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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Commercial fertilizer"”.
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Optimum Combinations of Crops and Commercial Fertilizer on Palouse Wheat-Pea Farms
Made available in DSpace on 2014-12-04T21:48:08Z (GMT). No. of bitstreams: 1 6000145.pdf: 5922496 bytes, checksum: 221fa34090318b65fa86065d3f4c0f14 (MD5) Previous issue date: 1959
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Availability and Surface Runoff of Phosphorus from Compost Amended Mid-Atlantic Soils
… the effects of compost, poultry litter and commercial fertilizer on surface P runoff from a Fauquier silty clay loam that had received compost, poultry litter, or commercial fertilizer for 5 years. Organic amendments with higher concentrations of Fe, Al, and Ca had lower relative P …
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The economic potential of establishing a poultry litter handling industry
… that have the capacity to absorb more litter for fertilizer and animal feed (litter-deficit areas). A linear programming feed cost minimization model was used to estimate the value of litter as a feed for beef stockers and beef cows. The value of litter in beef and stocker rations were estimated …
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Financial costs and economic tradeoffs of alternative manure management policies on dairy and dairy/poultry farms in Rockingham County, Virginia
… with each farm substituting poultry litter for commercial fertilizer. Potential field-level nutrient losses estimated by EPIC, a soil/plant growth simulation model, indicate the highest nitrogen losses on grass hay and pasture and the highest phosphorus losses on no-till com. The highest …
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Bird perches and soil amendments as revegetation techniques for landslides in Puerto Rico
… leaves, Cyathea fronds, forest soil, and commercial fertilizer) in five recent (<5 yr) landslides to determine soil and plant responses. Soils were sampled repeatedly over one year to measure soil chemical and physical properties, and I sowed seeds of two common landslide colonists …
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INITIAL IMPACTS OF DIFFERENT FERTILIZERS ON IMPROVED EAST TEXAS EQUINE PASTURES
… assessed the effects of organic and inorganic fertilizer treatments on improved Bermudagrass (BG) and other vegetation (OTH) in overgrazed equine pastures at the Stephen F. Austin State University Equine Center. Treatments included equine manure (H), broiler poultry litter (P), and a commercial …
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Managing ground water contamination from agricultural nitrates
… of land use restrictions, bans on purchase of commercial fertilizer, and imposition of standards on loadings to ground water. These reductions are achieved, however, at higher costs in terms of reduced net returns. Study results indicate that a wide range of policy options exist for reducing …
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Switchgrass Cultivar, Harvest Frequency, Fertilizer Source, and Irrigation Effects on Near-Surface Soil Properties in West-Central Arkansas
… frequency (1-cut and 2-cut systems per year), fertilizer source (poultry litter and commercial fertilizer), and irrigation management (irrigated and non-irrigated). Effects on soil properties were assessed on a Leadvale silt loam (fine-silty, siliceous, semiactive, thermic, Typic Fragiudult) at …
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SOIL PHOSPHORUS AND NITROGEN EXPORT AND RETENTION IN RAINFALL RUN-OFF FROM MANURED LANDSCAPES
… rate manure application with no setbacks, and a commercial fertilizer (control) application zone which only received annual synthetic fertilizer applications. The manured zones received manure applications in the spring of 2019 and 2021. Rainfall simulations were conducted in each micro-watershed …
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Phosphate Reactivity in Long-Term Manure Amended Soils in the Ridge and Valley of Virginia
… litter (broiler and layer), dairy manure and commercial fertilizer applications. Soil chemical properties were measured with various extractions, while soil solution was measured in samples equilibrated at field capacity. Inorganic material was analyzed using scanning electron microscopy with …
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Effect of Form and Amount of Phosphorus and Phytase Supplementation on Phosphorus Utilization by Ruminants
The use of animal manures to replace commercial fertilizer has increased the economic and environmental sustainability of agriculture. However, this practice has resulted in excess P being applied to the soil in some areas. Excess P may run-off into surface water and leach in the ground, causing …
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Phosphorus runoff potential of different sources of manure applied to fescue pastures in Virginia
… management intensive rotational grazing. Commercial fertilizer TSP and manure application increased runoff TP concentration from 0.146 mg/l to 0.245 mg/l and DRP concentration from 0.105 mg/l to 0.183 mg/l. Runoff P did not differ between organic or inorganic P treatments, possibly due to …
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Essays on Malawian agriculture: Micro-level welfare impacts of agricultural productivity; profitability of fertilizer use; and targeting of fertilizer subsidy programs
… essay estimates the profitability of inorganic fertilizer use in maize production using fixed effects and multilevel models. The study finds that fertilizer use is generally unprofitable at prevailing market conditions when one assumes farmers incur positive transaction costs in the use of …
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Salmonella Internalization From Contaminated Seeds or Irrigation Water in Greenhouse Tomatoes
… for its ability to survive in three concentrated fertilizer stock solutions and 1.6% diluted solutions of the fertilizer. Fertilizer sample CF-S was a stock solution of commercial 20N-4.4P-16.6K fertilizer, US-S was a mix of 11.3 kg UltraSol, 4.5 kg Epsom Salts, and 2.3 kg 0N-0P-43.2K in 114 L …
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Manure management decision-making of cattle-feed growers in northeastern Colorado
… as a waste disposal issue, as an important fertilizer resource, or both. This distinction places manure management in the overlap between environmental sociology and natural resource sociology. The study identifies factors related to how farmers choose fields on which to apply manure, the …
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Hot spots in ammonium nitrate
… (AN) is commonly used as an explosive and as a fertilizer. In both roles it is provided as prills or pellets, approximately spherical and a few millimetres in diameter. The microstructures of several commercially-available AN compositions were investigated using environmental scanning electron …
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IMPACT OF CONVENTIONAL AND PRECISION CATTLE MANURE APPLICATION METHODS ON HORMONE CONCENTRATIONS AND ACTIVITIES IN SURFACE WATER AND SOIL
… each were set up. The three treatments were 1) commercial fertilizer (no manure), 2) conventional, also termed traditional, cattle manure application at constant rate with no setbacks from watershed basin centers, and 3) precision cattle manure application at variable rate with no manure applied …
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Economic Feasibility of Sub-surfaced Poultry Litter
<p>Livestock producers routinely spread fertilizer or broadcast poultry litter to improve forage production. With poultry litter widely available across the Southeastern United States and a cheaper source of plant nutrition than fertilizer when proximal to application sites, the novel application …
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Ammonia Recovery from Digester Centrate with Electrochemical Membrane Systems: Mechanism, Performance, and Application
… the recovered ammonia, was used to prepare fertilizers to support the growth of a model plant Arabidopsis thaliana. It was observed that A. thaliana grown on the MES generated fertilizer amended with extra potassium, phosphorus, and trace elements showed similar appearance to the control …
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Development of novel fertilizer manufacturing processes using human urine
… including topics such as source-separation, fertilizer effectivity, public perception, and logistics. Another important aspect is the urine treatment method and how resources are recovered. This is because urine is 97% water, making the logistics of using urine as a fertilizer challenging. In …