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Articles 1 - 11 of 11
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Constructing New Technology: The Crop Circle Gps Cart In Pictures, Gregory Keith Bartley Jr., Brandon J. Horvath
Constructing New Technology: The Crop Circle Gps Cart In Pictures, Gregory Keith Bartley Jr., Brandon J. Horvath
Gregory Keith Bartley Jr.
The crop circle spectrometer represents a breakthrough in unbiased sensor data. Unlike traditional passive sensors, it pulses light at a speed of 20,000 times per second. With this comes the ability of these filters to discern reflectance measurements from that of natural sunlight, allowing it to be used in environments of sun, shade, and even darkness. From these various reflectance values at different wavelengths, we get measurements of plant health known as vegetation indices. And different vegetation indices can tell us different things about the health of a plant. Couple this with the recent advances in GPS technology, we can …
Sheep Grazing In A Wheat–Fallow System Affects Dryland Soil Properties And Grain Yield, Upendra M. Sainju, Andrew W. Lenssen, Hayes B. Goosey, Erin Snyder, Patrick G. Hatfield
Sheep Grazing In A Wheat–Fallow System Affects Dryland Soil Properties And Grain Yield, Upendra M. Sainju, Andrew W. Lenssen, Hayes B. Goosey, Erin Snyder, Patrick G. Hatfield
Andrew W. Lenssen
Sheep (Ovis aries L.) grazing, an effective method of controlling weeds and pests in a wheat (Triticum aestivum L.)–fallow system, may affect dryland soil properties and wheat yield. We evaluated the effects of fallow management for weed control and soil water conservation (sheep grazing, herbicide application [chemical], and tillage [mechanical]) and cropping sequence (continuous spring wheat [CSW], spring wheat–fallow [SW-F], and winter wheat–fallow [WW-F]) on soil nutrients and chemical properties in the 0- to 60-cm depth and wheat yield. The experiment was conducted in a Blackmore silt loam from 2004 to 2008 in southwestern Montana. Soil P and K concentrations …
Whole-Body And Muscle Protein Metabolism Are Not Affected By Acute Deviations From Habitual Protein Intake In Older Men: The Hormonal Regulators Of Muscle And Metabolism In Aging (Horma) Study, Kevin E. Yarasheski, Carmen Castaneda-Sceppa, Jiaxiu He, Miwa Kawakubo, Shalender Bhasin, Ellen F. Binder, E. Todd Schroeder, Ronenn Roubenoff, Stan P. Azen, Fred R. Sattler
Whole-Body And Muscle Protein Metabolism Are Not Affected By Acute Deviations From Habitual Protein Intake In Older Men: The Hormonal Regulators Of Muscle And Metabolism In Aging (Horma) Study, Kevin E. Yarasheski, Carmen Castaneda-Sceppa, Jiaxiu He, Miwa Kawakubo, Shalender Bhasin, Ellen F. Binder, E. Todd Schroeder, Ronenn Roubenoff, Stan P. Azen, Fred R. Sattler
Carmen Castaneda-Sceppa
Background: Acute deviations in protein intake before the quantification of protein kinetics in older humans may explain the controversy over the effects of older age on muscle protein synthesis and proteolysis rates. Objective: We hypothesized that an acute decrease in protein intake from the habitual intake is associated with lower muscle protein synthesis and higher proteolysis rates, whereas an acute increase in protein intake from the habitual intake is associated with higher muscle protein synthesis and lower proteolysis rates. Design: In 112 community-dwelling healthy men aged 65–90 y, we quantified resting whole-body [1,2-13C2]leucine kinetics, muscle mixed protein fractional synthesis rates …
Convergence Of Agriculture And Energy: Iii. Considerations In Biodiesel Production, Jon Van Gerpen, Allan Gray, Brent H. Shanks, Beth Calabotta, Drew Kershen, Alan Weber, Richard Joost, Todd A. Peterson
Convergence Of Agriculture And Energy: Iii. Considerations In Biodiesel Production, Jon Van Gerpen, Allan Gray, Brent H. Shanks, Beth Calabotta, Drew Kershen, Alan Weber, Richard Joost, Todd A. Peterson
Drew L. Kershen
Concern about rising prices and unstable sources of petroleum fuels is driving the search for U.S. domestically produced, renewable transportation fuels, such as biodiesel. Federal incentives of up to $1.10 per gallon have been supplemented by additional incentives and mandated biodiesel use in many states. The Renewable Fuel Standard in the Energy Independence and Security Act of 2007 requires the domestic use of 1 billion gallons of biomass-based diesel fuel by 2012, most of which likely will be biodiesel. U.S. biodiesel production is primarily from soybean oil, but recent high prices have forced many producers to use lower-cost feedstocks such …
Magnesium: An Overlooked Nutrient?, Robert Mikkelsen
Magnesium: An Overlooked Nutrient?, Robert Mikkelsen
Robert Mikkelsen
Magnesium nutrition of plants is frequently overlooked and shortages can adversely impact plant growth. Many essential functions require adequate Mg supplies... the most visible being its role in chlorophyll and photosynthesis... but less visible reactions are also dependent on an adequate supply of Mg. When needed, a variety of soluble and slowly soluble Mg sources are available to meet crop demands.
Dryland Soil Carbon Dynamics Under Alfalfa And Durum-Forage Cropping Sequences, Upendra M. Sainju, Andrew W. Lenssen
Dryland Soil Carbon Dynamics Under Alfalfa And Durum-Forage Cropping Sequences, Upendra M. Sainju, Andrew W. Lenssen
Andrew W. Lenssen
Forages grown in rotation with or without cereals to sustain dryland soil water content and crop production may influence C dynamics. We evaluated the effect of alfalfa (Medicago sativa L.) and durum (Triticum turgidum L.)-annual forage cropping sequences on above- (stems + leaves) and belowground (roots) biomass C inputs and dryland soil organic C (SOC), particulate total C (PTC), microbial biomass C (MBC), and potential C mineralization (PCM) at the 0–120 cm depth. Cropping sequences were continuous alfalfa (CA), durum-barley (Hordeum vulgare L.) hay (D-B), durum-foxtail millet (Setaria italica L.) hay (D-M), durum-Austrian winter pea (Pisum sativum L.)/barley mixture hay …
Literature Review - Pigments In Plant Health, Gregory Keith Bartley Jr.
Literature Review - Pigments In Plant Health, Gregory Keith Bartley Jr.
Gregory Keith Bartley Jr.
The solar radiation received at the Earth’s surface helps power the photochemical processes in photosynthesis. However, under sunlight, photosynthetic organisms are unavoidably exposed to potentially harmful levels of ultraviolet and visible light radiation. Consequently, plants have developed many mechanisms for the avoidance and dissipation of excess light energy. The growth of crops under increased solar irradiance during sub- and supra-optimal temperature conditions is an obstacle for increasing seasonal crop production in the transition zone. New methods for reducing the photoinhibitory effects of solar irradiation have been observed in the field of turfgrass. Through the application of pigment compounds to the …
Soil Nitrogen Dynamics Under Dryland Alfalfa And Durum–Forage Cropping Sequences, Upendra M. Sainju, Andrew W. Lenssen
Soil Nitrogen Dynamics Under Dryland Alfalfa And Durum–Forage Cropping Sequences, Upendra M. Sainju, Andrew W. Lenssen
Andrew W. Lenssen
Forages grown in rotation with or without cereals to sustain dryland soil water content and crop production may influence N dynamics. We evaluated the effect of alfalfa (Medicago sativa L.) and durum (Triticum turgidum L.)–annual forage cropping sequences on above- (stems + leaves) and belowground (roots) biomass N, dryland soil total N (STN), particulate organic N (PON), microbial biomass N (MBN), potential N mineralization (PNM), NH4–N, and NO3–N contents at the 0- to 120-cm depth in northeastern Montana from 2002 to 2005. Cropping sequences were continuous alfalfa (CA), durum–barley (Hordeum vulgare L.) hay (D-B), durum–foxtail millet (Setaria italica L.) hay …
Phenotypic, Pathogenic, Molecular And Phylogenetic Comparisons Of Bacteria Causing Aloe Rot From Three Countries, Yogeshwar Kumar, Jatindra Nath Samanta, Kunal Mandal, Narendra A. Gajbhiye
Phenotypic, Pathogenic, Molecular And Phylogenetic Comparisons Of Bacteria Causing Aloe Rot From Three Countries, Yogeshwar Kumar, Jatindra Nath Samanta, Kunal Mandal, Narendra A. Gajbhiye
Kunal Mandal
Bacterial soft rot disease of Aloe caused by heterogeneous genus Erwinia was reported from different parts of the world. In the recent past the genus underwent major taxonomic modifications. In the present study, four Aloe pathogenic bacterial strains isolated from India, The Netherlands and Yugoslavia have been compared. Different cultural, biochemical, physiological and pathological characters and protein/lipid profiles indicated that the strains belonged to two different genera, Pectobacterium and Dickeya. Species specific amplification of pel gene sequences also supported this. Phylogenetic analysis of rRNA gene (rDNA) sequence placed these Dickeya strains close to D. dieffenbachiae and D. zeae. On the …
Geologic Constraints On Rain-Fed Qocha Reservoir Agricultural Infrastructure,Northern Lake Titicaca Basin, Peru, Nathan Craig, Mark Aldenderfer, Catherine Rigsby, Paul Baker, Luis A. Flores
Geologic Constraints On Rain-Fed Qocha Reservoir Agricultural Infrastructure,Northern Lake Titicaca Basin, Peru, Nathan Craig, Mark Aldenderfer, Catherine Rigsby, Paul Baker, Luis A. Flores
Luis FLORES
This paper reports new data on qocha ponds from the Rio PucaraeAzángaro interfluvial zone, northern Lake Titicaca Basin, Peru. Qocha are a little known form of Andean agriculture that developed around 800e500 B.C. and remain in use today. Prior estimates suggested that in the study area, there were more than 25,000 qocha. While most Andean sunken beds are excavated to reach groundwater, qocha are rainfed ponds. How these rain-fed ponds functioned has been an open question, but one that is answered in part by research presented in this paper. We suggest that a thick impermeable stratum of clay that was …
Tillage Effects On Dryland Soil Physical Properties In Northeastern Montana, J. D. Jabro, Upendra M. Sainju, Andrew W. Lenssen, R. G. Evans
Tillage Effects On Dryland Soil Physical Properties In Northeastern Montana, J. D. Jabro, Upendra M. Sainju, Andrew W. Lenssen, R. G. Evans
Andrew W. Lenssen
We evaluated the effect of no tillage (NT) and conventional tillage (CT) on soil penetration resistance (PR), bulk density (BD), gravimetric moisture content (MC), and saturated hydraulic conductivity (Ks) during the fallow phase of a spring wheat–fallow rotation. The study was conducted on two soils mapped as Williams loam at the Froid and Sidney sites. Soil measurements were made on 19 May, 23 June, and 4 August 2005 at the Froid site and on 6 June and 8 July 2005 at the Sidney site. Tillage had no effect on either soil properties except on the PR at Sidney. However, soil …