Download or read book Analyses of the Effects of Water Nitrogen and Weather on Growth Grain Yield Biomass Production and Light Use Efficiency of Winter Wheat Triticum Aestivum L written by Francisco Mojarro and published by . This book was released on 1988 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applications of Remote Sensing in Agriculture written by M. D. Steven and published by Elsevier. This book was released on 2013-10-22 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applications of Remote Sensing in Agriculture contains the proceedings of the 48th Easter School in Agricultural Science, held at the University of Nottingham on April 3-7, 1989. The meeting invites 146 delegates from over 22 countries and contributions to this book come from nine countries. This book generally presents a review of the achievements of remote sensing in agriculture, establishes the state of the art, and gives pointers to developments. This text is organized into seven parts, wherein Parts I-III cover the principles of remote sensing, climate, soil, land classification, and crop inventories. Productivity; stress; techniques for agricultural applications; and opportunities, progress, and prospects in the field of remote sensing in agriculture are also discussed.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1989-09 with total page 548 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 1988 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to American Doctoral Dissertations written by and published by . This book was released on 1989 with total page 1252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agronomy News written by and published by . This book was released on 1989 with total page 768 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sept.-Oct. issue includes list of theses and dissertations for U.S. and Canadian graduate degrees granted in crop science, soil science, and agronomic science during the previous academic year.
Download or read book Crop physiological responses to abiotic stress written by Rangjian Qiu and published by Frontiers Media SA. This book was released on 2024-01-03 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1975 with total page 1922 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Use Efficiency Advances and Challenges in a Changing Climate written by Manoj Menon and published by Frontiers Media SA. This book was released on 2019-10-15 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agrindex written by and published by . This book was released on 1995 with total page 1088 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diagnosis of the Nitrogen Status in Crops written by Gilles Lemaire and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing a link between theoretical and applied aspects of plant nutrition and agriculture, this book introduces new concepts in plant nutrition. It shows how these can be applied in order to assess the nitrogen status in crops and to improve nitrogen nutrition through optimized N fertilization management. In this way economic benefits can be obtained, while at the same time preventing detrimental effects on the environment. The main agricultural crops - grasses, wheat, barley, Durum wheat, maize, sorghum, grain legumes and potatoes - are covered. The book will be an invaluable source for agronomists.
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1973 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Annual Meetings Abstracts written by American Society of Agronomy and published by . This book was released on 1998 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1983 with total page 2330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long term Effects of Climate and Nitrogen on Wheat Triticum Aestivum Carbon water Relations in California written by Laura Elizabeth Emberson and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The tracking of crop yields as affected by climate variability and rising carbon dioxide (CO2) levels is essential in creating a framework for sustainable agricultural management decisions in the future (Izaurralde et al. 2003; Rosenberg et al. 2003; Asseng et al. 2015). In this research, winter wheat grown in an arid climate is used as a model system to understand climate and atmospheric changes on crop yield potential. (Idso et al. 1979; Smit et al. 1988; Daniel et al. 2002; Asseng et al. 2015; Stratonovitch and Semenov 2015). Wheat is the third most commonly produced crop in the world (kg/ha) (Field to Market 2012). The following study investigates 16 years of field data (1998-2013) collected from the Century Experiment at Russell Ranch Sustainable Agricultural Facility at Davis, California. The climate at Russell Ranch covers a range of conditions from severe drought to unusually moist, representing total rainfall from 221.1 mm to 735 mm. However, results indicate that the water stress metrics used to describe seasonal water status do not have significant effects on yield outcomes. Analyses also indicate that there is no effect of carbon dioxide on yield within the range from 360-400 ppm during the study period. Results show a strong correlation between nitrogen availability and yields, when controlling for yearly variability and variability within plots of replicated treatments. Results also show that the physiological indicator of stress, represented by carbon-13 discrimination in the grain, improves the modelled description of yield. Other findings indicate that nitrogen limitations have caused much greater stress on yields than climate variability since 1998. The anisohydric adaptation of wheat is hypothesized to be a mechanism to cope with water stress. This plant strategy maintains photosynthetic capacity under stress, by favoring stomatal conductance over turgor pressure. An abiotic explanation of these results suggests climatic conditions have not reached threshold conditions to cause yield changes. Carbon dioxide levels, for instance are currently near 400 ppm, while carbon enrichment experiments only show growth effects above 550 ppm in elevated CO2 experiments. Likely, both explanations are partly responsible for the result. These findings suggest that wheat culture will remain resilient to future climate change and atmospheric change. Chapter 2: Consideration of [delta]13C and [delta]18O in wheat to understand physiological stress and weather reconstruction in a Mediterranean climate Stable isotope signatures of carbon and oxygen in wheat reflect an integrated measure of stomatal aperture throughout the season due to the interface between carbon dioxide being assimilated and water being transpired at the stomatal pore. Stomata close when available water is scare and evapotranspiration rates are high (Barbour et al. 2000; Ainsworth and Long 2005; Farooq et al. 2014). This connection between stomatal conductance and water status is reflected in the strong negative trend of [delta]13C and the strong positive trend of 18O in wheat with increasing vapor pressure deficit (Roden et al. 2000; Fry 2006).This investigation examines the relationship between 13C discrimination ([delta]13C), 18O enrichment ([delta]18O), and weather factors in three plant materials. Wheat bulk straw, straw cellulose, and bulk grain samples archived during a long-term agricultural field experiment. The field experiments original design also has three soil nitrogen treatments (Torbert et al. 2016). This archival data provided two decades worth of samples grown under natural weather conditions, rather than imposed water and carbon dioxide levels. The four major climate factors of interest were seasonal precipitation, the Palmer Drought Severity Index (PDSI), potential evapotranspiration (ETo), and atmospheric carbon dioxide concentration.Changes in stable isotope signatures indicate wheat is experiencing a physiological stress and is responding by stomatal closure. Carbon-13 discrimination had a negative correlation to evapotranspiration as expected, but had no relation to any other weather metric. Oxygen-18 enrichment values had a strong positive correlation with evapotranspiration in all sample types. Grain [delta]18O and cellulose [delta]13C had the most sensitive signals to changes in ETo. Straw cellulose [delta]18O was also strongly correlated to drought severity. The significant negative correlation between carbon and oxygen verifies that the changes in carbon signatures are due to water stress and not other factors. The disparity between [delta]18O responding to both ETo and PDSI, while [delta]13C only responded to ETo illuminates two points. It is evidence that oxygen isotopes are better proxies, in general, for climate conditions than carbon isotopes and that carbon isotope data, paired with [delta]18O data is better for accurately identifying stomatal response to external climate conditions. All the findings above indicate that wheat is under physiological stress throughout the field conditions experienced (Farquhar et al. 1989; Condon et al. 1992; Cabrera-Bosquet et al. 2009a). However, the results also reveal that precipitation conditions over the past two decades of experimentation was not driving the stomatal closure response. Rather, wheat stomata are responsive to the vapor pressure deficit increases and rising temperatures captured in higher ETo values. This study highlights the fact that although the utilization of isotope signatures as proxies has blossomed over the past 40 years, it is essential to understand the isotopes in context of the study to avoid incorrect water stress conclusions.
Download or read book Current Programs written by and published by . This book was released on 1974 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture with Subject Index written by and published by . This book was released on 1987-10 with total page 1238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
