Buried Viable Seeds In The Alberta Foothills Under High Intensity Low Frequency Grazing And The Resemblance To Seed Rain,
2025
University of Alberta
Buried Viable Seeds In The Alberta Foothills Under High Intensity Low Frequency Grazing And The Resemblance To Seed Rain, R Lagroix-Mclean, Jane R. King
IGC Proceedings (1977-2023)
Sudies describing seed banks and seed rain on native rangelands are few in number although it is recognized that there is an abundance of viable seed within the soil (Rabinowitz, 1981; Johnston et al., 1969). The seed bank and seed rain represent an integral part of the potential for recruitment or regeneration of species into the sward (Rabinowitz, 1981). The role of seed banks in succession is yet to be completely understood. Field experiments were conducted to describe seed bank and seed rain on a Canadian native prairie and to evaluate the impact of high intensity low frequency grazing on …
The Structure Of The Grass/Clover Sward And Its Implications In Sward Management,
2025
AFRC
The Structure Of The Grass/Clover Sward And Its Implications In Sward Management, Alison Davies
IGC Proceedings (1977-2023)
In attempting to formulate management rules for perennial ryegrass/white clover pastures it is important to try to distinguish between changes in clover content which result from management, and those which result from the different responses of grass and clover to the changing environment. This paper discusses the similarities and differences between the response patterns of components of growth in grass and clover and attempts to show how the differences between the two species my be exploited to control the balance between them.
Effets Du Pietinement Des Bovins Sur Le Trefle Blanc Pur Ou En Association,
2025
INRA
Effets Du Pietinement Des Bovins Sur Le Trefle Blanc Pur Ou En Association, Francoise Vertes
IGC Proceedings (1977-2023)
Le pietinement des bovins en mauvaises conditions de portance, !ors du dernier paturage d'automne ou de la mise a l'herbe au printemps, etant le principal facteur de deterioration de la structure des sols (Lauden, 1986), nous en avons etudie Jes effets sur Jes plantes et Jes sols, a l'echelle stationnelle, en Bretagne. Une double demarche analytique et synthetique permet de quantifier a court et moyen terme Jes consequences directes et indirectes du pietinement (Morion,. 1983). Une premiere experimentation (1987) concerne un pietinement de printemps, plus ou moins intense; la deuxieme (1987-1988) integre Jes effets d'un pietinement d'hiver, cumule ou non …
Changes Under Sheep Grazing In The Species Composition Of Sown Pastures With Special Reference To White Clover,
2025
Academy of Agriculture
Changes Under Sheep Grazing In The Species Composition Of Sown Pastures With Special Reference To White Clover, J Gajda, M Warda, J Sawicki, Anna Kotakowska
IGC Proceedings (1977-2023)
White clover is a valuable component of pasture (Thomson, 1978). The level of nitrogen fertilization and the method of pasture utilization (Mackenzie, 1982), as well as habitat conditions (Lenoble, 1975) have a decided effect upon the persistence of this species in the sward. However, the stability of white clover in the sward is a complex problem and further studies are required. This paper records changes in the species composition of pasture sward caused by sheep grazing with special reference to white clover.
Variation With Season And Node Position In Carbohydrate Content Of White Clover Stolons,
2025
DSIR
Variation With Season And Node Position In Carbohydrate Content Of White Clover Stolons, M.J M. Hay, A.C P. Chu, M V. Knighton, S Wewala
IGC Proceedings (1977-2023)
Storage of carbohydrate in stolon of field-grown white clover (Trifolium repens L.) is important as up to 60 % of dry matter is in stolons and their carbohydrate content is high relative to roots (Harris et al., 1983). Previously no account has been taken of node position when the carbohydrate status of stolons has been assessed. Most field-grown white clover is clonal, with older nodes continually dying as new nodes are formed, hence the pattern of carbohydrate storage of individual nodes may differ. The objectives of this study were to determine the carbohydrate status of individual nodes at different …
Simulation Of The Effect Of Stolon Death Rates On Branching Structure Of White Clover Plants,
2025
DSIR
Simulation Of The Effect Of Stolon Death Rates On Branching Structure Of White Clover Plants, V J. Thomas, M.J M. Hay, P.C D. Newton
IGC Proceedings (1977-2023)
Simulation is a technique whose value is greatest in two areas. The first of these involves the discipline of examining the system being modelled, and, as a result, being forced to obtain accurate information on the parameters which significantly influence the system. The second area involves estimating the effect of changes in system parameters, and from this establishing which factors have substantial effects on the output variables considered. In the model of white clover growth considered here a considerable number of input parameters were used. These parameters were derived from data of variable reliability. In particular, the death rate data …
Grazing Management Effects On Perennial Ryegrass And White Clover Triller Populations,
2025
DSIR
Grazing Management Effects On Perennial Ryegrass And White Clover Triller Populations, W F. Hunt
IGC Proceedings (1977-2023)
Pasture grazing managements have clearly identifiable effects on plant morphology, density and species composition. Typically, swards grazed continuously by sheep have relatively high populations of relatively small perennial ryegrass tillers while rotationally grazed swards contain rather fewer large/ tillers (Chapman and Clark 1984, Suckling 1959, Mitchelle and Glenday 1958, Collet et al., 1981). Generally, more severe defoliations are associated with greater tiller densities (Davies 1977). Management induced increases in tiller populations of perennial pastures are possible because plants tiller freely when competition for light is reduced by herbage removal (Hunt and Field 1978). If left undisturbed, tiller density is finally …
Manipulating The Plastic Response Of White Clover Through Grazing, In A Cool, Temperate Climate In New Zealand, R.J M. Hay, G S. Baxter
IGC Proceedings (1977-2023)
In Southland, New Zealand, a wide range of grazing systems are practised, from continuous set-stocking to year round rotational grazing. A problem is the apparent decline in contribution of white clover (Trifolium repens L.) to total sward production in older pastures. Cereal and brassica crops, which depleted soil N, were traditionally sown each year and used to ensure that about 20 % of any farm consisted of clover-dominant two and three year old pastures. Carran (pers. comm.) suggests that all-grass-farming has removed the N-deficit incentive for clover growth. Farmlet trials at the Gore Regional Station, DSIR, have shown that …
Characteristics Of Individual White Clover Plants In Grazed Swards,
2025
DSIR
Characteristics Of Individual White Clover Plants In Grazed Swards, M J.M Hay, J L. Brock, V J. Thomas
IGC Proceedings (1977-2023)
Compared to the large volume of agronomic research on white clover (Trifolium repens L.), studies on the growth and morphology of individual plants constituting the population under grazing are few (Brock et al., 1988). Increased knowledge of the clonal growth and seasonal behaviour of individual white clover plants is seen as essential (Snaydon, 1985) if the mechanisms governing persistence and productivity in mixed grazed swards are to be understood. Seasonal growth patterns of white clover vary with environment (Jones, 1982) and this paper describes seasonal variation in some characteristics of individual white clover plants in grazed swards in a temperate …
The Influence Of Physical And Biochemical Characteristics Upon The Selection Of White Clover By Grazing Sheep,
2025
Massey University
The Influence Of Physical And Biochemical Characteristics Upon The Selection Of White Clover By Grazing Sheep, J Hodgson, D A. Clark, S Wewala
IGC Proceedings (1977-2023)
Observations have been made on the reactions of sheep to variations in leaf mark (Cahn and Harper, 1976) and cyanogenic glucoside concentration (Corkill, 1952) in white clover (Trifolium repens L.), but little is known about the relative importance of alternative visual and biochemical cues in selective behaviour under grazing conditions. This paper reports the results of two studies at DSIR Grasslands Division, Palmerston North, New Zealand on the reactions of grazing sheep to white clover plants exhibiting substantial genotypic variation in leaf size and colour, leaf mark, and cyanogenic glucoside potency.
Interactions Between Parent Stolons And Branches In Assimilate Partitioning In White Clover (Trifolium Repens L.),
2025
The University of Reading
Interactions Between Parent Stolons And Branches In Assimilate Partitioning In White Clover (Trifolium Repens L.), D F. Chapman, M J. Robson, R W. Snaydon
IGC Proceedings (1977-2023)
In temperate regions of the world, white clover (Trifolium repens L.) persists in permanent pastures by vegetative reproduction (Chapman 1987). Thus stolon branching is vital for the perennation of the species. There is, however, no information available on physiological relationships between branches and parent stolons, or on the degree of physiological integration of whole clover plants. Clover spreads laterally by stolon extension and in extremely heterogenous environments, like grazed pastures, parts of a single plant may encounter different levels of stress (defoliation, nutrient levels, shading). Physiological integration (eg. mutual exchange of carbohydrate between branches and parent stolon) may allow …
The Effect Of Accumulated Herbage Mass In Winter And Spring On White Clover Development,
2025
Queens University of Belfast
The Effect Of Accumulated Herbage Mass In Winter And Spring On White Clover Development, A S. Laidlaw, J A. Withers
IGC Proceedings (1977-2023)
Clover development in long term mixed swards is variable due to, among other factors, the complex interaction between grass and clover. A previous study has shown that grazing grass/clover swards with sheep for a short period during winter/spring may result in higher clover content and clover drymatter yield in summer than in swards ungrazed during winter/spring, while nitrogen fertilizer has the reverse effect (Laidlaw and Steward 1987). It was concluded that these treatments, by varying the amount of herbage accumulated in spring, controlled the amount of light passing to the base of the sward and so determined the rate of …
Towards Developing A Model Of Persistence And Production For White Clover,
2025
CSIRO
Towards Developing A Model Of Persistence And Production For White Clover, M J. Hill, K A. Archer, K J. Hutchinson
IGC Proceedings (1977-2023)
The development of a model which successfully simulates the response of white clover Trifolium repens L. to environmental variables affecting persistance would be of great value for defining critical limiting processes. In Australia, persistence is determined by the impact of climate, competition and grazing on the processes of generation, from seed or by stolons (Jones, 1980; Archer and Robinson, 1988). Here we outline a model of white clover persistence and production in eastern Australia. In Australia the four critical phases in the lifecycle of white clover where the environment can threaten persistence are : late autumn and winter when germination …
Some Factors Causing Temporal And Spatial Variation In White Clover Performance In Grazed Swards,
2025
Macaulay Land Use Research Institute
Some Factors Causing Temporal And Spatial Variation In White Clover Performance In Grazed Swards, S A. Grant, C A. Marriott
IGC Proceedings (1977-2023)
Stolon burial as a result of earthworm activity and poaching is common on many soil types in autumn and winter. The covering of soil is thought to protect against frost and thus benefit winter survival. On heavy soils in wet conditions treading can result in stolon burial during the growing season (Grant et al., 1988). The extent to which burial at this time adversely affects clover is unknown. Urination by grazing animals deposits the equivalent of 300-600 kg N/ha locally on the sward. Since the addition of fertiliser N to mixed grass-clover swards favours grass at the expense of clover, …
The Growth Of White Clover (Trifolium Repens L.) In Field Swards In Wales. A Review.,
2025
University College of Wales
The Growth Of White Clover (Trifolium Repens L.) In Field Swards In Wales. A Review., D Wilman
IGC Proceedings (1977-2023)
The purpose of the paper is to review some studies of white clover (Trifolium repens L.) growth in field swards in Wales, which were supervised by the author in the period 1976-88. White clover is a valuable species, from the point of view of both nitrogen fixation and animal nutrition, but it is used successfully on only a small proportion of farms in the United Kingdom. Studies such as those reviewed should contribute to greater success in white clover use.
Evaluation Of Mixed Pastures Including Trifolium Pratense Under Grazing,
2025
University of Kentucky
Evaluation Of Mixed Pastures Including Trifolium Pratense Under Grazing, L A. Romero
IGC Proceedings (1977-2023)
The feeding system for milk and beef production in the Central Region of Santa Fe province (Argentine) is based on semipermanent and seasonal pastures along with conserved forage. Generally, legumes and grasses mixtures are used, the more usual species being lucerne (Medicago sativa), red clover (Trifolium pratense), prairie grass (Bromus catharticus), and also chicory (Cichorium intibus). These mixtures produce high amount of dry matter (DM) with a high nutritive value and an useful life span of three to five years. The objective of this research was to evaluate three mixed pastures with red clover …
Regrowth Of The Components Of Two Legume/Grass Associations Following Grazing On Acid Soils Of The Eastern Plains Of Colombia, J Fischer, D Thomas
IGC Proceedings (1977-2023)
The low nutritive status of the neotropical savannas may be improved by using a forage legume, either to supplement the savanna, or as a component of a grass-legume pasture to replace it. The two stoloniferous legumes Arachis pintoi and Desmodium ovalifolium form promising associations with various species of Brachiaria (Grof, 1985; Thomas and Grof, 1986), but there are very few data on their reaction to grazing. The relation between growth rate and the amount of leaf material is central to understanding how systems of grazing management influence plant relations. Because the palatability of the two legumes above differ, under contrasting …
Effects Of Sheep Grazing On Dry Matter Production And Persistence Of A Lucerne Crop,
2025
Diputacion de Aragon
Effects Of Sheep Grazing On Dry Matter Production And Persistence Of A Lucerne Crop, I Delgado Enguita
IGC Proceedings (1977-2023)
In Spain, lucerne is mainly grown on irrigated areas for hay production and dehydration industry. The utilization of lucerne under grazing is very infrequent, due to the detrimental effects on both, animal health and plants persistence that have been attributed to it. However, lucerne dry matter (DM) production and quality in addition of being its cultivation more economical than grasses, offer interesting advantages to be used as a green forage (Delgado, 1984). New Zealand workers (Agronomy Society of New Zealand, 1982) have stressed that lucerne could be successfully managed under grazing when long resting periods were provided between short grazing …
The Survival Of Seed Of Subterranean Clover Following Ingestion By Sheep,
2025
University of Adelaide
The Survival Of Seed Of Subterranean Clover Following Ingestion By Sheep, C T. De Koning, E D. Carter
IGC Proceedings (1977-2023)
Shortage oflivestock feed is common in the summer-autumn period in the Mediterranean-type environment of southern Australia. There is a gradual decline of both quality and quantity of dry pasture residues and heavy grazing may severely deplete seed reserves. Carter (1981) showed how sheep progressively eliminated medic pods and seeds from hard-setting soil. Pastures based on subterranean clover (Trifolium subterraneum L.), hereafter referred to as sub clover, can also be severely depleted of seed reserves even though some seed is buried in the soil. While the survival of ingested seed has long been recognized as a means of spreading legumes …
Effect Of Regrowth Interval Upon Canopy Structure And Utilization Of Aeschynomene-Limpograss Pastures,
2025
University of Florida
Effect Of Regrowth Interval Upon Canopy Structure And Utilization Of Aeschynomene-Limpograss Pastures, J E. Moore, L E. Sollenberger, K A. Albrecht, P T. Beede, W F. Brown
IGC Proceedings (1977-2023)
During mid-summer through early autumn, limpograss ( Hemarthria altissima) herbage may have crude protein concentration below 7 %, and performance of growing cattle on limpograss pasture is often low (Sollenberger et al., 1988). Overseeding with Aeschynomene americana may improve for age intake and nutritive value. Deferred grazing of an aeschynomene-limpograss association has potential to provide high-quality forage into mid-autumn. Because grass and legume do not have similar growth rates, changes in canopy structure may occur during late season which influence forage utilization by grazing cattle. The objective was to compare plant canopy characteristics to diet composition and ingestive behavior of …
