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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 33 for “"Nitrogen rates"”.
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Potential enzyme activities in soils as affected by perennial cropping and nitrogen rates in central Iowa
… of soybeans and maize that is heavily reliant on nitrogen (N) fertilizers. In contrast, perennial biomass crops are gaining attention for their notable environmental benefits, such as efficient nutrient cycling, enhanced water quality, reduced soil erosion, increased soil organic carbon (C), and …
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Effect of Nitrogen Rates, Planting Dates, and Irrigation Regimes on Potato Production in the Eastern Shore of Virginia
… was to evaluate the effect of planting dates, nitrogen (N) rates, and irrigation regimes on potato production. Two comprehensive studies were conducted between February and July 2022 and 2023. The objective of the first study was to evaluate the effect of N rates, planting dates, and soil …
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Nitrogen fertilization, nitrogen and nicotine content of burley tobacco
… were conducted to study the effect of rates and time of nitrogen application on growth, nitrogen and nicotine contents of leaves and stalks of Burley 21. Rates of nitrogen used were 0, 75, 150 and 225 pounds per acre. Nitrogen was applied as preplant and/or as post plant applications. …
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Effects of Reduced Early Post-Sprigging Nitrogen Application on Bermudagrass Sprig Establishment
… week period. We hypothesize that the quantity of nitrogen applied is in excess and that similar 8 to 10 week grow-in can be achieved with less nitrogen especially during the first 4 weeks when there are few plants per unit area. Three interrelated studies were conducted. A "field trial", consists …
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Evaluating the potential of aerial remote sensing in flue-cured tobacco
… for separating flue-cured tobacco varieties and nitrogen rates. Secondly, develop hyperspectral indices and/or machine learning classification models capable of detecting Phytophthora nicotianae (black shank) incidence in flue-cured tobacco. In 2017, UAV-acquired ENDVI surveys demonstrated the …
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Genetic, agronomic and compositional characterization of brown midrib sweet sorghum lignocellulosic biomass for ethanol production
… for ethanol production. ^ Additionally, a nitrogen experiment was conducted to study the effect of four nitrogen rates on biomass traits of nine sorghum varieties, as lines and hybrids with and without brown midribs, a sweet and a photoperiod sensitive cultivar and a maize hybrid. Nitrogen …
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Interactions of nitrogen, chlorine, and sulfate in the growth of burley tobacco
… experiment was conducted to study the effect of rates of nitrogen and muriate and sulfate of potash upon the growth, chemical composition, and quality of the Burley 21 variety of tobacco. Rates of nitrogen applied were 75, 150, 225, and 300 pounds per acre. The muriate and sulfate sources of …
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Canopy, microenvironment, and nitrogen effects on summer recovery of tall fescue
… fescue in response to mowing managements and nitrogen rates in spring that created different canopy structures was studied. In early spring, 50 and 160 kg/ha of N were applied. Mowing managements were: clipping at 4 or 8 cm biweekly, monthly, and in late June. In late June all 6 treatments …
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Nitrogen Behavior and Uptake by Corn as Affected by Time of Application, Nitrapyrin, and Supplemental Winter Heat
… and 55 days at 15 C in the winter 1978-1979. Nitrogen rates ranged from 0 to 252 kg/ha and 0 to 336 kg/ha in 1977-1978 and 1978-1979, respectively. Nitrapyrin was applied only in 1978-1979 and ranged from 0 to 1.12 kg/ha. Laboratory studies were also conducted to relate a degree day term …
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Influence of nitrogen fertilization and leaf management on nitrogen use efficiency and agronomic performance of mammoth cultivars of flue-cured tobacco
… Virginia to determine the influence of nitrogen rate on nitrogen use efficiency and its components on two mammoth cultivars and a conventional cultivar. Experiments were also conducted to determine the effects of leaf number, time of topping, and nitrogen rate on yield, quality, and …
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Some physiological responses of two grasses as influenced by temperature, light, and nitrogen fertilization
… conducted to study the effects or temperature, nitrogen, and light intensity on the growth and physiological effects on Tifgreen bermudagrass, Cynodon dactylon (L) Pers., and Cohansey bentgrass, Agrostis palustris Huds. Each of the grasses was included in a field experiment to study the …
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The sustainability of tropical maize as an alternative biofuel or silage crop
… accumulation of sucrose in the stalk and a lower nitrogen fertilizer requirement. Our objective was to evaluate the impact of sustainable practices such as conservation tillage, cover crops, and reduced nitrogen fertilizer application on tropical maize as a biofuel, biomass, or animal feed crop. …
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Exploration of Physiological and Molecular Responses to Precipitation Extremes in Soybean and Nitrogen Fertility in Wheat
… In addition, increased application of synthetic nitrogenous fertilizers to meet the global food demand has led to environment related issues. Therefore, with a goal of understanding mechanisms of flooding and drought tolerance in soybean and nitrogen-use-efficiency in wheat, we explored their …
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Yield and nitrogen uptake of broccoli (Brassica oleracea L. var italica) and soil nitrate status as influenced by rate and timing of nitrogen application
… this study were to amend the current recommended nitrogen rates for broccoli production, and to measure plant N uptake and soil nitrate status throughout the growing season in order to develop an efficient N fertilization program for this emerging industry. A preliminary study in 1985 indicated no …
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Time And Rate Of Nitrogen Fertilization Influence Maize Nitrogen Use Efficiency And Soil Enzyme Activity
… and spring) and split applications of differing nitrogen (N) rates for maize (Zea mays L.) on an irrigated Hubbard-Mosford loamy sand complex at Becker, a non-irrigated Normania loam soil at Lamberton, and a non-irrigated Nicollet clay loam soil at Waseca, MN. Fall and spring treatments were …
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Yield response of continuous corn to residue removal, tillage, and nitrogen rate
… may require adjustments in tillage systems and nitrogen rates. Research was conducted at DeKalb, Monmouth, Urbana, and Perry, Illinois to examine the response of three residue removal rates (full, partial, and none) and two tillage treatments (no-till and conventional (chisel) tillage) to four N …
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Quantifying the agronomic and water quality tradeoffs of fertilizer management with multiobjective evolutionary algorithms
… wide uncertainty bounds and high maximum pro fit nitrogen rates, the optimization results support that sidedress fertilizer applications from 20 to 50 days after planting not only maximize profit for injection and surface broadcast but also reduce outcome sensitivity to the placement method and …
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Pre- and Postharvest Practices for Optimizing the Postharvest Quality of Cut Sunflower, Dahlia, and Delphinium
… dahlia. Experiments investigated the effects of nitrogen fertilization rate on delphinium 'Guardian Mix' and the effects of deficit irrigation on delphinium 'Guardian Blue.' 'Guardian Mix' plants produced marketable cut stems at nitrogen rates as low as 50 mg/L. Deficit irrigation did not change …
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The development of vegetable production technology for small farm families
… growing season with normal amounts of rainfall. Nitrogen applications of 84 kg/ha were most cost-effective, with higher rates found beneficial for irrigated plantings on lighter soils. Plant populations of 13,450 plants/ha produced similar yield and net economic returns as populations of 17,930 …
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Annual forage cropping-systems for midwestern ruminant livestock production
… aestivum</em> L.) grain harvest, at two nitrogen application rates 56 and 112 kg ha-1 . The first set of crops were C4 summer annuals seeded within two weeks of wheat grain harvest and included, brown mid-rib (BMR) sorghum sudangrass, pearl millet, foxtail millet, and tef. The second set …
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