Download or read book Predicting Soil Nitrogen Supply written by Gerard H. Ros and published by . This book was released on 2011 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Tests for Predicting Nitrogen Supply in Irish Soils written by Noeleen Theresa McDonald 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 Investigation Into the Factors Affecting Soil Nitrogen Supply Under Irish Conditions and Methods that Can be Used to Predict Soil Nitrogen Supply written by Siobhán Walsh and published by . This book was released on 2017 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nitrogen Supply from Soil Organic Matter written by Cheyenne Sloan and published by . This book was released on 2021 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: Northern highbush blueberry (Vaccinium corymbosum L.) is a globally important specialty crop, and maintaining high productivity in blueberry systems depends in part on proper N management. Nitrogen can be provided by applying fertilizers or through mineralization of soil organic matter (SOM); however, the amount of N released through mineralization of SOM is difficult to predict and is not always considered in development of N fertility programs. This thesis covers the knowledge gap of N mineralization in high organic matter soils and how N release from SOM might impact northern highbush blueberry plants. Two experiments were conducted to: (1) identify N application rates that maximize fruit quality and yield and understand how optimal N rates change across soils with different SOM contents and (2) identify soil properties that are predictors of N mineralization from SOM that work in high organic matter soils and are cost-efficient, rapid, and scalable to commercial grower service laboratories. The first experiment had three N fertilizer treatments, including low (33-50 kg N ha-1), medium (67-84 kg N ha-1), and high (102-118 kg N ha-1) rates of N, that were applied for 2 years in 4 mature, commercial 'Duke' blueberry fields that were located in northwest Washington representing a range of soil organic carbon (SOC) contents 3-28%. Results suggested there was substantial N mineralization throughout the growing season at sites with higher SOM; however, higher N rates were not required to maximize fruit yield and quality at sites with lower SOM. Even the lowest N rates within this study appeared to be sufficient for production. The second experiment studied 10 soils collected from commercial blueberry fields in northwest Washington with varying levels of SOC (3-43%). These soils were incubated for 6 months, and several potential predictors of net N mineralization were evaluated. Findings from the second study suggested that soil total N is a reasonable predictor of potentially mineralizable N in high organic matter soils. As total N analysis is already available from most commercial grower service laboratories, growers may be able to adjust N application rates based on the test with little cost or additional time.
Download or read book Soil Ecology and Management written by Joann K. Whalen and published by CABI. This book was released on 2010 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the organisms inhabiting the soil, their functions and interactions and the dimensions of human impact on the activity of soil organisms and soil ecological function; and discusses basic soil characteristics and biogeochemical cycling, key soil flora and fauna, community-level dynamics (soil food webs) and the ecological and pedological functions of soil organisms. Also conveys an understanding of how human activities impact upon soil ecology in a section on ecosystem management and its effects on soil biota.
Download or read book Indigenous Nitrogen Supply of Rice is Predicted by Soil Organic Carbon written by Matthew Burleigh Espe and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Efficient management of rice (Oryza sativa) nutrition across soils ranging from organic to mineral soils varies widely due to large contributions of nutrients, including N, from the indigenous supply. This study tested the hypothesis that the indigenous N supply (INS) would increase if the SOC content of the rice paddy soil increased, evaluated across a wide range of soil organic carbon (SOC) content. The INS, defined as N uptake from N omission plots, was estimated from 54 plots over a three year period at two locations in the Sacramento-San Joaquin Delta over a range of SOC from 6 to 232 g SOC kg−1. Additionally ten N rate trials (0 to 160 kg N applied ha−1) were conducted concurrent with the N omission plots. The INS did not increase as SOC increased across the entire SOC gradient, and instead exhibited a concave quadratic trend across the SOC gradient; greatest in the 110-170 g SOC kg−1 range and lower in sites with less than 110 g SOC kg−1 or more than 170 g SOC kg−1. Consequently, positive yield response to N fertilizer was observed in soils with low INS, with no positive yield response on soils with high INS. This study indicates that the INS can be predicted by the SOC content, hence fertilizer-N recommendations should include considerations for SOC content.
Download or read book Labile Organic Nitrogen Fractions written by Mervin St Luce and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Short-term nitrogen (N) availability in agricultural soils is derived mostly from the labile organic N pool. A better understanding of N transformation processes that occur in key labile organic N fractions is necessary to recognize their role in N cycling and their relative contribution to N mineralization. The objectives of this thesis were to (1) examine, under field conditions, the influence of preceding legume and non-legume crops on microbial biomass N (MBN), water-extractable organic N (WEON), and particulate and light fraction organic matter N (POMN, LFOMN) across five sites and how these fractions supply N to canola (Brassica napus L.), as determined from N uptake and grain yield, and (2) investigate under controlled conditions, the incorporation and turnover of crop residue N through MBN, WEON, POMN and LFOMN. Labile organic N fractions were similar regardless of preceding crop but varied across sites due to soil and climatic conditions. The POMN was the best single predictor of soil N supply (R2 = 0.56 and R2 = 0.70 for yield and N uptake, respectively). Soil N supply was related to POMN, mineral N and sand content, which explained 68% of the variation in grain yield and 71% of the variation in N uptake. Sandy-loam and clay soils were incubated for 112 d with 15N-labelled faba bean (Vicia faba, C/N ratio = 29) and wheat (Triticum aestivum L, C/N ratio = 91) residues. After 3 d, most (17-30%) of the residue 15N was recovered in the POMN, with a greater proportion of the wheat than the faba bean residue recovered in the POMN fraction. The 15N recovered in the POMN fraction after 3 d was significantly related to mineral N released after 112 d (r = 0.78, P
Download or read book Soil Nitrogen written by William Victor Bartholomew and published by . This book was released on 1972 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Strategic Soil Nitrogen Test for Flooded Rice written by John Francis Angus and published by . This book was released on 2000 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The overall objective is to develop a commercial test to predict soil N supply to rice"--P. 3.
Download or read book Advances in Agronomy written by Donald L. Sparks and published by Academic Press. This book was released on 2019-01-08 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Agronomy, Volume 153, the latest release in this comprehensive series, continues its recognition as a leading, first-rate source for the latest research in agronomy. Each volume contains an eclectic group of reviews by leading scientists throughout the world. As always, the subjects covered are rich, varied, and exemplary of the abundant subject matter addressed by this long-running serial. Chapters in this updated volume include Novel Practice and Smart Technologies to Maximize the Nitrogen Fertilizer Value of Manure for Crop Production in Cold Humid Temperate Regions, Nitrogen Fertilization Management of Switchgrass, Miscanthus and Giant Reed: A Review, and much more. Includes numerous, timely, state-of-the-art reviews on the latest advancements in agronomy Features distinguished, well recognized authors from around the world Builds upon the venerable and iconic Advances in Agronomy series Covers the extensive variety and breadth of subject matter in the crop and soil sciences
Download or read book Advances in Agronomy written by and published by Academic Press. This book was released on 2011-06-17 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Agronomy continues to be recognized as a leading reference and a first-rate source for the latest research in agronomy. As always, the subjects covered are varied and exemplary of the myriad of subject matter dealt with by this long-running serial. Maintains the highest impact factor among serial publications in agriculture Presents timely reviews on important agronomy issues Enjoys a long-standing reputation for excellence in the field
Download or read book Nitrogen Fluxes in Intensive Grassland Systems written by H.G. van der Meer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterisation and Prediction of Nitrogen Supplying Potential of Mineral Soils written by Naoise Nunan and published by . This book was released on 1997 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Prediction of Soil Nitrogen Availability in Forest Ecosystems written by D. R. Keeney and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mineral Nitrogen In The Plant Soil System written by R Haynes and published by Elsevier. This book was released on 2012-12-02 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mineral Nitrogen in the Plant-Soil System provides integrated accounts of the transformations and fate of mineral nitrogen in the plant-soil system. This book emphasizes the understanding of various processes and the factors that affect these processes. It also focuses on the role of biological nitrogen fixation in nitrogen cycling in natural and agricultural systems. The book is divided into seven major chapters and each chapter is further subdivided into various subtopics. The first chapter introduces and outlines the origin, distribution, and cycling of nitrogen in natural and agricultural terrestrial ecosystems. Chapter 2 focuses on the processes of decomposition and mineralization-immobilization turnover. The processes of nitrification are discussed in detail in Chapter 3. The following four chapters discuss topics of retention and movement of nitrogen in soils; gaseous losses of nitrogen; uptake and assimilation of mineral nitrogen by plants; and lastly, the use of nitrogen in agronomic practice. The book will be invaluable to graduate students and researchers in the field of agriculture. This will also cater other parties interested, such as agronomists, soil scientists, plant physiologists, horticulturists, and foresters.
Download or read book Nitrogen in Soils of China written by Zhu Zhao-liang and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of soil nitrogen has long been an active field, but it was generally pivoted on agricultural and forestry production, and animal husbandry. With the rapid increase in the use of fertilizer nitrogen, more attention has been paid to the rela tionship between nitrogen management and environmental quality and human of soil nitrogen has become more comprehensive with health. In addition, the study the development of related sciences. The quantitative study of the processes in nitrogen cycling and their interrelationships has been an important part of this project and has attracted the attention of scientists allover the world. Nitrogen is one of the most important nutrients for plant growth and the applica tion of fertilizer nitrogen is playing an important role in agricultural production. The annual consumption of fertilizer nitrogen in the world has reached 70 million tons, and China has an annual consumption of more than 15 million tons and is the largest fertilizer nitrogen consumer in the world. However, the efficiency of nitro gen fertilizer is low and losses are large. It is estimated that nitrogen losses from agriculture in our country can be as high as 40-60% of the nitrogen applied. Some of the lost nitrogen enters the atmosphere and contributes to the greenhouse effect and some enters water bodies to pollute the water.
Download or read book Soil Nitrogen Supply written by Jacynthe Dessureault Rompre and published by Mdpi AG. This book was released on 2022-08-25 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, a printed edition of the Special Issue Soil Nitrogen Supply: Linking Plant Available N to Ecosystem Functions and Productivity, presents thoughtful research papers that will advance our understanding of this fascinating topic. New knowledge about modeling and the impact of cover crops, crop residues, soil amendment, and other management practices is presented in the context of agricultural and urban ecosystems.
