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Articles 61 - 90 of 7342
Full-Text Articles in Life Sciences
The Punctuated Arena Model- A New Approach To Tackling Technology Transfer Failure, N D. Macleod, A D. Shulman
The Punctuated Arena Model- A New Approach To Tackling Technology Transfer Failure, N D. Macleod, A D. Shulman
IGC Proceedings (1997-2023)
Valuation of the worth of research and development activities is increasingly shifting from outputs to outcomes. The technology transfer record of agricultural R&D focused on pastures and resource management remains generally poor. Participatory R&D approaches have been developed and promoted to overcome this, but these also have performance problems. Based on the authors’ experience with R&D and communication management a Punctuated Arena Model has been developed which is argued to offer scope for improving technology transfer outcomes.
Agri-21: Sustainable Farming Demonstration, M Rasnake, W R. Burris, G D. Lacefield
Agri-21: Sustainable Farming Demonstration, M Rasnake, W R. Burris, G D. Lacefield
IGC Proceedings (1997-2023)
On-farm demonstrations were established in 1993 to demonstrate the technology required to conduct a profitable and sustainable farming operation into the 21st Century. These were part of a cooperative program between the Tennessee Valley Authority (TVA) and Land Grant Universities in the seven states of the TVA region. Four demonstrations were established in Kentucky. A beef farm in west Kentucky will be used to illustrate the project. This farm improved crop and livestock management, record keeping and environmental stewardship. Their goal is to increase farm profitability while improving the soil and water resources.
Extension Agronomist Perceptions Regarding Clover Use In The Usa, D M. Ball, G D. Lacefield
Extension Agronomist Perceptions Regarding Clover Use In The Usa, D M. Ball, G D. Lacefield
IGC Proceedings (1997-2023)
Recent enhancement of economic incentives for using legumes in forage/livestock systems seems likely to result in greater usage of clovers in the USA. To determine attitudes regarding clovers, a questionnaire was sent to forage crop agronomists having Extension assignments. Responses to most questions varied greatly, particularly among geographic regions. Poor grazing management was identified as the primary concern or problem associated with clovers, followed by poor persistence, and a lack of recognition of the benefits. Improved forage quality was ranked as the most important benefit, followed by better distribution of pasture growth, and biological nitrogen fixation. The importance of benefits …
Roles Of Clovers In Southeast U.S.A Pastures, G D. Lacefield, D M. Ball, J C. Henning, M Rasnake
Roles Of Clovers In Southeast U.S.A Pastures, G D. Lacefield, D M. Ball, J C. Henning, M Rasnake
IGC Proceedings (1997-2023)
Grasses dominate pastures in the Southeast U.S.A.; research and farmer experience have shown that the addition of legumes to grass dominant pastures can improve environmental, agronomic and animal parameters. Legumes grown in mixtures with grasses can increase yield, improve forage quality and animal performance, convert atmospheric nitrogen into a form useable by plants, extend the grazing season, and offset certain animal disorders. As livestock producers continue to strive for more sustainable feed production and utilization programs with greater emphasis on grazing, legumes will play an even greater role in Southeast U.S.A. agriculture.
Sustainable Grazing Systems- A Program To Develop And Deliver Improved Temperate Pastures In Australia, W K. Mason, G Kay, G Lodge
Sustainable Grazing Systems- A Program To Develop And Deliver Improved Temperate Pastures In Australia, W K. Mason, G Kay, G Lodge
IGC Proceedings (1997-2023)
The Sustainable Grazing Systems Program aims to combine the efforts of producers, researchers and extension agents into a focused partnership to develop, manage and implement grazing systems that are more profitable and more sustainable. Rather than the traditional approach of undertaking the research and then developing extension packages for livestock producers, this Program has set up a network with producers, researchers and extension agents to collectively develop and test improved systems. The process is described as colearning. Compared with more traditional approaches, producer input is greatly increased as the role of researchers and extension agents is modified, but not decreased. …
A New Degree For Land Based Industries At Massey University, New Zealand, J Hodgson, R D. Anderson, J H. Kirkman
A New Degree For Land Based Industries At Massey University, New Zealand, J Hodgson, R D. Anderson, J H. Kirkman
IGC Proceedings (1997-2023)
A brief description is given of the background, structure and management of a new Bachelor of Applied Science degree introduced at Massey University in 1994 to meet the changing needs of the primary sector industries. Examples are given of the flexibility of choice offered to students enrolling in the programme, with particular reference to opportunities in plant and pastoral science. Enrollment statistics for the first two years of the programme are discussed.
The Evolving International Grassland Congress, L R. Humphreys
The Evolving International Grassland Congress, L R. Humphreys
IGC Proceedings (1997-2023)
The locations of the International Grassland Congresses are listed. Analysis of the disciplinary themes of papers presented at five Congresses from 1937 to 1993 indicated a considerable homeostasis of content. The plant genetic base for grassland improvement received most attention, and this, together with plant physiology, plant ecology and soil science contributed 52 to 57 per cent of the subject matter at all five Congresses. Emergent topics are mentioned.
Land Evaluation For Sustainable Land Use By Remote Sensing And Gis Case Study: Assessment Of Soil Erosion In Pakistan, Y Yamamoto, S Uchida, T Suyama, A Shoji
Land Evaluation For Sustainable Land Use By Remote Sensing And Gis Case Study: Assessment Of Soil Erosion In Pakistan, Y Yamamoto, S Uchida, T Suyama, A Shoji
IGC Proceedings (1997-2023)
In the northern part of Punjab in Pakistan, severe soil erosion has caused land degradation and has disturbed sustainable land use systems. Since much of this erosion has been marked near rivers, watersheds and topography are considered to be related to soil erosion. We applied the Geographic Information System (GIS) and Remote Sensing to the assessment of an erodible area. GIS is very useful for conducting spatial data analysis using map data. Remotely sensed data provides the information about land surfaces. In this study, the distance from the river, weighted by the slope estimated by GIS, and the standard deviations …
Strategies For Forage Research And Transfer In India, R P. Singh, Bhag Mal
Strategies For Forage Research And Transfer In India, R P. Singh, Bhag Mal
IGC Proceedings (1997-2023)
The debate on how to meet the yawning gap of forage and feed (both in terms of quantity and quality) in India has continued since the last decade. This paper is an effort to discuss the feed and forage deficit, harnessing of unexploited resources (arable and non-arable) and the strategies of forage research and extension support for the development of forage and feed sector.
Forage Information System On The World Wide Web, D B. Hannaway, S Griffith, P Hoagland, M Runyon, R Fisher
Forage Information System On The World Wide Web, D B. Hannaway, S Griffith, P Hoagland, M Runyon, R Fisher
IGC Proceedings (1997-2023)
The Forage Information System on the World Wide Web (FIS WWW) is a global forage information resource envisioned to become a comprehensive information system for all aspects of forages. WWW technologies provide an opportunity to link people and information in a work-sharing and access-on-demand environment via interlinking of computers. The FIS is a collection of Internet-based forage information linked and accessible via WWW access software programs (browsers), like NetscapeR. Browsers provide a unified interface for information on the Internet. They make it possible to access formatted text, color pictures, sound, and video. The “superstructure” for FIS WWW is being developed …
An Investigation On Inventory Of Sub-Steppic Meadows In Northwestern Iran, Mansour Mesdaghi
An Investigation On Inventory Of Sub-Steppic Meadows In Northwestern Iran, Mansour Mesdaghi
IGC Proceedings (1997-2023)
The meadows of the Ardabill region with an area of 77,000 hectares, make up about 50% of the total areas scattered in central and western parts of Ardabill. The objectives of this research were to identify and classify the meadows based on vegetation. It was observed that among eight representative stands, Vagah-sara and Samian were more diverse compared to the other stands. The richness increases as soil moisture increases. From the standpoint of life form, hemicryptophytes and therophytes dominated. Productions of dry matter were 3900 and 3700 kg/ha at Arjestan and Khatampboulaghi respectively, and were decreased to 1500 kg/ha at …
Preliminary Evaluation Of Introduced And Local Lines Of Pearl Millet Under North Sinai Conditions, A H. Belal, A A. Younis
Preliminary Evaluation Of Introduced And Local Lines Of Pearl Millet Under North Sinai Conditions, A H. Belal, A A. Younis
IGC Proceedings (1997-2023)
Field trials were conducted during 1994 and 1995 seasons on calcareous soil to evaluate thirty introduced and local lines of forage pearl millet (Pennisetum americanum). The evaluation included growth characteristics, forage yield, chemical composition and ion content. Present results of both seasons indicate that the thirty lines varied significantly in their growth, forage yield, chemical composition and ion content, organic and inorganic. The top productivity of dry yield and its components was from the ICMP- 155, while the lowest was from an introduced line from Ghana. Also, the line ICMP-155 gave the highest values of C.P., P+++, K+, …
The Rangeland Type And Its Geographical Distribution In Tibet, Cui Heng-Xin, Weinahan Heng-Xin
The Rangeland Type And Its Geographical Distribution In Tibet, Cui Heng-Xin, Weinahan Heng-Xin
IGC Proceedings (1997-2023)
The area of Tibet is a major component of the Qing-Zang Plateau. The natural conditions are complex with various environmental types. The range of the area is of various types. Almost all the range types found in China are presented here. It is characterized by the geographical distribution on horizontal belts in plateau with vertical differences. Therefore it represents the characteristics of the combination of horizontal and vertical changes.
Changes In The Distribution Of Carbohydrates Due To Water Stress And Root-Shoot Ratio As An Index Of Drought Resistance In Ecotypes Of Adesmia Bicolor (Poir.) D.C., B G. Neves-Piestun, Armando Olano, Dan Piestun
Changes In The Distribution Of Carbohydrates Due To Water Stress And Root-Shoot Ratio As An Index Of Drought Resistance In Ecotypes Of Adesmia Bicolor (Poir.) D.C., B G. Neves-Piestun, Armando Olano, Dan Piestun
IGC Proceedings (1997-2023)
The genera Adesmia, is found in the “El Plata” area. Adesmia bicolor (Poir). D.C. is one of the most common species in Uruguay that belongs to this genera. In this study, three ecotypes were collected from different kinds of environments. Ecotypes 016, 2316 and 7017, came from superficial-soil, clay-soil and sandy soil, respectively. The ecotypes of Adesmia bicolor (Poir.) DC. were studied under water-stress conditions (two levels), during two stages: vegetative phase and beginning of blossom. In both stages, leaf-water potential (LWP), leaf-relative-water content (LRWC), leaf-dry matter (LDM), stem-dry matter (SDM) and root-dry matter (RDM) were measured, while root-shoot ratio …
A Study Of Reasons For The Endangered Status Of Potaninia Mongolica In Arid Desert Grasslands Of China, Wang Jihe, Peng Hongjia, Shi Qian, Zhang Dongming
A Study Of Reasons For The Endangered Status Of Potaninia Mongolica In Arid Desert Grasslands Of China, Wang Jihe, Peng Hongjia, Shi Qian, Zhang Dongming
IGC Proceedings (1997-2023)
Potaninia mongolica is an endangered plant species of arid desert grasslands of China. Reasons for its decline and opportunities for its conservation were investigated by studying the plant’s distribution, biological characteristics, plant community associations and stress resistance.
A Comparison Of Steer Gains On Cunningham Leucaena And Some Alternative Psyllid-Tolerant Shrub Legumes, R J. Jones, B Palmer
A Comparison Of Steer Gains On Cunningham Leucaena And Some Alternative Psyllid-Tolerant Shrub Legumes, R J. Jones, B Palmer
IGC Proceedings (1997-2023)
Five shrub legumes, Leucaena leucocephala cv.Cunningham, L. leucocephala cv.Tarramba, L. diversifolia CPI 33820, L. pallida CQ 3439 and Calliandra calothyrsus CPI 115690 were compared for yield and steer gain in comparison to an all-grass control. Shrubs were sown in rows 4 m apart and all treatments, including the control, were sown with the grass Urochloa mosambicensis cv.Nixon. Edible legume yield was highest for L. leucocephala cv.Tarramba and lowest for L. leucocephala cv.Cunningham. In the absence of psyllid attack, liveweight gains over a 5-week period in summer were highest with cv.Cunningham (1170g/d) and lowest for C. calothyrsus (391 g/d) and the …
Water Use In A Newly Established Pasture As Influenced By Grazing Management, M H. Entz, W P. Mccaughey
Water Use In A Newly Established Pasture As Influenced By Grazing Management, M H. Entz, W P. Mccaughey
IGC Proceedings (1997-2023)
The objective of this study was to determine the effects of grazing system and stocking rate on spring profile soil water, soil water extraction and evapotranspiration (ET) of a newly established grass/ legume pasture. The experiment, located on a fine sandy loam soil in western Manitoba, was a two replicate RCBD with continuous and rotational grazing at stocking rates of 1.1 and 2.2 steers/ha. The pastures contained alfalfa (Medicago sativa L.), meadow bromegrass (Bromus biebersteineii Roem and Shult.) and Russian wild ryegrass (Elymus juncea L.). Growing season ET averaged 38.4 cm and was consistently highest for …
Forage Based Fallow Management Strategies For Intensified Land Use And Resource Conservation In Small Holder Farms, M A. Mohamed Saleem, Kahsay Berhe
Forage Based Fallow Management Strategies For Intensified Land Use And Resource Conservation In Small Holder Farms, M A. Mohamed Saleem, Kahsay Berhe
IGC Proceedings (1997-2023)
Intensification of land-use is inevitable for long term food security in the east African highlands, but technological options need to be environmentally safe. How forages can be used as a basis for intensified grain and fodder production from the same land unit, and serve as a profitable fallow during necessary crop-free rest period is the purpose of this study.
The Effect Of Crop Residues On Cattle Productivity Wihtin Agropastoral Production Systems In Southern Mali, S.J L.E Leloup, L 'T Mannetje
The Effect Of Crop Residues On Cattle Productivity Wihtin Agropastoral Production Systems In Southern Mali, S.J L.E Leloup, L 'T Mannetje
IGC Proceedings (1997-2023)
The effect of seasonal diet on cattle productivity was studied in a village in southern Mali. A comparison of measured and simulated liveweight changes of cattle proved that crop residue consumption during the dry season has become indispensable for animal production. Correspondingly, maximum livestock numbers to be fed during the dry season appeared to be directed by crop residue availability. Apparently crop residue availability determines cattle productivity in this village. This is likely to be the case in most of southern Mali where the importance of rangelands’ perennial grasses is decreasing.
Grazing Impacts On The Production Stability Of Fescue Prairie, W D. Willms, J F. Dormaar, J R. King
Grazing Impacts On The Production Stability Of Fescue Prairie, W D. Willms, J F. Dormaar, J R. King
IGC Proceedings (1997-2023)
The fescue prairie in southwestern Alberta is highly productive but susceptible to grazing during the growing season. This study examined how production stability is affected by grazing impact. It was initiated in 1949 using four fixed stocking rates (1.2, 1.6, 2.4, 4.8 animal-unitmonths ha-1). Forage and livestock production were estimated over 4 or 15 years, respectively. The coefficient of variation (CV) for either primary or secondary production was constant over all rates except for the very heavily stocked paddock. Forage production, and therefore livestock production, in that paddock was dependent on precipitation during the growing season. Heavy grazing pressure resulted …
Dry Matter Allocation And Nutritive Value Of Tropical And Temperate Fodder Trees And Shrubs In The Gauteng Province Of South Africa, J P. Lindeque, N.F G. Rethman, C C. Botha
Dry Matter Allocation And Nutritive Value Of Tropical And Temperate Fodder Trees And Shrubs In The Gauteng Province Of South Africa, J P. Lindeque, N.F G. Rethman, C C. Botha
IGC Proceedings (1997-2023)
Fodder tree and shrub species from the genera Albizzia, Atriplex, Cassia, Chamaecytisus, Cytisus, Leucaena, Lupinus, Medicago, Sesbania and Teline were evaluated in terms of their adaptation to local conditions and potential production of protein-rich forage and fuelwood. Atriplex nummularia, Cassia sturtii, Chamaecytisus palmensis, Cytisus maderiensis, Leucaena species, Sesbania sesban and Teline stenopetala offer considerable potential, both in terms of yield of protein-rich forage and/or fuelwood.
The Role Of Tagasaste (Chamaecytisus Proliferus) In Farming Systems Of Southern Australia, E C. Lefroy, A K. Abadi Ghadim, N J. Edwards, M A. Ewing
The Role Of Tagasaste (Chamaecytisus Proliferus) In Farming Systems Of Southern Australia, E C. Lefroy, A K. Abadi Ghadim, N J. Edwards, M A. Ewing
IGC Proceedings (1997-2023)
Farm scale economic analysis of a recently developed alley cropping system based on the fodder shrub tagasaste (Chamaecytisus proliferus) was carried out using the optimising model MIDAS. The model was used to assess the potential application of this new farming system to infertile sandplain soils in southern Australia by comparing the profitability of improved serradella based annual pasture (Ornithopus compressus and O. sativa), tagasaste in plantations and tagasaste alley cropping. The third option was the most profitable, increasing sheep carrying capacity by 76% and resulting in 45% of the model farm being planted to tagasaste alley …
Short-Term Effects Of Grazing And Rest Treatments On The Seed Banks Of Two Contrasting Sites In The Semiarid Pampas, Argentina, M O. Aguilera, M M. Marchi, O Terenti
Short-Term Effects Of Grazing And Rest Treatments On The Seed Banks Of Two Contrasting Sites In The Semiarid Pampas, Argentina, M O. Aguilera, M M. Marchi, O Terenti
IGC Proceedings (1997-2023)
The germinable seed bank was characterized in relation to season, grazing, and site type at southcentral San Luis, Argentina. Vegetation is typical of the semiarid western extreme of the Pampas grasslands. Our objective was to evaluate the effect of grazing and rest during the growing season on seed banks for two contrasting sites. Seed banks were sampled twice, in spring and fall. In each date, soil cores were obtained in sanddune and flat sites, for pastures grazed or that remained ungrazed during the growing season. Soil was spread in trays under suitable conditions for germination. Evaluations were done on total …
Can The Restoration Of Degraded Rangelands Ever Be Economic?, N D. Macleod, J C. Noble, J R. Brown
Can The Restoration Of Degraded Rangelands Ever Be Economic?, N D. Macleod, J C. Noble, J R. Brown
IGC Proceedings (1997-2023)
Degradation of rangeland pastures in Australia is widespread and ongoing. The characteristics of many restoration technologies in relation to land values contribute to a perception of their being uneconomic. However, while this might be true within the general context of broadscale application, it need not be the case in specific instances. Both the underlying contexts and processes need to be considered in assessing the economic value of a given restoration technique for a given degradation problem.
Modifying Management Methods To Promote The Reform And Development Of Grassland Based Animal Husbandry Through Better Resource Use, Cui Heng-Xin, Zhang Jiang-Ling, Asya Jiang-Ling
Modifying Management Methods To Promote The Reform And Development Of Grassland Based Animal Husbandry Through Better Resource Use, Cui Heng-Xin, Zhang Jiang-Ling, Asya Jiang-Ling
IGC Proceedings (1997-2023)
The development of grassland livestock production cannot rely on the cost of pasture degradation. The stocking rate has to be based on the pasture production and it also has to be under the guidance of law. Changing management methods, development of grassland agriculture and optimization of the utilization of natural resources is the effective way of improving the reformation and development of grassland livestock production.
Native Grasses In The Pilbara Region, Australia; Resource Acquisition, Allocation And Growth, L J. Ingram, L T. Bennett, M A. Adams
Native Grasses In The Pilbara Region, Australia; Resource Acquisition, Allocation And Growth, L J. Ingram, L T. Bennett, M A. Adams
IGC Proceedings (1997-2023)
Biomass production and nitrogen content of the native perennial grasses, Barley Mitchell grass (Astrebla pectinata ) and Kangaroo grass (Themeda triandra), were studied over the 1996 growing season. After 160 mm of rain, the biomass of T. triandra increased from 2 to 4 t/ha, while A. pectinata increased from 1.1 to 1.5 t/ha. N in aboveground biomass of T. triandra increased from 14.5 to 17 kg/ha and of A. pectinata from 8.5 to 10 kg/ha. A. pectinata leaves senesced quickly increasing the total amount of N in dead leaves. T. triandra senesced more slowly but dead leaves …
The Effect Of Different Winter Utilization Periods Of A C4 Subtropic Foggage On The Growth Of Weaners, I F. Reckling, G.H J. Kruger
The Effect Of Different Winter Utilization Periods Of A C4 Subtropic Foggage On The Growth Of Weaners, I F. Reckling, G.H J. Kruger
IGC Proceedings (1997-2023)
A significant (P<0.05) increase in lick consumption was found, as winter progressed, which was attributed to a significant decline in the quality (P<0.05) of Digitaria eriantha foggage. Harvested treatments resulted in a significant (P<0.05) decline in residual soil nitrogen levels compared to unharvested treatments. Losses, due to trampling, on average was 21.25%. It is advocated that Digitaria eriantha ought to be utilised in summer and is only suitable for maintenance if utilised in winter.
Leucaena Leucocephala As A Supplement For Goats On Tropical Pastures, T Clavero, R Razz
Leucaena Leucocephala As A Supplement For Goats On Tropical Pastures, T Clavero, R Razz
IGC Proceedings (1997-2023)
A field experiment was conducted in the dryland farming area of Northwest Venezuela in order to evaluate three diets in grazing goats (pasture only; grazing pasture + 0.3 kg of commercial concentrate/ animal/d; grazing pasture + restricted grazing for 2 hours daily in Leucaena leucocephala) on milk production (mp) and milk composition (fat -f- and mineral concentration -mc-). The experiment was laid out as randomized block design. The data showed significant difference (P<0.05) between treatments. Milk production increased in 50 and 70% when goats had access to commercial concentrate or Leucaena graizing as well as grass pasture compared with the control treatment. Milk production in goats with access to Leucaena was insignificantly different than goats on concentrate. Treatments did not affect milk composition. The results suggest that Leucaena leucocephala can supply an adequate amount of nutrient with similar value to commercial concentrate for milk production in grazing goats.
The Effect Of Long-Term Grazing Treatments On The Establishment Of Woody Plants In A Southern African Savanna, G N. Smit, N.F G. Rethman
The Effect Of Long-Term Grazing Treatments On The Establishment Of Woody Plants In A Southern African Savanna, G N. Smit, N.F G. Rethman
IGC Proceedings (1997-2023)
Eight paddocks which were debushed to an open savanna during 1935/36 and subsequently grazed annually during different seasons by steers were surveyed after a period of 54 years. Though woody plants have increased in all the paddocks, regardless of the grazing treatment, the rate of woody plant establishment was notably higher in those paddocks that received a more intense annual grazing treatment. This effect was most noticeable in those paddocks of which the mean Animal Unit-grazing days ha-1 exceeded 100 days annually. These results confirm the existence of a positive linear relationship between the severity of the grazing treatment and …
Monitoring The Stabilization Of Semi-Arid Grassland In The Bridge Creek Watershed Of Central Oregon, R Demmer, L Andrews, B Keller
Monitoring The Stabilization Of Semi-Arid Grassland In The Bridge Creek Watershed Of Central Oregon, R Demmer, L Andrews, B Keller
IGC Proceedings (1997-2023)
Using land exchanges the Bureau of Land Management (BLM) in central Oregon consolidated its land base in the Bridge Creek Watershed between 1987 and 1992 to obtain a 64,500 acre land block. The uplands had been grazed and the valley bottoms farmed since the middle 1800s. Due to improper grazing, primitive irrigation, fire suppression and juniper invasion, the native vegetation was sparse. Weeds were ubiquitous, and soils were eroded. The results of actions taken after baseline inventories of riparian and range communities were monitored. This feedback prompted further actions. Monitoring confirms that increasing native vegetation and decreasing erosion is stabilizing …