Red Sea, both NO 2 release by phytoplankton and NH þ 4 oxidation by nitrifying microbes contributed to the formation of a primary nitrite maximum (PNM) over different seasons and depths in the water column. In the winter and during the days immediately following spring stratification, NO 2 formation was strongly correlated (R 2 = 0.99) with decreasing ...
Anthropogenic nitrogen (N) emissions to the atmosphere have increased significantly the deposition of nitrate (NO3-) and ammonium (NH4+) to the surface waters of the open ocean, with potential impacts on marine productivity and the global carbon cycle. Global-scale understanding of the impacts of N deposition to the oceans is reliant on our ability to produce and validate models of nitrogen emi...
Little information is currently available concerning temporal changes in nutrient transport following the addition of manure to cropland areas. This study was conducted to measure nutrient transport in runoff as affected by tillage and time following the application of beef cattle or swine manure to a site on which corn (Zea mays L.) was grown. Rainfall simulation tests were initiated 4, 32, 62...
To test for electrogenic transport of ammonium ions in straight proximal renal tubules, isolated perfused tubules have been exposed to peritubular ammonium ions during continuous recording of cell membrane potential. As a result, 20 mmol/liter NH4+ leads to a rapid, reversible depolarization of the cell membrane by 9.0 +/- 0.3 mV (N = 86). This depolarization is not significantly affected by 10...
ABSTRACT Background and objective: Milk and dairy industries wastewater are considered the most polluted effluents, and if discharged without treatment into the environment, can cause serious environmental problems. In this study, effects of aeration time and lime coagulant on SBR efficiency were investigated. Materials and Method: Two Parallel reactors with a volume of 20 L w...
*Correspondence: Kazuo Isobe, Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan e-mail: akisobe@ mail.ecc.u-tokyo.ac.jp Topography affects the soil physicochemistry, soil N dynamics, and plant distribution and growth in forests. In Japan, many forests are found in mountainous area...
A NaCl-modified zeolite was used to simultaneously remove nitrogen and phosphate from biogas slurry. The effect of pH, contact time and dosage of absorbants on the removal efficiency of nitrogen and phosphate were studied. The results showed that the highest removal efficiency of NH4+-N (92.13%) and PO43--P (90.3%) were achieved at pH 8. While the zeolite doses ranged from 0.5 to 5 g/100 ml, NH...
dissolved organic nitrogen (don) is an important constituent of dissolved organic matter (dom). it has a considerable effect on total dissolved soil nitrogen and it is very important as a nitrogen source of many aquatic and terrestrial ecosystems. dissolved inorganic nitrogen, which is another form of total soil dissolved nitrogen, includes no3, no2 and nh4, which is very important for plant nu...
تحقیق بر روی گیاهان چند ساله درختی درشرایط کنترل شده نسبت به گیاهان یکساله ویا دو ساله مشکل تر است . این آزمایش بر مبنای تأثیر متفاوت n-nh4+وn-no3- بر رشد و اندازه عناصر پرمصرف در نهالهای درخت سیب رقم گلدن دلیشس در شرایط رژیمهای مختلف غذایی ای استفاده شده است که بغیر از یونهای n-nh4+وn-no3- تمام ماکروالمانها ومیکروالمانهای آنها تقریبا ثابت و درحد متعارف گیاه منظور گردیده و تنها تفاوت نسبت و مقا...
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