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Articles 1171 - 1200 of 58733
Full-Text Articles in Physical Sciences and Mathematics
Table Of Contents, The Editors
Investigation And Comprehensive Utilization Of Resources In Closed Coal Mines In Anhui Province, China, Liu Feiyue, Chen Wanyun, Yang Ke, Duan Minke, Liu Qinjie, Yang Lingyue
Investigation And Comprehensive Utilization Of Resources In Closed Coal Mines In Anhui Province, China, Liu Feiyue, Chen Wanyun, Yang Ke, Duan Minke, Liu Qinjie, Yang Lingyue
Coal Geology & Exploration
[Objevtive] With the continuously intensive exploitation of coal resources and the structural reform of energy supply, many coal mines in Anhui Province have been closed due to resource depletion or backward production capacity. However, the closed coal mines still host resources such as underground spaces, residual coals, gas, mine water, land, and infrastructure equipment. Hence, reutilizing resources in closed coal mines holds significant engineering value and economic benefits. [Methods] Based on the general information and reutilization status of 59 coal mines in Anhui Province that have been closed since 2013, this study analyzed the distribution characteristics, residual resources, and reutilization …
Factors Influencing The Productivity And Technology Optimization Of Horizontal Wells For Moderately Deep Coalbed Methane In The Northern Zhengzhuang Block, Zhang Cong, Li Kexin, Jia Huimin, Zhang Wuchang, Yang Ruiqiang, Li Jun, Wang Qi, Hou Weiming
Factors Influencing The Productivity And Technology Optimization Of Horizontal Wells For Moderately Deep Coalbed Methane In The Northern Zhengzhuang Block, Zhang Cong, Li Kexin, Jia Huimin, Zhang Wuchang, Yang Ruiqiang, Li Jun, Wang Qi, Hou Weiming
Coal Geology & Exploration
[Objective] Hydraulic fracturing of vertical wells was adopted during the early production of moderately deep coalbed methane (CBM) of the northern Zhengzhuang block in the Qinshui Basin, generally yielding low productivity and inefficiency. In contrast, single-casing fracturing of horizontal wells has increased the single-well production to 10‒50 times that of vertical wells, establishing horizontal wells as the dominant development well type. However, the horizontal wells differ greatly in CBM production. This study aims to determine the factors influencing the productivity of horizontal wells using staged fracturing for moderately deep CBM in the northern Zhengzhuang block and improve the production performance. …
Characteristics Of The Pore And Seepage System Of Deep Coalbed Methane In The Baijiahai Uplift, Junggar Basin, Xinjiang, Chen Heqing, Yang Zhaobiao, Li Daoqing, Xu Miaomiao, Liang Yuhui, Liu Changqing, Wang Yuqiang
Characteristics Of The Pore And Seepage System Of Deep Coalbed Methane In The Baijiahai Uplift, Junggar Basin, Xinjiang, Chen Heqing, Yang Zhaobiao, Li Daoqing, Xu Miaomiao, Liang Yuhui, Liu Changqing, Wang Yuqiang
Coal Geology & Exploration
[Objective] Xinjiang boasts abundant deep coalbed methane (CBM) resources, with Jurassic coal seams in the Baijiahai uplift of the Junggar Basin identified as a favorable target area for deep CBM exploration and exploitation. The pore and seepage system of deep CBM directly determines its recoverability. [Methods] Based on appraisal well Caimei 2-004H drilled the most recently in the Xinjiang oilfield in 2023, this study investigated in detail the pore and seepage system of coals in the Jurassic Xishanyao Formation in the Baijiahai uplift using scanning electron microscopy (SEM) observations, mercury injection capillary pressure (MICP), low-temperature liquid nitrogen adsorption, and carbon …
Physical Simulation Experiments On Mining-Induced Water Inrushes From Coal Seam Floors: Advances In Research And Prospects, Zhang Pingsong, Ou Yuanchao
Physical Simulation Experiments On Mining-Induced Water Inrushes From Coal Seam Floors: Advances In Research And Prospects, Zhang Pingsong, Ou Yuanchao
Coal Geology & Exploration
[Objective] Water inrushes from floors are subjected to the superimposed effects of factors such as specific geological structures, water-rock-stress coupling, and mining disturbance, proving complex, concealed, and abrupt. [Methods] Physical simulation experiments can effectively reproduce the environments of the floors and confined water, intuitively present the whole process of both mining-induced fracture propagation in the floors and the path evolution of water inrushes, and obtain multi-source data of all disaster stages in a real time manner. Therefore, such experiments enjoy unique advantages in investigating water inrushes from floors. [Results and Conclusions] This study reviews the research achievements in water inrushes …
Impacts Of Observation Line Layout Morphology And Survey Point Missing On The Inversion Of Predicted Parameters Of Mining Subsidence, Guo Qingbiao, Yu Qing, Zheng Meinan, Luo Jin
Impacts Of Observation Line Layout Morphology And Survey Point Missing On The Inversion Of Predicted Parameters Of Mining Subsidence, Guo Qingbiao, Yu Qing, Zheng Meinan, Luo Jin
Coal Geology & Exploration
[Objective] Accurate prediction parameters for mining subsidence are important basis for full cycle green coal mining, while inversion based on the subsidence data of observation lines serves as the main method to obtain these parameters. [Methods] To quantitatively analyze the impacts of the observation line layout morphology and survey point missing on the inversion of prediction parameters for mining subsidence, this study developed a probability integral model-based inversion method for these parameters using the chimpanzee optimization algorithm (ChOA). Using this method combined with digital simulation experiments, this study predicted subsidence parameters under six observation line morphologies and survey point missing …
Fracturing Evolutionary Law And Energy Utilization Efficiency Of Green Sandstones Under Different Loading Rates, Zhao Huanshuai, Pan Yongtai, Qiao Xin, Wang Xingyu, Yu Chao, Huang Jiacheng
Fracturing Evolutionary Law And Energy Utilization Efficiency Of Green Sandstones Under Different Loading Rates, Zhao Huanshuai, Pan Yongtai, Qiao Xin, Wang Xingyu, Yu Chao, Huang Jiacheng
Coal Geology & Exploration
[Objective] This study aims to explore the fracturing evolutionary laws and energy utilization efficiency of rocks under different loading rates is a pressing issue in the field of rock fragmentation and processing. [Methods] To this end, the microscopic parameters of green sandstones were calibrated based on laboratory tests, followed by the identification of relationships between the macro- and microscopic mechanical responses of the sandstones. Using Particle Flow Code (PFC), this study investigated the stress-strain curves and stress chain distribution of green sandstones under different loading rates. Then, based on the fracturing and crack characteristics, this study analyzed the fracturing evolutionary …
Remote Sensing Monitoring And Spatiotemporal Characteristics Of Co2 And Ch4 Concentrations In Coal-Electricity Production Bases, Xu Yanfei, Chen Yongchun, Li Jing, Liu Xiaozhou, Miao Wei, Zhao Derong, Rui Chengqi
Remote Sensing Monitoring And Spatiotemporal Characteristics Of Co2 And Ch4 Concentrations In Coal-Electricity Production Bases, Xu Yanfei, Chen Yongchun, Li Jing, Liu Xiaozhou, Miao Wei, Zhao Derong, Rui Chengqi
Coal Geology & Exploration
[Objective] CO2 and CH4 are identified as the primary greenhouse gases emitted from energy production in coal-electricity production bases. Mointoring these emissions and analyzing their spatiotemporal distribution are essential components of building a carbon monitoring system in the study area. [Methods] This study investigated Huainan City, Anhui Province as an example to explore the spatiotemporal characteristics of CO2 and CH4 in coal-electricity production bases. Specifically, this study examined the CO2 and CH4 concentrations in the study area based on data from the GOSAT，OCO-2, and Sentinel-5P satellites，determining the column concentration changes and distribution of CO …
Hydrochemical Characteristics And Genetic Mechanism Of Geothermal Water In The Wandong Geothermal Area Along The Moxi Fault In Western Sichuan, Huang Xun, Zhang Yunhui, Li Xiao, Lyu Guosen, Guo Hongyang
Hydrochemical Characteristics And Genetic Mechanism Of Geothermal Water In The Wandong Geothermal Area Along The Moxi Fault In Western Sichuan, Huang Xun, Zhang Yunhui, Li Xiao, Lyu Guosen, Guo Hongyang
Coal Geology & Exploration
[Objective] Geothermal energy exploitation is identified as a vital way to achieve the goals of peak carbon dioxide emissions and carbon neutrality. The Moxi fault, located in the southern segment of the Xianshuihe fault zone in western Sichuan, boasts abundant geothermal resources, serving as a significant area for subsequent geothermal energy exploitation. [Methods] This study investigated the hydrogeochemistry of the Wandong geothermal area along the Moxi fault, analyzed the water-rock interaction process in the area based on the hydrochemical correlation, and calculated the reservoir temperatures and the mixing ratios of cold and hot water using geothermometers and the silica-enthalpy mixing …
Experimental Study On The Mechanics And Deformation Failure Characteristics Of Multi-Source Coal-Based Solid Waste Cemented Backfill, Yang Ke, Zhang Jiqiang, He Xiang, Wei Zhen, Zhao Xinyuan
Experimental Study On The Mechanics And Deformation Failure Characteristics Of Multi-Source Coal-Based Solid Waste Cemented Backfill, Yang Ke, Zhang Jiqiang, He Xiang, Wei Zhen, Zhao Xinyuan
Coal Geology & Exploration
[Objective] In order to study the mechanical properties and deformation failure laws of multi-source coal-based solid waste cemented backfill (CBSWCB), the uniaxial compression, acoustic emission response and microstructure test experiments were carried out with 5 types of typical coal-based waste. [Methods] The factors influencing the uniaxial compressive strength of CBSWCB, as well as their interaction, were analyzed, and a four-dimensional spatial visualization model of the factors influencing the compressive strength based on their interactions was established. Besides, the mechanical evolution characteristics and macroscopic deformation failure laws under uniaxial compression conditions were elaborated by referring to the acoustic emission and microstructure …
Application Of Microseismic Monitoring System For Coal Mines To The Prevention And Control Of Water Disasters On Working Face Roofs, Fan Xin, Cheng Jianyuan, Li Sheng, Duan Jianhua, Fan Tao, Li Bofan, Wang Yanbo
Application Of Microseismic Monitoring System For Coal Mines To The Prevention And Control Of Water Disasters On Working Face Roofs, Fan Xin, Cheng Jianyuan, Li Sheng, Duan Jianhua, Fan Tao, Li Bofan, Wang Yanbo
Coal Geology & Exploration
[Objective] Increasing coal mining depth in coal mines has caused increasingly prominent risks of water disasters on working face roofs, which restrict the green, safe, and efficient coal mining in China’s coal mines. Therefore, there is an urgent need for new technologies for the monitoring and early warning of these water disasters. [Methods] This study explored the application of the joint well-ground microseismic monitoring system to the prevention and control of water disasters on working face roofs, achieving transparent, intelligent monitoring and early warning of water disaster risks. In this system, microseismic sensor arrays are arranged on the surface above …
Geological Structures Fine Monitoring Using Seismic-While-Tunneling Technique In Wangpo Mine, Zhao Huibo, Qin Si, Chen Chao, Guan Qi, Zhao Xingwei, Che Jianhang
Geological Structures Fine Monitoring Using Seismic-While-Tunneling Technique In Wangpo Mine, Zhao Huibo, Qin Si, Chen Chao, Guan Qi, Zhao Xingwei, Che Jianhang
Coal Geology & Exploration
Traditional tunnel seismic advance detection technology is limited by the use of explosives, the need for mining stoppages, prediction speed, detection range, and capabilities, making it challenging to meet the high-precision geological structure detection requirements of intelligent tunneling faces. In response, the seismic-while-tunneling technique utilizes the vibration of the roadheader cutting the coal wall as the seismic source. This method employs real-time data upload, automatic processing, and dynamic imaging. By leveraging information technology and software support, and utilizing real-time continuous super-saturation stacking supported by massive data, the imaging precision of geological anomalies ahead of the mining face is significantly enhanced. …
A High-Resolution Method For Processing Coal Measures Seismic Data Based On Anisotropic Medium Theories And Its Application, Li Huiting, Chang Suoliang, Zhang Sheng, Guan Wenyuan, Zhao Xing, Wang Weiqian, Tantai Mingjun, Gao Kaixin
A High-Resolution Method For Processing Coal Measures Seismic Data Based On Anisotropic Medium Theories And Its Application, Li Huiting, Chang Suoliang, Zhang Sheng, Guan Wenyuan, Zhao Xing, Wang Weiqian, Tantai Mingjun, Gao Kaixin
Coal Geology & Exploration
[Objective] The increasing importance of the exploration and exploitation of deep resources poses new requirements for high-precision seismic exploration. Given that conventional isotropy-based data processing methods are no longer applicable to the coal-bearing strata with strong anisotropy. [Methods] This study proposed a method for processing seismic data based on theories of both transverse isotropy medium with a vertical symmetry axis (VTI) media and transverse isotropy with a horizontal axis of symmetry (HTI) media. First, to characterize the depositional characteristics of coal-bearing strata, this study analyzed the features of VTI media, revealing that high-order dynamic correction can effectively eliminate anisotropy-induced event …
Pneumatic Directional Drilling Technology And Equipment For Broken-Soft Coal Seams In Underground Coal Mines, Tian Hongliang, Zhang Jinbao, Wang Li, Fang Jun, Wang Jianqiang
Pneumatic Directional Drilling Technology And Equipment For Broken-Soft Coal Seams In Underground Coal Mines, Tian Hongliang, Zhang Jinbao, Wang Li, Fang Jun, Wang Jianqiang
Coal Geology & Exploration
[Objective] The geological conditions of coal seams in China are complex, with a wide distribution of broken-soft coal seams, and a large number of wells have the problems of high gas and coal-gas outburst. Currently, borehole gas drainage is an effective measure for preventing and controlling the gas disasters. [Methods] In response to the problems of uncontrollable drilling trajectory, shallow drilling depth, large blind spots of drainage in conventional rotary drilling process of broken-soft coal seams, as well as multiple stuck drilling accidents, great difficulty in drilling and low drilling efficiency in conventional directional drilling processes, the development history and …
Build-Up Rate Prediction Of Rotary Steerable Tools Based On Delay Differentiation, Li Fei, Zhang Nan
Build-Up Rate Prediction Of Rotary Steerable Tools Based On Delay Differentiation, Li Fei, Zhang Nan
Coal Geology & Exploration
[Objective] Accurate build-up rate prediction of rotary steerable tools is a prerequisite to achieve the precise control of tools. In order to grasp the variation law of the build-up rate of the rotary steerable bottom-hole assembly (RSBHA). [Methods] Based on the structural charaeteristics of the tool, the Euler-Bernoulli beam equation method is used to analyz the forces outing on the composite RSBHA. At the same time, the calculation method of the tool deflection angle in different sections and the bit pre-drilling deflection angle was obtained with consideration to the geometric relationship of the bottom-hole assembly, and the distance between the …
Analysis Of Three-Dimensional Nonlinear Fluid-Solid Coupling Vibration Characteristics Of Coalbed Methane Abandoned Well Plugging String, Xu Zhixin, Wan Jifang, Hong Yi, Liu Hangming, Yi Xianzhong, Diao Binbin, Wang Yanbin
Analysis Of Three-Dimensional Nonlinear Fluid-Solid Coupling Vibration Characteristics Of Coalbed Methane Abandoned Well Plugging String, Xu Zhixin, Wan Jifang, Hong Yi, Liu Hangming, Yi Xianzhong, Diao Binbin, Wang Yanbin
Coal Geology & Exploration
[Objective] The plugging quality of cement plug in abandoned coalbed methane wells is critical to preventing pollutant leakage. Current standards for handling these wells involve simple mud pump injection, which often results in cement plugs with issues like particle agglomeration, bubbles, and micropores. These defects reduce the strength of the cement plug and compromise its sealing performance. [Methods] To address this, vibration technology is applied to the plugging operation, using a specialized tool to induce vibrations in the pipe string. This process enhances the fluidity of the cement slurry via the transmission of vibration energy, thereby improving the plugging quality …
Forage Productivity Evaluation And Geographic Information Systems In Temperate Semi-Arid Agro-Ecosystem, H Salinas, R Ramirez, J Zegbe, G Medina, R A. Martinez
Forage Productivity Evaluation And Geographic Information Systems In Temperate Semi-Arid Agro-Ecosystem, H Salinas, R Ramirez, J Zegbe, G Medina, R A. Martinez
IGC Proceedings (1993-2023)
700,000 ha of the temperate semi-arid area of Zacatecas state are grown with rainfed crops. Low productivity is obtained from these crops: 350 kg/ha of beans grain and 500 kg/ha of corn grain. This state is characterized by a wide range of topographic and climatic values. A need for alternative crops led to establishment of a trial to evaluate rainfed forages, and to know in what range these could be located. Geographic information systems were used to find out the potential area of the species. Results indicated that sorghum presented a higher yield (5822 kgDM/ha) than sorghum x sudan (5460), …
The Effect Of Harvest Techniques On Yield, Botanical Composition And Soil Structure In An Organic Clover Grass Sward, M Lund
IGC Proceedings (1993-2023)
The objectives of this study were to find out if lighter machines with less number of wheel-passes are favourable for harvesting grassland under wet conditions. A field trial on an ecological experimental farm in Norway was performed with two different mechanization systems. One was a conventional mechanization system with reduced ground pressure tractor driving a forage harvester and grass trailers, and one less wheeling system with reduced ground pressure where a two-wheel tractor with a mower was putting the grass in a swath and a self loading trailer was picking the swath up. The field work was carried out as …
Symbiotic Potential And N Returns In Forage And Grain Legumes For Improving The N Economy Of Tropical Cropping Systems, F D. Dakora, J A. Abdogoba
Symbiotic Potential And N Returns In Forage And Grain Legumes For Improving The N Economy Of Tropical Cropping Systems, F D. Dakora, J A. Abdogoba
IGC Proceedings (1993-2023)
There were marked cultivar and species differences in the amounts of N fixed and potential N returns in five forage legumes and ten groundnut (Arachis hypogaea L.) cultivars evaluated for symbiotic performance in both Guinea and Sahel savanna environments. Of the forage legumes, the Crotalaria and Lablab species accumulated greater symbiotic N and therefore showed higher potential N returns for improving the N economy of soils in both Guinea and Sahel savanna in Africa. However, Lablab appeared to be better adapted to the drier Sahel environment compared to the other species. When nutrient imbalances in the Guinea savanna soil …
Integration Of Forage Legumes Into Maize/Elephant Grass Systems For Dairy Farming, E N. Sabiiti, J S. Mugerwa, P Ngategize, G Kyeyune
Integration Of Forage Legumes Into Maize/Elephant Grass Systems For Dairy Farming, E N. Sabiiti, J S. Mugerwa, P Ngategize, G Kyeyune
IGC Proceedings (1993-2023)
The livestock sector contributes about 30% of the total value of agricultural production but the sector does not meet the demand for milk. Currently, there is serious migration of the rural population to urban centres and this will lead to high demand for milk and milk products. Therefore, the development of peri-urban dairy production by the small scale farmers appears a promising option to solve the problems of malnutrition, increase household incomes and improve the quality of life of these farmers. The dominant production system practised is zero-grazing using improved dairy breeds and feeding elephant grass (Pennisetum purpureum) …
Compatibility Of Stylosanthes Hamata And Stylosanthes Capitata In Mixed Pastures In The Subhumid Zone Of Nigeria, G Tarawali, M Peters
Compatibility Of Stylosanthes Hamata And Stylosanthes Capitata In Mixed Pastures In The Subhumid Zone Of Nigeria, G Tarawali, M Peters
IGC Proceedings (1993-2023)
The forage productivity of sole plots of Stylosanthes capitata and Stylosanthes hamata in comparison with various proportional mixtures of the two legumes and their effect on soil properties and subsequent maize yield were studied in subhumid Nigeria. Dry matter (DM) yields in the mixtures were higher than in the sole stands, with the mixtures of S. hamata and S. capitata reaching 11959 to 14822 kg/ha over a three year period. Total nitrogen and/or organic carbon concentrations in the soil following the three years of legume were higher in the mixtures than in the sole stands, and this resulted in higher …
Corn Silage In Sustainable And Conventional Systems For Finishing Beef Cattle, J P. Fontenot, V G. Allen, L L. Scott, D H. Vaughan, C A. Laub, D B. Taylor
Corn Silage In Sustainable And Conventional Systems For Finishing Beef Cattle, J P. Fontenot, V G. Allen, L L. Scott, D H. Vaughan, C A. Laub, D B. Taylor
IGC Proceedings (1993-2023)
The objective of the research was to compare finishing beef steers on high corn (Zea mays L.) silage diets in which the corn was produced under conventional and sustainable systems. The conventional corn forage was produced on a given area for 5 yr, using conventional practices, alternating with 5 yr of alfalfa (Medicago sativa L.) The sustainable system corn forage was produced in a 4-yr rotation with small grain cover crops and legumes, in which corn was grown in a given area once every 4 yr. Input of pesticides was less for the sustainable system. Steers were fed …
Hardseededness Under Field Conditions Of Medicago Polymorpha During Five Softening Seasons In The Mediterranean Zone Of Chile, J Avendano, A Del Pozo, C Ovalle
Hardseededness Under Field Conditions Of Medicago Polymorpha During Five Softening Seasons In The Mediterranean Zone Of Chile, J Avendano, A Del Pozo, C Ovalle
IGC Proceedings (1993-2023)
The long term seed softening of burr medic (Medicago polymorpha L.) was studied in the field in a mediterranean environment in Chile. Burrs were collected in March of 1988, 1989, 1990 and 1991 (collecting years), and placed in the field either on the surface or buried at 1 cm depth. Field germination was recorded regularly and the remaining non-germinated seeds were tested for germination in the laboratory during 4 years. The percentage of soft seeds on soil surface burrs was on average 3.2% (mean of 4 collecting years) after the first summer in the field, and reached 83% after …
Forage Production In The Rice Fields During Dry Season Ryegrass, White Clover And Oats, A S. Raveloson, E Haraldseide
Forage Production In The Rice Fields During Dry Season Ryegrass, White Clover And Oats, A S. Raveloson, E Haraldseide
IGC Proceedings (1993-2023)
In the highland of Madagascar, lack of good forage is very acute during the dry and cool season. The cultivation of temperate forage in rice fields under irrigation is practised by farmers to feed dairycattle. The main forages which are cultivated are oats (Avena sativa), Italian rye grass (Lolium multiflorum) and white clover (. Under experimental conditions rye grass has given the highest yield, but every species have their particularities, which can be useful in forage production. Three varieties of each species were studied in 1993 and 1994. Experiments were carried at five sites in the winter …
Annual Legumes For Cropping Systems Of The North Central Usa, O B. Hesterman, A Shrestha, J W. Fisk, J M. Squire, P Jeranyama, C C. Sheaffer
Annual Legumes For Cropping Systems Of The North Central Usa, O B. Hesterman, A Shrestha, J W. Fisk, J M. Squire, P Jeranyama, C C. Sheaffer
IGC Proceedings (1993-2023)
On-farm and on-station research on the use of annual legumes in cropping systems was initiated in 1992 in Michigan. Research included studies on nitrogen dynamics, weed suppression ability, forage potential, utility as a cover crop, and optimum planting dates of barrel medic (Medicago truncatula Gaertn. cv. Mogul), burr medic (M. polymorpha L. cv. Santiago), snail medic (M. scutellata L. cv. Sava), and berseem clover (Trifolium alexandrinum L.). Nitrogen fertilizer replacement values (FRV) up to 76 kg ha-1 were obtained where either corn or canola followed annual legumes in rotation. The optimum seeding time of medics in …
Arachis Pintoi: A Multipurpose Legume For Sustainable Land Use, P J. Argel, P C. Kerridge, E A. Pizarro
Arachis Pintoi: A Multipurpose Legume For Sustainable Land Use, P J. Argel, P C. Kerridge, E A. Pizarro
IGC Proceedings (1993-2023)
Perennial peanut (A. pintoi) is a multiple-use tropical legume that can be used in association with a grass or as a cover crop in tree plantations. As a forage plant it has high forage quality and persistence under heavy grazing. As a cover crop and for erosion control it forms a dense cover under shade, excludes weeds and contributes to soil improvement.
Impacts Of Grazed Pastures On Soil Water And Nitrogen Status In Cropping Systems, J A. Baldlock, W D. Bellotti, A D. Moore, I Yunusa
Impacts Of Grazed Pastures On Soil Water And Nitrogen Status In Cropping Systems, J A. Baldlock, W D. Bellotti, A D. Moore, I Yunusa
IGC Proceedings (1993-2023)
In southern Australia pastures precede wheat in many rotations. In recent years the quality (legume content) of many pastures has declined and the value of pastures in rotation with cereals has been questioned. This research aims to develop a more complete understanding of the impact of pastures on crop production through greater knowledge of the below ground processes of soil water and soil inorganic nitrogen. In this study, the impacts of annual barley grass (Hordium leporinum) and barrel medic (Medicago truncatula) pastures on soil water and inorganic nitrogen status at the start of a subsequent wheat growing season were investigated …
Rhizoma Peanut Based Cropping Systems For Dairy Effluent Spray Fields, E C. French, K R. Woodard, D A. Graetz, G M. Prine, H H. Van Horn
Rhizoma Peanut Based Cropping Systems For Dairy Effluent Spray Fields, E C. French, K R. Woodard, D A. Graetz, G M. Prine, H H. Van Horn
IGC Proceedings (1993-2023)
Cropping schemes that efficiently utilize nutrients applied in dairy waste effluent sprayfields is needed to avoid ground water contamination. Three 12 month cropping systems were grown under dairy waste effluent irrigation: 1) corn-forage sorghum-rye (C-FSR), 2) corn-rhizoma peanut-rye (C-RP-R), and 3) rhizoma peanutrye (RP-R). With an effluent N loading rate of 403 kg ha-1 yr-1, 2-yr mean DM yield was 30.7 Mg ha-1 yr-1 for the C-FS-R system, 26.2 for C-RP-R, and 17.9 for RP-R. Nitrogen concentration for C and FS ranged from 9 to 14 g kg-1 while RP ranged from 24 to 35. The higher N concentration in …
A Model To Determine The Optimum Forage Combination And Level Of Concentrate For Dairy Cows, E Jahn, G Gutierrez, R Velasco, M Silva
A Model To Determine The Optimum Forage Combination And Level Of Concentrate For Dairy Cows, E Jahn, G Gutierrez, R Velasco, M Silva
IGC Proceedings (1993-2023)
A model was developed to simulate a milk production system. The program determines the milk production based on energy nutrition, calving date, cow potential and defines grazing sequence and harvesting dates. It can simulate different stocking rates, paddock sizes, levels of production according to pasture quality, seasonal production and concentrate intake. The output of the model is used for an economical analysis which evaluates costs and returns; for some of the most sensitives factors that affect economic returns like prices of milk and concentrate, pasture production and others. The program makes an analysis of sensitivity where these factors are varied …
Yield Decrease Of Corn Sown Into Italian Ryegrass By Minimum Tillage, R Kobayaski, K Tateno, S Sato
Yield Decrease Of Corn Sown Into Italian Ryegrass By Minimum Tillage, R Kobayaski, K Tateno, S Sato
IGC Proceedings (1993-2023)
The objective of this study was to determine the factor causing yield decrease of corn (Zea mays L.) sown into Italian ryegrass (Lolium multiflorum Lam.) by minimum tillage. 5 plots with 2 replications were made, consisting of the number of harvest times of Italian ryegrass, tillage system, and herbicide application. They were 1CT (Italian ryegrass was harvested once/conventional tillage), 1MT (once/minimum tillage), 1MTH (once/MT/herbicide), 2CT (twice/ CT), and 2MT (twice/MT). 1MT produced lowest corn yield and highest Italian ryegrass litter. This observation suggested that corn yield decrease was attributed to competition with Italian ryegrass regrowth. NAR in 1MT …