Download or read book Process oriented Evaluation of Yield Performance and Nutritive Value of Perennial Ryegrass Lolium Perenne L Genotypes written by Heba Sabry Attia Salama and published by . This book was released on 2010 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Process oriented Evaluation of Yield Performance and Nutritive Value of Perennial Ryegrasse Lolium Perenne L Genotypes written by Heba Sabry Attia Salama and published by . This book was released on 2010 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nutritive Value of Perennial Ryegrass Lolium Perenne L with Special Reference to Genotype and Ploidy related Effects written by Marc Lösche and published by . This book was released on 2010 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Cytological and Physiological Aspects of Seed Yield in Perennial Ryegrass Lolium Perenne L written by Anjo Elgersma and published by . This book was released on 1990 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Evaluation of the Nutritive Value and Endophyte of a New Perennial Ryegrass Lolium Perenne Cultivar Aries HD written by Stephanie Jane Bluett and published by . This book was released on 1999 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance of Perennial Ryegrass Lolium Perenne L Seed Crops Under Water Stress Conditions written by Theodosius Marmaduke Velloza and published by . This book was released on 1997 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summer drought is a major factor limiting the regrowth of perennial ryegrass seed crops. This phase of crop development has a strong influence on seed yield because most of the tillers that contribute towards next season's seed crop are produced or regrown during this period. In recent years many seed fields have exhibited premature decline probably because of extensive drought after harvesting. Therefore, this study was undertaken to (i) assess how post-harvest leaf and tiller development is impacted by the timing and severity of water stress and (ii) identify potential relationships of water stress to flowering and seed yield. Rain-out shelters were used to exclude rainfall from two cultivars which received either no irrigation or 2.5 cm of simulated rainfall in mid-August or mid-September or both. These were compared to an ambient treatment. No rainfall decreased total tiller production by approximately 30% in 1995 and 50% in 1996. There were also moderate reductions in tiller dry weight, tiller height, and slight decreases in number of leaves and the basal diameters. The trend showed that the cultivar Affinity responded quicker to an early irrigation whereas the cultivar Buccaneer had a longer period of summer dormancy. Total soluble sugars concentrations increased as tiller number decreased suggesting the potential for rapid compensatory growth upon alleviation of drought. Limited irrigation during the post-harvest period of regrowth did not generally affect fertile tiller number nor seed yields. Fewer vegetative tillers as the stands aged, together with other changes in plant parameters, may mark the beginning of the dieback problem. In greenhouse studies, four cultivars were rapidly stressed using vermiculite as a growth medium. Though little differences were observed among cultivars when physiological responses were evaluated, stomata' diffusive resistance and leaf temperatures increased, whereas plant water potential and leaf transpiration decreased as stress was prolonged. Plant survival following water stress was largely dependent on cultivar and gravimetric water content of vermiculite. This technique did not reasonably simulate natural drought conditions in terms of plant physiological performances nor soil characteristics, but it was useful to differentiate the ability of different genotypes to survive a drought-induced dieback.
Download or read book Seed Yield and Yield Components of Pennfine Perennial Ryegrass Lolium Perenne L as Influenced by Time and Rate of Spring Nitrogen and Chemical Dwarfing written by William Clyde Young and published by . This book was released on 1987 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seed yield in perennial ryegrass is the product of yield components that develop during the life of the plant. Crop yield potential is defined by the number of fertile tillers, spikelets per spike, and florets per spikelet. It has been shown that perennial ryegrass realizes only a small percentage of the potential as harvested seed, and is an inherently poor seed producer as cultivars have been selected primarily for vegetative production or desirable turf characteristics. The Willamette Valley of Oregon produces nearly all of the perennial ryegrass seed grown in the United States. Environmental conditions during plant growth control potential yield development and the efficiency with which it is used. To increase the efficiency of seed production, it is important to understand the effects specialized cultural management techniques have in this producing region. In these studies on perennial ryegrass, the effects of varying the amount and time of spring applied nitrogen (N), and the effects of the plant growth retardant paclobutrazol were investigated under field conditions using the cultivar Pennfine. In addition, the influence of high levels of early spring N, combined with growth retardant use was investigated. Increased tiller densities, the result of higher N level, can result in a greater seed yield potential. However, as tiller densities become greater, the components of seed yield on individual tillers become smaller. In addition, earlier and more severe lodging result in greater tiller mortality and harvest dry weight losses. Split spring applications totaling 120 to 150 kg N ha−1 appeared to provide a better balance between compensating yield components, while maintaining an economic seed yield. Spring application of paclobutrazol delayed the onset and severity of lodging, resulting in an increased number of fertile tillers in the stand, and a greater number of potential seed sites per unit area. Earlier dates of application had a greater effect in reducing lodging in 1983, but no difference was observed between two spring growth stages in 1984. Reduced lodging appears to enhance seed set, resulting in a greater number of seeds recovered at harvest and a higher floret site utilization (FSU). Harvest index was also increased with paclobutrazol. Application of paclobutrazol significantly increased seed yield, a result of improved seed recovery due to more seeds per spike. However, the increased yield potential resulting from higher N rate was not recovered by application of paclobutrazol where severe lodging conditions occurred prior to the completion of seed filling. Under more normal environmental conditions, 120 kg N ha−1, followed with a growth retardant application, had a significantly greater seed yield than the other treatments.
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1990 with total page 1120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Response of Perennial Ryegrass Lolium Perenne L Seed Yield to Irrigation written by David William Mitchell Geary and published by . This book was released on 2002 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessing the Dry Matter Yield Stability Persistency and Dominance of Perennial Ryegrass Lolium Perenne L in Monocultures and Mixtures of Grazed and Cut Swards written by V. Griffith and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessing the Dry Matter Yield Stability Persistency and Dominance of Perennial Ryegrass Lolium Perenne L in Monocultures and Mixtures of Grazed and Cut Swards written by Vincent Griffith and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Evaluation of Yield and Quality Components of Lolium X Festuca Hybrids written by Garrett Shaun Speer and published by . This book was released on 1983 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Een aantal opbrengstgegevens en voedingsopnames na hybridisatie van raai- en zwenkgrassen zijn nagegaan
Download or read book An Evaluation of the Effects of Annual Ryegrass Cytotype on Herbage Mass Nutritive Value and Cattle Performance written by Sarah Marie Montgomery and published by . This book was released on 2019 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annual ryegrass (Lolium multiflorum Lam.) can be divided into two cytotypes: diploid (2n = 2x = 14) or tetraploid (2n = 4x = 28). Transforming annual ryegrass from diploid to tetraploid often results in increased seedling vigor, more robust growth and, thus, supposedly greater yield. There has been conflicting research that suggests no difference in yield between diploid and tetraploid cultivars, but livestock producers’ question whether benefits exist to utilizing tetraploid cultivars for grazing cattle. This study sought to determine if annual ryegrass cytotype affected cattle average daily gain. Although there were no differences in average daily gain between cytotypes, there were differences among cultivars. In 2017, Jumbo (4x) produced the greatest weight gain, while in 2018, Tam-90 (2x) generated the greatest gain. This study suggests that there are no advantages attributed to average daily gain by utilizing tetraploid, as opposed to diploid cultivars.
Download or read book Perennial Ryegrass Lolium Perenne L Cultivar Response to a Postemergence Application of Mesotrione written by Barbara J. Hinds-Cook and published by . This book was released on 2017 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Perennial ryegrass (Lolium perenne L.) is a widely grown cool season, bunch type, short lived perennial grass that is native to Europe, Asia, and North Africa, but has been adapted globally. Perennial ryegrass is quick to establish, has a long growing season, and produces high seed yield and forage or turf quality (high density, fine leaves, and dark green color). Mesotrione is a selective 4-hydroxyphyenyl pyruvate dioxygenase (HPPD) inhibiting herbicide used for weed control in perennial ryegrass seed production and turfgrass in the USA. HPPD inhibiting herbicides cause a reduction in carotenoids which protect chlorophyll from high energy light. The photodegradation of chlorophyll results in a bleaching of leaf tissue in susceptible plants. In seed production, mesotrione, commercialized in the USA as Callisto®, is applied postemergence in the spring to fall planted perennial ryegrass seed crops. Mesotrione for use in turfgrass, commercialized in the USA as Tenacity®, is applied pre or postemergence. The effects of a postemergence application of mesotrione on chlorophyll concentration, dry biomass, plant height, and seed yield and germination compared to an application of another HPPD inhibitor, pyrasulfotole-bromoxynil, on perennial ryegrass cultivars were evaluated. There were differences in perennial ryegrass cultivar response to a postemergence application of both HPPD inhibitors in chlorophyll concentration and to a postemergence application of pyrasulfotole-bromoxynil in dry biomass. No reduction in plant height was caused by the HPPD inhibitors. Seed yield of the perennial ryegrass cultivars was not negatively impacted by a postemergence application of mesotrione. However, only twelve perennial ryegrass cultivars were evaluated in this study; therefore, caution may be warranted when using mesotrione with other perennial ryegrass cultivars. The effects of mesotrione applied postemergence on perennial ryegrass cultivars at three different temperatures, 5, 25, and 35°C, on chlorophyll concentration, leaf color, and total chlorophyll were investigated. At each temperature, there was a response within some cultivars. The cultivar ‘Derby Xtreme’ exhibited the most sensitivity to mesotrione at 5°C and ‘SR 4660ST’ was the most sensitive at 35C. The cultivar ‘PR 8821’ was the most sensitive overall at all evaluation timings and temperatures. The cultivar exhibiting the most tolerance to mesotrione was ‘Esquire’. Assessing perennial ryegrass cultivar response to mesotrione at one temperature versus another temperature resulted in ‘Allstar 3’ exhibiting less sensitivity at 35 than at 5 or 25°C. The majority of cultivars exhibited more sensitivity at 25 than at either 5 or 35°C. Turfgrass managers should use caution when applying mesotrione postemergence to some perennial ryegrass cultivars if temporary bleaching of the turf is undesirable.
Download or read book Yield and respiration of populations of Lolium perenne as affected by plant growth conditions written by Edwin Kraus and published by . This book was released on 1995 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Evaluation of the Relative Agronomic Value and Cold Hardiness of Perennial Ryegrass Lolium Perenne L written by William Michael Sullivan and published by . This book was released on 1978 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phenomic Evaluation and Molecular Breeding of Field grown Transgenic Perennial Ryegrass Lolium Perenne with Altered Fructan Biosynthesis written by Pieter E. Badenhorst and published by . This book was released on 2014 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
