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Articles 1111 - 1140 of 16207
Full-Text Articles in Earth Sciences
Fructans From Elongating Leaf Bases Are A Source Of Carbon For Regrowth After Defoliation In Lolium Perenne, A. Morvan-Bertrand, J. C. Avice, M. P. Prud'homme
Fructans From Elongating Leaf Bases Are A Source Of Carbon For Regrowth After Defoliation In Lolium Perenne, A. Morvan-Bertrand, J. C. Avice, M. P. Prud'homme
IGC Proceedings (1977-2023)
A detailed study of carbohydrate metabolism in perennial ryegrass (Lolium perenne L.) during the first 48 h of regrowth showed that the decline in fructan concentration occurred not only in the differentiation zone (30-60 mm from leaf base), but also in the elongation zone of the elongating leaf bases. Unlike other soluble carbohydrates, the net deposition rate of fructose remained positive and even rose during the first day following defoliation. FEH (fructan exohydrolase) activity, which was maximum in the differentiation zone before defoliation, increased in all segments but peaked in the elongation zone after defoliation. Taken all together, these …
Effect Of Climatic Factors On The Plant Population Dynamics In Temperate Pasture Implantation, B. Martin, R. Refi, S. Montico, M. Costanzo
Effect Of Climatic Factors On The Plant Population Dynamics In Temperate Pasture Implantation, B. Martin, R. Refi, S. Montico, M. Costanzo
IGC Proceedings (1977-2023)
The objective of this experiment was to determine the environmental influence on seedling emergence of alfalfa and fescue in mixture. We hypothesized that the temperature and precipitation data could be used to estimate field emergence of alfalfa and fescue. A field trial was carried out at Zavalla, Argentina and consisted of sowing a tall fescue – alfalfa mixture at different seeding date (March, April and June). Relationships between the range of temperature, rainfalls and alfalfa and fescue seedling emergence were described by linear regression models. Patterns of emergence and death of alfalfa and fescue seedling were found in the different …
Mgrre_Pureoilscouttickets_Veenstra_1_21127003220000, Mgrre
Mgrre_Pureoilscouttickets_Veenstra_1_21127003220000, Mgrre
Legacy Scout Tickets from Pure Oil Company
No abstract provided.
Seed Production And Quality Of Buffelgrass (Cenchrus Ciliaris) Selections, N. F. G. Rethman, W. H. Boshoff
Seed Production And Quality Of Buffelgrass (Cenchrus Ciliaris) Selections, N. F. G. Rethman, W. H. Boshoff
IGC Proceedings (1977-2023)
As seed production and quality are critical considerations in the commercialization of new cultivars, an evaluation programme of promising Cenchrus ciliaris (Buffelgrass) accessions placed particular emphasis on these parameters. Accessions identified for registration proved to be superior in both respects, although storage of seed or cleaning of fresh seed reduced the differences in germination between accessions. The refinement of seed cleaning processes should receive greater emphasis by commercial concerns.
Effect Of The Hierarchical Position Of Individuals In A Medicago Sativa Stand On Shoot Respiration, M. Lötscher, Hans Schnyder
Effect Of The Hierarchical Position Of Individuals In A Medicago Sativa Stand On Shoot Respiration, M. Lötscher, Hans Schnyder
IGC Proceedings (1977-2023)
The influence of the hierarchical position on the relationship between C gains and C losses (respiration) of individuals was investigated in a alfalfa (Medicago sativa) stand. The hierarchical position that an individual occupied was defined by its height relative to the stand height. Stands were established by arranging potted individual plants at a density of 400 plants m-2. Stands were grown in growth cabinets. 13C steady-state labelling was used to assess C fixation (Cnew) by individuals during a photoperiod of 16 h. Respiration of shoots was measured during the following 8 h dark …
Patterns Of Development And Nitrogen Reserves Mobilization During Regrowth Of Defoliated Clover, F. Le Dily, E. Goulas, P. Lainé, E. Le Deunff
Patterns Of Development And Nitrogen Reserves Mobilization During Regrowth Of Defoliated Clover, F. Le Dily, E. Goulas, P. Lainé, E. Le Deunff
IGC Proceedings (1977-2023)
Contribution of nitrogen reserves to regrowth following defoliation was studied in white clover plants (Trifolium repens) according to the morphological pattern of differentiation of the aerial parts during the same period. Low temperature and short day lengths were used as a pre-treatment in order to increase branching and enhance new sites of leaf production during a further 25 d period of regrowth. Pre-treated plants exhibited a large reduction in leaf area largely counterbalanced with a high increase in leaf pool size during the first 10 d of regrowth. The mobilization of nitrogen reserves during regrowth of defoliated clover …
Resistance To Drought In Shore Elurope (Aeluropus Litoralis) And Weeping Alkaligrass (Puccinellia Distans), Mohammad Jafari, A. G. Firouzabadi
Resistance To Drought In Shore Elurope (Aeluropus Litoralis) And Weeping Alkaligrass (Puccinellia Distans), Mohammad Jafari, A. G. Firouzabadi
IGC Proceedings (1977-2023)
Two rangeland grass species, Shore Elurope (Aeluropus litoralis) and Weeping Alkaligrass (Puccinellia distans) were studied. The research was done under a split plot experiment and completely randomized design. Plants were grown under two irrigation treatments (seven and fourteen day periods of irrigation treatments). Morphological response included determination of wilting percentage, leaf water potential, production of yield, root dry weight, weight ratio of root/stem and finally total dry weight of species. Anatomical studies included leaf descriptive structure such as comparison of stomata and their density in area unit, study of vascular structure, mesophyl tissues and epiderm. Results …
Mgrre_Pureoilscouttickets_Kinster_1_21127005020000, Mgrre
Mgrre_Pureoilscouttickets_Kinster_1_21127005020000, Mgrre
Legacy Scout Tickets from Pure Oil Company
No abstract provided.
Investigations Of Trace Element Titanium In Silica Minerals, Zachary Robert Osborne
Investigations Of Trace Element Titanium In Silica Minerals, Zachary Robert Osborne
Dissertations - ALL
Quartz is a common mineral in many igneous, metamorphic, and sedimentary rocks because it is stable over a wide range of pressure (P) and temperature (T) conditions; therefore, quartz is an excellent mineral to target for thermobarometric uses. Thermobarometry is the quantitative determination of the pressure (baro-) and temperature (thermo-) conditions at which a natural rock sample reached chemical equilibrium. This dissertation contains three chapters describing mineral synthesis experiments that quantify and define the trace-element solubility behavior of titanium (Ti) in the silica minerals quartz and coesite, to advance the understanding and application of trace-element thermobarometry.Chapter 1 details the experiments …
Evaluating The Controls Of Neogene Exhumation In The Tropical Northern Andes (Colombia), Nicolas Perez Consuegra
Evaluating The Controls Of Neogene Exhumation In The Tropical Northern Andes (Colombia), Nicolas Perez Consuegra
Dissertations - ALL
Understanding how tectonic and climatic forces influence erosion and shape mountains is important to understand the evolution of the landscapes through earth's history. This dissertation aims to determine how do tectonic processes and climate variability interact to shape Earth's tropical mountains. In chapter 1, I studied the Eastern Cordillera of the Northern Andes, a mountain range located in Colombia in the tropics of South America. To obtain exhumation rates, I used thermochronology, which is a method that records—over timescales of millions of years—the rate at which rocks located at great depths within the Earth cool as they are transported to …
Analysis Of Rock Varnish From The Mojave Desert By Handheld Laser-Induced Breakdown Spectroscopy, Russell S. Harmon, Daria Khashchevskaya, Michelle Morency, Lewis A. Owen, Morgan Jennings, Jeffrey R. Knott, Jason M. Dortch
Analysis Of Rock Varnish From The Mojave Desert By Handheld Laser-Induced Breakdown Spectroscopy, Russell S. Harmon, Daria Khashchevskaya, Michelle Morency, Lewis A. Owen, Morgan Jennings, Jeffrey R. Knott, Jason M. Dortch
Faculty, Staff, and Affiliated Publications--KGS
Laser-induced breakdown spectroscopy (LIBS) is a form of optical emission spectroscopy that can be used for the rapid analysis of geological materials in the field under ambient environmental conditions. We describe here the innovative use of handheld LIBS for the in situ analysis of rock varnish. This thinly laminated and compositionally complex veneer forms slowly over time on rock surfaces in dryland regions and is particularly abundant across the Mojave Desert climatic region of east-central California (USA). Following the depth profiling examination of a varnished clast from colluvial gravel in Death Valley in the laboratory, our in situ analysis of …
Mgrre_Pureoilscouttickets_Snow, Bert_1_21127002200000, Mgrre
Mgrre_Pureoilscouttickets_Snow, Bert_1_21127002200000, Mgrre
Legacy Scout Tickets from Pure Oil Company
No abstract provided.
Microbial Activity Responses To Water Stress In Agricultural Soils From Simple And Complex Crop Rotations, Jorg Schnecker, D. Boone Meeden, Francisco Calderon, Michel Cavigelli, R. Michael Lehman, Lisa K. Tiemann, A. Stuart Grandy
Microbial Activity Responses To Water Stress In Agricultural Soils From Simple And Complex Crop Rotations, Jorg Schnecker, D. Boone Meeden, Francisco Calderon, Michel Cavigelli, R. Michael Lehman, Lisa K. Tiemann, A. Stuart Grandy
Faculty Publications
Increasing climatic pressures such as drought and flooding challenge agricultural systems and their management globally. How agricultural soils respond to soil water extremes will influence biogeochemical cycles of carbon and nitrogen in these systems. We investigated the response of soils from long-term agricultural field sites under varying crop rotational complexity to either drought or flooding stress. Focusing on these contrasting stressors separately, we investigated soil heterotrophic respiration during single and repeated stress cycles in soils from four different sites along a precipitation gradient (Colorado, MAP 421 mm; South Dakota, MAP 580 mm; Michigan, MAP 893 mm; Maryland, MAP 1192 mm); …
Allelopathic Influence Of Eragrostis Curvula Water Extract On Seed Germination And Seedling Growth Of Two Other Species, R. W. Coelho, R. E. Schmidt
Allelopathic Influence Of Eragrostis Curvula Water Extract On Seed Germination And Seedling Growth Of Two Other Species, R. W. Coelho, R. E. Schmidt
IGC Proceedings (1977-2023)
Weeping lovegrass (Eragrostis curvula Schrad. Nees) is a very agressive tropical species and does not grow well with other species. This study was set up to investigate the allelopathic effect of various extract concentrations of weeping lovegrass on seed germination of white clover (Trifolium repens L.) and bentgrass (Agrostis stolonifera L.) and the seedling development of white clover. Labotatory and growth chamber studies were conducted. Extract concentrations of 13.6, 27.2, 40.8, 54.4, and 62.0 g/100mL of water were studied. Treatments were arranged in a completely ramdomized design with three replications. The allelopathic effect of weeping lovegrass was …
Effect Of Aging In Tillers Of Panicum Maximum On Leaf Elongation Rate, D. D. Carvalho, C. Matthew, J. Hodgson
Effect Of Aging In Tillers Of Panicum Maximum On Leaf Elongation Rate, D. D. Carvalho, C. Matthew, J. Hodgson
IGC Proceedings (1977-2023)
Two cultivars of Guinea grass (P. maximum, Jacq.), Mombaça and Tanzânia, were cultivated in five litre pots, as single plants, in a green house. Plants were subjected to three defoliation levels (100, 200 and 400 mm height) for five successive monthly harvests. The experimental design was a 3x2 randomised block with five replicates. Three types of tiller (main, primary and secondary) were selected, at random, on each plant and leaf elongation rate (LER) above cutting height was measured, weekly, between harvests. There were significant differences (P < 0.05) in LER between tiller types in cv. Mombaça in all periods, but only in period two in cv. Tanzânia. In the last period tillers were classified, at random, as old (over four months age) mature (between two and four months) and young (between one and two months). Old tillers had a lower (P < 0.05) LER than the other two categories in both cultivars and lower (P < 0.05) SLA (specific leaf area) in Mombaça.
Dormant Bud Development In Phalaris Aquatica L., Brendan R. Cullen, P. E. Quigley, D. F. Chapman
Dormant Bud Development In Phalaris Aquatica L., Brendan R. Cullen, P. E. Quigley, D. F. Chapman
IGC Proceedings (1977-2023)
The formation of dormant buds is critical to the summer survival of phalaris (Phalaris aquatica L.) in pastures. Dormant buds are formed on the base of reproductive tillers as they develop in spring. This project aimed to determine the seasonal pattern of dormant bud development and the influence of grazing management on bud dynamics. Approximately three buds per reproductive tiller were formed in the spring and early summer period. These buds responded to summer rainfall, with one third of buds becoming active following a 15-mm rainfall event in mid summer. In the following growing season, on average, 1.5 buds …
Tillering Dynamics Of Panicum Maximum Jacq. Cv. Tanzania-1 After Grazing, Rodrigo A. Barbosa, Domicio Nascimento Jr., Valéria P. B. Euclides, A. J. Regazzi, D. M. Fonseca
Tillering Dynamics Of Panicum Maximum Jacq. Cv. Tanzania-1 After Grazing, Rodrigo A. Barbosa, Domicio Nascimento Jr., Valéria P. B. Euclides, A. J. Regazzi, D. M. Fonseca
IGC Proceedings (1977-2023)
Tillering dynamics and tiller dry matter weight from Tanzania grass (Panicum maximum cv. Tanzania-1) were evaluated in two post-grazing stubbles (High Post-grazing Stubble – HPS-3.6 t of DM/ha and Low Post-grazing Stubble – LPS-2.3 t of DM/ha). There was no difference between post-grazing stubbles for decapitated axillary and basal remainder and new axillary tillers. The LPS presented greater number of new basal tillers. The rate of appearance of new basal and axillary tillers decreased with time after grazing. There were differences between the treatments on tiller dry matter weight, and greater values were found in the high post-graze stubble.
Flowering Distribution Pattern In White Clover Cultivars, B. S. Rosso, E. M. Pagano, P. Rimieri
Flowering Distribution Pattern In White Clover Cultivars, B. S. Rosso, E. M. Pagano, P. Rimieri
IGC Proceedings (1977-2023)
A trial was carried out at Pergamino Agricultural Experimental Station to examine the distribution pattern and the profuseness of inflorescence production of white clover (Trifolium repens L.). The treatments were 16 cultivars (Churrinche, El Lucero MAG, Bayucuá, Estanzuela Zapicán, Lucero Plus Inta, Haifa, California, Ladino Gigante Lodigiano, Dubrava, Susi, Merwi, Blanca, Sonja, Espanso, Nora, S 184) of different origins and leaf size. The experimental design was a lattice with four replications. Southamerican cultivars showed a similar distribution pattern and had the highest inflorescence production. They also flowered earlier than foreign cultivars, except Haifa. Some of the cultivars evaluated did …
Breeding Italian Annual Ryegrass For Tolerance To Pythium Ultimum, L. R. Nelson, I. J. Pemberton, G. R. Smith
Breeding Italian Annual Ryegrass For Tolerance To Pythium Ultimum, L. R. Nelson, I. J. Pemberton, G. R. Smith
IGC Proceedings (1977-2023)
This study was conducted in an attempt to improve tolerance of annual ryegrass to Pythium ultimum Trow. Improved tolerance of ryegrass as measured in laboratory experiments was confirmed in greenhouse studies. This tolerance was defined as improved emergence and increased root length of seedlings in the presence of P. ultimum, using rolled germination paper in the laboratory, and sand in the greenhouse. Further experimentation will be required to determine usefulness of this selected trait under field conditions.
Suitable Seed Harvesting Time For Six Grass Species, Hossein Arzani, A. Fakhireh
Suitable Seed Harvesting Time For Six Grass Species, Hossein Arzani, A. Fakhireh
IGC Proceedings (1977-2023)
Determination of the best period of seed harvesting was considered. Six grass species were selected. The research was conducted in three stations of Alborz, Sirachal and Homand Absard. According to maturing stages, seed collection for measuring seed water content (moisture content), weight of 1000 seeds and germination percentage has been done. The result showed that there were significant differences between harvesting time on seed germination for all species in all regions. Moisture content, germination rate, weight of 1000 seeds and seed shedding were important characteristics for determination of suitable seed harvesting time.
Effect Of Nitrogen Fertilizer On Reproductive Tiller Development In Perennial Ryegrass, I. Bahmani, E. R. Thom, C. Matthew, G. Lemaire
Effect Of Nitrogen Fertilizer On Reproductive Tiller Development In Perennial Ryegrass, I. Bahmani, E. R. Thom, C. Matthew, G. Lemaire
IGC Proceedings (1977-2023)
The objective of this study was to compare reproductive tiller development in two ryegrass (Lolium perenne L.) cultivars, when fertilized with nitrogen. Plots of the cultivars ‘Grasslands Ruanui’ and ‘Ellett’ ryegrass were sown in April 1996. Half of each plot received nitrogen fertilizer (30 kg N/ha) after each grazing by dairy cows from September 1996 to May 1997 and from October 1997 to April 1998. Ryegrass tiller dynamics was monitored from September 1996 to March 1998. The proportion of reproductive tillers in the total tiller population was higher, on average, over the first flowering period (October 1996 to January …
Mgrre_Pureoilscouttickets_Shuler - Beem Aka G. A. Beam_1_21127001820000, Mgrre
Mgrre_Pureoilscouttickets_Shuler - Beem Aka G. A. Beam_1_21127001820000, Mgrre
Legacy Scout Tickets from Pure Oil Company
No abstract provided.
Experimental Study On Advanced Real Time Detection System Of Seismic-While-Excavating, Wang Ji, Qin Si, Wu Hai, Zhang Qingqing, Yu Junhui, Su Xiaoyun
Experimental Study On Advanced Real Time Detection System Of Seismic-While-Excavating, Wang Ji, Qin Si, Wu Hai, Zhang Qingqing, Yu Junhui, Su Xiaoyun
Coal Geology & Exploration
Experimental study on advanced real time detection system of seismic-while-excavating
Three-Component Seismic Data Acquisition System Of Coal Mine Based On Mems And Lwip, Wang Huaixiu, Qiu Shuai, Zhu Guowei, Chen Bo
Three-Component Seismic Data Acquisition System Of Coal Mine Based On Mems And Lwip, Wang Huaixiu, Qiu Shuai, Zhu Guowei, Chen Bo
Coal Geology & Exploration
Three-component seismic data acquisition system of coal mine based on MEMS and LwIP
Depth Correction Technique Of Electrical Marker Based On Electrical Field Component Of Csamt, Liu Zuiliang, Zhang Fenxuan, Zhang Jifeng, Zhou Guangyu, Zhao Hui, Zhang Xin
Depth Correction Technique Of Electrical Marker Based On Electrical Field Component Of Csamt, Liu Zuiliang, Zhang Fenxuan, Zhang Jifeng, Zhou Guangyu, Zhao Hui, Zhang Xin
Coal Geology & Exploration
Depth correction technique of electrical marker based on electrical field component of CSAMT
Evaluation On The Resolution Ability Of Underground Transient Electromagnetic Instrument To Disaster-Causing Water Bodies, Zhao Zhongnan, Xu Yangcheng, Wu Yanqing, Tan Qingqing, Kang Yueming, Wang Yao
Evaluation On The Resolution Ability Of Underground Transient Electromagnetic Instrument To Disaster-Causing Water Bodies, Zhao Zhongnan, Xu Yangcheng, Wu Yanqing, Tan Qingqing, Kang Yueming, Wang Yao
Coal Geology & Exploration
Evaluation on the resolution ability of underground transient electromagnetic instrument to disaster-causing water bodies
Technology Of Across-Goaf Drainage Of Coalbed Methane From A Lower Coal Seam Group And Its Primary Application: Taking Sihe Mine Field As An Example, Li Junjun, Li Guofu, Hao Haijin, Hao Chunsheng, Wang Zheng
Technology Of Across-Goaf Drainage Of Coalbed Methane From A Lower Coal Seam Group And Its Primary Application: Taking Sihe Mine Field As An Example, Li Junjun, Li Guofu, Hao Haijin, Hao Chunsheng, Wang Zheng
Coal Geology & Exploration
Technology of across-goaf drainage of coalbed methane from a lower coal seam group and its primary application: Taking Sihe mine field as an example
Sequence Stratigraphy And Coal Accumulation Of Barrier Coastal System Under Epicontinental-Sea Environment: A Case Study Of The Late Paleozoic Taiyuan Formation In Bohai Bay Area, Chang Jia, Chen Shiyue, Wang Qiong, Pu Xiugang, Yang Huaiyu
Sequence Stratigraphy And Coal Accumulation Of Barrier Coastal System Under Epicontinental-Sea Environment: A Case Study Of The Late Paleozoic Taiyuan Formation In Bohai Bay Area, Chang Jia, Chen Shiyue, Wang Qiong, Pu Xiugang, Yang Huaiyu
Coal Geology & Exploration
Sequence stratigraphy and coal accumulation of barrier coastal system under epicontinental-sea environment: A case study of the Late Paleozoic Taiyuan Formation in Bohai Bay Area
Distribution Characteristics Of Heavy Minerals In The Sandstone Of Zhiluo Formation Of Northern Ordos Basin And Its Implication, Zhang Yuanyuan, Zhang Pengfei, Nie Fengjun, Yan Pengbing, Zhang Zhibo, Yan Zhaobin, Zhang Xin
Distribution Characteristics Of Heavy Minerals In The Sandstone Of Zhiluo Formation Of Northern Ordos Basin And Its Implication, Zhang Yuanyuan, Zhang Pengfei, Nie Fengjun, Yan Pengbing, Zhang Zhibo, Yan Zhaobin, Zhang Xin
Coal Geology & Exploration
Distribution characteristics of heavy minerals in the sandstone of Zhiluo Formation of northern Ordos Basin and its implication
Effects Of Different Combined Pretreatments On Biogenic Methane Production By Anaerobic Digestion Of Lignite, Zhang Huaiwen, Yao Yiqing, Xie Changwen
Effects Of Different Combined Pretreatments On Biogenic Methane Production By Anaerobic Digestion Of Lignite, Zhang Huaiwen, Yao Yiqing, Xie Changwen
Coal Geology & Exploration
Effects of different combined pretreatments on biogenic methane production by anaerobic digestion of lignite