The Effects of Defoliation on Yield and Seed Production Characteristics of Subterranean Clover PDF Download
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Author: Robert Kuan-Hung Lin
Publisher:
ISBN:
Category : Clover
Languages : en
Pages : 170
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Author: Robert Kuan-Hung Lin
Publisher:
ISBN:
Category : Clover
Languages : en
Pages : 170
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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: Janet Elizabeth Paterson
Publisher:
ISBN:
Category : Bur clover
Languages : en
Pages : 113
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Author:
Publisher:
ISBN:
Category : Forage plants
Languages : en
Pages : 376
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Author: Arthur Henry Leidigh
Publisher:
ISBN:
Category : Subterranean clover
Languages : en
Pages : 24
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Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 724
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Author: Robert Lee Jeffers
Publisher:
ISBN:
Category : Ladino clover
Languages : en
Pages : 206
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Author: J. Allan Smith
Publisher: CRC Press
ISBN: 1000236390
Category : Science
Languages : en
Pages : 878
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Book Description
Approximately 1500 scientists from around the globe participated in the InternationalGrassland Congress at the University of Kentucky in 1981, sharing existingknowledge of grasslands and exploring methods for increasing the productivity oflivestock/forage systems so as to better feed mankind while maintaining or improvingenvironmental quality. Of the nearly 500 papers presented on previously unpublishedoriginal research or experimental research and development projects, 273 were selectedfor inclusion in this book. They cover the current basic and applied research on productionand utilization of forages from grasslands the world over.
Author: P. G. Tow
Publisher: CABI
ISBN: 9780851997032
Category : Science
Languages : en
Pages : 344
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This book describes how competition between plant species, and succession in plant ecosystems, operate in grasslands and grazed pastures, both natural and sown. It discusses how competition both affects botanical structure, productivity and persistence of pastures and is itself regulated by biological, environmental and management factors, such as grazing animals. The book also examines the ways in which competition and succession are analysed, evaluated and measured, and brings to the agricultural arena the considerable progress made in understanding the principles of competition from theoretical and experimental ecology.
Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 940
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