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Precision Drought Stress In Orchards: Rootstock Evaluation, Trunk Hydration And Canopy Temperature, Lance V. Scott 2017 Utah State University

Precision Drought Stress In Orchards: Rootstock Evaluation, Trunk Hydration And Canopy Temperature, Lance V. Scott

All Graduate Theses and Dissertations

In many areas, over half of all diverted water is used for irrigation. Tree fruit crops use a lot of water, but water productivity can be increased using properly-timed precision water stress. In addition to water conservation, increases in water productivity arise from better fruit quality, increased storage life and reductions in pruning and maintenance. One major hurdle to applying precision water stress in orchards is the lack of a reliable, automated method of determining tree water status. However, the influence of physiological characteristics such as rootstock vigor on water productivity are also important. Selecting the most appropriate rootstocks and ...


Relation Of Moisture To Seed Production In Alfalfa, J. N. Martin 2017 Iowa State College

Relation Of Moisture To Seed Production In Alfalfa, J. N. Martin

Research Bulletin (Iowa Agriculture and Home Economics Experiment Station)

As a result of the experiments carried on to determine the effect of moisture upon seed production in alfalfa, the following conclusions have been drawn, based upon the work of the experiments as presented in this bulletin:

1. The setting of seed pods in alfalfa, (Medicago sativa), is dependent upon the proper functioning of the pollen.

2. Germination of the pollen depends upon a proper supply (l! moisture. If the water supply is either above or below a certain requirement, the pollen does not germinate.

3. The water requirement for germination of the pollen depends upon a certain ratio between ...


The Fundamentals Of Nutrient Management, Rhonda Miller, Clark Israelsen, Jim Bowcutt, Neils Hansen 2017 Utah State University Extension

The Fundamentals Of Nutrient Management, Rhonda Miller, Clark Israelsen, Jim Bowcutt, Neils Hansen

Clark Israelsen

This publication gives best management practices of nutrient management in livestock and dairy facilities.


Use Of Endomaxx Mycorrhizal Seed Treatment To Improve Potato Production In Maine, John M. Jemison Jr. 2017 University of Maine Cooperative Extension

Use Of Endomaxx Mycorrhizal Seed Treatment To Improve Potato Production In Maine, John M. Jemison Jr.

Cooperative Extension - Agriculture

With the increasing cost of fertilizer and the ever-decreasing supply of apatite worldwide, improving phosphorus (P) uptake should be a goal for all producers. Due to our high levels of iron and aluminum oxides in Maine soils, P efficiency is very poor. As a result, potato farmers tend to over apply P to ensure that their crop will have adequate P. Over time, this has led to increasing plant available soil test P levels. I recently requested the Maine Soil Test Lab director for potato soil tests over the past ten years. The percentage of soils testing above 40 lbs ...


Nurse Cropping In Potato Systems, John M. Jemison Jr. 2017 University of Maine Cooperative Extension

Nurse Cropping In Potato Systems, John M. Jemison Jr.

Cooperative Extension - Agriculture

In the summer of 2016, a study was conducted at the Rogers Farm in Stillwater, Maine to study the effect of short-term nurse crops on potato yield and quality. The study was designed as a randomized complete block design with six replications. The study compared two sowing rates (winter rye at 100 vs. 200 lbs/ac) to 20 lbs of annual ryegrass or a check plot (no nurse crop). In addition, each of the winter rye treatments was either killed with an herbicide prior to one-pass hilling or just hilled. To address the question of how long to grow a ...


Sudden Death Syndrome – A Growing Threat Of Losses In Soybeans, Shrishail S. Navi, X. B. Yang 2017 Iowa State University

Sudden Death Syndrome – A Growing Threat Of Losses In Soybeans, Shrishail S. Navi, X. B. Yang

Shrishail S. Navi

Sudden death syndrome (SDS) caused by Fusarium virguliforme is one of the major yield-limiting soil borne diseases of soybean (Glycine max). The SDS has been reported from 21 U.S. states and is known to occur in Africa, North America, and South America. In the U.S. the losses due to SDS was estimated at $3.06 billion for a period from 1988 to 2010. Since 1983, several management approaches have been investigated to reduce SDS and yet, continued efforts are necessary to develop long term disease management programs and to sustain disease below economic threshold levels. Integrating available control ...


Towards The Development Of A Sustainable Soya Bean-Based Feedstock For Aquaculture, Hyunwoo Park, Steven Weier, Fareha Razvi, Pamela A. Peña, Neil A. Sims, Jennica Lowell, Cory Hungate, Karma Kissinger, Gavin Key, Paul Fraser, Jonathan Napier, Edgar B. Cahoon, Thomas Clemente 2017 University of Nebraska-Lincoln

Towards The Development Of A Sustainable Soya Bean-Based Feedstock For Aquaculture, Hyunwoo Park, Steven Weier, Fareha Razvi, Pamela A. Peña, Neil A. Sims, Jennica Lowell, Cory Hungate, Karma Kissinger, Gavin Key, Paul Fraser, Jonathan Napier, Edgar B. Cahoon, Thomas Clemente

Faculty Publications from the Center for Plant Science Innovation

Soya bean (Glycine max (L.) Merr.) is sought after for both its oil and protein components. Genetic approaches to add value to either component are ongoing efforts in soya bean breeding and molecular biology programmes. The former is the primary vegetable oil consumed in the world. Hence, its primary usage is in direct human consumption. As a means to increase its utility in feed applications, thereby expanding the market of soya bean coproducts, we investigated the simultaneous displacement of marine ingredients in aquafeeds with soya bean-based protein and a high Omega-3 fatty acid soya bean oil, enriched with alpha-linolenic and ...


Compost Carryover: Nitrogen Phosphorous And Ft-Ir Analysis Of Soil Organic Matter, Dave J. R. Olsen, Jeffrey B. Endelman, Astrid R. Jacobson, Jennifer R. Reeve 2017 Sugar Research Australia

Compost Carryover: Nitrogen Phosphorous And Ft-Ir Analysis Of Soil Organic Matter, Dave J. R. Olsen, Jeffrey B. Endelman, Astrid R. Jacobson, Jennifer R. Reeve

Astrid Jacobson

Compost plays a central role in organic soil fertility plans but is bulky and costly to apply. Determining compost carryover is therefore important for cost-effective soil fertility planning. This study investigated two aspects of nutritive carryover [nitrogen and phosphorus (P)], and an indicator of non-nutritive carryover [soil organic matter (SOM)] to determine the residual effect of a one-time compost application applied at four rates in a corn-squash rotation. Crop yield was measured as an integrated carryover indicator of nutritive and non-nutritive effects. Functional groups of compost and SOM were investigated using FT-IR spectroscopy and soil organic carbon (SOC). While year ...


High Tunnel Tomato Variety Report Uri 2016, Andy Mark Radin 2016 Universityof Rhode Island

High Tunnel Tomato Variety Report Uri 2016, Andy Mark Radin

Rhode Island Agricultural Experiment Station Bulletin

No abstract provided.


Pumpkin Variety Trial Uri 2016, Rebecca Brown 2016 brownreb@uri.edu

Pumpkin Variety Trial Uri 2016, Rebecca Brown

Rhode Island Agricultural Experiment Station Bulletin

No abstract provided.


Butternut Squash Variety Trial Uri 2016, Rebecca Brown 2016 brownreb@uri.edu

Butternut Squash Variety Trial Uri 2016, Rebecca Brown

Rhode Island Agricultural Experiment Station Bulletin

No abstract provided.


Pesticide Residue Regulation: Analysis Of Food Quality Protection Act Implementation, Linda-Jo Schierow 2016 University of New Hampshire

Pesticide Residue Regulation: Analysis Of Food Quality Protection Act Implementation, Linda-Jo Schierow

RISK: Health, Safety & Environment

Dr. Schierow discusses the effects of a recent statute on food safety.


Economic Analysis Of Variable Rate Management For Corn And Soybean Systems, William D. Batchelor, Bruce A. Babcock, Alfred M. Blackmer, Richard M. Cruse, Thomas S. Colvin, Ramesh S. Kanwar, U. Sunday Tim 2016 Iowa State University

Economic Analysis Of Variable Rate Management For Corn And Soybean Systems, William D. Batchelor, Bruce A. Babcock, Alfred M. Blackmer, Richard M. Cruse, Thomas S. Colvin, Ramesh S. Kanwar, U. Sunday Tim

U. Sunday Tim

What is the potential payoff for farmers moving from traditional whole-field management or integrated crop management to precision farming? Using computer models, the investigators sought to analyze how inputs can be applied at optimal rates variably across a field in order to match inputs with crop needs. Over the long term, only modest increases were shown in gross returns from these practices. However, gross returns for individual years can be substantial.


Characterization Of Ground Nozzles For Pesticide Applications, Ryan Henry 2016 University of Nebraska - Lincoln

Characterization Of Ground Nozzles For Pesticide Applications, Ryan Henry

Theses, Dissertations, and Student Research in Agronomy and Horticulture

Pesticide applications are a common component of crop production systems in the United States (US). For row crop systems (e.g. corn, soybean, or wheat), pesticides are applied by ground, aerial, or chemigation methods. The exact method of pesticide delivery is not universally regulated/ prescribed in the US, and the equipment and application technique are largely defined by the individual applicator. A wide variety of choices and decisions must be made by applicators to result in a successful pesticide application. Examples of these choices include proper active ingredient(s), carrier volume and equipment (e.g. nozzle type, spacing, and operating ...


Impact Of Climate Change On Soybean Breeding Objectives, Theodore M. I. Hartman 2016 Iowa State University

Impact Of Climate Change On Soybean Breeding Objectives, Theodore M. I. Hartman

Meteorology Senior Theses

Changes in climate, mainly changes in temperature, precipitation, and carbon dioxide concentration are predicted to occur. These changes in climate will affect weather conditions that are vitally important in the growth and development of crops. Historically, yield increases have been observed in many crops, including Glycine max (soybean). This yield increase has been associated with deliberate breeding objectives designed to optimize plant performance for the contemporary climate. This deliberate breeding initiative has modified plant physiologic parameters. This study looks at how changes in soybean physiological parameters, through different cultivars, have attributed to observed yield increases and how future climate changes ...


Improved Production Systems For Common Bean On Phaeozem Soil In South-Central Uganda, Lance H. Goettsch, Andrew W. Lenssen, Russell S. Yost, Ebby S. Luvaga, Onesmus Semalulu, Moses Tenywa, Robert E. Mazur 2016 Iowa State University

Improved Production Systems For Common Bean On Phaeozem Soil In South-Central Uganda, Lance H. Goettsch, Andrew W. Lenssen, Russell S. Yost, Ebby S. Luvaga, Onesmus Semalulu, Moses Tenywa, Robert E. Mazur

Andrew W. Lenssen

Common bean (Phaseolus vulgaris L.) is the most important grain legume in Uganda. Beans managed under conventional systems range in yield from 500 to 800 kg ha-1, with a yield gap of about 75%. The objective of this study was to compare the productivity and net profitability of four bean cultivars grown under three management systems on Phaeozem soil (Mollisol) in Masaka District, Uganda. The experimental design was a randomized incomplete block in a split-plot arrangement. Management system was the whole-plot factor and included the Conventional Farmer (CFS), Improved Farmer (IFS), and High Input systems (HIS). Management systems differed for ...


Forage Intake And Wastage By Ewes In Pea/Hay Barley Swath Grazing And Bale Feeding Systems, Erin E. Nix, Devon L. Ragen, Janice G. P. Bowman, Rodney W. Kott, Mark K. Petersen, Andrew W. Lenssen, Patrick G. Hatfield, Emily C. Glunk 2016 Montana State University

Forage Intake And Wastage By Ewes In Pea/Hay Barley Swath Grazing And Bale Feeding Systems, Erin E. Nix, Devon L. Ragen, Janice G. P. Bowman, Rodney W. Kott, Mark K. Petersen, Andrew W. Lenssen, Patrick G. Hatfield, Emily C. Glunk

Andrew W. Lenssen

Harvested feed costs, particularly during the winter, are traditionally the highest input associated with a ruminant livestock operation. Although swath grazing has been practiced for over 100 years and literature exists for cattle use of swath grazing, no published results are available on use of swath grazing by sheep. Sixty mature, white-faced ewes were used in a completely randomized design repeated 2 years to evaluate whether feeding method (swath grazed or fed as baled hay in confinement) of intercropped field pea (Pisum sativum L.) and spring barley (Hordeum vulgare L.) forage affected ewe ADG (average daily gain), forage DMI (dry ...


Impact Of A Corn-Living Mulch Cropping System On Soil C- And N-Dynamics, Chumki Banik, Cynthia Bartel, David A. Laird, Kenneth J. Moore, Andrew W. Lenssen 2016 Iowa State University

Impact Of A Corn-Living Mulch Cropping System On Soil C- And N-Dynamics, Chumki Banik, Cynthia Bartel, David A. Laird, Kenneth J. Moore, Andrew W. Lenssen

Andrew W. Lenssen

Use of a living mulch in a continuous corn cropping system can potentially protect the soil from erosion and increase organic C inputs into the soil thereby enhancing soil quality and facilitating greater harvest corn stover for bio-energy production. The objective of this study is to evaluate soil C- and N-dynamics under a corn-living mulch system that includes a shallow rooted perennial cover crop, strip tillage, and spring burn down. This study hypothesized that a well managed shallow rooted perennial cover crop can improve soil quality by increasing soil C storage and synergistically distributing soil nutrients. Here we report impacts ...


Kenaf Productivity And Morphology. When Grown In Iowa And In Kentucky. Poster Number, Marie Bouguignon, Kenneth J. Moore, Andrew W. Lenssen, Sotirios V. Archontoulis, Ben M. Goff, Brian S. Baldwin 2016 Iowa State University

Kenaf Productivity And Morphology. When Grown In Iowa And In Kentucky. Poster Number, Marie Bouguignon, Kenneth J. Moore, Andrew W. Lenssen, Sotirios V. Archontoulis, Ben M. Goff, Brian S. Baldwin

Andrew W. Lenssen

Natural fibers are a promising alternative to synthetic fibers for reinforcing plastic or other composite materials, or fuel purposes. Kenaf (Hibiscus cannabinus L.), a fiber crop is grown to a limited extent in the U.S. predominantly in the Southern states. Producing kenaf in the Midwestern U.S. could provide a local source of these fibers for use in a number of manufactured products and potentially for use as a biofuel feedstock. The objectives of this study were to: 1) compare the productivity and the morphology of kenaf cultivars ‘Tainung 2’ and ‘Whitten’ when grown in Iowa and Kentucky and ...


Sheep Grazing Enhances Coarse Relative To Microbial Organic Carbon In Dryland Cropping Systems, Joy L. Barsotti, Upendra M. Sainju, Andrew W. Lenssen, Zach J. Miller, Patrick G. Hatfield 2016 United States Department of Agriculture

Sheep Grazing Enhances Coarse Relative To Microbial Organic Carbon In Dryland Cropping Systems, Joy L. Barsotti, Upendra M. Sainju, Andrew W. Lenssen, Zach J. Miller, Patrick G. Hatfield

Andrew W. Lenssen

Sheep (Ovis aries L.) grazing, a cost-effective method of weed control compared with herbicide application and tillage, may influence soil C fractions by consuming crop residue and weeds and returning C through feces and urine to the soil. We examined the effect of three weed management practices (sheep grazing, herbicide application, and tillage) and two cropping sequences (continuous spring wheat [Triticum aestivum L.] [CSW] and spring wheat-pea [Pisum sativum L.]/barley [Hordeum vulgare L.] mixture hay-fallow [W-P/B-F]) on soil microbial biomass C (MBC), potential C mineralization (PCM), and particulate organic C (POC) in relation to soil organic C (SOC ...


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