Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Plant Sciences (15)
- Peer-Reviewed Publications (11)
- Fertilizer technology (6)
- Aegle marmelos (5)
- Agriculture (4)
-
- Infrared (4)
- Ammi majus (3)
- Cover Crops (3)
- Flax (3)
- Irrigation (3)
- Micropropagation (3)
- Mycorrhiza (3)
- Rhizosphere (3)
- Synchrotron (3)
- Technology (3)
- Water Use (3)
- Water conservation (3)
- Wheat (3)
- Allelopathy -- Research Methods (2)
- Arabidopsis (2)
- Bael (2)
- Book Reviews (2)
- Cellular and Molecular Physiology (2)
- Container plant (2)
- Crop circle (2)
- Ethiopia. (2)
- Extractive metallurgy (2)
- Fungi (2)
- Gardening with Less Water (2)
- Genetic transformation (2)
- Publication Year
- Publication
-
- Robert Mikkelsen (21)
- Dr. Azamal Husen (15)
- Fathi Habashi (14)
- Nishanta Rajakaruna (14)
- Rajesh Pati (14)
-
- Gregory Keith Bartley Jr. (8)
- Ahmed Harb Rabia A.H. Rabia (7)
- Ted K. Raab (7)
- Dr. Omar Maghawri Ibrahim (5)
- Kunal Mandal (5)
- David A Bainbridge (4)
- David C. Nielsen (3)
- Onn Haji Hashim (3)
- Sandip S. Magdum (3)
- Brad M. Binder (2)
- Halijah Ibrahim (2)
- Jason D Nason (2)
- Jeffrey D. Weidenhamer (2)
- Rosna Binti Mat Taha (2)
- fouad Lemtiri-Chlieh (2)
- Burkhard Schulz (1)
- Ganesh Chandra (1)
- George Amponsah Annor Mr. (1)
- Henry R. Owen (1)
- James Gross (1)
- Jose L. Panero (1)
- Kingsley C Anukam (1)
- Luis FLORES (1)
- Michelle Hoffman (1)
- Noah D Hall (1)
Articles 31 - 60 of 148
Full-Text Articles in Entire DC Network
Do We Really Need New Policies? A Study On Soil Sealing In Egypt, Ahmed Harb Rabia
Do We Really Need New Policies? A Study On Soil Sealing In Egypt, Ahmed Harb Rabia
Ahmed Harb Rabia A.H. Rabia
Egypt has the lowest area of agricultural land per individual in Africa. The agricultural land stands for a total of approximately 3.5 million ha which characterized about 3.5% of the total area of Egypt in 2007. The urban encroachment over arable productive agricultural land in Egypt is common and is called (urban desertification). Therefore, the annual loss of arable land to urbanization is 1.2%. This indicates a serious situation to the agricultural area. the Academy of Scientific Research & Technology (1994) has reported that during the period from 1978 to 1984, the annual expansion rates of the dwelling area ranged …
What's In Your Nitrogen Budget?, Robert Mikkelsen
What's In Your Nitrogen Budget?, Robert Mikkelsen
Robert Mikkelsen
No abstract provided.
Mapping Soil Erosion Risk Using Rusle, Gis And Remote Sensing Techniques, Ahmed Harb Rabia A.H. Rabia
Mapping Soil Erosion Risk Using Rusle, Gis And Remote Sensing Techniques, Ahmed Harb Rabia A.H. Rabia
Ahmed Harb Rabia A.H. Rabia
Soil erosion is one of the major causes of land degradation in arid and semi-arid areas like Ethiopia, including Tigray Highlands, which is highly affected by the risk of desertification. Tackling on-site effects of soil erosion requires understanding of the rates of soil loss as well as identification of the major controlling factors that accelerate or slow down these processes. The study aims to quantify the soil loss by erosion process and to specify the main factor affecting the Erosion development in the study area. The Study area was Kilte Awulaelo District which is situated in the eastern part of …
Modeling Of Soil Sealing By Urban Sprawl In Wukro, Ethiopia Using Remote Sensing And Gis Techniques, Ahmed Harb Rabia A.H. Rabia
Modeling Of Soil Sealing By Urban Sprawl In Wukro, Ethiopia Using Remote Sensing And Gis Techniques, Ahmed Harb Rabia A.H. Rabia
Ahmed Harb Rabia A.H. Rabia
Soil sealing is the covering of the soil surface with materials like concrete and stone, as a result of new buildings, roads, parking places but also other public and private space. Soil sealing by urban sprawl continues to increase all over the world where the area of urbanized land is increasing even more rapidly than the population. The degree of sealing is associated to the land use type and the density of population. Techniques of Remote Sensing and Geographical Information System (GIS) have been used widely to measure urban sprawl and to analyze the spatial features and unique mechanism of …
Gis Spatial Modeling For Land Degradation Assessment In Tigray, Ethiopia., Ahmed Harb Rabia A.H. Rabia
Gis Spatial Modeling For Land Degradation Assessment In Tigray, Ethiopia., Ahmed Harb Rabia A.H. Rabia
Ahmed Harb Rabia A.H. Rabia
Land degradation can be described as reduction in the present and prospective land quality and production, due to natural or anthropogenic dynamics. This phenomenon is one of the most important problems facing farmers and decision makers in several countries. This study aims to use GIS spatial modeling to quantify land (physically and chemically) degradation in the study area based on remotely sensed and field survey’s data. A GIS spatial model has been developed based on the LADA- FAO methodology to apply a land degradation assessment in the study area. Final land degradation map has been produced by combining the outputs …
Simulation Of Barley Grain Yield Using Artificial Neural Networks And Multiple Linear Regression Models, Omar Maghawri Ibrahim Hassan
Simulation Of Barley Grain Yield Using Artificial Neural Networks And Multiple Linear Regression Models, Omar Maghawri Ibrahim Hassan
Dr. Omar Maghawri Ibrahim
Developing models for simulation of barley grain yield is important for making early prediction. To simulate barley grain yield, a simple and advanced modeling techniques were used based on a field experiment that was conducted using 40 foreign barley genetic resources from 2007/08 to 2008/09 winter seasons at Kalubia Governorate, Egypt. The barley genotypes were imported from International Center for Agricultural Research in Dry Areas (ICARDA), Syria. Artificial neural network (ANN) and multiple linear regression (MLR) models were developed to simulate barley grain yield. The models were constructed using the first year of field data and validated with the second …
Super Efficient Irrigation With Buried Clay Pots, David A. Bainbridge
Super Efficient Irrigation With Buried Clay Pots, David A. Bainbridge
David A Bainbridge
Buried clay pot irrigation was first described in an agricultural extension bulletin in China more than 2000 years ago. The clay pot provides demand responsive irrigation at very high efficiency. Clay pot irrigation can be 5-10 times more efficient than conventional irrigation. It is being used more widely in Asia, Africa, Latin American and the US.
Role Of Anthraquinones As A Marker And Maturity In Response To Adventitious Rooting Of Tectona Grandis, Azamal Husen Dr., Sayyada Khatoon
Role Of Anthraquinones As A Marker And Maturity In Response To Adventitious Rooting Of Tectona Grandis, Azamal Husen Dr., Sayyada Khatoon
Dr. Azamal Husen
No abstract provided.
The Philadelphia Award For 1960: Allston Jenkins, James Gross
The Philadelphia Award For 1960: Allston Jenkins, James Gross
James Gross
This biography of Allson Jenkins is part of a collective work for recipients of the Philadelphia Award. Allston Jenkins won the award in 1960 for his efforts in environmental conservation and preservation. He helped preserve the Tinicum Marsh, renamed the John Heinz National Wildlife Refuge, located in Philadelphia, PA and Delaware County.
Pyrite. History, Chemistry, And Metallurgy, Fathi Habashi
Pyrite. History, Chemistry, And Metallurgy, Fathi Habashi
Fathi Habashi
The Book covers the history of pyrite - - how it was a strategic mineral necessary for the production of elemental sulfur needed for making gunpowder for military purposes and for the production of SO2 needed for making sulfuric acid for the chemical industry. Now its presence is a nuisance in tailings ponds. The book also covers the processing of pyrite containing gold, its chemistry and technology, the processing of pyrite cinder for the production of a variety of metals, and its behaviour towards autotrophic microorganisms.
Propiconazole Is A Specific And Accessible Brassinosteroid (Br) Biosynthesis Inhibitor For Arabidopsis And Maize., Burkhard Schulz, Thomas Hartwig, Claudia Corvalan, Norman Best, Joshua Budka, Sunghwa Choe
Propiconazole Is A Specific And Accessible Brassinosteroid (Br) Biosynthesis Inhibitor For Arabidopsis And Maize., Burkhard Schulz, Thomas Hartwig, Claudia Corvalan, Norman Best, Joshua Budka, Sunghwa Choe
Burkhard Schulz
Brassinosteroids (BRs) are steroidal hormones that play pivotal roles during plant development. In addition to the characterization of BR deficient mutants, specific BR biosynthesis inhibitors played an essential role in the elucidation of BR function in plants. However, high costs and limited availability of common BR biosynthetic inhibitors constrain their key advantage as a species-independent tool to investigate BR function. We studied propiconazole (Pcz) as an alternative to the BR inhibitor brassinazole (Brz). Arabidopsis seedlings treated with Pcz phenocopied BR biosynthetic mutants. The steady state mRNA levels of BR, but not gibberellic acid (GA), regulated genes increased proportional to the …
Little Evidence For Local Adaptation To Soils Or Microclimate In The Postfire Recruitment Of Three Californian Shrubs, A Bieger, N Rajakaruna, S P. Harrison
Little Evidence For Local Adaptation To Soils Or Microclimate In The Postfire Recruitment Of Three Californian Shrubs, A Bieger, N Rajakaruna, S P. Harrison
Nishanta Rajakaruna
Background: Seedling recruitment following fire is an infrequent yet critical demographic transition for woody plants in Mediterranean ecosystems. Aims: Here we examine whether post-fire seedling recruitment of three widespread Californian chaparral shrubs is affected by local adaptation within an edaphically and topographically complex landscape. Methods: We reciprocally transplanted 6-month-old seedlings of Adenostema fasciculatum, Ceanothus cuneatus and Eriodictyon californicum to serpentine and sandstone soils, and cool northerly and warm southerly slopes. Results: At the age of 2 years, none of the species manifested higher survival or growth on ‘home’ compared with ‘away’ soils or slopes, indicating an absence of local adaptation …
Edaphic Adaptation Maintains The Coexistence Of Two Cryptic Species On Serpentine Soil, J M. Yost, T Barry, K M. Kay, N Rajakaruna
Edaphic Adaptation Maintains The Coexistence Of Two Cryptic Species On Serpentine Soil, J M. Yost, T Barry, K M. Kay, N Rajakaruna
Nishanta Rajakaruna
• Premise of the study: Divergent edaphic adaptation can contribute to reproductive isolation and coexistence between closely related species, yet we know little about how small-scale continuous edaphic gradients contribute to this phenomenon. We investigated edaphic adaptation between two cryptic species of California wildflower, Lasthenia californica and L. gracilis (Asteraceae), which grow in close parapatry on serpentine soil. • Methods: We reciprocally transplanted both species into the center of each species’ habitat and the transition zone between species. We quantified multiple components of fitness and used aster models to predict fitness based on environmental variables. We sampled soil across the …
Investigation Of The Importance Of Rock Chemistry For Saxicolous Lichen Communities Of The New Idria Serpentinite Mass, San Benito County, California, Usa, N Rajakaruna, K Knudsen, A Fryday, R E. O’Del, N Pope, F C. Olday, S Woolhouse
Investigation Of The Importance Of Rock Chemistry For Saxicolous Lichen Communities Of The New Idria Serpentinite Mass, San Benito County, California, Usa, N Rajakaruna, K Knudsen, A Fryday, R E. O’Del, N Pope, F C. Olday, S Woolhouse
Nishanta Rajakaruna
Although several lichen inventories exist for European ultramafic sites, only four surveys of serpentine lichens for North America have been published to date. Of those, only one has been conducted in California. We conducted a survey of saxicolous lichens from ultramafic rocks (including nephrite, partially serpentinized peridotite, and serpentinite) and non-ultramafic rocks (including silica-carbonate, shale, and sandstone) at the New Idria serpentinite mass, San Benito County, California. X-ray Fluorescence Analysis of the rocks from which the lichens were collected revealed significant elemental differences between the ultramafic and non-ultramafic rocks for 26 of the 32 major and trace elements analyzed. We …
Mycorrhizal Colonization Of Hypericum Perforatum L. (Hypericaceae) On Adjacent Serpentine And Granite Outcrops On The Deer Isles, Maine, Usa, N Davoodian, J Bosworth, N Rajakaruna
Mycorrhizal Colonization Of Hypericum Perforatum L. (Hypericaceae) On Adjacent Serpentine And Granite Outcrops On The Deer Isles, Maine, Usa, N Davoodian, J Bosworth, N Rajakaruna
Nishanta Rajakaruna
Given the paucity of literature on plant-fungal interactions on serpentine soils and limited investigation of serpentine geoecology in eastern North America, we examined mycorrhizal colonization of Hypericum perforatum from adjacent serpentine and granite outcrops on the Deer Isles, ME to determine whether plants were differentially colonized based on substrate. We coincided our sampling with three phenologic stages of H. perforatum (preflowering, flowering, postflowering) to determine possible differences in colonization based on plant phenology. The levels of mycorrhizal colonization in H. perforatum were not significantly different between serpentine and granite sites, while levels of colonization in postflowering plants were significantly higher …
Stressors And Threats To The Flora Of Acadia National Park, Maine: Current Knowledge, Information Gaps, And Future Directions, T B. Harris, N Rajakaruna, S J. Nelson, P D. Vaux
Stressors And Threats To The Flora Of Acadia National Park, Maine: Current Knowledge, Information Gaps, And Future Directions, T B. Harris, N Rajakaruna, S J. Nelson, P D. Vaux
Nishanta Rajakaruna
Stressors and threats to the flora of Acadia National Park, Maine: Current knowledge, information gaps, and future directions. J. Torrey Bot. Soc. 139: 323–344. 2012.— Acadia National Park is a center of plant diversity in northeastern North America. The Park's varied habitats and flora are sensitive to a number of natural and anthropogenic perturbations. Stressors such as invasive plants, pest and pathogens, ozone, acidic fog and sulfur deposition, nitrogen deposition, heavy metals, fire and fire suppression, over-browsing, visitor use, hurricanes, and climate change have all had effects on the Park's habitats and plant species at some point and it is …
First Report Of Hog-Plum (Spondias Pinnata) Leaf Spot Disease, Kunal Mandal
First Report Of Hog-Plum (Spondias Pinnata) Leaf Spot Disease, Kunal Mandal
Kunal Mandal
Hog–plum is a tree species with edible fruits. The plant is naturally distributed in the tropical areas of the Indian subcontinent. Our effort to introduce it in the semi– arid conditions of western India failed as the plants developed severe shot–hole type leaf spot symptoms. Association of a fungus with the disease was detected and its pathogenicity was established. The pathogen was identified to the genus level (Colletotrichum) based on the morphological and molecular markers.
Construction Of The Next Generation Of Energy Efficient Light Boxes - Sponsored By Bayer Environmental Science, Gregory Keith Bartley Jr.
Construction Of The Next Generation Of Energy Efficient Light Boxes - Sponsored By Bayer Environmental Science, Gregory Keith Bartley Jr.
Gregory Keith Bartley Jr.
This short presentation includes an overview of features that went into constructing a new type of light box technology utilizing low-power usage LEDs and Low Density flexible Polymers. This light box was constructed for digital image analysis of plant health and ground cover using a Canon Powershot G12 camera and Sigma Scan Digital Image Analysis Software.
Construction Of A Mobile Spectrophotometer For Mapping Plant Health: Combining Crop Circle™ And Gps Technology, Gregory Keith Bartley Jr., Brandon J. Horvath
Construction Of A Mobile Spectrophotometer For Mapping Plant Health: Combining Crop Circle™ And Gps Technology, Gregory Keith Bartley Jr., Brandon J. Horvath
Gregory Keith Bartley Jr.
With the introduction of GPS technology, came the ability to produce maps of plant cover and health over large areas. By correlating the reflectance values of a plant with its respective GPS coordinates, we can form a bird’s eye view of relative plant health using different colors. The commercialization of high precision GPS receivers has allowed researchers to plot these maps with increased accuracy, limiting error to less than 1 inch.
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 …
A Preliminary Study Of The Vegetation Of Vernal Pools Of Acadia National Park, Maine, U.S.A, Brett Ciccotelli, Tanner B. Harris, Bruce Connery, Nishanta Rajakaruna
A Preliminary Study Of The Vegetation Of Vernal Pools Of Acadia National Park, Maine, U.S.A, Brett Ciccotelli, Tanner B. Harris, Bruce Connery, Nishanta Rajakaruna
Nishanta Rajakaruna
We conducted a preliminary floristic study of six vernal pools in Acadia National Park on Mount Desert Island, Maine. Plant species were recorded on three sampling dates from April to October, 2008. Sixty-five vascular plant species from 26 families were recorded. Of these, 27 are considered occasional or uncommon in Acadia National Park. Thirteen species are new reports for vernal pools in the northeastern United States. This represents the first published study of the vernal pool flora of Acadia National Park.
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.
Silicon - The Benefits Of A Non-Essential Plant Nutrient, Gregory Keith Bartley Jr.
Silicon - The Benefits Of A Non-Essential Plant Nutrient, Gregory Keith Bartley Jr.
Gregory Keith Bartley Jr.
No abstract provided.
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 …
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 …
Rejuvenation And Adventitious Rooting In Coppice-Shoot Cuttings Of Tectona Grandis As Affected By Stock-Plant Etiolation, Azamal Husen
Rejuvenation And Adventitious Rooting In Coppice-Shoot Cuttings Of Tectona Grandis As Affected By Stock-Plant Etiolation, Azamal Husen
Dr. Azamal Husen
No abstract provided.
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 …
Different Chemically Substituted Chitooligosaccharides Inhibit Beta-Secretase Activity, Rosna Binti Mat Taha
Different Chemically Substituted Chitooligosaccharides Inhibit Beta-Secretase Activity, Rosna Binti Mat Taha
Rosna Binti Mat Taha
Chitooligosaccharide or COS is a kind of oligosaccharide that is an integral part of the nervous system. COS is synthesized by chemical substitution and derived AE-COS, DEAE-COS and DMAE-COS that are being shown on IC(50) value. AE-COS and DMAE-COS exhibited four fold less inhibition than DEAE-COS. In addition, non-competitive inhibitor was identified via a Dixon plot and the Ki inhibition constant (100 mu g/mL). We declared, chemical substitution of COS is a water soluble human safe BACE-1 inhibitor.
Metalurgia Extractiva Y Política Nacional, Fathi Habashi
Metalurgia Extractiva Y Política Nacional, Fathi Habashi
Fathi Habashi
Should a country export its mineral wealth in form of concentrates or should it locally treat its ores to produce metals as final products? In the past centuries pyrometallurgy was the only route to extract metals from ores and this required a large capital investment many countries could not afford to raise. This situation encouraged marketing of concentrates. Today, metallurgists have the option to use the hydrometallurgical route to process ores and concentrates at a reasonable capital investment. This opened the way to the possibility of processing ores locally. When need arises to increase production new units can be added …
Lichens Of Callahan Mine, A Copper And Zinc-Enriched Superfund Site In Brooksville, Maine, U.S.A., Nishanta Rajakaruna, Tanner B. Harris, Stephen R. Clayden, Alison C. Dibble, Fred S. Olday
Lichens Of Callahan Mine, A Copper And Zinc-Enriched Superfund Site In Brooksville, Maine, U.S.A., Nishanta Rajakaruna, Tanner B. Harris, Stephen R. Clayden, Alison C. Dibble, Fred S. Olday
Nishanta Rajakaruna
Metal-enriched habitats often harbor physiologically distinct biotas able to tolerate and accumulate toxic metals. Plants and lichens that accumulate metals have served as effective indicators of ecosystem pollution. Whereas the diversity of metal-tolerant lichens has been well documented globally, the literature of metal-tolerant lichen communities for eastern North America is limited. We examined the lichen flora of the Callahan Mine, a Cu-, Pb-, and Zn-enriched superfund site in Brooksville, Hancock County, Maine, U.S.A. Through collections along transects across metal-contaminated areas of the mine, we documented 76 species of lichens and related fungi. Fifty species were saxicolous, 26 were terricolous. Forty-three …