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Full-Text Articles in Plant Pathology
Sward Height In Grazing Management: Vertical Profiles In Forage Quality, J E. Johnston, A Singh, E A. Clark
Sward Height In Grazing Management: Vertical Profiles In Forage Quality, J E. Johnston, A Singh, E A. Clark
IGC Proceedings (1977-2023)
Vertical and temporal trends in herbage yield and quality were assessed in a study sown in 1989 near Elora, Ontario. In a replicated field trial with 0.1 ha paddocks, Hereford heifers rotationally grazed 2 swards to each of 2 residual grazing heights, namely, SO and 100 mm, with a requisite 200-2S0 mm entry height. Profiles in yield and in in vitro organic mailer digestibility (IVOMD) were developed from 6, 1500 cm2 quadrats per paddock, which were subjected to vertically stratified clipping, using sheep shears with a vacuum attachment. In 1990, obliging entry. at 200-2S0 mm stabilised herbage organic matter on …
Sward Height In Grazing Management: Species Adaptation, A Singh, J E. Johnston, E A. Clark
Sward Height In Grazing Management: Species Adaptation, A Singh, J E. Johnston, E A. Clark
IGC Proceedings (1977-2023)
Under continental, northern conditions, yield potential of species such as perennial ryegrass (Loli11111 pere,me L.) and white clover (Trifolium repe,is L.) is considered to be inferior to that of taller, coarser species such as orchardgrass, bromegrass, timothy and alfalfa. However, recent species evaluation bas stressed management regimes characteristic of conserved feed rather than pasture production, In a replicated trial, species performance and persistence in mixture were evaluated in response to sward height-based grazing management. Starling in 1990, 2 swards constructed predominantly of fine- or coarse-stemmed grasses were grazed rotationally by cattle, using a common 20-25 cm entry height and a …
Effects Of Grazing Management On Grass Tiller Density Characteristics Of Ryegrass-White Clover Dairy Pasture, E R. Thom, A M. Bryant
Effects Of Grazing Management On Grass Tiller Density Characteristics Of Ryegrass-White Clover Dairy Pasture, E R. Thom, A M. Bryant
IGC Proceedings (1977-2023)
The characteristics of pastures receiving different systems of grazing management during September-May were examined over 3 years from September 1989. Three farmlets (each 10 0.8-ha areas) represented (i) rotational grazing every 30 days (September-May) (RG), (ii) fast rotations during spring (September-November) (SFR) and (iii) fast rotations during spring, summer and autumn (SeptemberMay) (SSFR). Pastures were predominantly perennial ryegrass (Lolium perenne L.) and white clover (Trlfolium repens L.) grazed by dairy cows. Large increases in grass tiller density occurred in SFR and SSFR areas after the first year compared with the rotationally grazed pastures, which have been maintained throughout …
Pasture Productivity Of Different Species Evaluated Under Grazing In The Central Valley Of Chile, Patricio Soto, E Jahn, H Acuna, C Ovalle
Pasture Productivity Of Different Species Evaluated Under Grazing In The Central Valley Of Chile, Patricio Soto, E Jahn, H Acuna, C Ovalle
IGC Proceedings (1977-2023)
Seven irrigated mixtures growing on volcanic ash soil were evaluated during 8 years. Five mixtures of white clover (Trifolium repens) (WC) with: ( I) ryegrass (Lolium perenne) (WC-R), (2) fescue (Festuca arundinacea) (WC-F), (3) orchardgrass (Dacrylis glomerara) (WCO), (4) orchardgrass-ryegrass (WC-O-R), (S) red clover-ryegrass (Trifolilun pratense) (WC-RC-R), (6) lucerne alone (Medicago saliva) (L), and lucerne-orchardgrass (L-0). Plots were 300 m2 in a complete block design with 3 replicates, grazed individually according to growth at 1S0-200 mm height for treatments with WC and 10% bloom for L. Pasture availability and ungrazed …
Influence Of Spring Grazing Management On Summer Autumn Production Of Dairy Pastures, S C. Da Silva, C Matthew, P.N P. Matthews, J Hodgson
Influence Of Spring Grazing Management On Summer Autumn Production Of Dairy Pastures, S C. Da Silva, C Matthew, P.N P. Matthews, J Hodgson
IGC Proceedings (1977-2023)
Three grazing treatments were allocated at random within e11ch of five 2.6 ha paddocks of perennial ryegrass (Lolium perenne L.) and white clover (Trifolium repens L.) pasture. The treatments involved variation i'n the timing and degree of control of ryegrass reproductive growlh in two successive pasture growth seasons (1990-91 and 1991- 92). In 1990-91, swards in which reproductive growth was controlled at anthesis (20 November; LHC) produced 4330 kg OM/ha between 18 December and 11 April, compared with 3980 kg DM/ha for swards controlled on 18 December (VLHC) and 3210 kg OM/ha for swards controlled on 9 October …
Effect Of Grass-White Clover Mixtures On Steer Performance And Sward Characteristics In Atlantic Canada, H T. Kunelius, P Narasimhalu
Effect Of Grass-White Clover Mixtures On Steer Performance And Sward Characteristics In Atlantic Canada, H T. Kunelius, P Narasimhalu
IGC Proceedings (1977-2023)
Pasture production in winter cold regions such as Atlantic Canada is limited by the availability of winter hardy and productive grass and legume species, Perennial ryegrass (Lolium perenne L.), meadow fescue (Festuca prarensis Huds.) and timothy (Phleum pratense L.) grown in binary mixtures with white clover (Trifolium repens L.), and naturalised pasture consisting of Poa spp., Agrostis spp. and white clover, were compared under grazing, Steers were used to graze the swards from 16-26 cm down to 8 or 11 cm post-grazing surface heights, Dry matter intake was higher for natural pasture than for sown pastures, …
Diet Selection By Lambs In Ryegrass-White Clover Swards Differing In The Horizontal Distribution Of Clover, R H. Armstrong, E Robertson, C S. Lamb, I J. Gordon, D A. Elston
Diet Selection By Lambs In Ryegrass-White Clover Swards Differing In The Horizontal Distribution Of Clover, R H. Armstrong, E Robertson, C S. Lamb, I J. Gordon, D A. Elston
IGC Proceedings (1977-2023)
Weaned 5-month-old lambs grazed 2 series of perennial ryegrass (Lolium perenne L.) plots containing patches of mixed perennial ryegrass and white clover (Trifolium repens L.) varying in either a) the size of patches or b) the distance between patches. Both series embraced the same range of percentages (1-25) of ryegrass-clover patches in each plot. Diet composition was estimated from the pattern of naturAI alkanes in faeces collected between days 6 to 15 after allocation of the lambs to the treatments. The percentage of clover in the diet declined markedly from days 6 to 11 and thereafter increased slightly. Dietary …
Comparison Of The Grazing Habits Of Japanese Black And Holstein Steers On Semi-Natural And Improved Pastures In Japan, Akihisa Yamada, Hiroshi Dohi, Shigeki Entsu
Comparison Of The Grazing Habits Of Japanese Black And Holstein Steers On Semi-Natural And Improved Pastures In Japan, Akihisa Yamada, Hiroshi Dohi, Shigeki Entsu
IGC Proceedings (1977-2023)
The grazing habit of 6 Japanese Black and 6 Holstein steers was compared on semi-natural pasture and improved perennial ryegrasswhite clover (Lolium perenne-Trifolium repens pasture in Japan. Japanese Black steers spent less time eating than Holstein steers on improved pasture. The ratio of walking while eating to total walking distance was lower for Japanese Blacks than for Holsteins, On the semi-natural pasture, Japanese Blacks .spent more time grazing than Holsteins and Japanese Blacks walked faster than Holsteins. On seminatural pasture, Japanese Blacks picked upper leaves always walking forward.
Sustainable Clover-Dominant Swards For Lamb Production Under Low Temperatures, J E. Vipond, G Swift, T H. Mcclelland
Sustainable Clover-Dominant Swards For Lamb Production Under Low Temperatures, J E. Vipond, G Swift, T H. Mcclelland
IGC Proceedings (1977-2023)
ABSTRACT Upland pastures for sheep and beef cattle in the UK typically contain less than 5% clover in the grazed herbage, Use of fertiliser N, low P and K status, low pH and inappropriate choice of grass and clover varieties are implicated in this low pasture clover content, along with temperature constraints. In a 4-year study, swards of tecraploid perenn ial ryegrass (Lolium perenne, cv. Condesa) were compared with swards of a diploid perennial rye grass (cv. Contender) both being maintained at a constant grazing height of 4-6 cm and given 160 kg N/ha/year. Lamb output (kg/ ha) from …
Relative Productivity And Persistense Of White Clover Cultivars Under Cutting Or Continuous Stocking By Sheep, D A. Davies, M Fothergill
Relative Productivity And Persistense Of White Clover Cultivars Under Cutting Or Continuous Stocking By Sheep, D A. Davies, M Fothergill
IGC Proceedings (1977-2023)
Perennial ryegrass-white clover (Lolium perenne-Trlfollium repens) swards of 3 clover cultivars were studied at a lowland (30 m) and upland (340 m) site in mid Wales over 3 years (1989-91). Lamb production from small-leaved Aberystwyth S 184 at 1021 kg/ha was 25% and 1191, more than from small-leaved Ac3351 and medium-leaved Grasslands Huia respectively. The relative lamb output from Huia was poorer at the upland location. Clover production, survival and morphology under a number of cutting heights and frequencies were different from those in the continuously stocked pastures. Cutting every 10 days at 2-3 cm resulted in poor clover and …
Morphological Changes In Three Clover (Trifolium Repens L.) Cultivars Under Continuous Stocking, M Fothergill, D A. Davies
Morphological Changes In Three Clover (Trifolium Repens L.) Cultivars Under Continuous Stocking, M Fothergill, D A. Davies
IGC Proceedings (1977-2023)
Individual plant morphology of 3 white clover (Trifolium repens L.) cultivars was studied during 1990 and 1991. Seasonal shifts were demonstrated by all cultivars towards a higher proportion of less complex plants from winter to mid summer. Over the latter half of the year the population tended lo return towards its original distribution. Seasonal fluctuations in stolon dry weight/plant and root number/plant were also identified, with the small-leaved Ac3351 maintaining a greater stolon OW/plant than Aberystwyth S184 and Grasslands Huia during 1990. Ac3351 and S184 also maintained a larger root number/plant over this period. However, no significant differences were detected …
Phytochrome Control Of Assimilate Partitioning In White Clover, Ch Robin, C Varlet-Grancher, F Gastal, A Guckert
Phytochrome Control Of Assimilate Partitioning In White Clover, Ch Robin, C Varlet-Grancher, F Gastal, A Guckert
IGC Proceedings (1977-2023)
Experiments were conducted in controlled conditions to examine the influences of phytochrome on assimilate partitioning between stolons and branches and to determine the effects on plant moq>hogcncsis in white clover (Trifolium repens L.). Far-red (FR) irradiated plants partitioned more 14C-assimilates to petioles of both the main stolon and branches and less to the nodulated COOis than did control plants. Results clearly demonstrated that FR-irradiated plants developed longer petioles and long internodes. Moreover, the branching rate decreased, which induced a lower portion of dry weight allocated to branches. However, the sink strength of the branches which were developing remained …
Influence Of Rooting On Stolon Branching In White Clover, M Jones, N R. Sackville Hamilton
Influence Of Rooting On Stolon Branching In White Clover, M Jones, N R. Sackville Hamilton
IGC Proceedings (1977-2023)
The relationship between rooting and branching in stolons of white clover (Trifolium repens L.) was investigated in a field experiment, Half of a group of stolons was allowed to develop roots naturally, while for the other half root establishment was prevented by severing young roots before they made contact with the soil. Prevention of root establishment did not affect the numbers of branches which developed on nodes produced during the experiment, and it stimulated of branching on nodes which were already present. This result was unexpected on the basis of earlier observations of stolon growth and suggests that the …
Inherent And Realized Potential Of Axillary Buds Of White Clover In Field Populations, P.C D. Newton, M.J M. Hay
Inherent And Realized Potential Of Axillary Buds Of White Clover In Field Populations, P.C D. Newton, M.J M. Hay
IGC Proceedings (1977-2023)
Fewer than 10% of while clover (Trifolium repens L.) axillary buds form established branches in grazed swards. In order to understand the mechanisms controlling his large loss of growth potential we have charted the potential fates a bud may meet. Each step in this flow chart offers the possibility for a loss of branching potential. We consider the factors that may be important in determining the fates of buds and highlight in particular the heavy losses of viable buds at a young age and propose that different factors may control branch initiation and branch establishment.
Screening Trifolium Repens L. And T. Pratense L. Germplasm For Resistance To Cylindrocladium Crotalariae (Loos) Bell & Sobers, D S. Wofford, K H. Quesenberry
Screening Trifolium Repens L. And T. Pratense L. Germplasm For Resistance To Cylindrocladium Crotalariae (Loos) Bell & Sobers, D S. Wofford, K H. Quesenberry
IGC Proceedings (1977-2023)
Using a greenhouse screening technique, 200 plant introduction Jines of white clover (Trifolium repens L.) and red clover (T. pratense L.) germplasm were evaluated for resistance to cylindrocladium root rot incited by Cyl/11drocladium crotalariae (Loos) Bell & Sobers. In general, white clover germplasm had much higher levels of resistance than red clover. Over 60% of white clover introductions had 30% or greater resistance to cylindrocladium root rot, with 21 % of the lines possessing more than 40% resistant plants. No relationship was found between level of resistance and geographic origin for white clover. Red clover was more susceptible to …
Effect Of Management And Cultivar On Nodal Root Development Of White Clover, J R. Caradus, D F. Chapman, R A. Skipp
Effect Of Management And Cultivar On Nodal Root Development Of White Clover, J R. Caradus, D F. Chapman, R A. Skipp
IGC Proceedings (1977-2023)
Nodal root development of white clover (Trifolium repens L.) swards was monitored by harvesting marked nodes from late autumn to spring and by taking tiller plugs over 15 months. At a hill country site Grasslands Huia and a large-leaved French eultivar, Crau, had greater nodal root development, in terms of root length, than a smallleaved hill country ecotype. Compadson of the effects of rotational sheep and cattle grazing at both lowland and hill country sites showed greater nodal root development root length and lateral root production under cattle grazing. Percentage of nodes with roots was greater under rotational than set-stocked …
Physiological Response Of White Clover Genotypes To Water Deficit, D J. Barker, J R. Caradus, M T. Mcmanus
Physiological Response Of White Clover Genotypes To Water Deficit, D J. Barker, J R. Caradus, M T. Mcmanus
IGC Proceedings (1977-2023)
Three plants from each of 2 white clover (Trifolium repens L.) cultivars, Grasslands Kopu and a breeding line selected from germplasm of Syrian origin, were grown in large pots of soil and physiological characteristics measured during a continuous drying phase of 18-37 days. By the end of the experiment, leaf water potential was -2.5 MPa, gravimetric soil water content was 13% (considerably lower than -1.5 MPa), and leaf relative water content was 60%. A 91- fold increase in leaf praline concentration indicated that water stress had altered plant metabolism. Differences in the rate of soil drying occurred between eultivars, but …
A Search For Persistent Perennial Legumes For Temperate Australia, M J. Hill, C Mulcahy, G Rapp
A Search For Persistent Perennial Legumes For Temperate Australia, M J. Hill, C Mulcahy, G Rapp
IGC Proceedings (1977-2023)
Problems with persistence of white clover (Trifolium repens L.) in extensive pastures of the high rainfall zone in eastern Australia necessitate the use of a wider range of perennial legumes. A range of species have been evaluated in nurseries and in regional on-farm trials on the northern Tablelands of New South Wales. Caucasian clover and I.oms spp. have proven most successful so far. Caucasian clover has been more productive than white clover at 2 sites in spring 1991 and autumn 1992, Hexaploid Caucasian clover has been subjected to the first of 3 cycles of recurrent selection for seedling vigour. …
Impact Of White Clover Cultivars On Nitrogen Fixation And Livestock Production In New Zealand Hill Pasture, D F. Chapman, A D. Mackay, B P. Devantier, N Dymock
Impact Of White Clover Cultivars On Nitrogen Fixation And Livestock Production In New Zealand Hill Pasture, D F. Chapman, A D. Mackay, B P. Devantier, N Dymock
IGC Proceedings (1977-2023)
Growth, nitrogen fixation and animal production of pastures based on the white clover (Trifolium repens L.) cultivars Grasslands Tabora or Grasslands Huia, and of unamended pastures containing the "resident" clover ecotype, were compared In a self-contained systems experiment on moderate to steep, low-fertility hill country. Put-andtake stocking of hoggets was used to assess animal production, with stocking rate determined by a feed budget model. Tabora- and Huiabased pastures had higher white clover contents than resident pastures over the first 3 years of measurement, and Tabora-based pastures fixed 4591, more N than resident pastures over 1 full year. Benefits in …
Breeding White Clover For Increased Persistence And Winter Growth, C K. Lee, K.F M. Reed, P J. Cunningham, J G. Rowe
Breeding White Clover For Increased Persistence And Winter Growth, C K. Lee, K.F M. Reed, P J. Cunningham, J G. Rowe
IGC Proceedings (1977-2023)
A programme to breed white clover (Trifolium repens L.) for increased persistence, yield and winter growth in the Australian environment is discussed. A collection of Australian ecotypes ls being used as the population base, Two projects are discussed: selection within the population of ecotypes and hybridisation of the Australian cv. Irrigation with the winter-active cv. Tamar. Plants from the ecotype population with superior yield and stolon density were identified, Controlled pollination among these selected plants produced half-sib families and their performance in 3 contrasting environments is discussed.
Progress In White Clover Agronomic Performance Through Breeding, J R. Caradus
Progress In White Clover Agronomic Performance Through Breeding, J R. Caradus
IGC Proceedings (1977-2023)
White clover (Trifolium repens L.) domestication began in the 16th century in Europe. However, it was not until the early 1920s that broad • agronomic groups were recognised, and not until the early 1930s that selections for improved agronomic performance were made within major ecotypes. Since then more than ·230 cullivars and commercial ecotypes have been developed. Data from 4 trials, 2 from Czechoslovakia, l from New Zealand and I from South Africa, were used io determine whether breeding since the 1930s had significantly improved in white clover performance. Cultivars were coded by decade in which they were developed …
Effect Of Method And Intensity Of Selection For Yield In White Clover, J R. Caradus, W M. Williams
Effect Of Method And Intensity Of Selection For Yield In White Clover, J R. Caradus, W M. Williams
IGC Proceedings (1977-2023)
The effectiveness of various strategies of selection for yield was tested using high performing white clover (Trifolium repens L.) lines derived from crosses between elite Grasslands Huia genotypes and elite genotypes from introduced germpiasm. There appeared to be no clear advantage of selecting genotypes, at the same intensity of selection, in the top 12.5% of families compared with the top 50% of families, There was a weak trend towards higher yielding progeny with increasing selection intensity. It was more effective to use individual selection within families based on performance rather than family selection, However, this effect was specific to …
Problems, Potentialities And Progress In White Clover Breeding, I Rhodes, K J. Webb, D R. Evans, R P. Collins
Problems, Potentialities And Progress In White Clover Breeding, I Rhodes, K J. Webb, D R. Evans, R P. Collins
IGC Proceedings (1977-2023)
The paper outlines the problems associated with the use of white clover (Trifolium repens L.) in northern Europe and describes the potential for, and progress in, overcoming these problems through genecic improvement. Special emphasis is placed on progress in breeding for tolerance to climatic stresses, particularly high and low temperacure and water stress which also provides options for coping with future climate change. Breeding for response to environmental and biotic factors has improved general compatibility and produced varieties with increased flexibility in grazing tolerance. Such tolerance has been achieved by changing plant morphology and also by utilising greater …
White Clover To Improve Natural Grasslands In Southern Brazil, N R. Paim
White Clover To Improve Natural Grasslands In Southern Brazil, N R. Paim
IGC Proceedings (1977-2023)
Nine white clover (Trifolium repens L.) cultivars, among them 2 bred in Rio Grande do Sul, were evaluated in association with annuai ryegrass and pensacola bahiagrass. In a plot experiment, during 4 years, 17 harvests were cut to determine lhe dry matter (DM) yield of the mixture components. The annual ryegrass produced in· the first year 1634 kg/ha OM and in the second year, by natural reseeding, only 120 kg/ha. The pensacola bahiagrass increased DM yield from 954 kg/ha in the second year to 4588 kg/ha in the fourth year without any nitrogen (N) fertilisation. The while clover …
Grasslands Prestige (G39), A White Clover Cultivar Originating From Northern New Zealand, B M. Cooper, D F. Chapman
Grasslands Prestige (G39), A White Clover Cultivar Originating From Northern New Zealand, B M. Cooper, D F. Chapman
IGC Proceedings (1977-2023)
G39 white clover (Trifolium repens L.) is a cultivar of similar leaf size to Grasslands Huia, but with characteristically greater stolon numbers per unit area of pasture, It was bred for sheep-grazing systems from clover ecolypes collected and evaluated in northern New Zealand. Twelve parent plants tolerant of stem nematode (Ditylenchus dipsaci) and leaf diseases, with better productivity than Huia, were selected. G39 was evaluated in Northland and at sites elsewhere in New Zealand, G39 produced more clover dry matter (DM) than Huia under rotational sheep grazing in Northland. At a hill country site in the southern North· …
Effect Of Excreta On Stolon Development Of White Clover Under Continuous Cattle Grazing, M I. Rebuffo, R Snaydon, J Morrison
Effect Of Excreta On Stolon Development Of White Clover Under Continuous Cattle Grazing, M I. Rebuffo, R Snaydon, J Morrison
IGC Proceedings (1977-2023)
The effects of cattle excreta on white clover growth in perennial ryegrass-white clover pastures were studied under continuous grazing. During 2 6-week periods in June-July and September-October. Caltle selectively grazed the sward where urine had been recently voided and subsequently grazed these areas more fequently than other areas, while grazing the sward adjacent to the dung pats less intensively than other areas. Despite differences in of herbage mass and light interception resulting from altered grazing patterns, dung did not affect the density of white clover (Trifolium repens L,) growing points or the number of branches per stolo1i in the …
Autumn Management Of Grass-Legume Pasture, D P. Belesky, J M. Fedders, A S. Laidlaw
Autumn Management Of Grass-Legume Pasture, D P. Belesky, J M. Fedders, A S. Laidlaw
IGC Proceedings (1977-2023)
Duration of autumn grazing may affect the long-term balance of grass and legume in a sward. Effects of early and late autumn closing dates were studied on productivity and morphology of orchardgrass (Dactylis glomerata) and white clover (Trifolium repens) in replicated grazed swards. Early-closed paddocks continued to accumulate herbage during autumn, resulting in greater winter senescence than late-closed paddocks. Spring-cut herbage mass was not affected by autumn management; however, late closing had significantly more clover than early closing. Early-closed paddocks were grass domlnanl, with few relatively large tillers and few clover growing points compared with late-closed …
Aspects Of Interference Between Nodding Thistle (Carduus Nutans L.) And Pasture Grasses And Legumes, D A. Wardle, K S. Nicholson, A Rahman
Aspects Of Interference Between Nodding Thistle (Carduus Nutans L.) And Pasture Grasses And Legumes, D A. Wardle, K S. Nicholson, A Rahman
IGC Proceedings (1977-2023)
Nodding thistle (Carduus nutans L.) is an important weed species in New Zealand pastures. The available information on interactions between this species and forage grasses and legumes is summarised and discussed. Nodding thistle inhibits pasture productivity, and allclopathy is probably Important at inhibiting pasture at the later stages of its life cycle. Although, nodding thistle is most susceptible to inhibition by forage species early in its life cycle, a minimum pasture cover may be required for seedlings to establish. Nodding thistle therefore acts as a competitor only at the later stages of its development. Grasses arc both stronger at inhibiting …
Seedling Emergence From Buried Seed In Unsown And Oversown Hill Pasture, M E. Wedderburn, W J. Pengelly, L A. Greaves
Seedling Emergence From Buried Seed In Unsown And Oversown Hill Pasture, M E. Wedderburn, W J. Pengelly, L A. Greaves
IGC Proceedings (1977-2023)
Seedling recruitment from buried seed was measured in hill country after the resident vegetation was suppressed or killed using herbicide, and either Yatsyn ryegrass, hill ryegrass or a low fertility grass mix was oversown. Unsown plots serves as a control. The total number of seedlings emerging per m2 was similar for all treatments but differences between treatments occurred in the species composition of seedling populations. Ryegrass seedling density in sown plots was 3 times that in unsown plots and white clover seedling numbers were 6 times greater. Other grasses were present in numbers equivalent to sown ryegrass. Subterranean clover and …
The 'Pendulum Paradigm' - Trends In Nitrogen Fertilizer Use On Temperate Grass/ Clover Pastures, R J. Eckard, F R. Mckenzie, P A. Lane
The 'Pendulum Paradigm' - Trends In Nitrogen Fertilizer Use On Temperate Grass/ Clover Pastures, R J. Eckard, F R. Mckenzie, P A. Lane
IGC Proceedings (1977-2023)
Nitrogen fertiliser responses, on perennial ryegrass (Lolium perenne) / white clover (Trifolium repens) dominant pastures, are compared between sub-tropical South Africa and temperate Australia. The data highlight the similarity in inflection point of the response curve, while emphasising the influence of high residual soil N at lower N application rates. The propensity of communities to oscillate between extremes in terms of N fertiliser use on intensive pasture, or the ‘Pendulum Paradigm’ is discussed. Particular reference is made to the dramatic increase in N fertiliser use in dairy pasture of temperate Australia and New Zealand. Emphasis is …