Browsing by Subject "Crop yield"
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Item 1999 Minnesota Field Crop Trials(Minnesota Agricultural Experiment Station, 1999) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item 2000 Minnesota Field Crop Trials(Minnesota Agricultural Experiment Station, 2000) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item 2001 Minnesota Field Crop Trials(Minnesota Agricultural Experiment Station, 2001) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item 2002 Minnesota Field Crop Trials(Minnesota Agricultural Experiment Station, 2002) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item 2003 Minnesota Field Crop Trials(Minnesota Agricultural Experiment Station, 2003) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item 2004 Minnesota Field Crop Trials(Minnesota Agricultural Experiment Station, 2004) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item 2010 Minnesota Field Crop Trials(Minnesota Agricultural Experiment Station, 2010) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item 2011 Minnesota Field Crop Trials(Minnesota Agricultural Experiment Station, 2011) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item 2012 Minnesota Field Crop Trials(Minnesota Agricultural Experiment Station, 2012) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item 2013 Minnesota Field Crop Trials(Minnesota Agricultural Experiment Station, 2013) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item Agricultural intensification and global environmental change(2013-08) Mueller, Nathaniel DeanIntensification of agricultural management has allowed substantial increases in food production on existing agricultural lands, but with major global environmental costs. This dissertation explores the global-scale possibilities and tradeoffs associated with agricultural intensification using spatial data analysis and modeling. In Chapter 2, we analyze intensification opportunities from closing yield gaps, and find that large production increases (45% to 70% for most crops) are possible. We also examine what changes to management practices may be necessary to close these yield gaps, and find these vary considerably by region and current management intensity. A sub-national, crop-specific dataset of cropland nutrient use was developed to support this analysis. Chapter 3 focuses on intensification potential in the context of climate change. We find that a moderate yield gap closure scenario could result in net yield increases across much of the globe, even in the context of circa 2050 climate change. However, the capacity for intensification to overcome climate impacts erodes considerably under uniform global temperature increases of 4-5°C. Chapter 4 examines the opportunity space for improved nitrogen (N) management. We find that a reallocation of spatial N use intensity could achieve current cereal production with ~50% less N application and ~60% less excess N. We quantify a tradeoff frontier for nitrogen use and cereal production, and discuss the potential for efficiency improvements to push the frontier forward. This dissertation highlights the importance of improving agricultural management across the globe to meet food security and environmental goals.Item Minnesota Hybrid Corn: Field Trials, 1958(Minnesota Agricultural Experiment Station, 1959-03) Minnesota Agricultural Experiment Station; Peterson, R. H.; Rinke, E. H.; Sentz, J. C.Compiles corn crop trials from multiple locations in Minnesota.Item Predicting agronomic performance of barley using canopy reflectance data(Canadian Journal of Plant Pathology, 2004) Steffenson, Brian; Fetch, T.G.; Pederson, V.D.The ability to accurately and rapidly predetermine agronomic performance would be desirable in most plant breeding programs. Remote sensing of canopy reflectance is a quick and nondestructive method that may be useful in the estimation of agronomic performance. Studies were conducted at Fargo and Langdon, North Dakota, to determine the effectiveness of a multispectral radiometer in estimating yield, kernel plumpness (KP), and 1000-kernel weight (TKW) in barley. Canopy reflectance was measured in eight (500–850 nm) discrete narrow-wavelength bands. Three types of reflectance models were evaluated: simple models using one to four wavelengths, simple ratio and normalized difference vegetation indices (NDVI) using green, red, and near-infrared wavelengths, and soil-adjusted vegetation indices (SAVI). The relationship between canopy reflectance and agronomic performance was significantly influenced by environment, growth stage, and plant genotype. Grain yield was best estimated near GS73 (0.84 < R2 < 0.92) at Fargo and at GS83 (0.55 < R2 < 0.81) at Langdon. In contrast, KP and TKW could be estimated at both late (GS83; 0.68 < R2 < 0.93) and early (GS24–GS47; 0.72 < R2 < 0.91) growth stages. The 550-nm and 800-nm wavelengths are critical for development of predictive models. A simple model using 550-nm, 600-nm, and 800-nm from GS47-GS73 gave significant (0.45 < R2 < 0.64) estimation of agronomic performance across all environments. In contrast, simple ratio, NDVI, and SAVI were less effective (0.05 < R2 < 0.77) in predicting agronomic performance. Remote sensing using canopy reflectance is a potential tool to estimate agronomic performance of barley, but genotypic and crop stage factors affect this method. Further studies are needed to improve the usefulness of multispectral radiometry in predicting agronomic performance.Item Varietal Trials of Farm Crops(Minnesota Agricultural Experiment Station, 1953-06) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item Varietal Trials of Farm Crops(Minnesota Agricultural Experiment Station, 1971-12) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item Varietal Trials of Farm Crops(Minnesota Agricultural Experiment Station, 1966-12) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item Varietal Trials of Farm Crops(Minnesota Agricultural Experiment Station, 1976) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item Varietal Trials of Farm Crops(Minnesota Agricultural Experiment Station, 1968-12) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item Varietal Trials of Farm Crops(Minnesota Agricultural Experiment Station, 1955-06) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.Item Varietal Trials of Farm Crops(Minnesota Agricultural Experiment Station, 1954-06) Minnesota Agricultural Experiment StationCompiles crop trials from multiple locations in Minnesota.