Other Plant Sciences Commons^™

Leveraging Digital Agriculture For On-Farm Testing Of Technologies, Laila A. Puntel, Laura J. Thompson, Taro Mieno

Department of Agronomy and Horticulture: Faculty Publications

The Precision Nitrogen Project (PNP) worked with more than 80 corn and winter wheat producers to inexpensively design and implement randomized, replicated field strip trials on whole commercial farm fields, and to provide site-specific testing of current nitrogen (N) technologies. This article proposes a conceptual framework and detailed procedure to select the N technology to be tested; design and implement field trials; generate, process, and manage field trial data; and automatically analyze, report, and share benefits from precision N technology. The selection of the N technology was farmer-driven to ensure a good fit and to increase the likelihood of future …

Nitrification Inhibitor, Nitrogen Source, And Herbicide Effects On Soil Nitrogen Transformations And Corn Yield, William Neels

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Nitrogen fertilizer management continue to be challenging due to potential nitrogen losses under variable weather conditions. The objective of this was to evaluate the performance of nitrification inhibitors, nitrogen sources and herbicides on in-season nitrogen availability and agronomy indicators. A two site-year field experiment was conducted in silty clay loam soil in corn phase of the corn-soybean rotation at Central Nebraska. The treatments included three herbicide (no pre-emergence, Acuron, Resicore) and five nitrogen treatments: 1) control, 2) anhydrous ammonia, 3) anhydrous ammonia without nitrification inhibitor, 4) urea with nitrification inhibitors, and 5) urea without nitrification inhibitors. Results indicated that nitrogen …

Post-Termination Effects Of Cover Crop Monocultures And Mixtures On Soil Inorganic Nitrogen And Microbial Communities On Two Organic Farms In Illinois, Eleanor E. Lucadamo, Ashley A. Holmes, Samuel E. Wortman, Anthony C. Yannarell

Department of Agronomy and Horticulture: Faculty Publications

Cover crops can continue to affect agricultural systems even after they have been terminated by influencing nitrogen dynamics and by altering soil microbial communities. These post-termination effects can influence soil fertility, weed pressure, and the dynamics of potential plant pathogens in the narrow window of time between cover crop termination and cash crop emergence. We evaluated the post-termination effects of 12 different spring-sown cover crop mixtures and monocultures on soil nitrogen and microbial communities on two different organic farms in Central Illinois (on Lawson silt loam soil) and Northern Illinois (on Virgil silt loam soil). In comparison to control plots …

Post-Termination Effects Of Cover Crop Monocultures And Mixtures On Soil Inorganic Nitrogen And Microbial Communities On Two Organic Farms In Illinois, Eleanor E. Lucadamo, Ashley A. Holmes, Samuel E. Wortman, Anthony C. Yannarell

Department of Agronomy and Horticulture: Faculty Publications

Cover crops can continue to affect agricultural systems even after they have been terminated by influencing nitrogen dynamics and by altering soil microbial communities. These post-termination effects can influence soil fertility, weed pressure, and the dynamics of potential plant pathogens in the narrow window of time between cover crop termination and cash crop emergence. We evaluated the post-termination effects of 12 different spring-sown cover crop mixtures and monocultures on soil nitrogen and microbial communities on two different organic farms in Central Illinois (on Lawson silt loam soil) and Northern Illinois (on Virgil silt loam soil). In comparison to control plots …

Transforming Unmanned Aerial Vehicle (Uav) And Multispectral Sensor Into A Practical Decision Support System For Precision Nitrogen Management In Corn, Laura J. Thompson, Laila A. Puntel

Department of Agronomy and Horticulture: Faculty Publications

Determining the optimal nitrogen (N) rate in corn remains a critical issue, mainly due to unaccounted spatial (e.g., soil properties) and temporal (e.g., weather) variability. Unmanned aerial vehicles (UAVs) equipped with multispectral sensors may provide opportunities to improve N management by the timely informing of spatially variable, in-season N applications. Here, we developed a practical decision support system (DSS) to translate spatial field characteristics and normalized difference red edge (NDRE) values into an in-season N application recommendation. On-farm strip-trials were established at three sites over two years to compare farmer’s traditional N management to a split-application N management guided by …

Benchmarking Impact Of Nitrogen Inputs On Grain Yield And Environmental Performance Of Producer Fields In The Western Us Corn Belt, Fatima A.M. Tenorio, Eileen L. Mclellan, Alison J. Eagle, Kenneth G. Cassman, Daryl Andersen, Marie Krausnick, Russell Oaklund, John Thorburn, Patricio Grassini

Department of Agronomy and Horticulture: Faculty Publications

Benchmarking crop yields against nitrogen (N) input levels can help provide opportunities to improve N ferti-lizer efficiency and reduce N losses on maize in the US Corn Belt by identifying fields most likely to benefit from improved N management practices. Here, we evaluated a large producer database that includes field-level data on yield and applied N inputs from 9280 irrigated and rainfed fields over a 7-year period (2009–2015) in Nebraska (USA). A spatial framework, based on technology extrapolation domains, was used to cluster each field into spatial units with similar climate and soil type that represent 1.3 million ha of …

Insufficient Nitrogen Supply From Symbiotic Fixation Reduces Seasonal Crop Growth And Nitrogen Mobilization To Seed In Highly Productive Soybean Crops, Nicolas Cafaro La Menza, Juan Pablo Monzon, John L. Lindquist, Timothy J. Arkebauer, Johannes M.H. Knops, Murray Unkovich, James E. Specht, Patricio Grassini

Department of Agronomy and Horticulture: Faculty Publications

Nitrogen (N) supply can limit the yields of soybean [Glycine max (L.) Merr.] in highly productive environments. To explore the physiological mechanisms underlying this limitation, seasonal changes in N dynamics, aboveground dry matter (ADM) accumula- tion, leaf area index (LAI) and fraction of absorbed radiation (fAPAR) were compared in crops relying only on biological N2 fixation and available soil N (zero-N treatment) versus crops receiving N fertilizer (full-N treatment). Experiments were conducted in seven high-yield environments without water limitation, where crops received optimal management. In the zero-N treatment, biological N2 fixation was not sufficient to meet the N demand of …

Effects Of Nitrogen And Phosphorus Fertilizer And Topsoil Amendment On Native Plant Cover In Roadside Revegetation Projects, Heidi L. Hillhouse, Walter H. Schacht, Jonathan M. Soper, Carol E. Wienhold

Department of Agronomy and Horticulture: Faculty Publications

Establishing vegetation on roadsides following construction can be challenging, especially for relatively slow growing native species. Topsoil is generally removed during construction, and the surface soil following construction (“cut-slope soils”) is often compacted and low in nutrients, providing poor growing conditions for vegetation. Nebraska Department of Transportation (NDOT) protocols have historically called for nitrogen (N) and phosphorus (P) fertilization when planting roadside vegetation following construction, but these recommendations were developed for cool-season grass plantings and most current plantings use slower-establishing, native warmseason grasses that may benefit less than expected from current planting protocols. We evaluated the effects of nitrogen and …

Nitrogen Pulses And Competition Between Native And Invasive Plant Species, Nicolas Matallana, Mandy L. Slate, Ragan M. Callaway

Undergraduate Theses, Professional Papers, and Capstone Artifacts

Variation in the timing and size of resource fluctuations can influence how plants grow, allocate biomass, and reproduce. Resources are sometimes made available in relatively continuous, reliable pulses while other times they are temporally separated and unpredictable. Native and invasive plant species are thought to respond differently to resource fluctuations, or pulses, which can influence competitive outcomes. The “Fluctuating Resource Hypothesis” predicts that resource fluctuations benefit invasive species more than native species, potentially because many invaders are highly effective at rapidly capturing resources. In a field setting, we examined the effects of varying nitrogen pulses on competition between exotic invasive …

Grain Sorghum Leaf Reflectance And Nitrogen Status, Akwasi A. Abunyewa, Richard B. Ferguson, Charles S. Wortmann, Stephen C. Mason

Department of Agronomy and Horticulture: Faculty Publications

Nitrogen deficiency is a common but readily managed constraint to grain yield. A quick and nondestructive detection of crop N status using remote sensing could be a means to increased N use efficiency. Research was conducted in a greenhouse in 2006 at the University of Nebraska-Lincoln to establish the relationship of spectral reflectance with N status in leaves of grain sorghum, to develop indices for interpretation of the results and to predict chlorophyll content. Nitrogen stress decreased chlorophyll meter reading and leaf N content, but increased leaf and canopy reflectance. The SPAD values were significantly increased by both water and …

Nutrients In The Nexus, Eric A. Davidson, Rachel L. Nifong, Richard B. Ferguson, Cheryl Palm, Deanna L. Osmond, Jill S. Baron

Department of Agronomy and Horticulture: Faculty Publications

Synthetic nitrogen (N) fertilizer has enabled modern agriculture to greatly improve human nutrition during the twentieth century, but it has also created unintended human health and environmental pollution challenges for the twentyfirst century. Averaged globally, about half of the fertilizer-N applied to farms is removed with the crops, while the other half remains in the soil or is lost from farmers’ fields, resulting in water and air pollution. As human population continues to grow and food security improves in the developing world, the dual development goals of producing more nutritious food with low pollution will require both technological and socioeconomic …

Remote Estimation Of Nitrogen And Chlorophyll Contents In Maize At Leaf And Canopy Levels, Michael Schlemmer, Anatoly A. Gitelson, James S. Schepers, Richard B. Ferguson, Y. Peng, J. Shanahan, Donald Rundquist

Department of Agronomy and Horticulture: Faculty Publications

Leaf and canopy nitrogen (N) status relates strongly to leaf and canopy chlorophyll (Chl) content. Remote sensing is a tool that has the potential to assess N content at leaf, plant, field, regional and global scales. In this study, remote sensing techniques were applied to estimate N and Chl contents of irrigated maize (Zea mays L.) fertilized at five N rates. Leaf N and Chl contents were determined using the red-edge chlorophyll index with R2 of 0.74 and 0.94, respectively. Results showed that at the canopy level, Chl and N contents can be accurately retrieved using green and red-edge Chl …

Using Stable Isotope Analysis Of Zooplankton To Document Trophic And Biogeochemical Changes In The San Francisco Estuary, Steven C. Westbrook, Julien Moderan

STAR Program Research Presentations

Zooplankton represent a vital link between phytoplankton and fish, like the endangered Delta Smelt. Human interferences (nitrates from waste water, flow alteration, invasive species introduction…) have altered the structure of the San Francisco Estuary (SFE) ecosystem. We use stable isotope analysis to improve our knowledge of the planktonic food web in the SFE and gain insights into its evolution over the past decades. We use the ratios of certain isotopes (Nitrogen, Carbon, Sulfur, etc.) in different species of zooplankton to tell us what it is feeding on as well as the trophic level it feeds in. My research focused on …

The Influence Of Nutrients And Physical Habitat In Regulating Algal Biomass In Agricultural Streams, Mark D. Munn, Jeffrey Frey, Anthony Tesoriero

United States Geological Survey: Water Reports and Publications

This study examined the relative influence of nutrients (nitrogen and phosphorus) and habitat on algal biomass in five agricultural regions of the United States. Sites were selected to capture a range of nutrient conditions, with 136 sites distributed over five study areas. Samples were collected in either 2003 or 2004, and analyzed for nutrients (nitrogen and phosphorous) and algal biomass (chlorophyll a). Chlorophyll a was measured in three types of samples, fine-grained benthic material (CHLFG), coarse-grained stable substrate as in rock or wood (CHLCG), and water column (CHLS). Stream and riparian habitat were characterized at each site. TP ranged from …

Plant Functional Types Do Not Predict Biomass Responses To Removal And Fertilization In Alaskan Tussock Tundra, M. Syndonia Bret-Harte, Michelle C. Mack, Gregory R. Goldsmith, Daniel B. Sloan, Jennie Demarco, Gaius R. Shaver, Peter M. Ray, Zy Biesinger, F. Stuart Chapin

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

1. Plant communities in natural ecosystems are changing and species are being lost due to anthropogenic impacts including global warming and increasing nitrogen (N) deposition. We removed dominant species, combinations of species and entire functional types from Alaskan tussock tundra, in the presence and absence of fertilization, to examine the effects of non-random species loss on plant interactions and ecosystem functioning.

2. After 6 years, growth of remaining species had compensated for biomass loss due to removal in all treatments except the combined removal of moss, Betula nana and Ledum palustre (MBL), which removed the most biomass. Total vascular plant …

Sheep Updates 2007 - Part 3, Andrew Ritchie, Edward Riggall, James Hall, Gus Rose, Johan Greeff, John Young, M. Alchin, M. Young, T. Johnson, John Lucy, Martin Staines, Tim Wiley, Rob Grima, Sandra Prosser, Matt Ryan, Geoff Moore, Tony Albertsen, Phil Barrett-Lennard, George Woolston, John Titerington, Sarah Knight, Brianna Peake

Sheep Updates

This session covers seven papers from different authors:

PROFITABILITY

1. Benchmarking demonstrates both the potential and realised productivity gains in the sheep and wool industry, Andrew Ritchie, Edward Riggall and James Hall, ICON Agriculture, Darkan

2. Improving sheep genetics will increase farm profitability, Gus Rose, Johan Greeff Department of Agriculture and Food Western Australia, John Young Farming Systems Analysis Service, WA

3. Meat, Merinos and making money in WA Pastoral Zone, M. Alchin, M. Young and T. Johnson, Department of Agriculture and Food Western Australia,

GRAZING

4. Nitrogen - farmers' friend or foe? John Lucy and Martin Staines, Department …

Crop Updates 2006 - Katanning, David Stephens, Michael Meuleners, Meredith Fairbanks, Thomas Schulz, T. J. Flowers, T. D. Colmer, Narelle Simpson, Ron Mctaggart, Wal Anderson, Lionel Martin, Dave Allen, Brenda Shackley, Raj Malik, Kelly Winfield, Rodger Beermier, Shahahan Miyan, Abul Hashem, Shahab Pathan, Vikki Osten, Alex Douglas, Garren Knell, Steve Curtin, Wade Longmuir, Henry Brockman, Justin Hardy, Arjen Ryder, John Paul Collins, Jessica Johns, John Pepall, Allan Herbert

Crop Updates

This session covers sixteen papers from different authors

1. 2006 SEASONAL OUTLOOK, David Stephens and Michael Meuleners, Department of Agriculture

2. Review of climate model summaries reported in the Department of Agriculture’s growing season outlooks, Meredith Fairbanks, Department of Agriculture

3. Farmers commodity outlook 2006, Thomas Schulz, Department of Agriculture

4. Why is salinity such a difficult problem for plant breeders? T J Flowers, TD Colmer, University of Western Australia

5. Matching nitrogen supply to wheat demand in 2005, Narelle Simpson, Ron McTaggart, Wal Anderson, Lionel Martin and Dave Allen, Department of Agriculture

6. Wheat varieties in 2006, Brenda Shackley, …

   ---

   Go to article

Influence Of Nutrient Availability, Stand Age, And Canopy Structure On Isoprene Flux In A Eucalyptus Saligna Experimental Forest, Jennifer L. Funk, Christian P. Giardina, Alexander Knohl, Manuel T. Lerdau

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

Eucalyptus plantations occupy approximately 10 million ha of land in the tropics and, increasingly, afforestation and reforestation projects are relying on this genus to provide rapid occupation of degraded sites, large quantities of high-quality wood products, and high rates of carbon sequestration. Members of the genus Eucalyptus are also very high emitters of isoprene, the dominant volatile organic compound emitted by trees in tropical ecosystems, which significantly influences the oxidative capacity of the atmosphere. While fertilization growth response of these trees has been intensively studied, little is known about how fertilization and tree age alter isoprene production from plantations of …

Organic Horticulture: Strategic Opportunities In Western Australia, Steven Mccoy

Bulletins 4000 -

This report considers the potential to develop organic horticulture in WA. The study examines key factors limiting industry scale and scope and identifies preferred soil types, regional locations, prospective crops and potential scale where organic production may offer comparative economic advantage.

Crop Updates 2002 - Geraldton, Steve Penny Jr, Robin Wilson, Iian Barclay, Robyn Mclean, Robert Loughman, Jenny Garlinge, Bill Lambe, Neil Venn, Peter Clarke, Wal Anderson, Raffaele De Cima, James Bee, Darshan Sharma, Sheena Lyon, Melaine Kupsch, Mohammad Amjad, Pam Burgess, Veronika Reck, Brenda Shackley, Ray Tugwell, Bindi Webb, Robert Park, Daya Patabendige, Phil Michael, Debbie Thackray, Jenny Hawkes, Roger Jones, David Stephens, Bob French, Laurie Wahlsten, Glen Riethmuller, M. Bolland, P. White, T. Khan, Kevin Walden, Ravjit Khangura, Martin J. Barbetti, Graham Walton, Françoise Berlandier, Paul Carmody, Christiaan Valentine, Roy Latter, Keith Devenish, Bill Bowden, Michael O'Connell, Chris Gazey, David Gartner, Caroline Peek, David Rogers, Greg Shea, George Yan, Alexandra Douglas, Sally Peltzer, Paul Matson, David Minkey, Clinton Revell, Giles Glasson, Dean Thomas, Aik Cheam, Siew Lee, Mike Clarke, Peter Newman, Glenn Adam

Crop Updates

This session covers twenty seven papers from different authors:

1. Taking the Why out of Wyalkatchem – the new widely adapted wheat variety, Steve Penny Jr, Department of Agriculture

2. Future wheat varieties, Robin Wilson, Iain Barclay,Robyn McLean, Robert Loughman, Jenny Garlinge, Bill Lambe, Neil Venn and Peter Clarke

Department of Agriculture

3. Maximising wheat variety performance through agronomic management, Wal Anderson, Raffaele Del Cima, James Bee, Darshan Sharma, Sheena Lyon, Melaine Kupsch, Mohammad Amjad, Pam Burgess, Veronika Reck, Brenda Shackley, Ray Tugwell, Bindi Webb and Steve Penny Jr

Department of Agriculture

4. Cereal rust update 2002 – …

Crop Updates 2001 - Cereals, Ross Kingwell, Wal Anderson, Eddy Pol, Peter Burgess, Ashley Bacon, D. M. Bakker, G. J. Hamilton, D. Houlbrooke, C. Spann, M. A. Hamza, Paul Blackwell, M. D. A. Bolland, Maurice Black, R. F. Brennan, W. L. Crabtree, Bill Bowden, Chris Gazey, Rochelle Strahan, Bob Gilkes, Zed Rengel, Stephen Loss, Tim O'Dea, Patrick Gethin, Ryan Guthrie, Lisa Leaver, David Phelps, Darshan Sharma, Mohammad Amjad, Md Sanajahanh Miyan, James Fisher, Senthold Asseng, Bill Bowden, Michael Robertson, Glenn Macdonald, Kevin Young, Blakely Paynter, Jatinderpal Bathal, Cameron Weeks, Kithsiri Jayasena, Rob Loughman, Q. Knight, Dominie Wright, Nichole Burges, Lisa-Jane Blacklow, Rob Hulme, Rob Griffith, Jenny Hawkes, Roger Jones, Debbie Thackray, S. B. Sharma, S. Kelly, Peter Newman, Dave Nicholson, Harmohinder Dhammu, Terry Piper, Mario F. D'Antuono, Mehmet Cakir, Nick Galwey, David Poulsen, Garry Ablett, Reg Lance, Greg Platz, Joe Panozzo, Barbara Read, David Moody, Andy Barr, Peter Langridge, Tina Botwright, Tony Condon, Robin Wilson, Iain Barclay, Howard Carr, Greg Shea, Ian Foster, David Tennant

Crop Updates

This session covers forty two papers from different authors:

PLENARY

1. Planning your cropping program in season 2001, Dr Ross Kingwell, Agriculture Western Australia and University of Western Australia

WORKSHOP

2. Can we produce high yields without high inputs? Wal Anderson, Centre for Cropping Systems, Agriculture Western Australia

VARIETIES

3. Local and interstate wheat variety performance and $ return to WA growers, Eddy Pol, Peter Burgess and Ashley Bacon, Agritech Crop Research

CROP ESTABLISHMENT

4 Soil management of waterlogged soils, D.M. Bakker, G.J. Hamilton, D. Houlbrooke and C. Spann, Agriculture Western Australia

5. Effect of soil …

Crop Updates 2001 - Oilseeds, Mervyn Mcdougall, Debbie Thackray, Kevin Walden, G. Walton, Kevin Morthorne, Stephen Addenbrooke, Paul Carmody, Rafiul Alam, Glen Riethmuller, Greg Hamilton, Paul Blackwell, M. D. A. Bolland, M. J. Baker, A. J. Diggle, Chris Gazey, Imma Farre, Michael J. Robertson, Senthold Asseng, Ping Si, David Turner, David Harris, Françoise Berlandier, Christiaan Valentine, David Cook, Peter Mangano, David Cousins, Darryl Hardie, Ravjit Khangura, Martin Barbetti, Jenny Hawkes, Roger Jones, Cameron Weeks, Erin Hasson, David Eksteen, John Moore, Paul Matson, Carla Thomas, Lionel Martin

Crop Updates

ABSTRACT

This session covers twenty five papers from different authors:

FORWARD, Mervyn McDougall, CHAIRMAN, PULSES AND OILSEEDS PARTNERSHIP GROUP

PLENARY

1. Implications of the ‘green-bridge’ for viral and fungal disease carry-over between seasons, Debbie Thackray, Agriculture Western Australia and Centre for Legumes in Mediterranean Agriculture

2. Insect pest development in WA via the ‘green-bridge’, Kevin Walden, Agriculture Western Australia

VARIETIES

3. Performance of new canola varieties in AGWEST variety trials, G. Walton, Crop Improvement Institute, Agriculture Western Australia

4. New herbicide tolerant varieties in WA, Kevin Morthorpe, Stephen Addenbrooke, Pioneer Hi-Bred Australia P/L

5. IT v’s TT – …

Crop Updates 2001 - Grower Booklet, Graeme Robertson, Jatinderpal Bathal, Cameron Weeks, Kithsiri Jayasena, Rob Loughman, Bill Bowden, Chris Gazey, Ross Brennan, Ian Foster, Q. Knight, Ross Kingwell, S. B. Sharma, S. Kelly, Glen Mcdonald, Kevin Young, Blakely Paynter, Keith Devenish, Abul Hashem, Nerys Wilkins, Terry Piper, Sally Peltzer, Clinton K. Revell, Candy Hudson, Ian Rose, Alexandra Wallace, Paul Blackwell, Miles Obst, David Bowran, Bevan J. Buirchell, Moin U. Salam, Art Diggle, Geoff J. Thomas, Mark W. Sweetingham, Bill O'Neill, Rafiul Alam, Glen Riethmuller, Greg Hamilton, Paul Carmody, G. Walton, B. Macleod, Mark Seymour, Harmohinder Dhammu, D. Nicholson, M. D'Antuono

Crop Updates

1. Strategies for leaf disease management in wheat, Jatinderpal Bhathal¹, Cameron Weeks², Kith Jayasena¹ and Robert Loughman¹, 1Agriculture Western Australia. 2Mingenew-Irwin Group Inc.

2. Burn stubble windrows: to diagnose soil fertility problems, Bill Bowden, Chris Gazey and Ross Brennan, Agriculture Western Australia

3. Rainfall – what happened in 2000 and the prospects for 2001, Ian Foster, Agriculture Western Australia

4. Strategies for leaf disease management in malting barley, K. Jayasena1, Q. Knight2 and R. Loughman1, 1Agriculture Western Australia, 2IAMA Agribusiness

5. Planning your cropping program in season 2001, Dr …

Fertility Build Up Under Northern Wheatbelt Pastures, M L. Poole

Journal of the Department of Agriculture, Western Australia, Series 4

Experiments on two farmers' properties demonstrated that legume pastures increase the fertility of northern wheatbelt soils.

Crops on legume pastures had higher yields than crops on volunteer pasture.

The experiments also indicated the most productive legume species for each situation and demonstrated that nitrogen added by legumes has a residual effect in the soil.

The Effect Of Urea, Ammonium Sulfate, And Organic Materials On Nitrite Accumulation And Gaseous Loss Of Nitrogen In Acid Soil, Siddangouda V. Patil

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Nitrogen is one of the major elements essential for plant growth. It is the element most prone to depletion by cultivation and is usually found deficient in soils. In successful farming the problem of nitrogen supply is of special importance because plants need it in large amounts, it is fairly expensive to supply, and it is easily lost from the soil.

Seasonal Yield And Nitrogen Content Of Three Grasses Grown Alone And In Association With Each Other And With White Dutch Clover, Donald B. Wilson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The chief aim of pasture research is to discover means of providing the largest possible amount of highly nutritious forage at the time the animal requires it. Throughout the grazing season animal herbage requirements are relatively constant, while herbage production from pastures usually is quite variable.

Nitrogen Content And Protein Yield Of Alfalfa As Influenced By Variety, William H. Bennett

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Twenty-four alfalfa varieties, representing four varietal groups, were compared for nitrogen content and protein yield. A highly significant difference between varieties was noted for nitrogen content, and a significant difference for protein yield. Saskatchewan 666 had the highest content in the first cutting, but Ledak 22009 had the highest content in the third. Group differences were not significant. Crop differences were highly significant for nitrogen content, yield of forage, and of protein. In the case of every variety, the third cutting was richer in nitrogen than the second and the seemed was richer than the first. Protein yield, however, was …