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Articles 451 - 480 of 12002
Full-Text Articles in Physical Sciences and Mathematics
Gene Action And Enhanced Progressive Heterosis In Autotetraploid Alfalfa, D R. Woodfield, E T. Bingham
Gene Action And Enhanced Progressive Heterosis In Autotetraploid Alfalfa, D R. Woodfield, E T. Bingham
IGC Proceedings (1993-2023)
Two-allele populations (TAPs) of autotelraploid alfalfa (Medicago sativa L.) were used to evaluate whether progressive heterosis can be enhanced through accumulation of favourable- alleles._ Comparisons involved 4 TAPs per se, and single- and double-crosses produced by hybridising the TAPs, at both the original (OG) and advanced generation (AG) levels. When the different progenies were compared as a percentage of the "Vernal" check, AG crosses exhibited consistent improvements in breeding value over their OG counterparts and also show enhanced progressive heterosis. These improvements occurred despite higher inbreeding levels (decreased heterozygosity) in the AG progenies and indicate that heterosis can be …
Plant Improvement: The Evaluation And Extension Processes, A S. Laidlaw, K.F M. Reed
Plant Improvement: The Evaluation And Extension Processes, A S. Laidlaw, K.F M. Reed
IGC Proceedings (1993-2023)
Registration and evaluation systems throughout the world range from voluntary registration to compulsory schemes involving assessment of taxonomic and agronomic characteristics. Evaluation can be confined to agronomic tests simulated under grazing management or extended to feeding-value trials. Criteria include adaptation to climate and soils, persistence and seasonal growth, annual dry matter production, resistance to pests and diseases, and association with beneficial organisms. The need for stress (e.g. drought, low nutrients, acidity, salinity, heat or cold) to be given more emphasis in programmes in specific localities is suggested. In developing regions the emphasis is screening a wide range of grasses and …
Achievements And Perspectives In The Breeding Of Forage Grasses And Legumes, A.J P. Van Wijk, J G. Boonman, W Rumball
Achievements And Perspectives In The Breeding Of Forage Grasses And Legumes, A.J P. Van Wijk, J G. Boonman, W Rumball
IGC Proceedings (1993-2023)
Successful breeding progrnmmes on forage grasses and legumes have in common that they made seed and plant material of superior genetic and physical quality available to the end-user at competitive prices. This was achieved by government- and privately-funded breeding programmes. A distinction between these two types of breeding organisations is made and discussed. Achievements in various areas are presented and the constraints the breeder is faced with ore given. It is felt that highly advanced genetic designs are not directly applicable, but that progress can continue to be made by applying classical procedures at a greater level of efficiency.
Nutritive Value Of Regrowth Of Pennisetum Parents And Hybrid Progeny, S C. Schank, D A. Diz, R L. Smith
Nutritive Value Of Regrowth Of Pennisetum Parents And Hybrid Progeny, S C. Schank, D A. Diz, R L. Smith
IGC Proceedings (1993-2023)
Low forage nutritive value of the giant forms of elephantgrass (Pen,1isetum purpureum Schum.) has limited its production In tropical areas. A dwarf cultivar, Motl ·(released In 1988), has given convincing evidence of much higher forage quality. A tall elephantgrass (cv. Kinggrass, USDA PI 300086) was hybridised with Moll. Over 400 lntraspecific hybrids were obtained in 1988 and evaluated. Yield and forage 11utrillve value of the two parents and selected progeny were compared. Dry matter production was measured at 6-week regrowth and 12-week regrowth during 1990. Samples collected were analysed for in vitro digestible organic matter (IVDOM) and crude protein (CP), …
Divergent Selection For Forage Yield Components In Switchgrass, R Bortnem, A Boe, K D. Kephart
Divergent Selection For Forage Yield Components In Switchgrass, R Bortnem, A Boe, K D. Kephart
IGC Proceedings (1993-2023)
The objective of this study was to evaluate half-sib families of 30 plants each of Summer and Sunburst switchgrass (Panicum virgatum L.) from a divergent selection for forage yield components programme. Highly significant differences were found among families within each cullivar for blade weight, stem weight, sheath weight and blade-to-stem ratio (BSR) at anthesis. The family x year interaction was significant only for BSR for Summer. Highly significant differences were found nmong families from "high" and "low" parents for each of the 4 traits. Genetic variances were higher for Summer than Sunburst for 3 of the 4 traits. Phenotypic …
Alfalfa Stem Architecture Effects On Forage Quality, K D. Kephart, A Boe, R Bortnem
Alfalfa Stem Architecture Effects On Forage Quality, K D. Kephart, A Boe, R Bortnem
IGC Proceedings (1993-2023)
Forage quality in alfalfa (Medicago sativa L.) may be improved by selection for increased branching to dilute stem bases with less lignified branch tissue. This research was done to determine the effects of selection for branching on growth and forage quality of alfalfa stems. Divergent selection for the mass ratio of aidllary. to main stems (AMR) was done within 2 alfalfa cultivars and tested at 2 locations. High-AMR genotypes had about 16% greater AMR than low-AMR genotypes. Although differences in AMR existed, i11 vitro digestible dry matter (IVDDM) concentration of total stems and stem branches did not differ between …
Assessment Of Freezing Tolerance And Changes Of Protein Pattern In Italian Ryegrass After Cold Hardening, K Tase, M Kobayashi
Assessment Of Freezing Tolerance And Changes Of Protein Pattern In Italian Ryegrass After Cold Hardening, K Tase, M Kobayashi
IGC Proceedings (1993-2023)
The objective of the present study was to assess the freezing tolerance using LT50 (temperature at which 50% mortality occurs) and to get information on changes of protein pattern in Italian ryegrass (Lolium multiflorum Lam.) after cold hardening. The correlation coefficient between LT50 and percentage of survival plants under field conditions was significantly high at 0.701 ". LT50 was considered to be useful to assess different genotypes and change of freezing tolerance during the winter. This technique will be used in breeding programmes to improve the freezing tolerance. Soluble proteins extracted from hardened and non-hardened seedlings were analysed by …
Breeding And Selecting Of New Improved Cultivars Of Trifolium Subterraneum Spp. Brachucalucinum, C T. De Koning, I D. Kaehne, P.G H. Nichols, R L. Tuckwell
Breeding And Selecting Of New Improved Cultivars Of Trifolium Subterraneum Spp. Brachucalucinum, C T. De Koning, I D. Kaehne, P.G H. Nichols, R L. Tuckwell
IGC Proceedings (1993-2023)
A national programme for the improvement of Trifolium subterraneum ssp. brachycalycinum has been instigated by the National Subterranean Clover Improvement Programme (NSCIP), Australia. At present there are only 2 commercial cultivars,·Ctare and Rosedale. The overall aim of the programme is to develop and release well-adapted early- to mid-season cultivars of ssp. brachycalycinum which are persistent in farming systems and resistant to pests and diseases. Bight crosses were made in 1988. The parents used for the crosses were selected for their earliness, general good performance and strong vigour. Preliminary characterisation of breeding lines in 1991 has shown that early flowering, strong …
Intergeneric Hybrids Of Male Sterile Italian Ryegrass Crossed With Tall Fescue, K Suginobu, T Takamizo, T Komatsu, F Akiyama, Y Tominaga
Intergeneric Hybrids Of Male Sterile Italian Ryegrass Crossed With Tall Fescue, K Suginobu, T Takamizo, T Komatsu, F Akiyama, Y Tominaga
IGC Proceedings (1993-2023)
Seed fertility and yield of male sterile Italian ryegrass (Lolium multiflorum Lam.) crossed with tall fescue (Festuca arundinacea Schreb,) varied from 2.8 to 100% and from 0.04 to 9.45 g, respectively. Significant positive correlations were found between seed fertility and seed yield per plant and between seed fertility and Pl percentage of the harvested seed, Spike type and plant type were very similar to those of tall fescue. By contrast, more than SO% of Pl plants tillered In the second crop were unlike tall fescue; however, persistency of the Pl was similar to that of tall fescue. In …
Evaluating Germplasm Collections Of Subterranean Clover For Plant Characteristics Influencing Seed Yield, E Piano, L Pecetti, M Romani, F Spanu
Evaluating Germplasm Collections Of Subterranean Clover For Plant Characteristics Influencing Seed Yield, E Piano, L Pecetti, M Romani, F Spanu
IGC Proceedings (1993-2023)
Strains of Trifalium brachycalycinumm (B) and Trifolium subterraneum • (S) were evaluated for burr burial ability and capacity to set seed when ' burial was artificially prevented. In one experiment S buried a higher • number of burrs and more deeply in the soil relative to B. There was evidel)ce that unburied burrs were undeveloped in S while a higl\ proportion of them developed in. B. In a second experiment prevention of burial drastically reduced seed yield in both species but the reduction was higher in S. Effects on yield components were. also differen.1 in the 2 species, Seeds/burr declined …
Characterization Of Genetic Resistance To Diclofop In Italian Ryegrass, R E. Barker, G W. Mueller-Warrant, S M. Griffith, G M. Banowetz
Characterization Of Genetic Resistance To Diclofop In Italian Ryegrass, R E. Barker, G W. Mueller-Warrant, S M. Griffith, G M. Banowetz
IGC Proceedings (1993-2023)
Diclofop ( (:t)-2-[4-(2,4 • dichlorophenoxy) phenoxy] propanoic acid} has been used to control annual grasses in cereals since 1980 in the Willamette Valley of Oregon, USA. Populations of Italian ryegms (Lolillm multiflorum Lam.) resistant to diclofop were recently discovered. Progenies from resistant plants crossed with plants from the susceptible cvs. Marshall and Gulf were sib-mated and backcrossed to Marshall or Gulf. Resultant F2 and backcross families were screened for survival when sprayed with 1.4 kg/ha diclofop-methyl. Segregation ratios of live to dead plants showed that resistance is determined by 2 genes when a dominant allele is present at each …
Breeding Grasses For Adaptation To Environmental Problems, M O. Humphreys, M W. Humphreys, H Thomas
Breeding Grasses For Adaptation To Environmental Problems, M O. Humphreys, M W. Humphreys, H Thomas
IGC Proceedings (1993-2023)
Hybrids between perennial ryegrass (Lolium perenne L.) accessions from Romania and Hungary were produced in an auempt to improve cold lolerance. Winter survival of hybrids was poorer than expected on the basis of parent performance. In a second breeding programme, introgression of genes from toll fescue (Festuca arundinacea Schreb.) into Italian ryegrass (Lolium multiflorum Lam,) was achieved using pentaploid hybrids between letraploid Italian ryegrass and hexaploid all fcscue and backcrossing twice to diploid Italian ryegrass, Good response to selection for improved drought tolerance was obtained in backcrossed progeny. It appears that in breeding for improved tolerance to …
Is There Variability For Quality In Red Clover, C Moussett-Declas, F Faurie, J L. Tisserand
Is There Variability For Quality In Red Clover, C Moussett-Declas, F Faurie, J L. Tisserand
IGC Proceedings (1993-2023)
At Dijon (Prance), 36 varieties of red clover (Trifolium pratense L.) (24 diploids and 12 tetraplolds) were analysed for dry matter (DM), crude protein (CP), water-soluble carbohydrates (WSC), dry matter digestibility (DMD) and silage parameters in the primary growth. All the forage compounds analysed were significantly different, WSC mean was 5.6291,, much lower than previously reported. The tetraploid varieties appeared better than diploids for CP, WSC and DMD but poorer for DM, All the silages (except two) had excellent quality with pH under 4,0 and volatile fatty acids (VFA) content under 400 mM/kg DM, Selection for quality of forage …
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 (1993-2023)
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 …
Rooting Ability In Red Clover Cuttings, H Mirzaie-Nodoushan, I L. Gordon
Rooting Ability In Red Clover Cuttings, H Mirzaie-Nodoushan, I L. Gordon
IGC Proceedings (1993-2023)
Because of genetic variability within cultivars, studies of cross pollinated plants often require either pure-lines or clones in order to provide fixed parents, However, in red clover (Trifolium pratense L.) because of self-incompatibility, pure lines are hard to produce, Therefore, cloning is one approach for the production of replicated plants with fixed genotypes. This experiment was conducted to assess the amount of rooting potential and its variability between several genotypes. Four prostrate accessions of red clover were used as the whole-plot treatments in a split-plot experiment with 4 replications. The subplots were different portions of the plant. Percentage of …
Improving The Digestibility Of Warm-Season Perennial Grasses, K J. Moore, K P. Vogel, A A. Hopkins, J F. Pedersen, L E. Moser
Improving The Digestibility Of Warm-Season Perennial Grasses, K J. Moore, K P. Vogel, A A. Hopkins, J F. Pedersen, L E. Moser
IGC Proceedings (1993-2023)
The nutritional value of perennial warm-season grasses is limited primarily by digestible energy concentration. The relatively low digestibility of these grasses is due to their high concentration of fibre and its resistance to degradation in the rumen. The objective of this study was to evaluate quantitatively improvements in the digestibility of 5 experimental switchgrass (Panicum virgatum L.) populations in terms of a first-order digestion model in order to develop selection strategies for further improvement. The populations were developed by recurrent restricted phenotypic selection from a base population by l cycle of selection for low and 3 cycles for high …
Breeding Improved Perennial Ryegrass In Australia, P J. Cunningham, C K. Lee, M W. Anderson, J R. Rowe, R G. Clarke, D R. Eagling, O Villalta, H S. Easton
Breeding Improved Perennial Ryegrass In Australia, P J. Cunningham, C K. Lee, M W. Anderson, J R. Rowe, R G. Clarke, D R. Eagling, O Villalta, H S. Easton
IGC Proceedings (1993-2023)
A phenotypic selection programme followed by half-sib family evaluation is being used for the improvement of perennial ryegrass (Lolium perenne L.). Plants have been identified with resistance to bncley yellow dwncf luteovirus, ryegrass mosaic potyvirus and crown rust. Seedling vigour and seasonal growth have been improved relative to standard cultivars. Further evaluation of progeny performance will lead to the development of improved cultivars for Australia.
Possible Use Of Detached-Leaf Method To Evaluate Berseem Clover Germplasm For Resistance To Stemphylium Leaf Spot, F Montorsi, G Di Giambattista, P Martinello
Possible Use Of Detached-Leaf Method To Evaluate Berseem Clover Germplasm For Resistance To Stemphylium Leaf Spot, F Montorsi, G Di Giambattista, P Martinello
IGC Proceedings (1993-2023)
Five cultivars and S ecotypes ofberseem clover (Trifolium alexandrinum L.) were tested in the laboratory with the detached-leaf method for resistance to Stemphylium botryosun. Detached leaves were inoculated in the middle with a 1.5 µI drop of a conidial suspension. Cluster analysis was used to group cultivars and ecotypes on the basis of disease severity. II categorised the tested germplasm as resistant, moderately resistant and susceptible. However, the detached-leaf method used in this research needs validation with field and greenhouse experiments.
Amphitetraploid Festulolium: Chromosome Stability And Female Fertility Over Intercrossing Generations, M Ghesquiere, Z Zwierzykowski, C Poisson, J Jadas-Hecart
Amphitetraploid Festulolium: Chromosome Stability And Female Fertility Over Intercrossing Generations, M Ghesquiere, Z Zwierzykowski, C Poisson, J Jadas-Hecart
IGC Proceedings (1993-2023)
A survey of chromosome stability and female fertility was carried out from 37 Lolium multiflorium x Festuca arundinacea var. glaucescens amphitetraploidhybrids and 86 half-sib progenies derived from 2 subsequent intercrossing generations. The chromosome associations were mostly bivalents and the frequency of aneuploid plants was low, both remaining stable over generations. Fl hybrid selection was not active in improving female fertility of progenies but the mean number of seeds per spikelet was significantly increased by 53% within the first generation and remained significan!ly unchanged in the second generation, not very far from the level of the parental species. Therefore, these amphitetraploids …
An Agro-Ecological Approach To Breeding Subterranean Clover (Trifolium Subterraneaum L.), P.G H. Nichols
An Agro-Ecological Approach To Breeding Subterranean Clover (Trifolium Subterraneaum L.), P.G H. Nichols
IGC Proceedings (1993-2023)
An ecologically based breeding method has recently been adopted by the National Subterranean Clover Improvement Programme in Australia. It differs from the traditional pedigree method by allowing F2-derived lines lo continue segregating in the F4 to F6 generations in target environments under regenerating, grazed sward conditions. Advantages of the new method include: (i) assessment of field performance in the early generations; (ii) Inclusion of regeneration processes in selection procedures; (iii) allowing effects of natural selection to act on segregating lines; and (iv) allowing regional testing centres lo become involved in early generation selection. Disadvantages include possible distortion in the direction …
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 (1993-2023)
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 …
Relative Performance Of Three Cultivars Of Late-Heading Perennial Ryegrass Continuously Stocks By Ewes And Lambs, H Clark
IGC Proceedings (1993-2023)
Three cultivars of late-heading perennial ryegrass (Lolium perenne L.) were continuously but variably stocked with ewes and lambs so as to maintain steady state sward conditions. Net herbage production (NHP) was estimated by following the turnover of tissue on individually marked tillers and monitoring tiller numbers. Animal productivity was measured as lamb live-weight gain and ewe liveweight change and utilised metabolisable energy (UMB) estimated. The cultivars were S23, Melle and Mascot which were categorised outclassed, recommended and rejected, respectively, by the UK's National Institute of Agricultural Botany, NHP rankings for the cultivars (S23==100) were Melle 104 and Mascot 95 …
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 (1993-2023)
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· …
Herbage Intake, Digestibility Characteristics And Milk Production Of A Diploid And Two Tetraploid Cultivars Of Perennial Ryegrass, I W. Hageman, E A. Lantinga, H Schlepers, J H. Neuteboom
Herbage Intake, Digestibility Characteristics And Milk Production Of A Diploid And Two Tetraploid Cultivars Of Perennial Ryegrass, I W. Hageman, E A. Lantinga, H Schlepers, J H. Neuteboom
IGC Proceedings (1993-2023)
In a rotational grazing experiment with dairy cows on monocullures of a diploid and 2 tetraploid cultivars of perennial ryegrass (Lolium perenne L.), at a high herbage allowance the average daily production of fat and protein together was significantly higher on the tetraploids. This was associated with a difference in herbage intake of on average 0.6 kg/cow/day of organic matter and a higher concentration of volatile fatty acids and a lower pH in the rumen.
Development And Evaluation Of Lolium Multiflorum Cultivars To Maximize Winter Production And Extend The Growing Season, D.C W. Goodenough, J.D H. Reusch
Development And Evaluation Of Lolium Multiflorum Cultivars To Maximize Winter Production And Extend The Growing Season, D.C W. Goodenough, J.D H. Reusch
IGC Proceedings (1993-2023)
In autumn-sown, irrigated Lolium multiflorum cultivar evaluation trials conducted at various centres covering most of the Republic of South Africa, Westerwolds-type cultivars consistently outyielded Italian-type cultivars during the critical winter months, In contrast, during spring and, in a few .cultivars, during early summer, Italian type cultivars were superior to Westerwolds types, Results are also given for a breeding programme aimed at improving winter, spring and summer production, increasing dry matter (DM) content and enhancing resistance to rust (Pucclnta coronata Corda),
Persistence And Production Of Perennial Grasses In Southern Western Australia, C M. Saunders
Persistence And Production Of Perennial Grasses In Southern Western Australia, C M. Saunders
IGC Proceedings (1993-2023)
Persistence of 12 genera of perennial grasses was examined on 2 soil types at Green Range (annual rainfall 600 mm), in southern Western Australia, Tall wheat grass was found to be a good all round performer iit terms of persistence and production with 78-79% survival and an average dry matter (DM) production of 61 kg/ha/day. Four cultivars of Festuca ar11ndinacea were in the top 6 performers at the wetter site, producing .58-66 kg/ha/day during the sampling period even though their plant survival was less than 62%. VSPG006 (now released as Roper) and Kangaroo Valley perennial ryegrasses had significantly • better …
Using Cytoplasmic Male Sterility In Improving Forage Productivity Of Sorghum, A A. Young, M A. Nasr, M E. Mousa, M A. Harfoush
Using Cytoplasmic Male Sterility In Improving Forage Productivity Of Sorghum, A A. Young, M A. Nasr, M E. Mousa, M A. Harfoush
IGC Proceedings (1993-2023)
Bighteen sorghum-sudan grass hybrids were produced by crossing 3 male fertile lines of sudan grass to different cytoplasmic male sterile lines of grain sorghum. Hybrids were evaluated with their male parents and 7 check varieties including. 6 commercial hybrids, at 4 experimental stations: Sakha, Gemmeiza, Sids and Ciba Geigy, in summer 1989. The objectives of the study were: I) to assess hybrid vigour, and 2) select the superior hybrids to be used in commercial production in Egypt. From the data obtained in this investigation, the best productivity of green and dry yield were from the F1 hybrids of ms line …
Preliminary Isozyme Studies On Chloris Gayana (Rhodes Grass), P A. York
Preliminary Isozyme Studies On Chloris Gayana (Rhodes Grass), P A. York
IGC Proceedings (1993-2023)
Horizontal starch gel electrophoresis of Chloris gayana (Rhodes grass) identified enzyme systems for use as selectable genetic markers and/or polymorphic loci for cultivllf differentiation, Most enzymes from crushed leaves of Rhodes grass showed anodal migration; but peroxidases exhibited Vllfiation in a multitude of anodal and cathodal bands. Glucose- 6-phosphate dehydrogenase and malate dehydrogenase had a single; locus-zone. Malic enzyme had one clear zone, but possibly another and a trace of cathodal activity, while phosphoglucose isomerase comprised two, designated PGl-1 and PGI-2, as did superoxide dismut115e (SOD-1 and SOD-2). Phosphoglucomutase had a clear fast and a fainter, slower zone-locus. 6-phosphogluconate dehydrogenase …
Grassland Investigation And Mapping Using Remote Sensing In Northern China, Liu Fuyuan, Li Znegyuan, Han Jinaguoguez, Xia Jingxin
Grassland Investigation And Mapping Using Remote Sensing In Northern China, Liu Fuyuan, Li Znegyuan, Han Jinaguoguez, Xia Jingxin
IGC Proceedings (1993-2023)
A large area of grassland in north China is an important resource for animal production, The grassland vegetations of north China were investigated and mapped by means of remote sensing from 1986 to 1990, We adopted various multiple information and multitime phase satellite images which were taken to allow optical and computer processing for complicated cases and difficult areas of grassland classification, The grasslands were divided into 8 different types and 50 groups according to surface features of Landsat images, ecological environment and vegetation analysis, The warm shrub and herbosa grassland, which ls distributed mainly in the rocky mountainous regions, …
Grazing Management For The Control Of Vulpia Spp. In Pastures, C E. Jones, R.D B. Whalley
Grazing Management For The Control Of Vulpia Spp. In Pastures, C E. Jones, R.D B. Whalley
IGC Proceedings (1993-2023)
The effect of strategic grating in spring and autumn on seed production, recruitment and seedling survival of Vulp/11 spp. was assessed in experiments at 2 sites near Armidale on the northern Tablelands of New South Wales. V11lpia spp. field populations in 1992 in autumn-grazed plots which had been heavily grazed in the previous spring were reduced 97.391, at Site 1 and 91,291, at Site 2 in comparison with similar plots which had not been grazed in the previous spring. These reductions were greater than could have been obtained by either winter cleaning or spraytopping with herbicide, the currently recommended management …