Proceedings
Year
| Filter results37 paper(s) found. |
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1. Active and Passive Spectral Sensing for Predicting the Optimum Nitrogen Rate and Timing in CornThere are many in-season plant diagnostic tools available for predicting the rate and timing of in-season nitrogen fertilizer in corn (Zea mays L.). However, soils in Southern Minnesota are generally high in organic matter and can carry over nitrate- nitrogen from one season to the next. Subsequently, there is oftentimes sufficient soil nitrogen early in the growing season to supply much of the crop requirement, limiting the use of sensor-based N management tools. Past wor... T. Nigon, D. Kaiser, C. Yang, D. Mulla |
2. Active-Optical Reflectance Sensing Evaluated for Red and Red-Edge Waveband SensitivityUncertainty exists with corn (Zea mays L.) N management due to year-to-year variation in crop N need, soil N supply, and N loss from leaching, volatilization, and denitrification. Active-optical reflectance sensing (AORS) has proven effective in some fields for generating N fertilizer recommendations that improve N use efficiency. However, various sensors utilize different wavebands of light to calculate N fertilizer recommendations making it difficult to know which waveband is most sens... G. Bean, N. Kitchen, J. Camberato, R. Ferguson, F. Fernandez, D. Franzen, C. Laboski, E. Nafziger, J. Sawyer, P. Scharf, J. Schepers, J. Shanahan |
3. An Integrated Approach to Understanding Poultry Litter Use in Corn-Soybean Production SystemsThe majority of poultry litter (PL) in Kentucky is generated in the western third of the state, the same area that produces approximately 80% of corn, soybean, and wheat. This PL is applied to row crop fields as a nutrient source. Producers and commodity board representatives were concerned with reported nutrient availability coefficients, nutrient value, and long-term use of PL. Four field sites in a NT corn-soybean rotation were identified in the fall of 2012 with low to medium soil test va... E. Ritchey, E. Haramoto, C. Bradley |
4. Arbuscular Mycorrhizal Fungi and Their Role in Modern AgricultureArbuscular mycorrhizal (AM) fungi are obligate symbionts of over 90% of land plants, including most of the worlds economically important food crops. This symbiosis is believed to have evolved some 400 million years ago concurrentwith land plant flora to assist in phosphate uptake, an ion of poor mobility in soil. A key feature of the symbiosis is the ‘arbuscule’, a fungal organ that penetrates root cortical cells and forms a convoluted peri-arbuscular membrane of large surfac... R. Drijber |
5. Basic Concepts of Soil Acidity and LimingWith today’s cropping systems utilizing high rates of N fertilizers, most Midwestern soils require periodic applications of aglime or other liming materials for optimum crop production. Liming has several beneficial effects: 1) it reducesaluminum or manganese toxicity, harmful or potentially toxic conditions which can develop in acid soils; 2) it increases the availability of some of the essential nutrients; 3) it replaces the supply of calcium and magnesium essential for plant gro... D. Mengel |
6. Can a Winter Rye Cover Crop Mitigate Nitrate Leaching from Corn Production on Irrigated Coarse Textured Soils?Minnesota has approximately 500,000 acres of irrigated coarse textured soils. These soils are very productive but are highly vulnerable to nitrate (NO --N) leaching and ground water contamination. In these soils, most of the NO --N leaching losses take place in early spring and late fall, when precipitation is high and crops have limited water and nutrient uptake. The objectives of this study are 1) quantify the capacity of rye (Secale cereal L.) as a cover crop to mi... N. Ricks, F. Fernandez, J. Baker |
7. Can Narrow Row Spacing be Used to Manage Higher Planting Densities of Corn?The average U.S. corn (Zea mays L.) plant density has increased 988 plants ha-1 year-1. As this trend continues, narrow row spacings can be used to increase the distance between plants within a row and provide greater plant spacing across a given area. The overall goal of this study was to understand the relationship between row spacings and planting densities across different hybrids on corn growth and grain yield. The experiment was conducted in Champaign, IL to evaluate the inter... B. Bernhard, F. Below |
8. Cereal Rye and Hairy Vetch Cover Crops for Improving Soil and Water QualitySoil and water quality benefits of cover crops (CCs) have been inferred only from plot scale studies. Replicating cover crops at the watershed scale and expecting similar results to that of plot scale studies need further research. Therefore, cover crop study at Southern Illinois was carried at the plot as well as the watershed scale. The objectives of plot scale study were (i) to evaluate the contribution of fertilizer and soil organic matter (SOM) to N leaching under corn/soybean ... S. Gurbir, K. Williard, J. Schoonover, R. Cook, R. Mcelroy |
9. Comparison of Ground-Based Active Crop Canopy Sensor and Aerial Passive Crop Canopy Sensor for In-Season Nitrogen ManagementCrop canopy sensors represent one tool available to help calculate a reactive in-season nitrogen (N) application rate in corn. When utilizing such systems, corn growers must decide between using active versus passive crop canopy sensors. The objectives of this study was to 1) determine the correlation between N management by remote sensing using a passive sensor and N management using proximal sensing with an active sensors. Treatments were arranged as field length strips in a randomized comp... J. Parrish, R. Ferguson, J. Luck, K. Glewen, L. Thompson, B. Krienke, N. Mueller, T. Ingram, D. Krull, J. Crowther, T. Shaver, T. Mieno |
10. Corn grain nitrogen and yield with foliar nitrogen application at early reproductive growth stageLate fungicide applications in corn with the use of high clearance equipment create the opportunity for additional foliar fertilizer applications. The objectives of this study were to (1) evaluate the benefit of fungicide applications on yield and grain N in combination with foliar N applications and (3) assess the value of foliar N the application using N sources with urea- formaldehyde/triazone during the VT-R1 growth stage. This experiment was conducted at 6 locations in 2016 and 2017... A. Stammer, D. Ruiz diaz |