Download or read book Investigations of the Flowering Habit and Winter Survival of Red Clover Trifolium Pratense L During the First Year of Growth written by Henri Paul Therrien and published by . This book was released on 1959 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigating Red Clover Trifolium Pratense L Stand Survival and Uniformity when Under seeded to Winter Wheat Triticum Aestivum L Em Thell Under Low Soil Moisture written by Cora Elizabeth Sarah Loucks and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Red clover (Trifolium pratense L.), when included in corn (Zea mays)-soybean (Glycine max)-winter wheat (Triticum aestivum L. em. Thell) rotations in relay cropping with winter wheat, has been shown to increase organic matter, soil tilth, yield and productivity of the rotation and to decrease soil erosion, nitrate leaching and synthetic nitrogen fertilizer requirements. In spite of these benefits, red clover inclusion into crop rotation has declined, largely due to non-uniformity of red clover stands. In Ontario, causes of heterogeneous red clover stands have not been conclusively determined although the effects of tillage and shifts in competition for light and nutrients between wheat and clover during relay cropping have been investigated. As suggested by the high year effect across those studies, variation in soil moisture during relay cropping likely has a large effect on red clover stand uniformity. We conducted a field experiment repeated over three years to test the impact of different soil moisture deficits on the establishment of clover varieties with different growth habits (single-cut and double-cut). Low soil moisture, beginning either late May or late June, under winter wheat decreased red clover stand densities and above-ground biomass. A second field experiment more specifically examined the effect of water exclusion on red clover stand uniformity over a large area under irrigated and non-irrigated conditions. In 2015, low soil moisture in spring increased stand non-uniformity in non-irrigated plots. Differences between varieties in response to drought and drought tolerance mechanisms were investigated in growth room studies. The double-cut variety Belle had greater leaf area and shoot water content during mild to moderate drought conditions compared to the single-cut variety Altaswede. In contrast, Altaswede had significantly higher survival rates than Belle after moderate to severe drought stress. Differences in drought response and recovery were also observed between other single-cut and double-cut varieties. By demonstrating that red clover growth and stand uniformity can be impacted by drought mechanisms, effective strategies for the development of improved varieties through breeding or screening efforts can be identified.

Download or read book Non uniform Stands of Red Clover Trifolium Pratense L Underseeded to Winter Wheat Tritcum Aestivum L written by Sabrina Veiga Westra and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of the Free Amino Acids in Alfalfa and Red Clover Roots as Related to Winter hardiness and the Occurrence of Hydroxylysine and Hydroxyaspartic Acid in Alfalfa Roots written by Morris Dean Wilding and published by . This book was released on 1960 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Flowering written by Abraham H. Halevy and published by CRC Press. This book was released on 2018-01-18 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: These volumes are an exhaustive source of information on the control and regulation of flowering. They present data on the factors controlling flower induction and how they may be affected by climate and chemical treatments. For each plant, specific information is provided on all aspects of flower development, including sex expression, requirements for flowering initiation and development, photoperiod, light density, vernalization, and other temperature effects and interactions. Individual species are described from the standpoint of juvenility and maturation, morphology, induction and morphogenesis to anthesis. All information is presented alphabetically for easy reference

Download or read book Effect of Plant Growth Regulator and Irrigation on Physiological and Harvest Maturity of Red Clover in Relation to Seed Quality written by Duangporn Angsumalee and published by . This book was released on 2016 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: Red clover (Trifolium pratense L.) seed yield can be affected by plant growth regulators (PGR) and irrigation; however, the effects of these factors on physiological maturity (PM), harvest maturity (HM), and seed quality are unknown. The objectives of this study were to: 1) determine how irrigation and trinexapac-ethyl (TE, a PGR) affect PM, HM, seed viability, and seed vigor of red clover at different stages of maturity, 2) evaluate the effect of irrigation, TE and their interaction on seed yield, its components, and the quality of red clover seeds at harvest, 3) investigate changes in gibberellic and abscisic acid contents in red clover during seed development and maturation, and 4) determine the potential of red clover seed storability under different storage conditions over two years. A field study was conducted over a two-year period at Hyslop Research Farm, Corvallis, Oregon. A single irrigation was applied at first flowering stage (BBCH 55). Five rates of TE, ranging from 0 to 700 g a.i. ha−1, were applied at stem elongation and bud emergence stages (BBCH 32 and BBCH 51, respectively). Seed viability and vigor tests were conducted at Oregon State University Seed Laboratory to measure the effects of treatments on seed quality. Irrigation delayed PM by four days compared to the non-irrigated treatment. The TE applications did not alter seed maturation. At PM, the flower heads contained light brown petals with brownish-green sepals and seeds were pale green to pale yellow. Heads at HM contained dark brown petals and sepals, whereas seeds turned to yellow or yellow-dark grayish purple. Seed dry weight did not change significantly from PM to HM. Seed moisture content at maximum seed dry weight (PM) ranged from 340 to 540 g kg−1 and decreased to below 140 g kg−1 at HM. Seed quality as determined by tetrazolium (TZT), standard germination (SGT), and cold tests (CT) were gradually increased during seed development and maturation. The accelerated aging test (AAT) was not a reliable indicator for evaluating vigor of young seeds. At HM, seeds reached maximum quality for all treatments, with 92 - 98% viability by TZT and SGT, and 90 - 94% vigor by CT. Seed yield was increased by irrigation and TE application, but the interaction between these two treatments was not significant. Irrigation increased seed yield in both years by 10% due to the greater seed weight. However, TE increased seed yield by up to 18% only when applied at stem elongation stage in the second year. The increase in seed yield by TE was attributed to greater number of heads per stem. Neither irrigation nor TE had significant effect on above-ground biomass or stems m−2. Seed viability and vigor were slightly correlated with thousand-seed weight and stems m−2, respectively. However, none of them significantly affected seed quality. The study revealed that seed yield can be increased by: 1) a single irrigation application during first flowering stage (BBCH 55) in both years; and 2) TE application at a rate of 280 g a.i. ha−1 at the stem elongation stage (BBCH 32) in the second-year stand of red clover. Gibberellic acid (GA3) and abscisic acid (ABA) are two major phytohormones that affect seed germination. Changes in the contents of GA3 and ABA from seed development to maturation was conducted using seeds from untreated, TE-treated, irrigated, and TE plus irrigated plots. The GA3 and ABA were extracted from seeds using the solid phase method and were quantified by the liquid chromatography-tandem mass spectrometry (LC-MS/MS). The ABA content was high (1242 pg g−1 DW) at the early stage of seed development, and then gradually decreased to 388 pg g-1 DW at HM. The GA3 content did not change significantly during seed development until HM, ranging from 173 to 187 pg g−1 DW. Irrigation and TE application did not significantly affect the endogenous production of GA3 and ABA in the seeds. The ABA:GA3 ratio was high (6.7) at the early stage of seed development, but seed germination was low (24%). When seeds reached HM, the ABA:GA3 ratio dropped to 2.2 and seed germination increased to 93%. These results suggest that physiological dormancy is not a substantial concern in red clover seeds. However, before scarification, seed with hard seed coat at HM was approximately 34%. Hard seeds were scarified before conducting the germination tests. Maintaining seed quality during storage is essential to ensure value until the time of planting. Two red clover seed lots, untreated and field treated with TE, were stored for 24 months in three conditions: 1) uncontrolled environment of open warehouse (WH), 2) controlled room temperature (RT) at 20°C, and 3) controlled cold storage (CS) at 10°C. Seed quality, i.e., viability and vigor, was determined at 6-month intervals to measure the rate of deterioration after each storage period. Relative humidity (RH) was observed as 55% in RT and 90% in CS. Average seed viability of both seed lots stored in WH and RT and were 96% and 95%, respectively, throughout the 24-month storage period. Seeds stored at RT for 24 months maintained high vigor of 87% as determined by the AAT, whereas seeds stored at WH maintained vigor of 81% for 18 months and then dropped to 67% at the end of the 24-month storage period. In CS, seed viability and vigor gradually dropped, reaching 0% at the end of the 24-month storage period due to the adverse effect of the high RH (90%) in the CS. Seed maintained acceptable viability and vigor standards of above 80% when seed moisture content was less than 10%. This study suggests that red clover seeds from untreated and TE-treated plots can be stored safely under similar WH conditions used in this study for 18 months and in RT for 24 months when the initial seed moisture content is under 10%. The results of this study improved our understanding of the potential storability of the red clover seed in response to TE application.

Download or read book University of Wisconsin Agronomy Department the First 100 Years written by University of Wisconsin--Madison. Department of Agronomy and published by . This book was released on 2003 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Fertility Level Fall Management and Stage of Cutting on Forage and Seed Yield of Red Clover Trifolium Pratense L written by Henry Neal Markham and published by . This book was released on 1960 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Forage Management in the North written by Dale Smith and published by . This book was released on 1962 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1973 with total page 1244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Dissertation Index 1861 1972 Agriculture written by Xerox University Microfilms and published by . This book was released on 1973 with total page 1226 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book HDBK OF FLOWERING written by Abraham H. Halevy and published by Springer. This book was released on 1985 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: These volumes are an exhaustive source of information on the control and regulation of flowering. They present data on the factors controlling flower induction and how they may be affected by climate and chemical treatments. For each plant, specific information is provided on all aspects of flower development, including sex expression, requirements for flowering initiation and development, photoperiod, light density, vernalization, and other temperature effects and interactions. Individual species are described from the standpoint of juvenility and maturation, morphology, induction and morphogenesis to anthesis. All information is presented alphabetically for easy reference

Download or read book Dissertation Abstracts International written by and published by . This book was released on 1970 with total page 1248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Doctoral Dissertations written by and published by . This book was released on 1960 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts written by and published by . This book was released on 1960 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Clover Science and Technology written by Norman L. Taylor and published by . This book was released on 1985 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contents of this monograph provide a foundation and direction for further research into the basic, biological, and agricultural sciences that support clover production, utilization, development, and technology. Many of the chapters are of a general nature, which apply to the clovers as a genus. In addition, several chapters focus on individual species or groups of species that are of agricultural importance in North America.

Download or read book Bibliography of Agriculture written by and published by . This book was released on 1976 with total page 1732 pages. Available in PDF, EPUB and Kindle. Book excerpt: