Kenneth Cassman
University of Nebraska Lincoln, Agronomy and Horticulture, Faculty Member
Average corn grain yields in the USA have increased linearly at a rate of 1.7 bu/acre over the past 35 years with a national yield average of 140 bu/acre. Corn yield contest winners and simulation models, however, indicate there is ~100... more
Average corn grain yields in the USA have increased linearly at a rate of 1.7 bu/acre over the past 35 years with a national yield average of 140 bu/acre. Corn yield contest winners and simulation models, however, indicate there is ~100 bu/a in exploitable corn yield gap. Four years (1999-2002) of plant development, grain yield and nutrient uptake were compared
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Despite a rapid worldwide expansion of the biofuel industry, there is a lack of consensus within the scientific community about the potential of biofuels to reduce reliance on petroleum and decrease greenhouse gas (GHG) emissions.... more
Despite a rapid worldwide expansion of the biofuel industry, there is a lack of consensus within the scientific community about the potential of biofuels to reduce reliance on petroleum and decrease greenhouse gas (GHG) emissions. Although life cycle assessment provides a means to quantify these potential benefits and environmental impacts, existing methods limit direct comparison within and between different biofuel
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Research Interests: Genetics, Information Technology, Molecular Biology, Soil Chemistry, Plant Nutrition, and 19 moreBiological Sciences, Environmental Sciences, System Approach, Nutrient Management, Maize, Site specific nutrient management, United States, Profitability, Spatial Scale, Soil Quality, Mushroom Nutrient Requirement, Environmental Conditions, Natural Resource, Nutrient Use Efficiency, Production System, Large Scale, Cropping System, Oryza Sativa L, and Yield potential
At a global scale, cereal yields and fertilizer N consumption have increased in a near-linear fashion during the past 40 years and are highly correlated with one another. However, large differences exist in historical trends of N... more
At a global scale, cereal yields and fertilizer N consumption have increased in a near-linear fashion during the past 40 years and are highly correlated with one another. However, large differences exist in historical trends of N fertilizer usage and nitrogen use efficiency (NUE) among regions, countries, and crops. The reasons for these differences must be understood to estimate future N fertilizer requirements. Global nitrogen needs will depend on: (i) changes in cropped cereal area and the associated yield increases required to meet increasing cereal demand from population and income growth, and (ii) changes in NUE at the farm level. Our analysis indicates that the anticipated 38% increase in global cereal demand by 2025 can be met by a 30% increase in N use on cereals, provided that the steady decline in cereal harvest area is halted and the yield response to applied N can be increased by 20%. If losses of cereal cropping area continue at the rate of the past 20 years (-0.33% pe...
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... term benefits from green manure appears to reflect the unique N-and carbon-conserving properties of ... N supply available to the rice crop is not closely associated with organic matter or ... Instead, factors such as soil aeration,... more
... term benefits from green manure appears to reflect the unique N-and carbon-conserving properties of ... N supply available to the rice crop is not closely associated with organic matter or ... Instead, factors such as soil aeration, crop residue management, and tillage practices have a ...
Research Interests: Crop management and CM
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... 3. Importance and Effect of Nitrogen on Crop Quality and Health Jürg M. Blumenthala, David D. Baltenspergera, Kenneth G. Cassmanb ... Wedin (1974) and Odom et al.(1980) suggested that increased alkaloid concentration in reed canary... more
... 3. Importance and Effect of Nitrogen on Crop Quality and Health Jürg M. Blumenthala, David D. Baltenspergera, Kenneth G. Cassmanb ... Wedin (1974) and Odom et al.(1980) suggested that increased alkaloid concentration in reed canary grass (Phalaris arundinacea L.) and tall ...
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... University of Leuven, Belgium. More science jobs. Post a job for free. Green revolution still too green. Thomas R. Sinclair 1 & Kenneth G. Cassman 2. ... You can also request this document from your local library through... more
... University of Leuven, Belgium. More science jobs. Post a job for free. Green revolution still too green. Thomas R. Sinclair 1 & Kenneth G. Cassman 2. ... You can also request this document from your local library through inter library loan services. ...
Research Interests: Pharmacology, Biochemistry, Bioinformatics, Evolutionary Biology, Genetics, and 39 moreMarine Biology, Neuroscience, Environmental Science, Geophysics, Physics, Materials Science, Quantum Physics, Developmental Biology, Immunology, Climate Change, Molecular Biology, Structural Biology, Genomics, RNA, Computational Biology, Transcriptomics, Biotechnology, Systems Biology, Cancer, Biology, Metabolomics, Cell Cycle, Proteomics, Ecology, Drug Discovery, Evolution, Nanotechnology, Astrophysics, Neurobiology, Medicine, Palaeobiology, Functional Genomics, Nature, Signal Transduction, Astronomy, DNA, Cell Signalling, Medical Research, and Earth Science
Research Interests: Weed Science and Nitrogen
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such effects, especially for chemically extracted SOM fractions. In this study, we explore the relationship be- Although the chemical nature of soil organic matter (SOM) is tween the chemical nature of extracted HA fractions thought to... more
such effects, especially for chemically extracted SOM fractions. In this study, we explore the relationship be- Although the chemical nature of soil organic matter (SOM) is tween the chemical nature of extracted HA fractions thought to affect the mineralization rate of N bound in SOM, little direct evidence exists for such effects. To test the hypothesis that the and their
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Boone, 1994). Despite these efforts, no single fraction- ation method has been shown to cleanly distinguish Nitrogen mineralization in irrigated lowland rice (Oryza sativa L.) SOM fractions based on their contributions to soil N soils is... more
Boone, 1994). Despite these efforts, no single fraction- ation method has been shown to cleanly distinguish Nitrogen mineralization in irrigated lowland rice (Oryza sativa L.) SOM fractions based on their contributions to soil N soils is poorly predicted by total soil C and N. To improve its predic- tion, two humic acid fractions were extracted with NaOH from lowland mineralization