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Showing 1 to 20 of 77 for “"N fertilization"”.
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Long-term n fertilization affects soil bacterial communities in agronomic fields
… nutrient cycling. In turn, long-term nitrogen fertilization changes soil physical and chemical properties and thus influences soil microbiomes. In-depth understanding of the long-term nitrogen fertilization effects on soil microbial communities is critical for improving fertilization practices …
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Use of 15N-labeled anhydrous NH3 to determine the efficiency of fall N fertilization for corn production
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2021-05-01
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Interactive effects of n fertilization rate, cultivars and planting date under climate change on maize (zea mays l.) yield using crop simulation and statistical downscaling of climate models
Generating new information using traditional agricultural trials which are expensive is not sufficient to meeting novel agro-technologies. Planting date (PD), low soil fertility and climate change influences maize (Zea mays L.) growth and yield. Local-scale impacts of future climate change (CC) and …
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Forage Systems for the Southeastern United States: Crabgrass and Crabgrass-Lespedeza Mixtures
… the effects of lespedeza seeding rate and N fertilization treatment on the yield, botanical composition, and nutritive value of crabgrass-lespedeza mixtures. A greenhouse study was conducted using three soil pH levels of 4.8, 5.5, and 6.3. Crabgrass germination and root and shoot yields were …
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Relationships among Root Traits, Nitrogen Availability, and Mineral-Associated Organic Carbon
… investigates how plant root traits, nitrogen (N) fertilization, and cover cropping influence soil organic carbon (SOC) and MAOC. In the first chapter, a greenhouse experiment with 30 herbaceous plant species found that non-N-fixing plants exhibited stronger positive correlations with MAOC compared …
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The influence of long-term nitrogen fertilization on symbiosis and metabolism in the legume-rhizobium mutualism
… we demonstrated that long-term nitrogen fertilization caused the evolution of less-mutualistic rhizobia. Here, I used two approaches to investigate the influence of long-term nitrogen fertilization on symbiosis and metabolism in Rhizobium. First, I used 63 of our previously isolated …
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Optimizing yield and crop nitrogen response characterization by integrating spectral reflectance and agronomic properties in sugarcane and rice
… production. The best management practices for N fertilization is always challenging due to its dynamic system in the nature. Remote sensing has emerged as one of the most useful technologies in modern agriculture for non-invasive monitoring of plant N status. The objectives of this research were …
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Effect of Forage Stand Termination Method and Fertilization History on Greenhouse Gas Emissions, Nutrient Supply Rates, and Soil Carbon Dynamics
… not fertilized on an annual basis, nitrogen (N) fertilization is often used to revitalize declining stands or for grass seed production. Once a stand is ready to be terminated, typically either a combination of tillage and herbicide or herbicide alone is used to kill the vegetation. Termination …
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Assessment of stockpiling methods to increase late summer and early fall forage biomass
… value of three types of tall fescue with N fertilization (endophyte infected (E+), endophyte-free (E-), and novel endophyte (MaxQ)) and four species of native warm-season grasses without N fertilization (switchgrass (Panicum virgatum L.), big bluestem (Andropogon gerardii Vitman), …
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Perennial energy crops on riparian buffers affect nitrogen cycling microbial communities
… though we understand the relationship between N fertilization and energy crop biomass production, our understanding of the interaction between the soil N cycle and bioenergy crop production is limited. The objective of this study was to determine the effects of perennial energy crop management …
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Nitrogen Rate and Source Effects on Biomass Yield of Teff Grown for Livestock Feed in the Mid-Atlantic Region
… and 2010 to determine the effect of nitrogen (N) fertilization rate and source on the yield, nutritive value, and nitrate content of teff. Nitrogen (N) was applied at 0, 45, 90, and 135 kg plant available N ha-1 as a single application of either ammonium nitrate (AN) or broiler litter (BL) at …
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Restoration of nitrogen and carbon cycling in an Appalachian mine spoil
… was to determine the extent to which inorganic N fertilization, native topsoil replacement, or whole-tree wood-chip amendment affected the restoration and reforestation of an Appalachian mine-soil system through changes in C and ~ dynamics. Eighteen concrete tank lysimeters filled with mine spoils …
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Evaluation of quickstand bermudagrass fertilized with two rates of nitrogen and grazed by sheep at different stocking rates in a temperate environment
… environment. Four stocking rates and two N fertilization rates (4 x 2 factorial) were replicated three times on .11-ha paddocks. Paddocks were continuously stocked with two, four, six, or eight lambs (light, moderate, heavy, and very heavy stocking rate, respectively) in grazing trial 1. …
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EFFECTS OF NITROGEN DEPOSITION ON BOREAL BOGS: A THREE YEAR NITROGEN FERTILIZATION AND TRACER EXPERIMENT
… can be affected, but the net effects of N fertilization are complex and unclear. A three-year N fertilization experiment with 15N double labeled 15NH415NO3 as a tracer was designed to study the effects of increasing N deposition on various N pools (including microbial communities, moss, …
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Crop Rotations for Sustainable Intensification
… in winter crops and under low to moderate N fertilization levels. Diversified crop rotations that included non-cereal crops, catch crops, and spring-sown crops improved NUE, yield stability, and the productivity of winter wheat and winter oilseed rape. In contrast, cereal-dominated rotations …
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Methane Emissions and Ammonia Volatilization from Drill-Seeded, Delayed-Flood Rice on a Silt-Loam Soil in Arkansas
… CH4 emissions as influenced by nitrogen (N) fertilization (i.e., optimal N and no N) in 2011, and previous crop [i.e., soybean (Glycine max L.) or rice] and cultivar (i.e., semi-dwarf, standard-stature, and hybrid) in 2012, and to assess the impact on grain yield of ammonia (NH3) …
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Managing Continuous Corn for Yield and Soil Productivity
… tillage system affect the response of CC to N fertilization. Across four N fertilizer rates and five Mollisol environments with abundant rainfall, grain yield with no till improved as residue removal increased, and equaled that of the chisel plow tillage system when all residue was removed. …
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Development of Nitrogen rate Recommendations for No-till Dryland Grain Sorghum in Virginia
… and ammonium) on sorghum response to applied N fertilization. Multi-location field studies were conducted over three years. A range of N treatments of various starter-band and side-dress N rates were applied. The experimental data indicate that an optimum rate of N fertilization depends on …
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Use of Stable Isotopes to Trace the Fate of Applied Nitrogen in Forest Plantations to Evaluate Fertilizer Efficiency and Ecosystem Impacts
… to urea. Mean NH3 volatilization after spring fertilization ranged from 4% to 26% for EEFs versus 26% to 40% for urea, and 8% to 23% for EEFs versus 29% to 49% for urea in summer. Chapter 3 results showed an increase in timing and development of foliage in fertilized compared to unfertilized …
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Quality and yield of tall fescue (Festuca arundinacea Schreb.) as affected by season, legume combinations and nitrogen fertilization
… quality. The effect of stockpiling date and N fertilization on yield, yield distribution, and chemical quality of fescue in winter were studied. The total digestible nutrient (TDN) content of tall fescue in summer was variable between years (35.3% in 1975 and 52.2% in 1976). Alfalfa (54.9% TDN) …
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