Download or read book Amino Acids and Acid Amides as Sources of Ammonia in Soils written by Samuel Leo Jodidi and published by . This book was released on 1912 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Amino Acids and Acid Amides as Source of Ammonia in Soils written by S. L. Jodidi and published by . This book was released on 1912 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of Amino Acids and Nitrates in Soils written by Bernard Wernick Hammer and published by . This book was released on 1915 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Chemical Nature of the Organic Nitrogen in the Soil Second Part written by Arthur Wayland Dox and published by . This book was released on 1911 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of Amino Acids and Nitrates in Soils written by Ralph Sydney Potter and published by . This book was released on 1915 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil Amino Acids and Plant Use in a Semiarid Grassland Exposed to Elevated Atmospheric Carbon Dioxide and Warming written by Janet Chen and published by . This book was released on 2013 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding effects of elevated atmospheric CO2 and climate warming on plant nitrogen availability is important for predicting plant and ecosystem productivity responses to future global changes. Soil amino acids can be present in concentrations comparable to those of inorganic nitrogen and are a potential plant nitrogen source, especially when N availability is low. Production and consumption rates of soil amino acids are known to shift under elevated atmospheric CO2 and warming and likely result in shifts in pools of soil amino acids as well. For my dissertation I characterized soil amino acid composition and plant uptake in plots of the Prairie Heating and CO2 Enrichment (PHACE) experiment in a semiarid grassland exposed to elevated atmospheric CO2 and warming to determine the role of amino acids as a plant nitrogen source. To determine the role of amino acids as a plant nitrogen source, soil amino acid composition was first characterized using a classic method of extraction, involving field collection of soils and laboratory processing, and a novel field method of extraction with minimal soil disturbance. Soil extracts collected with the novel method more closely represent soil pore water and contained glutamate, glutamine and arginine in the highest relative amounts. In contrast, extracts collected with the classic method of extraction represent the entire soil amino acid content, including that from microbial lysis and soil aggregate breakdown, and contained alanine and phenylalanine in the highest concentrations. No significant effect of elevated CO2 or warming on soil amino acid composition was found. However, soil amino acid composition shifted over diurnal and seasonal timescales and these changes correlated with soil moisture and temperature. To determine if plants are capable of consuming amino acids present in soil, alanine and phenylalanine were then used in an uptake capacity experiment using two plant species common at the PHACE field site, Bouteloua gracilis and Artemesia frigida. Hydroponically cultured seedlings were fed alanine or phenylalanine as a sole nitrogen source. Within 30 minutes of feeding, all plants consumed over 99% of fed amino acids, demonstrating high plant uptake capacity. No effect of elevated CO2 was observed. After identifying soil amino acids present in the semiarid grassland and plant species capable of amino acid uptake, I performed a nitrogen preference and microbial competition study in field using B. gracilis to determine if plants use amino acids as a nitrogen source in the semiarid grassland. Plants were fed 15N (and 13C) labeled ammonium, nitrate and alanine in a nitrogen uptake and preference experiment in PHACE plots. After a 3 h feeding, little to no 15N or 13C was recovered in plant biomass regardless of the labeled nitrogen form. Although elevated CO2 and warming treatments separately increased overall plant nitrogen uptake compared to ambient and elevated CO2 plus warming treatments, increased uptake was minimal compared to microbial consumption. The majority (40-70%) of all fed 15N and 13C was observed in microbial biomass. High microbial sequestration of nitrate, ammonium and alanine and low plant uptake suggests that plants do not take up soil amino acids in the semiarid grassland due to strong microbial competition. Nitrogen preference, elevated CO2 and warming did not have an effect on microbial uptake. Although amino acids are present in soils and plants have the physiological capacity to consume this nitrogen source rapidly in hydroponic culture, B. gracilis plants in PHACE plots did not use soil amino acids as a direct nitrogen source. Furthermore, B. gracilis had very low inorganic nitrogen uptake in the field after our short-term feeding experiment indicating weak short-term competition for nitrogen. Rapid microbial sequestration of alanine as well as inorganic nitrogen suggests that strong microbial nitrogen competition is the main cause for reduced plant nitrogen uptake in field versus hydroponic culture. Grassland plant nitrogen demands are therefore likely met through low but consistent uptake and storage of inorganic or organic nitrogen released by microbes maintained over longer time scales not investigated in my dissertation.

Download or read book Technical Bulletin written by Michigan State University. Agricultural Experiment Station and published by . This book was released on 1916 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Bulletin Michigan Agricultural Experiment Station East Lansing written by Michigan State University. Agricultural Experiment Station and published by . This book was released on 1908 with total page 798 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nitrogen in the Marine Environment written by Edward J. Carpenter and published by Elsevier. This book was released on 2013-10-22 with total page 919 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen in the Marine Environment provides information pertinent to the many aspects of the nitrogen cycle. This book presents the advances in ocean productivity research, with emphasis on the role of microbes in nitrogen transformations with excursions to higher trophic levels. Organized into 24 chapters, this book begins with an overview of the abundance and distribution of the various forms of nitrogen in a number of estuaries. This text then provides a comparison of the nitrogen cycling of various ecosystems within the marine environment. Other chapters consider chemical distributions and methodology as an aid to those entering the field. This book discusses as well the enzymology of the initial steps of inorganic nitrogen assimilation. The final chapter deals with the philosophy and application of modeling as an investigative method in basic research on nitrogen dynamics in coastal and open-ocean marine environments. This book is a valuable resource for plant biochemists, microbiologists, aquatic ecologists, and bacteriologists.

Download or read book Journal of Agricultural Research written by and published by . This book was released on 1931 with total page 1182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Journal of the American Peat Society written by and published by . This book was released on 1917 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department Bulletin written by United States. Department of Agriculture and published by . This book was released on 1928 with total page 1464 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bulletin written by United States. Dept. of Agriculture and published by . This book was released on 1928 with total page 1458 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Host Bibliographic Record for Boundwith Item Barcode 30112088652950 written by and published by . This book was released on 1928 with total page 1310 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliographical Bulletin written by National Agricultural Library (U.S.) and published by . This book was released on 1928 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bulletins of the Experiment Stations written by Elise Lucy Ogden and published by . This book was released on 1924 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: This bulletin lists approximately 12,500 of the 17,500 or more publications of the State experiment stations (including those of Alaska and the insular possessions) from 1875 to 1920, inclusive.

Download or read book Some Results of Cutting in the Sierra Forests of California written by Duncan Dunning and published by . This book was released on 1928 with total page 1502 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pp. 24.