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Articles 1 - 18 of 18
Full-Text Articles in Physical Sciences and Mathematics
Vegetation Changes In Sown Grassland In The Uk After Nine Years Of Extensive Grazing Management, C. A. Marriott, G. T. Barthram
Vegetation Changes In Sown Grassland In The Uk After Nine Years Of Extensive Grazing Management, C. A. Marriott, G. T. Barthram
IGC Proceedings (1997-2023)
The effect of extensive grazing management with sheep on vegetation change in sown pastures (initially containing Lolium perenne and Trifolium repens) in the uplands of Scotland was investigated from 1990-1999. One treatment was representative of current more intensive management systems; it was fertilized, and maintained at a sward surface height of 4 cm. Two treatments were unfertilized and were maintained at sward surface heights of 4 cm or 8 cm; the ewe numbers carried on these treatments averaged 74% and 44%, respectively, of those on the fertilized treatment. In all treatments the sheep were Scottish Blackface ewes. Their single …
The Influence Of Rising Atmospheric Co2 On Grassland Ecosystems, J. A. Morgan, P. C. D. Newton, J. Nösberger, C. E. Owensby
The Influence Of Rising Atmospheric Co2 On Grassland Ecosystems, J. A. Morgan, P. C. D. Newton, J. Nösberger, C. E. Owensby
IGC Proceedings (1997-2023)
Increasing atmospheric CO2 concentrations and climatic change will have significant effects on the ecology of grasslands. This paper evaluates results from four CO2 enrichment studies in contrasting grasslands. A Swiss study investigates the effects of elevated CO2 (600 μL L-1 CO2) on perennial ryegrass (Lolium perenne L.) and white clover (Trifolium repens L), a New Zealand study examines how elevated CO2 (475 μL L-1 CO2) affects a botanically diverse pasture, and studies in the Kansas tallgrass prairie and the Colorado shortgrass steppe investigate the effects of an approximate …
Management Of Meadow Fescue Pasture For High-Producing Dairy Cows In Northern Japan, K. Sudo, K. Ochiai, T. Ikeda
Management Of Meadow Fescue Pasture For High-Producing Dairy Cows In Northern Japan, K. Sudo, K. Ochiai, T. Ikeda
IGC Proceedings (1997-2023)
The objective of this study was to establish an intensive grazing system of meadow fescue (Festuca elatior L.) pasture for high-producing dairy cows in some areas of Japan where soil freezes in winter. Plant succession of meadow fescue pastures that had been grazed at different plant heights and milk production from cows grazed on meadow fescue pasture compared to that from cows grazed on perennial ryegrass pasture were surveyed over a five year period. Succession of meadow fescue pasture depended on the management of plant height before grazing use. Milk production from cows grazed on meadow fescue pasture was …
The Effect Of Perennial Ryegrass Cultivar Lock Up Length And Nitrogen On Forage Quality For Silage, Joseph L. Jacobs, Frank R. Mckenzie, G. N. Ward
The Effect Of Perennial Ryegrass Cultivar Lock Up Length And Nitrogen On Forage Quality For Silage, Joseph L. Jacobs, Frank R. Mckenzie, G. N. Ward
IGC Proceedings (1997-2023)
A study was undertaken to determine the effects of three perennial ryegrass (Lolium perenne L.) cultivars (Vedette, Impact and Nevis) with differing maturities, lock up length and nitrogen (N) application upon the dry matter (DM) yield and nutritive characteristics of pasture for silage. The addition of N at 50 kgN/ha significantly (P< 0.05) increased DM yield for all cultivars. Metabolisable energy (ME) (MJ/kgDM) of the ryegrass declined with time for all treatments, although by week 8 of lock up the ME content of Vedette was significantly (P< 0.05) lower than for other cultivars. When the DM yield and ME content of ryegrass at early ear emergence for each cultivar was compared, the harvestable metabolisable energy (MJ/ha) was highest for Nevis followed by Impact and Vedette. In conclusion, there is potential to use later maturing cultivars of ryegrass in south east Australia to allow for later harvesting of forage for silage, whilst maintaining ME and maximising DM yields. Furthermore the use of N fertiliser can also increase DM yields without impinging on pasture quality.
Nitrogen Fertiliser Effects On Perennial Ryegrass Nutritive And Nitrate Content During The Cool Season, Joseph L. Jacobs, Frank R. Mckenzie
Nitrogen Fertiliser Effects On Perennial Ryegrass Nutritive And Nitrate Content During The Cool Season, Joseph L. Jacobs, Frank R. Mckenzie
IGC Proceedings (1997-2023)
A study was undertaken to determine the effects of differing levels of nitrogen (N) application (0 (N1), 25 (N2), 50 (N3) and 75 kgN/ha (N4)) during late autumn (T1), early (T2) and late winter (T3) on the nutritive characteristics and nitrate content of perennial ryegrass. Changes in crude protein (CP) for all treatments at each application time were similar irrespective of level of N application. At the commencement of all treatments, the existing CP content was highest in N3, followed by N2, N1 and N0. Nitrate content decreased throughout T1 primarily due to dry conditions, whilst during T2, levels for …
Nitrogen Response Efficiencies From Grazed Dairy Pastures Under Dry Conditions, Frank R. Mckenzie, Joseph L. Jacobs
Nitrogen Response Efficiencies From Grazed Dairy Pastures Under Dry Conditions, Frank R. Mckenzie, Joseph L. Jacobs
IGC Proceedings (1997-2023)
Experiments were conducted within a long-term nitrogen (N) fertiliser experiment under grazing. The objective was to examine N response efficiencies (kg dry matter (DM)/kg N) and herbage crude protein (CP) content to fertiliser N applied under dry soil conditions (gravimetric soil moisture content of 17% at 10cm; soil field capacity = 38% and wilting point = 11%) during autumn (April 1999) and late spring (November 1999) in southeastern Australia. Visually, N treated plots were greener in colour than control (no N) plots. No differences were recorded in primary or residual DM yields, N response efficiencies, and pasture growth rates between …
Seasonal Growth Curves Of Perennial Ryegrass In Mexico, M. E. Z. Velasco, Alfonso Hernández-Garay, J. P. Pérez, V. A. González-Hernández
Seasonal Growth Curves Of Perennial Ryegrass In Mexico, M. E. Z. Velasco, Alfonso Hernández-Garay, J. P. Pérez, V. A. González-Hernández
IGC Proceedings (1997-2023)
An experiment was established at Colegio de Postgraduados Research Station, Texcoco, México to evaluate the seasonal pattern of growth curve of perennial ryegrass (Lolium perenne) swards. Growth rate increases rapidly from a low level immediately after defoliation, and eventually reaches an equilibrium level as the amount of green leaf in the sward stabilize. The time required to reach this state varied according to the season of year, with the four seasons ranked in the order: spring (4 weeks) < summer (5 weeks) < autumn and winter (6 weeks). Once swards reached equilibrium, growth rates started to decline as a consequence of an increase in dead material and pseudostem. These increases were highest in spring and lowest in winter. The results of this study suggest that sward management to maximise herbage production and utilisation in ryegrass swards must be done once the highest green leaf mass is reached. In this trial, it was reached at 5, 6, 6 and 4 weeks in summer, autumn, winter and spring, respectively.
Nonstructural Carbohydrate Reserves Of Temperate Perennial Grasses In Autumn Early Growth, Y. Tamura, K. Matoba, A. Fushimi, M. Moriyama
Nonstructural Carbohydrate Reserves Of Temperate Perennial Grasses In Autumn Early Growth, Y. Tamura, K. Matoba, A. Fushimi, M. Moriyama
IGC Proceedings (1997-2023)
The objective of this study was to determine levels of nonstructural carbohydrate reserves of four temperate perennial grasses: Orchardgrass (Dactylis glomerata L.), Timothy (Phleum pratense L.), Perennial ryegrass (Lolium perenne L.), and Reed canarygrass (Phalaris arundinacea L.) in their early growth stages during the cool autumn temperatures in northern Japan. At the time of sampling, all grasses were in their vegetative stage, and Reed canarygrass was not forming rhizomes. Fructosan concentration in reed canarygrass roots (8.04%) was 22 times that of the leaf blade (0.36%) and twice that of the stem (3.40%); the concentration in reed …
Herbage Seed Production Possibilities In Finland, O. Niemeläinen, M. Kinnari
Herbage Seed Production Possibilities In Finland, O. Niemeläinen, M. Kinnari
IGC Proceedings (1997-2023)
In the seed production variety experiments in Finland from 1977 to 1992 the mean seed yield of timothy (Phleum pratense) cultivar Alma was 717 kg ha-1, of meadow fescue (Festuca pratensis) cv. Boris 622 kg ha-1, of tall fescue (Festuca arundinacea) cv. Retu 350 kg ha-1, of perennial ryegrass (Lolium perenne) cv. Riikka, of cocksfoot (Dactylis glomerata) cv. Haka 295 kg ha-1, and red clover (Trifolium pratense) cv. Hankkijan Venla 403 kg ha-1. From 1988 to 1998 annual …
Effect Of Fungicide Application On Seed Yield Of Perennial Ryegrass, Piotr Goliński
Effect Of Fungicide Application On Seed Yield Of Perennial Ryegrass, Piotr Goliński
IGC Proceedings (1997-2023)
In four plot experiments established according to random blocks, application effectiveness of propiconazol + carbendazim (Tilt), propiconazol + fenpropimorph (Archer), flusilazol + carbendazim (Alert) and epoxiconazol + crezoxim-metil (Juwel) pesticides regarding the infection by fungal diseases of plant inflorescence structure, biological floret site utilisation, thousand seed weight and harvested seed yield of perennial ryegrass cv. Anna (2n) and cv. Maja (4n) was analysed. The Archer preparation was found to be the most effective, both in the case of Anna and Maja cultivars. Its application was found to increase seed yield in Anna and Maja cultivars by, respectively, 21,5% and 14,5%. …
Identification Of Perennial Ryegrass Varieties By Ultrathin‐Layer Isoelectric Focusing (Utlief) Of Seed Storage Protein, Minxuan Liu, Yunwen Wang, Jianguo Han
Identification Of Perennial Ryegrass Varieties By Ultrathin‐Layer Isoelectric Focusing (Utlief) Of Seed Storage Protein, Minxuan Liu, Yunwen Wang, Jianguo Han
IGC Proceedings (1997-2023)
No abstract provided.
Amino Acid And Protein Incorporation In Water‐Stressed Perennial Ryegrass, W. J. Jung, B. R. Lee, L. S. Li, Y. L. Jin, T. H. Kim
Amino Acid And Protein Incorporation In Water‐Stressed Perennial Ryegrass, W. J. Jung, B. R. Lee, L. S. Li, Y. L. Jin, T. H. Kim
IGC Proceedings (1997-2023)
No abstract provided.
Effect Of Genotype And Cutting System On Agronomic And Feed Quality Characteristics Of Perennial Ryegrass (Lolium Perenne L.) Grown In Three Sites In Northern Germany, H. Salama, M. Lösche, Antje Herrmann, M. Gierus, Friedhelm Taube
Effect Of Genotype And Cutting System On Agronomic And Feed Quality Characteristics Of Perennial Ryegrass (Lolium Perenne L.) Grown In Three Sites In Northern Germany, H. Salama, M. Lösche, Antje Herrmann, M. Gierus, Friedhelm Taube
IGC Proceedings (1997-2023)
No abstract provided.
Milk C18 :1 And Conjugated Linoleic Acid Isomers From Cows Grazed On Perennial Ryegrass, Tall Fescue Or Timothy Grass Swards, Michael R. F. Lee, E. J. Kim, N. Ellis, J. K. S. Tweed, Nigel D. Scollan
Milk C18 :1 And Conjugated Linoleic Acid Isomers From Cows Grazed On Perennial Ryegrass, Tall Fescue Or Timothy Grass Swards, Michael R. F. Lee, E. J. Kim, N. Ellis, J. K. S. Tweed, Nigel D. Scollan
IGC Proceedings (1997-2023)
No abstract provided.
Milk C18 Polyunsaturated Fatty Acids From Cows Grazed On Perennial Ryegrass, Tall Fescue Or Timothy Grass Swards, Michael R. F. Lee, E. J. Kim, N. Ellis, J. K. S. Tweed, Nigel D. Scollan
Milk C18 Polyunsaturated Fatty Acids From Cows Grazed On Perennial Ryegrass, Tall Fescue Or Timothy Grass Swards, Michael R. F. Lee, E. J. Kim, N. Ellis, J. K. S. Tweed, Nigel D. Scollan
IGC Proceedings (1997-2023)
No abstract provided.
Effect Of Different Explants On Callus Induction And Differentiation Of Perennial Ryegrass, Ru Yang, Qinghua Yuan
Effect Of Different Explants On Callus Induction And Differentiation Of Perennial Ryegrass, Ru Yang, Qinghua Yuan
IGC Proceedings (1997-2023)
No abstract provided.
Silencing Ga20‐Oxidase Gene By Rnai For Breeding Dwarf Perennial Ryegrass, Xinrong Ma, Xin Tan, Xiaoya Sun
Silencing Ga20‐Oxidase Gene By Rnai For Breeding Dwarf Perennial Ryegrass, Xinrong Ma, Xin Tan, Xiaoya Sun
IGC Proceedings (1997-2023)
No abstract provided.
Study On Winter‐Green Technology For Sports Field Turf In Tropic And Subtropic Region Of China, J. B. Xi, Y. Li
Study On Winter‐Green Technology For Sports Field Turf In Tropic And Subtropic Region Of China, J. B. Xi, Y. Li
IGC Proceedings (1997-2023)
No abstract provided.