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Showing 1 to 20 of 30 for “"Nitrogen rate"”.
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Improving Early Season Sidedress Nitrogen Rate Prescriptions for Corn
Corn requires the most nitrogen (N) of cereal grain crops and N supply is correlated with grain yield. Canopy reflectance has been used to assess crop N needs and to derive optimum application rates in mid-season corn. Canopy reflectance has not been useful for N rate determination in early season …
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Effect of tillage system and nitrogen rate on tomato yield
… to evaluate the effects of tillage systems and nitrogen fertilizer rates on fresh market 'Pik Red' tomato (Lycopersicon esculentum Mill.) production were carried out at Blacksburg, Virginia (1981 and 1982) and at Carrasco and Jackson, Uruguay (1981-2). Two tillage systems were used: (a) …
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Dialing in the most corn-profitable and environmentally responsible nitrogen rate
Efficient nitrogen (N) management is essential for optimizing corn (Zea mays L.) productivity while minimizing environmental N losses in subsurface-drained continuous corn (CC) systems. This three-year study (2021 – 2023) at the Southwest Research and Outreach Center (SWROC) in Lamberton, Minnesota …
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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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Development of Nitrogen rate Recommendations for No-till Dryland Grain Sorghum in Virginia
… of this study were: (i) to determine the optimum rate of band-placed starter N fertilizer needed in combination with side-dress N applications to achieve economic grain yields, (ii) to investigate if pre-plant broadcast N applications are as efficient as band-placed plus side-dress N applications, …
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The influence of plant age and nitrogen rate on nutrient removal from the container medium solution
… of a container, however, has never been demonstrated. Mariogold, Tagetes erecta ‘Inca’ seeds were glasshouse-grown in 500 cc plastic pots containing 1 peat: 1 perlite (v/v) medium and fertilized daily with 200 ppm N as ammonium nitrate. Thirty, 35, 40, 45 and 50 day old plants were subjected to …
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Influence of nitrogen rate on corn grain yield, nitrogen use efficiency, and nitrate leaching on coarse-textured Minnesota soils
Nitrogen (N) is often the limiting nutrient in irrigated sandy soils. Nitrogen poses a threat to water quality in its nitrate form because it is easily leached through the root zone of the corn (Zea Mays L.) crop following rain and irrigation events. Leaching is enhanced in sandy soil conditions …
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Influence of nitrogen rate, harvest frequency, lower leaf management, and chemical topping on mammoth cultivars of flue-cured tobacco
… in 1987 and 1988 to determine the influence of nitrogen rate, harvest frequency, and time and number of basal leaf removal on several agronomic and chemical properties of a mammoth cultivar of flue-cured tobacco. The feasibility of chemically topping two mammoth cultivars was also investigated. …
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Nitrogen Rate and Source Effects on Biomass Yield of Teff Grown for Livestock Feed in the Mid-Atlantic Region
… in 2009 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 …
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Validation of N-STaR Nitrogen Rate Recommendations and Evaluation of N-STaR Soil Sampling Procedures for Clay Soils in Arkansas
… previous crop, and rice cultivar, and the Nitrogen-Soil Test for Rice (N-STaR) which quantifies the potentially mineralizable-N of the soil and provides a site-specific N recommendation. The N-STaR program has recently been developed, and the validation of N-STaR for clay soils is an …
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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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Spatial Variability of Corn Response to Nitrogen Fertilizer: Implications for Variable Rate Fertilization
… recognized that corn yield and its response to nitrogen fertilizer varies within fields. New technologies allow varying the rate of nitrogen fertilizer within fields, but the adoption of this technology is limited due to a lack of recommendations developed for this management strategy. The …
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The effect of spirea aphid (Homoptera: aphididae) feeding and nitrogen fertilization on the growth of young apple trees, with comparisons to apple aphid
… aphid, Aphis spiraecola Patch, feeding and nitrogen fertilization on net photosynthesis (Pn), leaf chlorophyll content and greenneess, growth, dry matter accumulation, and carbohydrate concentrations of young apple trees, with comparisons to apple aphid, Aphis pomi DeGeer. Trees were …
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Comparison of Soil Bulk Density After Poultry Litter Application
… consisted of poultry litter applied at the nitrogen rate (NPL), poultry litter applied at the phosphorus rate only (PPL), poultry litter applied at the phosphorus rate with supplemental inorganic nitrogen (NPPL), and inorganic fertilizer (I). Two soil cores, to a depth of 10 cm were …
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Forage Utilization and Nitrogen Management of Tall Fescue Stockpiled for Winter Grazing
… been underutilized. These studies evaluated how nitrogen rate and source can affect yield and nutritional quality of fall stockpiled tall fescue, and how grazing methods impact weight gains, forage utilization, and forage nutritive value. The first study evaluated the impact of N rate and source …
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Plant Growth and Root Zone Management of Greenhouse Grown Succulents
Effects of media, soil moisture, fertility rate, and plant growth regulators on plant growth were investigated for 13 taxa of succulents. Media: Liners were grown in five common greenhouse substrates: 80% peat, 60% bark + 30% peat moss, 80% pine bark/20% Permatil (v/v), 100% composted pine bark, or …
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Flowering Control and Production of Strobilanthes dyerianus Mast. (Persian Shield)
… bud initiation, as well as determine optimal nitrogen rate for stock plant culture. The first experiment was performed in a glass greenhouse and ran 11 weeks, utilizing 8 h, 10 h, 12 h and a 4 h night interruption photoperiod treatments to determine critical photoperiod. None of the …
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Quantifying genotypic and environmental factors affecting potato canopy growth
… quantification. The effects of planting date, nitrogen rate, cultivar and stem density were examined in two multi-year experiments. Planting date had a strong effect on early growth, though subsequent growth was less sensitive to temperature. Leaf production and canopy duration varied with …
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Using crop simulation to optimize variable rate experimentation
… a regular production crop. This concept generates large amounts of data at low cost that, after processing, will generate local models about the yield response function within a field. At the time of this work, the research group is running more than 100 trials in different states and …
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