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Articles 451 - 480 of 58711

Full-Text Articles in Physical Sciences and Mathematics

Botanical Composition, Improvement Intervention And Cattle Weight Gain Of Natural Pastures Of Western Ethiopia, L Gizachew, A Tadesse, A Hassen Aug 2024

Botanical Composition, Improvement Intervention And Cattle Weight Gain Of Natural Pastures Of Western Ethiopia, L Gizachew, A Tadesse, A Hassen

IGC Proceedings (1993-2023)

The dominant indigenous grass and legume species in the highland (above 2000 m) and mid-altitude (1600-2000 m) parts of western Ethiopia were determined. Grasslands in the high altitude contain a higher proportion of a nutritious grass and legume species than grasslands in the mid altitude. Fertiliser, manuring and legume oversowing improved dry matter yield and live-weight gains of grazing animals. Incorporating forage legumes into natural pastures by oversowing is the best pasture improvement strategy.

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Factors Affecting The Distribution Of Microlaena Stipoides On The Northern Tablelands Of New South Wales, D B. Magcale-Macandog, R.D B. Whalley Aug 2024

Factors Affecting The Distribution Of Microlaena Stipoides On The Northern Tablelands Of New South Wales, D B. Magcale-Macandog, R.D B. Whalley

IGC Proceedings (1993-2023)

The eJClent of and the factors affecting the disllibution of Microlaena sllpoldeJ on the Northern Tablelands of NSW were examined in a SHH:) of 102 paddocks on 33 properties. Relationships between the abundance of M. stilpoides and spatial, climatic and pasture management factors were determined udng 'X} tests. Paddocks with more abundant M. s,ipoides were obse1Yed in the eastern and southern parts of the Tablelands where alcitudc and rainfall are higher. Tree densit) also had a posilive association with its abundance as it grows well under shade. Cultivation and sowing of exotic pasture species initially eliminated 01 reduced the abundance …

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Seedling Emergence And Survival Of Medicago Minima And Erodium Cicutarium In Semi-Arid Argentina, D E. Fresnillo-Fedorenko, O Elia, O A. Fernandez, C A. Busso Aug 2024

Seedling Emergence And Survival Of Medicago Minima And Erodium Cicutarium In Semi-Arid Argentina, D E. Fresnillo-Fedorenko, O Elia, O A. Fernandez, C A. Busso

IGC Proceedings (1993-2023)

The emergence from naturally deposited seed of Medicago minima (L,) Grufb. var. minima (Mm) and Erodium circutarium (L.) L'Heril. (Ee) seedlings, and subsequent seedling survival, was studied under different levels of herbaceous vegetation cover in the Calden District ( 10 million ha) of semi-arid Argentina. Five cohorts of Mm seedlings and one of Ee were monitored throughout the 1989 growing season. Seedling emergence of Mm in areas with bare soil patches was about twice that in covered areas, while no differences in emergence of Ee between vegetation stales were found. Survival rates of Mm were lower In areas with bare …

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Recovery And Germination Of Switchgrass Seed Fed To Cattle, W R. Ocumpaugh, J W. Stuth, S R. Archer Aug 2024

Recovery And Germination Of Switchgrass Seed Fed To Cattle, W R. Ocumpaugh, J W. Stuth, S R. Archer

IGC Proceedings (1993-2023)

Mature rumen-cannulated crossbred steers (Bos spp.) maintained on a bermudagrass (Cynodon dactylon (L.) Pers.) hay diet were rumen ally dosed with switchgrass cv. Alamo (Panicum virgatum L.) seed. Seed we1e recovered from faeces (3 steers in Trial 1 and 7 steers in Trial 2) collected at 12, 24, 48, 72, 96 and 120 h post-feeding, Laboratory germination tests conducted on ·recovered seed indicated that germination decreased by 0,7 to 1.0 percentage unit/hour of rCllident time in the gastrointestinal tract. Variation was observed among steers within and among trials for a number of seed traits measured, but there was …

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Stability Of Windmill Grass Pastures Grazed By Sheep For 24 Years In Semi-Arid South-Eastern Australia, D L. Michalk, G E. Robards Aug 2024

Stability Of Windmill Grass Pastures Grazed By Sheep For 24 Years In Semi-Arid South-Eastern Australia, D L. Michalk, G E. Robards

IGC Proceedings (1993-2023)

Botanical composition and stability of disclimax perennial grasses was examined in a long-term (1967-1990) experiment grazed by Merino sheep at 3 stocking rates (2.5, 3.7 and 4.9 sheeplba) in semi­arid (480 mm annual rainfall) central-western New South Wales, Australia. After 24 years, continuous grazing improved ground cover, and increased occurrence (frequency of step-point recordings) of perennial grasses (Enteropogon acicularis, Chloris tuncata, Stipa : spp. and Danthonia spp.) could lead to the conclusion that progression in range condition had occurred at all stocking rates. However, demographic data indicate that when density (plants/m2) and size - (basal diameter) are considered, …

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Effects Of Quantity And Pattern Of Herbage Removal On Botanical Composition Of A Temperate Pasture, W Harris Aug 2024

Effects Of Quantity And Pattern Of Herbage Removal On Botanical Composition Of A Temperate Pasture, W Harris

IGC Proceedings (1993-2023)

Ryegrass-white clover (Lolium perenne L.- Trifolium repens L.) pasture was cut in continuous and .rotational patterns to provide herbage for 15, 20 and 25 ewes/ha. A comparison was made with grazed pasture. Dead matter content from rotational management decreased as stocking rate increased, but was high for high stocking rate continuous management when herbage requirements were high. Ryegrass decreased and clover content increased under continuous . management particularly as stocking rate increased. Unsown species • increased markedly under continuous management at high stocking. Changes of ryegrass and clover content under grazing were less than' under cutting possibly owing to …

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Structure Of Plant Communities In A Pastoral System In Northern Spain, I Alonso, A Garcia Aug 2024

Structure Of Plant Communities In A Pastoral System In Northern Spain, I Alonso, A Garcia

IGC Proceedings (1993-2023)

Six grassland communities on different soil types in northern Spain were analysed for species life-form and growth form composition, diversity, height and above-ground biomass in relation to grazing. Hemicryptophytic life-form was the most characteristic form. The grasslands on calcareous soils showed the greatest diversity values and the lowest peak above-ground biomass. Grasses were more abundant in siliceous soils than in calcareous soils, but in all communities the group "other families" was dominant.

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Native Grasses: Their Distribution And Management In South-Eastern Australia, P M. Dowling, D L. Garden, P C. Simpson, D Eddy, D R. Kemp Aug 2024

Native Grasses: Their Distribution And Management In South-Eastern Australia, P M. Dowling, D L. Garden, P C. Simpson, D Eddy, D R. Kemp

IGC Proceedings (1993-2023)

The economic survival of landholders depends on improving net returns. On the Tablelands of New South Wales, where substantial tracts of the original native perennial grasses still remain, an opportunity to do this exists by making belier use of these pastures. Over 150 years of grazing by sheep and cattle is considered to have resulted in the evolution of more grazing tolerant and nutrient­responsive grasses. This paper reports on the approach taken in developing a native grass strategy for tableland country, A survey sought to delineate the distribution of the native grass species under grazed conditions, while the feasibility of …

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Nitrogen Content Of Panicum Maximum When Grown With Stylo And Siratro Under Two Moisture Regimes, U R. Sangakkara, K B. Attanayake Aug 2024

Nitrogen Content Of Panicum Maximum When Grown With Stylo And Siratro Under Two Moisture Regimes, U R. Sangakkara, K B. Attanayake

IGC Proceedings (1993-2023)

The impact of 2 popular tropical legumes on the nitrogen (N) content of the rhizosphere and an associated grass (Panicum maximum) in a soil with low N status was evaluated. The effect of 2 soil moisture contents on this process, (a) field capacity - 25% depletion and (b) 50% depletion or below, was also studied. At the high soil moisture level, both legumes increased the N content of soil and Panlcum over the control. The N content of the soil and grass treatments containing stylo was marginally higher than in soils containing siratro. This phenomenon was less marked …

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Effects Of Endophyte In Perennial Ryegrass On Pasture Establishment And Botanical Composition In Victoria, P E. Quigley, N M. Mcfarlane Aug 2024

Effects Of Endophyte In Perennial Ryegrass On Pasture Establishment And Botanical Composition In Victoria, P E. Quigley, N M. Mcfarlane

IGC Proceedings (1993-2023)

Perennial ryegrass (Lolium perenne L.) plants, which contained an endophyte (Acremonium lolli), established at higher plant densities than ryegrass plants which seldom contained endophyte. Presence of endophyle did not affect ryegrass planl dry weight or tiller number. Application of phosphatic fertiliser, increased seeding rate, or use of seed which frequently contained endophyte could increase ryegrass tillers/m2• The growth of subterranean clover (Trifolium subterraneum L.), sown with the ryegrass, was reduced when endophyle was presenl in the grass. It is postulaled that the weaker growth of subterranean clover would prejudice its seed production and hence reduce the long-term …

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Inverted "T" Drill Openers For Pasture Establishment By Conservation Tillage, C J. Baker, M A. Choudhary, K E. Saxton Aug 2024

Inverted "T" Drill Openers For Pasture Establishment By Conservation Tillage, C J. Baker, M A. Choudhary, K E. Saxton

IGC Proceedings (1993-2023)

No-tillage is an increasingly acceptable practice for pasture renewal in New Zealand. Seeding and fertilising are the most difficult operations to consistently perform well in a residue-covered surface for establishment of subsequent pastures and crops. Two new seed drill openers for seed and fertiliser placement in conservation tillage are described. These openers, developed in New Zealand and tested extensively ln NZ, USA, Canada and Australia, create an inverted "T-shaped" slot, One version uses a single winged tine while the other version uses a single disk running straight ahead against which 2 winged side blades rub. They raise the soil for …

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Long-Term Sustainability Of Livestock-Producing Farming Systems In Contrasting Regions With Mediterranean-Type Climates, P S. Cocks, G Gintzburger Aug 2024

Long-Term Sustainability Of Livestock-Producing Farming Systems In Contrasting Regions With Mediterranean-Type Climates, P S. Cocks, G Gintzburger

IGC Proceedings (1993-2023)

The soils, vegetation, and sustainability of forming systems in west Asia and north Africa (WANA) are compared with those in southern Australia (SA). Although climates are similar, soils differ markedly; most of W ANA has young soils derived from limestone, while most of SA has old soils derived from previous periods of high rainfall. Initially, the soils of W ANA were more fertile than those of SA, their current infertility being associated with 10 000 years of agricultural exploitation. In contrast the fertility of soils in SA has increased in the 200 years since European settlement. In both regions agriculture …

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Fattening Performance Of Weaned Lambs Grazed On Common Vetch-Barley Mixture Sown On Fallow Land, A Elicin, M Ilaslan, M Munzur, S Cangir, A Karabulut Aug 2024

Fattening Performance Of Weaned Lambs Grazed On Common Vetch-Barley Mixture Sown On Fallow Land, A Elicin, M Ilaslan, M Munzur, S Cangir, A Karabulut

IGC Proceedings (1993-2023)

The aim of investigation was to estimate faltening performance of 40 weaned 2.5-month-old single male Akkaraman lambs grazed on a barley and common vetch mixture grown on summer fallow. The first group was grazed on the mixture only, the second group was grazed on the mixture + 500 g concentrate feed a day, the third group was grazed on the mixture + ad lib. concentrate feed and the last group was fed solely on concentrate feed. The investigation lasted 42 days, Average live-weight gains of the groups were 10.2, I 1.3, 11.3 and 10.3 kg and their daily live-weight gains …

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A Subterranean Clover Ideotype For A Cool Temperate Environment, P M. Evans Aug 2024

A Subterranean Clover Ideotype For A Cool Temperate Environment, P M. Evans

IGC Proceedings (1993-2023)

Data from several experiments in Tasmania (40-42°S; 500-700 mm annual rainfall) were examined to test the hypothesis that a successful cultivar of subterranean clover (Trifolium subterraneum L.) should be late maturing, soft seeded, high seed yielding and competitive. Maturity alone accounted for 68% of the variation in spring production, On average, for every day increase in time to flower, production increased by 43 kg/ha. In the field seed losses averaged 25% per year and, after 3 seasons, no differences were apparent between "soft-" and "hard-seeded" cultivars in total seed loss. Success in this environment does not appear to be …

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Effect Of Some Characteristics Of Diurnal Temperature Fluctuations On The Softening Of Hard Seeds Of Medicago Polymorpha, G B. Taylor Aug 2024

Effect Of Some Characteristics Of Diurnal Temperature Fluctuations On The Softening Of Hard Seeds Of Medicago Polymorpha, G B. Taylor

IGC Proceedings (1993-2023)

The softening of hard seeds of Medicago polymorpha is a 2-stage process. The final stage of softening. tends to take place in autumn, thereby affording the seeds some degree of protection against germination and subsequent loss after summer rain. Temperature conditions associated with this final stage of seed softening were investigated within the range 5-55°C. The required amplitude of diurnal temperature fluctuation was about 30°C, with a daily maximum between 30-45°C and a minimum less than 20°C. The slower the temperature fall, the more effective the temperature fluctuations, Between 4 and 8 diurnal cycles of the most favourable temperature conditions …

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China Grass (Pemiisetum Polystacliion (L,) Shult) Pasture In Northern Benin: Fodder Species Composition, Productivity, Feed Value And Grazing Value, J Lejoly, B Sinsin Aug 2024

China Grass (Pemiisetum Polystacliion (L,) Shult) Pasture In Northern Benin: Fodder Species Composition, Productivity, Feed Value And Grazing Value, J Lejoly, B Sinsin

IGC Proceedings (1993-2023)

China grass pasture occurs mainly on fallow lands throughout northern Benin, Floristic analysis showed an average number of 31 species among which 55% are recognised as palatable. Forage categories (%) were: good grasses 0.1; medium value grasses 29.8; poor quality grasses 4.3; legumes 24.l; miscellaneous forbs 27.2 and unpalatable species 14.5. China grass (Pe1111ise1Um polystachion) accounted for 20.4%. Maximum dry matter (OM) production of the pasture recorded at the end of the growing season was 6.30 I/ha, Weighting contributive value of china grass lo the productivity was 48.1 %; its digestible protein content decreased from 34.1 g/kg OM at the …

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Effects Of Phosphate And Stocking Rate On Mediterranean Grasslands In Northern Syria, A E. Osman, P S. Cocks Aug 2024

Effects Of Phosphate And Stocking Rate On Mediterranean Grasslands In Northern Syria, A E. Osman, P S. Cocks

IGC Proceedings (1993-2023)

Three rates of phosphate (0, 11 and 26 kg/ha P) were applied to phosphorus-deficient native grassland in northern Syria, and botanical composition, biomass and legume seed production were monitored. The experiment was grazed at low and high ( 1.1 and 2.3 sheep/ha per year) stocking rates. The site is typical of native grassland within the cereal zone of west Asia where cropping is not possible because of shallow, stony soils and steep slopes. Results showed that annual applications of P, even as low as 11 kg P/ha, corrected the deficiency in soil P and improved pasture production. The practical Implications …

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Constraints And Opportunities For Turkish Grasslands Use Patterns And The Expected Development Of Forage Crops, With The South-Eastern Anatolian Project (Gap) In Turkey, T Tukel, T Saglamtimur, H Gulcan, V Tansi, A E. Anlarsal Aug 2024

Constraints And Opportunities For Turkish Grasslands Use Patterns And The Expected Development Of Forage Crops, With The South-Eastern Anatolian Project (Gap) In Turkey, T Tukel, T Saglamtimur, H Gulcan, V Tansi, A E. Anlarsal

IGC Proceedings (1993-2023)

Turkey has 78 million ha land area. Of this, about 28% covers permanent grasslands, 36% arable land, and 30% forest and woodlands. Mainly, ii has a typical mediterranean climate but with regional differences. In general, Turkish grasslands are continuously being overutilised. There are 3 utilisation systems called sedentary, transhumance and nomadic. Each not only has its constraints but also some rational use under special situations. Intensive feeding programmes with high yielding and quality forage crops are also being encouraged. Recently, a national project, the south-eastern Anatolian Project (GAP in Turkish), is proceeding in the form of a big regional development. …

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Subterranean Clover Pasture Improvement And Utilisation In The Andes Foothills Of The Mediterranean Subhumid Zone Of Chile, Hernan Acuna, Patricio Soto, German Klee Aug 2024

Subterranean Clover Pasture Improvement And Utilisation In The Andes Foothills Of The Mediterranean Subhumid Zone Of Chile, Hernan Acuna, Patricio Soto, German Klee

IGC Proceedings (1993-2023)

The effects of phosphorus (P) and potassium (K) application on subterraneum clover (Trifolium subterraneum) cv. Mount Barker dry matter (DM) yield were measured in cutting and grazing experiments. Residual nitrogen (N) in soil, after 5 years, was estimated by growing wheat with different N rates. The soil is of volcanic ash origin and has high P retention. The annual rainfall is around 1300 mm, mainly in winter. P application increased DM production (3-7 I/ha/year on average), the clover proportion and the available P in soil (0-50 mm depth). The available N in soil increased from year to year, …

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Development And Evaluation Of A Core Germplasm Collection Of Annual Medicago Species In The United States, G R. Bauchan, N Diwan, M Mcintosh Aug 2024

Development And Evaluation Of A Core Germplasm Collection Of Annual Medicago Species In The United States, G R. Bauchan, N Diwan, M Mcintosh

IGC Proceedings (1993-2023)

The annual medics are endemic to the Mediterranean region. There are 34 recognised species of annual medics and 3159 accessions in the US Plant Introduction collection. Although there is interest in the annual medics for use in sustainable agricultural systems, the US collection is underutilised owing to a lack of agronomic information. Development of a core collection may be a method of condensing the collection of agronomic data on the available germplasm to make it more accessible for utilisation by breeders and agronomists. A core germplasm collection is a small collection that represents the maximum genetic diversity with minimum repetitiveness. …

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Persistence And Productivity Of Some Forage Varieties And Land Races Of Different Origin Grown In Central Italy, M Falcinelli, F Veronesi, L Russi, P Pollidori Aug 2024

Persistence And Productivity Of Some Forage Varieties And Land Races Of Different Origin Grown In Central Italy, M Falcinelli, F Veronesi, L Russi, P Pollidori

IGC Proceedings (1993-2023)

In Italy, the lack of interest in producing seed of improved and adapted varieties of forage species, particularly of grasses, has caused a widespread utilisation of foreign varieties imported from northern Europe and North America. Most of these varieties are not adapted to a mediterranean climate and, hence, are less persistent and productive than the local varieties. Persistence and productivity of 17 grass (Lolium perenne, L. multiflorum, Dactylias glomerata, Festuca arundinacea) and 19 legume (Medlcago saliva, Trlfolium repens, T. pratense, Lotus cornicidatus, L. teaulus, L. peduncllatus) varieties and land races from Italy, northern Europe and New …

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Refining A Residual Dry Matter Technique For Assessing Standing Biomass Estimates In Grazed Mediterranean Ecosystems, J R. Brown, M Cocke, L Steffen Aug 2024

Refining A Residual Dry Matter Technique For Assessing Standing Biomass Estimates In Grazed Mediterranean Ecosystems, J R. Brown, M Cocke, L Steffen

IGC Proceedings (1993-2023)

Because most water quality objectives are set at the watershed level, it is important to determine hydrologic characteristics of land units within watersheds and predict the impact of land uses and treatments on watershed outputs. Rangeland hydrology research indicates that vegetative cover and biomass are reliable indicators of sediment production from uplands, The Residual Dry Matter (RDM) technique (Clawson et al. 1980} is a proven method of assessing standing crop biomass. This technique is easily learned and observer independent. After one training session, observers were able to estimate accurately (R2>0.90) the amount of biomass on the soil surface. RDM …

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Influence Of Level And Distribution Of Nitrogen Fertiliser On The Availability And Quality Of Kikuyu Foggage, N F.G Rethman, C C. De Witt Aug 2024

Influence Of Level And Distribution Of Nitrogen Fertiliser On The Availability And Quality Of Kikuyu Foggage, N F.G Rethman, C C. De Witt

IGC Proceedings (1993-2023)

The value of pasture rested in the late growing season for use as foggage during the dormant season is well known. More detailed information on the influence of nitrogen (N) fertilisation practices (level and distribution) on the availability and quality of kikuyu (Pennisetum clandestfoum Chiov.) foggage was obtained from a small­plot clipping trial incorporating 3 levels of N (100, 200 and 300 kg/ ha) and 4 distributions. Prom these results it is evident that dry matter responses were obtained up to 200 kg N/ha, whereas the crude protein responses were linear up to 300 kg N/ha applied in the …

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Evaluation Of Setaria Sphacelata Var. Splendida In Mediterranean Irrigated Conditions. I. Effect Of Cutting Frequency On Chemical Composition And Nutritive Value, P C. Tenreiro Aug 2024

Evaluation Of Setaria Sphacelata Var. Splendida In Mediterranean Irrigated Conditions. I. Effect Of Cutting Frequency On Chemical Composition And Nutritive Value, P C. Tenreiro

IGC Proceedings (1993-2023)

Chemical composition and nutritive value of Setaria sphacelata var. splendida were studied under 3 culling frequencies, 14, 28 and 56 days, under mediterranean irrigated conditions. The effect of cutting frequency on chemical composition and nutritive value was evaluated by measuring crude protein, structural and non-structural carbohydrates and dry mailer digestibility. Metabolisable energy was also estimated. Nutritive value was not strongly affected by cutting frequency and acceptable quality was found in the 56 days treatment (60% IVDMD, 8.5 MJ MB/kg OM, 10% CP). The results achieved are similar to those obtained With annual summer forage grasses like Sorghum spp.

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Evaluation Of Setaria Sphacelata Var. Splendida In Mediterranean Irrigated Conditions. Ii. Effect Of Cutting Frequency On Growth Pattern And Yield, P C. Tenreiro Aug 2024

Evaluation Of Setaria Sphacelata Var. Splendida In Mediterranean Irrigated Conditions. Ii. Effect Of Cutting Frequency On Growth Pattern And Yield, P C. Tenreiro

IGC Proceedings (1993-2023)

Growth pattern, yield and forage productivity of irrigated Setaria sphacelata var. splendida under mediterranean conditions were studied under 3 cutting frequencies, 14, 28 and 56 days, and without cutting. Increases in cutting frequency had a detrimental effect on yield and forage productivity. Higher total biomass production (1.6S8 kg DM/m2), crop growth rate (21.S g/m2/day), LAI (4,8) and radiation use efficiency (1.1 g DM/MJ) were observed at S6 days cutting interval. The highest biomass production (3,295 kg DM/m2) was found with uninterrupted growth. Biomass production at 56 days interval was similar to that found with maize and sorghum but forage productivity …

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Water Use And Productivity Of Annual Legume-Based Pasture Systems In The South-West Of Western Australia, T P. Bolger, N C. Turner, B J. Leach Aug 2024

Water Use And Productivity Of Annual Legume-Based Pasture Systems In The South-West Of Western Australia, T P. Bolger, N C. Turner, B J. Leach

IGC Proceedings (1993-2023)

There Is a perception in the farming and research communities of a general decline in the productivity of annual pastures in the mediterranean climatic zone of Australia. Plant growth and water use often are linearly related in water-limited environments. Consequently, pastures are seen as having low water use and contributing to problems of land degradation. Our aim was to determine potential pasture production in relation to rainfall and the influence of management factors on growth and water use. Experiments were initiated at S locations along a gradient of 300-Ll00 mm annual rainfall. At each site a maximum production treatment was …

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Dana- A Low Input Grass, For Sustainable Production In The Summer Rainfall Areas Of South Africa, P A. Pieterse, J Van Bosch, N F.G Rethman Aug 2024

Dana- A Low Input Grass, For Sustainable Production In The Summer Rainfall Areas Of South Africa, P A. Pieterse, J Van Bosch, N F.G Rethman

IGC Proceedings (1993-2023)

Bana, a South African hybrid between Pennisetum purpureum and Penmisetumn glantcum, was evaluated in a fertiliser trial at the University of Pretoria. The initial pH(H20) of the soil was 4.2, the P status 12 my/ kg and the K status 50 mg/kg, A third of the.plots were treated with Ca(OH)2, to raise the pH(H20) to 5.6, while on another third, the pH was raised to 6.5. There were 4 nitrogen treatments, 0, 100, 200 and 400 kg N/ha/year, Production and quality was measured during 3 consecutive seasons, after the season of establishment. The treatment which received no N produced 14.5 …

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Improvement Of Pastures Through The Management Of Nitrogen-Fixing Rhizospheric Organisms, R Thanopoulos, I O. Kefalogiannis Aug 2024

Improvement Of Pastures Through The Management Of Nitrogen-Fixing Rhizospheric Organisms, R Thanopoulos, I O. Kefalogiannis

IGC Proceedings (1993-2023)

The nitrogen fixation performance of some typical members of Greek pastures was examined under comparable conditions. The plants were grown on non-inoculated soil samples taken from 3 different regions of Greece. High N-fodng activity was detected in nodulated roots of Trifolium pratense and Medicago saliva but comparatively lower in Trifolium repens, T. hybridwn and Lotus comiculallls. Also, high activity was noted in the rhizosphere of the grasses Lolium perenne and Phalaris aquatica. The isolation of highly efficient N-fixing indigenous Rhizobium strains is reported.

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The Chaco Savanna Lands Of South America With Particular Reference To The Processes Of Degradation In Their Pastoral And Forestry Resources, Carlos Saravia Toledo Aug 2024

The Chaco Savanna Lands Of South America With Particular Reference To The Processes Of Degradation In Their Pastoral And Forestry Resources, Carlos Saravia Toledo

IGC Proceedings (1993-2023)

The South American Chaco, covering more than 1.2 million km2, is second only to the Amazonian natural savanna region. It is the southern extension of the vast savanna zone of the continent, ranging 2000 km on either side of the Tropic of Capricorn. In its pristine state it presented vast pastoral and forestry resources, but in less than 120 years, these resources have been devastated by their uncontrolled exploitation. For most of the drier half of the region the productivity has declined to very low levels. The pastoral resources were decimated by uncontrolled livestock grazing of cattle, sheep, goats, pigs, …

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Ruminant Animal Production From Forages: Present Position And Future Opportunities, David E. Beever Aug 2024

Ruminant Animal Production From Forages: Present Position And Future Opportunities, David E. Beever

IGC Proceedings (1993-2023)

The utilisation of forages by ruminants for the synthesis of meat and milk is often below expectations both in terms of the quantity and the composition of the product. Recognising that the nutrition of the ruminant is complicated by the need to meet the requirements of the host animal and its rumen ecosystem, it is now possible to identify the causes of some of these inefficiencies and to develop suitable strntegies to overcome them. This paper attempts, through a review of the mechanisms of carbohydrate and protein utilisation in the rumen and in the animal tissues, and identification of the …

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