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Articles 61 - 90 of 39752

Full-Text Articles in Physical Sciences and Mathematics

Relationships Between Growth And Carbon Isotope Discrimination For Some Pasture Species, J Virgona Sep 2024

Relationships Between Growth And Carbon Isotope Discrimination For Some Pasture Species, J Virgona

IGC Proceedings (1993-2023)

Carbon isotope discrimination (A) by plants can be directly related to plant water-use efficiency (W, total plant dry matter, OM, per water transpired) and used in selection to achieve greater W. As \V (and A) is a complex characteristic, there maybe inherent relationships between it and plant productivity. A range of pasture cultivars (of temperate grasses and legumes) were grown in pots (lo c. 50 days) and \V, A and total dry mailer measured. Among cultivars the relationship between W and A was negative and significant as was the relationship between A and total OM accumulation. A further experiment showed …

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Acquisition And Allocation Of Phosphorus In A Population Of White Clover Plants In A Rotationally Grazed Pasture, M.J M. Hay, D F. Chapman Sep 2024

Acquisition And Allocation Of Phosphorus In A Population Of White Clover Plants In A Rotationally Grazed Pasture, M.J M. Hay, D F. Chapman

IGC Proceedings (1993-2023)

This paper quantifies the processes of acquisition, allocation and retranslocation of phosphorus (P) within a white clover (Trifolium repens L.) population in a mixed grass-clover pasture during a regrowth period in early winter (13 May-8 July 1991). The work described is part of a broader study examining seasonal variation in these processes. The data allows an analysis of the changing P economy of plants and of whole populations. White clover plants were grouped by !heir hierarchy of branching. Within plants, stolons were grouped by order of branching, dissected into leaf, stolon and root, oven-dried, weighed and analysed for P …

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Defoliation Of Young Branch And Parent Stolons Of White Clover In Rotationally Grazed Pastures, M.J M. Hay, M Kim, R W. Mclean, A Gonzalez-Rodriguez Sep 2024

Defoliation Of Young Branch And Parent Stolons Of White Clover In Rotationally Grazed Pastures, M.J M. Hay, M Kim, R W. Mclean, A Gonzalez-Rodriguez

IGC Proceedings (1993-2023)

This study was undertaken to examine the relative severity of defoliation of young branches (those comprising <4 nodes) and parent stolons of white clover (Trifolium repens L.) in rotationally grazed pastures stocked al either 2.5, 5.0 or 7.5 bulls/ha. On 7 occasions over a year, the defoliation of expanded leaves of parenl and branch stolons was assessed using tagged stolons. Petiole length of leaves ,vas measured before grazing. Leaves of young branch stolons (43% of the total number of leaves defoliated) were less severely defoliated than leaves of parent stolons (64%). Defoliation of branch stolon leaves was relatively greater at the higher stocking rates which had lower residual …

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Effects Of Temperature, Nitrgoen Fertilizer, And Cutting Height On Regrowth And Dry Matter Production, Hyo Won Lee, Mu Hwan Jo, Chang Ho Kim Sep 2024

Effects Of Temperature, Nitrgoen Fertilizer, And Cutting Height On Regrowth And Dry Matter Production, Hyo Won Lee, Mu Hwan Jo, Chang Ho Kim

IGC Proceedings (1993-2023)

Orchardgrass (Dactylis glomerata L.) is used extentively in South Korea for green-chop and pasture mixtures. Maintaining orchardgrass stands over summer is a major problem in South Korea. Orchardgrass was grown in soil in growth chambers to evaluate the effect of temperature (day/night:20/JO, 27/17 and 3S/25°C), nitrogen (N) application (0, 5 and 10 kg/ha) and cutting height (5 and IO cm) on plant height, above­and below-ground dry matter yield, and leaf area accumulation. High temperatures (35/25°C) greatly reduced plant height, DM yields and leaf area expansion, Cutting to 10 cm gave greater DM yields and leaf areas, compared to cutting to …

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Lucerne Dry Matter Accumulation Rate In Yield Differences, D W. Evans, R N. Peaden, W P. Ford Sep 2024

Lucerne Dry Matter Accumulation Rate In Yield Differences, D W. Evans, R N. Peaden, W P. Ford

IGC Proceedings (1993-2023)

Lucerne (Medicago sativa L.) improvement historically has been directed at pest resistance, adaptation to climatic conditions and yield. Successful methods of detecting and increasing natural resistance to a range of insect and disease pests have been developed. Knowledge of what plant factors can be successfully manipulated to increase yield per se is less advanced. This research compared several lucernes differing in type and in date of release to determine if different rates of closed-canopy, forage dry matter accumulation have been a factor in yield increases, particularly between older and more recent material. Ten entries ranging in release date from …

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Improving Germination And Seedling Establishment Of Chicory, S N. Hur, W F. Hunt Sep 2024

Improving Germination And Seedling Establishment Of Chicory, S N. Hur, W F. Hunt

IGC Proceedings (1993-2023)

Chicory (Cichorium intybus L.) seeds were treated before sowing with polyethylene glycol (PEG 6000) under different PEG concentrations, treatment period and temperatures, and tested for uniformity of germination, establishment and drought tolerance. Suitable seed coating materials were found that improved emergence, establishment and seedling growth when surface sown on established swards. The best primed or coated seeds in germination tests were surface sown in growth cabinet and field.Osmotic priming with PEG accelerated germination of chicory and significantly reduced time taken for germination compared with coated seeds in Petri-dishes, but not in the field. In contrast, coated seeds germinated more slowly …

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Growth Of Temperate Perennial Legumes Over Three Cycles Of Defoliation At Different Temperatures, M A.P Duarsa, M J. Hill, J V. Lovett Sep 2024

Growth Of Temperate Perennial Legumes Over Three Cycles Of Defoliation At Different Temperatures, M A.P Duarsa, M J. Hill, J V. Lovett

IGC Proceedings (1993-2023)

Summer-active legumes such as big trefoil (Lollis ped11nc11lat11s), birdsfool trefoil (Lot11s comic11la111s), crownvelch (Coronilla varia) and cicer milkvetch (Astraga/11s cicer) are needed for summer rainfall areas of the perennial pasture zone in eastern Australia where soil conditions and grazing management do not suit lucerne (Medicago sativa). The growth of these species was compared at 4 temperatures regimens (14/10, 18/14, 22/18, 26/22°C, 12:12 h) for 3 cycles of regrowth where soil moisture was serially changed from field capacity (FC) to 50% PC and back to PC in a growth cabinet pot experiment. Growth rates in lucerne always exceeded those of the …

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Nutrient Cycling In Semi-Arid Grasslands And Savannas: Its Influence On Pattern, Productivity And Stability, Robert J. Scholes Sep 2024

Nutrient Cycling In Semi-Arid Grasslands And Savannas: Its Influence On Pattern, Productivity And Stability, Robert J. Scholes

IGC Proceedings (1993-2023)

The grazing animal carrying capacity of tropical semi-arid rangelands is largely controlled by rainfall, but above about 500 mm per annum, soil nutrient status has an overriding role. On low-nutrient soils, which cover vast areas of the ancient land surfaces of Africa, South America and Australia, it is the amount of grass eaten and digested that controls animal production, not the amount produced. On nutrient­poor soils (particularly those deficient in nitrogen and phosphorus) the primary production continues to increase with increasing rainfall, but the acceptability of the forage to ruminants declines, On the nutrient-rich soils of younger land surfaces, both …

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Soil Characteristics And Processes Critical To The Sustainable Use Of Grasslands In Arid, Semi-Arid, And Seasonally Dry Environments, John Williams, Keith R. Helyar, Richard S.B Greene, Rosemary A. Hook Sep 2024

Soil Characteristics And Processes Critical To The Sustainable Use Of Grasslands In Arid, Semi-Arid, And Seasonally Dry Environments, John Williams, Keith R. Helyar, Richard S.B Greene, Rosemary A. Hook

IGC Proceedings (1993-2023)

The focus of this paper is a framework for determining the soil and land properties and processes which are critical to managing grasslands in an ecologically sustainable manner. Essential to the discussion is the development of concepts which allow description of the stability, resilience and sustainability of the agroecosystem as a whole as well as the land resource base. The regions of Australia with arid, semi-arid and seasonally dry environments are defined and related to the dry environments of the world. This provides a background for a brief consideration of major vegetation types and soils within the dry environments of …

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Soil Animal Composition And Distribution In The Leymus Chinensis Grassland Region In Central Part Of North-East Of China, Yin Xiuqin, Li Jiandong, Zhu Tingcheng Sep 2024

Soil Animal Composition And Distribution In The Leymus Chinensis Grassland Region In Central Part Of North-East Of China, Yin Xiuqin, Li Jiandong, Zhu Tingcheng

IGC Proceedings (1993-2023)

Since 1990, we have investigated the soil animal composition and distribution in the Leymus chinensis (Aneuro chinensis) grassland region in central part of north-east of Chinn. Soil animals were studied in 20 plant communities in 4 habitats. A total of 15 797 soil animals belonging to 4 phyla, 6 classes, 28 orders and 86 families were obtained. Among them, 26 families and 22 species were new records in norlh-easl of China. The dominant groups were Formicidne, Actinedida, Oribatidn, lsotomidne, Rhnbditidae, Dorylainidae. Sparse woods of Ulmus, and the most animal groups (40) and Puccinellia chinapoesis and Heleochalis intersiIa …

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Breeding Phalaris For Tolerance To A Range Of Acid Soils, R N. Oram, A M. Ridley, J Hunter, H E. Schroeder, J Taylor Sep 2024

Breeding Phalaris For Tolerance To A Range Of Acid Soils, R N. Oram, A M. Ridley, J Hunter, H E. Schroeder, J Taylor

IGC Proceedings (1993-2023)

Phalaris (Phalaris aquatica L.) is a persistent, drought-hardy grass adapted lo mediterranean climates, but it is sensitive to free aluminum in acid soils. P. arundinacea L is more tolerant of soil acidity, and therefore it has been crossed to P. aquatica, followed by 1 or 2 backcrosses to P. aquatica. Open-pollinated progenies generated by I or 2 generations of random mating without selection were tested at 3 acid soil sites in Victoria and ACT. The mean herbage yields in winter were lower than the phalaris controls, but heritability and expected selection responses were high. There are good prospects …

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Intraspecific Variation For Salt Tolerance In White Clover, M E. Rodgers, C L. Noble, M E. Nicolas, G M. Halloran Sep 2024

Intraspecific Variation For Salt Tolerance In White Clover, M E. Rodgers, C L. Noble, M E. Nicolas, G M. Halloran

IGC Proceedings (1993-2023)

Variation in the salt tolerance of 10 commercial cultivars of white clover (Trifolium repens L.) was evaluated in greenhouse and field· experiments over a range of NaCl concentrations. Cultivars differed significantly in terms of yield, shoot ion concentrations and parameters of growth such as leaf expansion and petiole elongation rates but not in the root concentrations of Cl or Na. The ability to control the entry and distribution of Cl and Na into the shoot (demonstrated by tolerant cultivars Haifa and irrigation compared with sensitive cultivars Ladino and Tamar) was related to the salt tolerance rankings observed in both …

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Breeding For Tolerance To Toxic Levels Of Aluminum In Alfalfa, T A. Campbell, Z L. Xia, P R. Jackson, C D. Foy, G R. Bauchan Sep 2024

Breeding For Tolerance To Toxic Levels Of Aluminum In Alfalfa, T A. Campbell, Z L. Xia, P R. Jackson, C D. Foy, G R. Bauchan

IGC Proceedings (1993-2023)

An estimated 40% of all arable soils are acidic, and aluminum (Al) toxicity is often the primary plant-growth-limiting factor in these soils. Bxcess exchangeable Al is especially harmful in subsoils because it reduces rooting depth and branching and predisposes plants,to injury by drought. Our research to date indicates that there is substantial genetic variation in alfalfa (Medicago sativa L.) in response to toxic levels of Al, but that phenotypic recurrent selection appears to have been only marginally effective in selecting for Al tolerance. Possible alternative breeding approaches would entail re-evaluating selections to help obviate the effects of genotype x environment …

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Evaluating Livestock Selling Strategies Based On Forage Availability, Lucas D. Parsch, W M. Watts, O J. Loewer, P L. Luster Sep 2024

Evaluating Livestock Selling Strategies Based On Forage Availability, Lucas D. Parsch, W M. Watts, O J. Loewer, P L. Luster

IGC Proceedings (1993-2023)

The ORAZB simulation model was used to evaluate 4 alternative decision rules to trigger the removal of stocker steers from pasture in order to avoid risk when pasture conditions are suboptimal, Each of the four decision rules was simulated for 8 stocking rates over a 13- year period, Results of the analysis indicated that decision rules which trigger livestock removal based on minimum herbage availability result in shorter grazing periods and higher average daily gain compared with decision rules which trigger removal based on livestock weight loss. Although decision rules based on minimum herbage availability thresholds resulted in the highest …

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Grazing System And Grazing Pressure Effects On Herbage And Lamb Production From Subclover Interseeded Annual Grassland, Thomas C. Griggs, Milton B. Jones, Montague W. Demment Sep 2024

Grazing System And Grazing Pressure Effects On Herbage And Lamb Production From Subclover Interseeded Annual Grassland, Thomas C. Griggs, Milton B. Jones, Montague W. Demment

IGC Proceedings (1993-2023)

Information on management effects on the productivity of improved mediterranean annual grassland pastures in California is limited, Our objectives were to compare herbage and lamb production in subclover (Trlfolium subterraneum L.)-seeded annual grassland under different intensities of continuous and rotational systems of grazing. Grazing systems at 3 grazing pressures were applied in a factorial arrangement to 12 0.6S-ha pastures in a randomised complete block design replicated twice. Targhee lambs grazed pastures from 28 February to 9 May in 1989 and from S March to 1 May in 1990. Lambs occupied each of the eight paddocks in rotations for 1-4 …

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Intensive Grazing Of High Producing Holstein Cows: Milk Production, Forage Utilization And Profit Potential At Three Stocking Rates, S L. Fales, L D. Muller, M O'Sullivan, L E. Lanyon, R J. Hoover, L A. Holden Sep 2024

Intensive Grazing Of High Producing Holstein Cows: Milk Production, Forage Utilization And Profit Potential At Three Stocking Rates, S L. Fales, L D. Muller, M O'Sullivan, L E. Lanyon, R J. Hoover, L A. Holden

IGC Proceedings (1993-2023)

A farmlet study was conducted to investigate lhe potential for improving dairy productivity and profit potential through increasing stocking rates above those commonly used in 1he north-eastern USA. High-producing Holstein cows were grazed at seasonal stocking rotes (SR) of 3.9 (HSR), 3.2 (MSR) and 2.5 (LSR) cows/ha. Measurements were taken of quantity and quality of pasture offered to cows, silage harvested and fed and milk production during 175 days of grazing in 1990. Results showed a direct relationship between stocking rote and pasture quality and a negative relationship with the percentage of the pasture rejected by cows. Milk production (mean, …

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Intensive Grazing Systems And Methods For Beef Cattle, V G. Allen, J P. Fontenot, M A. Cochran, A Brock, W Mcclure, J Wilkins Sep 2024

Intensive Grazing Systems And Methods For Beef Cattle, V G. Allen, J P. Fontenot, M A. Cochran, A Brock, W Mcclure, J Wilkins

IGC Proceedings (1993-2023)

Three experiments were conducted to determine effects of grazing systems and methods on beef production. In experiment 1, cows, calves and stockers grazed tall fescue-clover (Festuca arundinacea-Trifolium repens) in a l 6-paddock system using rotational stocking or a 3-paddock system using continuous stocking as grazing methods. In experiment 2, stocker steers grazed orchardgrass-clover (Dactylis glomerata-Trifolium pratense) using buffer grazing with continuous stocking or a 14-paddock rotational stocking method. In experiment 3, 4 grazing systems were compared using sequence grazing combinations of cool-and warm­seasoo perennial and annual forages. In experiments l and 2, there were no differences in …

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Selection Pattern Of Holstein-Zebu Cows Grazing Stoloniferous And Tufted Type Tropical Grasses In A Cafeteria Type Trial, Francise E. Davis Sep 2024

Selection Pattern Of Holstein-Zebu Cows Grazing Stoloniferous And Tufted Type Tropical Grasses In A Cafeteria Type Trial, Francise E. Davis

IGC Proceedings (1993-2023)

Seven stoloniferous and 7 tufted grasses are being evaluated in a long­term trial on an acid ultisol in Trinidad in duplicate 3x3 m plots. The grasses were cut at five weekly intervals and nitrogen at 40 kg/ha applied after every harvest. A basal dressing of 125 kg P20􀀏, and 100 kg '½O and a trace element mix was applied twice annually. After culling in May 4 milking cows were allowed to graze the area. There was no significant difference in dry matter yield between the stoloniferous and tufted grasses, but there were significant differences within each type of grass in …

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Effect Of Percentages Calluna Vulgaris Cover And Cow And Ewe Physiological Status On Animal Production On Mountain Pastures, K Osoro, R Celaya, Mamen Olivan Sep 2024

Effect Of Percentages Calluna Vulgaris Cover And Cow And Ewe Physiological Status On Animal Production On Mountain Pastures, K Osoro, R Celaya, Mamen Olivan

IGC Proceedings (1993-2023)

The effect percentage cover of Calluna vulgaris (30 or 70%) on performance of dry and lactating ewes and cows with their lambs and calves was studied during 1990 and 1991. Lactating cows had greater body weight losses than dry ones, the difference being 0.3 and 0.S kg/day for 1990 and 1991 respectively. Percentage C.vulgaris cover (30 or 70%) caused differences in body-weight losses· similar to those caused by physiological status. Milk production from the cows, and therefore calf live-weight gain, were significantly higher in the group grazing on the plot with 30% Calluna (0.62 and 0.71 kg/day for 1990 …

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Adaptation Of Some Grass Species To Grazing, Marc Ghesquiere, J C. Emile, X Charrier, R Traineau Sep 2024

Adaptation Of Some Grass Species To Grazing, Marc Ghesquiere, J C. Emile, X Charrier, R Traineau

IGC Proceedings (1993-2023)

To examine the grazing behaviour of some grass species, 2 linked trials were set up in Lusignan (France), Dry matter yields of 10 species were recorded by frequent mechanical cuts (every 15 days) and compared with the ability to feed sheep under continuous grazing management. The dry matter yield of the genotypes ranged from 5600 to 8600 kg DM/ha and the grazing yield from 86 to 183 days x animal. The well-known species, such as Bromus siIchensis L., 8. caIhar1ic11s L. and Dactylis glomerata L. usually used in farms allowed high dry matter and grazing yields, but some secondary species …

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Quantification Of Nutrients Consumed And Utilized By Holstein Cows Grazing Grass Pastures In The North-Eastern Usa, Lisa A. Holden, L D. Muller, G A. Varga, S L. Fales Sep 2024

Quantification Of Nutrients Consumed And Utilized By Holstein Cows Grazing Grass Pastures In The North-Eastern Usa, Lisa A. Holden, L D. Muller, G A. Varga, S L. Fales

IGC Proceedings (1993-2023)

Managing the nutrition of high producing dairy cows on pasture in the north-eastern USA is challenging owing to difficulty in accurately estimating intake and In determining nutrient utilisation by grazing dairy cows. In Trial 1, 16 lactating Holstein cows were used to estimate intake with an intensively grazed orchardgrass (Dactylis glomerata L.) pasture with 2 stocking rates of 2.S and 3,9 cows/ha in a 24 week grazing season. Cows were fed a grain supplement which comprised about 35% of the diet dry matter. Chromium oxide was used as an external marker in faeces, Results of Trial 1 indicated total …

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Crop Processing And Fractionation As A Commercial Proposition To Forage-Based Animal Systems, H T. Ostrowski-Meissner Sep 2024

Crop Processing And Fractionation As A Commercial Proposition To Forage-Based Animal Systems, H T. Ostrowski-Meissner

IGC Proceedings (1993-2023)

The paper outlines crop processing and fractionation technology as it applies to an intensive forage-based operation with beef cattle, The benefits of forage processing prior to its feeding to cattle are described with an emphasis not only on the uniformity of the nutritive quality of the processed product but also on the extra financial benefits resulting from the wet fractionation process. The value-added primary products from the fractionation process ensure extra return to the. forage producers, crop processing installation and the feedlot operation. The characteristics of the fractionation products derived from lucerne and other crops are described.

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Integrated Grazing Of Goats With Sheep Or Cattle On Continuously Grazed Pasture, A M. Nicol, A.J F. Russel, I A. Wright Sep 2024

Integrated Grazing Of Goats With Sheep Or Cattle On Continuously Grazed Pasture, A M. Nicol, A.J F. Russel, I A. Wright

IGC Proceedings (1993-2023)

Oroups of ewes (10) and their twin lambs were grazed on sown ryegrass• white clover (Lolium perenne L.-Trifollum repens L.) pastures maintained at a sward surface height of 4 or 8 cm and a further group grazed with yearling goats (in a proportion of 1/3 ewe plus lamb live weight) also at fi cm. A second concurrent experiment consisted of 3 similar treatments using young cattle with sward surface heights of 8 and 12 cm. Results over the 140-day grazing period showed that allhough the diet selected by sheep and cattle grazed with goats contained more green grass …

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Herbage And Animal Production From Tall Fescue- And Ryegrass-Based Pastures In A Summer-Dry Environment, D E. Hume, R.J M. Hay, T B. Lyons Sep 2024

Herbage And Animal Production From Tall Fescue- And Ryegrass-Based Pastures In A Summer-Dry Environment, D E. Hume, R.J M. Hay, T B. Lyons

IGC Proceedings (1993-2023)

Herbage production and animal performance were measured over 3 years In Hawkes Bay, a summer-dry region of New Z'.ealand. Tall rescue (Festuca arundinacea) (3 cultivars, all endophyte free) was compared with high endophyte perennial ryegrass (Lolium perenne). All pastures were sown with white clover (Trifolium repens). Herbage production and composition were determined for all seasons while cattle were monitored for live-weight gains from spring through to autumn. Tall fescue pastures produced 27% more total dry matter/ year than the ryegrass pasture, primarily in autumn. In summer­autumn, ryegrass pastures had up to 76% dead matter …

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Pasture Production Of Annual, Hybrid And Perennial Ryegrasses In Cool And Warm Temperature Climates, D E. Hume, M J. Hickey Sep 2024

Pasture Production Of Annual, Hybrid And Perennial Ryegrasses In Cool And Warm Temperature Climates, D E. Hume, M J. Hickey

IGC Proceedings (1993-2023)

Pasture production and persistence of 8 ryegrass species-cultivars were evaluated under 2 grazing frequencies (infrequent and frequent) in a cool temperate climate (Southland) and a warm temperate climate (Manawatu) in New Zealand. All pastures were sown with white clover (Trifolirim repe11s) and rotationally grazed with sheep for 3 years. The 8 ryegrass lines were divided botanically into cultivars of annual ryegrass (Lo/ium muftljlorum), hybrid ryegrass (L. boucl1eanu111) (most of the parentage derived from L. multiflorum) and perennial ryegrass (L. pere,me). Infrequent grazing resulted in higher yields and particularly higher ryegrass yields, but lower ryegrass tiller numbers at the cool site. …

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Influence Of Sward Height On The Mechanics Of Grazing And Intake Rate By Racehorses, T P. Hughes, J R. Gallagher Sep 2024

Influence Of Sward Height On The Mechanics Of Grazing And Intake Rate By Racehorses, T P. Hughes, J R. Gallagher

IGC Proceedings (1993-2023)

Indoor studies were conducted with harvested turfs to evaluate the effect of sward height on the mechanics of grazing and Intake rate of racehorses. Bile weight increased from 0.64 g DM at the lowest sward height of 13.1 cm to 1.29 g DM at the highest sward height, 29,2 cm. Bite rate declined from 57.9 bites/min at the lowest sward height to 37.4 bites/min at the highest. This decline in bite rate as sward height Increased reflected increasing depth of bite, bite volume and bile weight. Intake rate did not increase with increasing sward height, It was concluded that this …

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Changes In Pasture Composition In Semi-Arid Environments Due To Soil Fertility, P C. Kerridge, J G. Mcivor Sep 2024

Changes In Pasture Composition In Semi-Arid Environments Due To Soil Fertility, P C. Kerridge, J G. Mcivor

IGC Proceedings (1993-2023)

The changes in the yield and botanical composition after the sowing of grass and legume species into cleared native woodland in 2 long­term grazing trials are presented and discussed. Soil fertility, rainfall and method of establishment all affected pasture composition. Increasing the soil fertility through phosphate application was necessary for sustained production of sown grass and also improved legume performance.

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Nitrogen Recovery Of Coastal Bermudagrass As Influenced By Sulphur Fertilization, J M. Phillips, W E. Sabbe Sep 2024

Nitrogen Recovery Of Coastal Bermudagrass As Influenced By Sulphur Fertilization, J M. Phillips, W E. Sabbe

IGC Proceedings (1993-2023)

Research was conducted during 2 growing seasons to determine N and S fertiliser recovery of Coastal bermudagrnss (Cynodon dactylon (L.) Pers.) on ft $-deficient Rilla silt loam (fine-silty, mixed, thcrmic Typic Hnpludalf) soil in the Gulf Coastal Plain of the south-eastern USA, S wns applied as gypsum or wettable S at the annual Initiation of fornge growth at 100 kg S/ha, N wu applied as ammonium nitrute (NH4NO3),_ urea, and 32% urea-ammonium nitrate (UAN) solution at rates of 0, 224, and 448 kg N/ha in 4 split applications. N sources did not significantly influence Nor S recovery. However, both …

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Climate Change: Adapting Tropical And Subtropical Grasslands, G M. Mckeon, S M. Howden, N.O J. Abel, J M. King Sep 2024

Climate Change: Adapting Tropical And Subtropical Grasslands, G M. Mckeon, S M. Howden, N.O J. Abel, J M. King

IGC Proceedings (1993-2023)

Climate change as a result of increasing greenhouse gas concentrations or lhe repetition of historical climale variability will affect the management and production of tropical and subtropical grasslands that support about half the world's domestic herbivores. Previous studies of the regional impact of climate change and climate variability on intensive agriculture have shown lhat such evaluation should include the known and expected abilities of managers and governments to respond by reducing the negative impacts and taking advantage of positive opportunities, A high priority for grassland scientists is the development of similar evaluation capabilities for grassland systems, which are more complex …

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Evaluating The Effects Of Climate Changes On Grasslands, Robert G. Woodmansee, William E. Riebsame Sep 2024

Evaluating The Effects Of Climate Changes On Grasslands, Robert G. Woodmansee, William E. Riebsame

IGC Proceedings (1993-2023)

Determining the effects of climate change on cold region grasslands requires the integration of knowledge from the biological, physical and social sciences. That integration is dependent on new methods, technologies and facilitation techniques ! that allow evaluation and management of complexity rather than focusing on simplification. Specifically, grassland response can be defined as the interaction of 10 basic sectors: (I) wenther and climate (Including chemical factors}, (2) winter, (3) soil properties, (4) assemblages of organisms, (5) energy, (6) economic viability, (7) individual human behavior, (8) cultural and community viability, (9) organisational penalty, and (10) political, legal, policy, and regulatory Influences. …

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