The Ecology and Use of Subterranean Clover (Trifolium Subterraneum L.) as a Pasture Legume PDF Download
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Author: Michael Langford Smetham
Publisher:
ISBN:
Category : Pastures
Languages : en
Pages : 59
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Book Description
Author: Michael Langford Smetham
Publisher:
ISBN:
Category : Pastures
Languages : en
Pages : 59
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Book Description
Author: Timothy Tyson Scanlon
Publisher:
ISBN:
Category : Aluminum
Languages : en
Pages : 260
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Book Description
[Truncated abstract] Subterranean clover (Trifolium subterraneum) (subclover) is the dominant pasture legume in southern Australian pastures. In the south-west of Western Australia (WA), there has been a perceived decline in the productivity and persistence of subclover. However, there is a lack of quantitative data on this decline and the possible causes. In this thesis I have reported upon an investigation into the limitations to subclover composition and the pasture growth rates of subclover-based pastures. Farmer perceptions of pasture decline in WA were also assessed. In the growing season of 2004, 65 farmers were surveyed to assess the performance of subclover-based pastures in WA from 1974-2004. Increased cropping frequency and longer cropping phases (phase-farming rather than ley-farming) was prevalent even in those enterprises dominated by grazing and pasture production. The majority of farmers had not perceived that pasture productivity, or subterranean clover persistence, had declined. However, most survey respondents felt that subterranean clover pasture productivity was suboptimal (59%). Farmers cited competition from weeds (29.5%), poor seed set (34.4%) and seasonal variability (36.1%) as contributing factors to suboptimal productivity. Farmers estimates of pasture composition differed from measured values, with the average proportion of subterranean clover in pasture estimated at 38.5%, with the actual value at 18.0%. This study found through regression tree analysis that the ideal pasture composition to maximise growth rate while maintaining a subterranean clover content (to ensure nitrogen fixation) was approximately 40% subterranean clover and 40% grass as the best performing pastures across the state. In September 2004, sites were sampled from 2 paddocks on each of 16 farms (identified from the survey) for soil and plant nutrient concentrations, pasture composition, root nodulation and disease levels. Pasture growth rate (PGR) was determined using from satellite remote sensing data. These data were analysed using multivariate statistical techniques (regression tree and principal components analysis) in order to account for the factors that had the largest influence on pastures across a wide geographical range of sites. Most pastures had a low proportion of annual legume (
Author: Arthur Henry Leidigh
Publisher:
ISBN:
Category : Subterranean clover
Languages : en
Pages : 24
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Author: John Frame
Publisher: CRC Press
ISBN: 0429530188
Category : Science
Languages : en
Pages : 313
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Book Description
With the underpinning role of forage legumes in the nitrogen economy and animal productivity from temperate grasslands certain to expand in the future, particularly in regions where their potential has not yet been realized, it is essential that the wealth of information currently available is widely disseminated. This book serves the purpose with
Author: J. Morrison
Publisher:
ISBN:
Category :
Languages : en
Pages : 2
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Author: Donald L. Sparks
Publisher: Gulf Professional Publishing
ISBN: 9780120007974
Category : Science
Languages : en
Pages : 430
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Book Description
Advances in Agronomy continues to be recognized as a leading reference and a first-rate source of the latest research in agronomy. Major reviews deal with the current topics of interest to agronomists, as well as crop and soil scientists. As always, the subjects covered are varied and exemplary of the myriad subject matter dealt with by this long-running serial. Editor Donald Sparks, former president of the Soil Science Society of America and current president of the International Union of Soil Science, has just been appointed the S. Hallock du Pont Chair of Plant and Soil Sciences at The University of Delaware. Maintains the highest impact factor among serial publications in Agriculture Presents timely reviews on important agronomy issues Enjoys a long-standing reputation for excellence in the field
Author: Jeffrey John Steiner
Publisher:
ISBN:
Category : Clover
Languages : en
Pages : 278
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Book Description
Subterranean clover (Trifolium subterraneum L.) seed production practices in Oregon are different from those in Australia. There, seed is produced on fields which are managed primarily for forage. In Oregon, seed fields are managed for seed as the primary product and forage is of secondary concern. Some sheep grazing is necessary to prevent low seed yields due to excessive forage growth. However, no information is available describing how grazing can be used to optimize seed yields. The purpose of this study was to determine the effects of defoliation on the seed yield of subclover and to suggest alternative management practices, if necessary, to improve seed yields. Moderate grazing applied during flowering and continued until early bur fill, increased seed yields 51 and 27% in 1979 and 1980. Grazing treatments shorter in duration increased seed yields, but not as much. A short-duration grazing treatment prior to flowering reduced seed yields 13% in 1980. Seed yield increases were due to an increase in the number of seeds produced (r = 0.99 in both years). The effect of grazing was to modify the canopy to allow for an increase in plant growth during the later stages of reproduction. However, the plants needed to be allowed to recover fully from the grazing treatments to allow for adequate seed fill. Plants which were mechanically defoliated did not fully recover and showed seed size reductions. Defoliation, position of leaves within the canopy, phenological stage of development, and the conditions under which the plants are grown all affect the specific leaf weight of the leaves. This introduces variation which reduces the predictability of leaf area from leaf dry weight. Care should be given to selecting the samples of leaves which are used to make leaf area predictions.
Author: Carolyn Theresa De Koning
Publisher:
ISBN:
Category :
Languages : en
Pages : 540
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Author: Javier Loidi
Publisher: Springer
ISBN: 3319547844
Category : Science
Languages : en
Pages : 687
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Book Description
This book provides a compact, up-to-date and detailed overview of the vegetation of the Iberian Peninsula, a highly diverse part of Europe in the Mediterranean area. Written by a group of experienced researchers, the volume includes a first section with general chapters discussing the climate, the biogeography and the flora, and a second section with detailed descriptions of the 14 regional sectors into which the peninsula and Balearic Islands have been divided. A third section explores special features, such as aquatic vegetation, gypsum and dolomite vegetation, coastal vegetation, mountain flora and vegetation, conservation issues and alien flora.
Author: James Duke
Publisher: Springer Science & Business Media
ISBN: 1468481517
Category : Science
Languages : en
Pages : 354
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Book Description
In 1971, Dr. Quentin Jones, now of the National Hawaii, where an international panel convened to Program Staff, SEA, USDA, suggested that the discuss and assemble information on underexploit Plant Taxonomy Laboratory devise a format for ed tropical legumes. Conversations at that meeting concise write-ups on 1,000 economic plants (Duke and subsequent correspondence with the partici and Terrell, 1974; Duke et al. , 1975). Dr. C. F. pants also yielded new information on some of the Reed was contracted to search the literature on tropical legumes. Finally in 1978, 100 copies of the writeups these economic plants, which included 146 species of legumes. From 1971 through 1974, Dr. Reed were delivered to the International Legume Con prepared rough drafts of write-ups on the 1,000 ference at Kew, July 24th-August 4, and all were species. It was my responsibility to establish the given to potential cooperators before my lecture on format and monitor the write-ups, to ensure that the manual (July 31st). New information presented they would answer many questions on legumes in lectures at that conference and personal com directed to the USDA by our taxpaying public. munications behind the scenes have also been used Since then, a computerized system alerts me to to update and embellish the write-ups so that they new publications on legumes. I have ordered for are more than a bibliographic echo. our files copies of the more promising documents.
