Download or read book Rice Yield and Nitrogen Dynamics as Affected by Alternative Residue Management Practices and Winter Flooding written by Alison Joy Eagle and published by . This book was released on 2000 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbon and Nitrogen Dynamics in Flooded Soils written by G. J. D. Kirk and published by Int. Rice Res. Inst.. This book was released on 2000 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book California Agriculture written by and published by . This book was released on 2001 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Alternative Post Emergence Nitrogen Management Strategies for Delayed flood Rice Production written by Richard Edward Turner and published by . This book was released on 2017 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rice (Oryza sativa L.) that is grown in the U.S. is predominantly grown in the mid-south. Current Mississippi State University recommendations for nitrogen (N) fertilization of rice suggest a single application of 168 kg N ha−1 on soils with CEC ≤ 20 and 202 kg N ha−1 on soils with CEC > 20. The primary objective was to identify alternative N management strategies that may potentially be used to reduce costs associated with aerial application of N fertilizer to rice. Research was established at the Delta Research and Extension Center, at Stoneville, MS, on two soil textures during 2015 and 2016. The combination of application timings and N sources resulted in a total of eight N management strategies. Data from all siteyears were pooled together for analysis to evaluate differences among N management strategy. Urea + [N-(nbutyl)thiophosphoric triamide] (NBPT) applied in a single application 7 days before flood (DBF), two-way split application, and PCU-2 LF produced statistically similar and greatest mean rice grain yield. These data suggests that N fertilizer can be applied early (2 to 3 leaf growth stage) from a ground based fertilizer spreader prior to the levee construction. Single optimum and two-way split N management strategies produced more total dry matter (TDM) at heading (HDG) and more N uptake at HDG. Urea + NBPT applied in a single application 7 DBF should be the N management strategy of choice in mid-southern U.S. rice production.
Download or read book Nitrogen Economy of Flooded Rice Soils written by S.K. de Datta and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: The steadily increasing cost of nitrogen fertilizer has resulted in more emphasis on basic and applied studies to improve nitrogen use efficiency in lowland rice. The efficiency of fertilizer nitrogen in farmers' fields is shockingly low ~ a luxury resource-scarce farmers in tropical Asia can ill afford. We believe it is critical to quantify the basic transformation processes and develop management practices for higher N use efficiency for two reasons. They are: 1. Nitrogen fertilizer together with water management is a key factor for achieving the yield potentials of modern rices. 2. Fertilizer nitrogen prices are high and most Asian rice farmers are poor. The International Rice Research Institute (IRRI), Philippines; Internation al Fertilizer Development Center (IFDC), USA; Commonwealth Scientific and Industrial Research Organization (CSIRO), Australia; U.S. Universities (Louisiana, Cornell, California, Arkansas and others); and Dr Justus Leibig University in West Germany are actively engaged in individual or collaborative research that addresses basic transformation processes on N gains and losses and management practices to maximize N use efficiency in rice. It is appropriate to update and summarize, in a double issue of Fertilizer Research, the 10 papers presented at the special symposium organized by the American Society of Agronomy (ASA) at the 75th Annual Meeting in Washington, D.C. in 1983. S.K. De Datta, Head of Agronomy Department, IRRI, was chairman of the International Agronomy Division of ASA (A-6) in 1982 and 1983.
Download or read book Effects of Agricultural Conservation Practices on Fish and Wildlife written by and published by . This book was released on 2008 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The bibliography is a guide to recent scientific literature covering effects of agricultural conservation practices on fish and wildlife. The citations listed here provide information on how conservation programs and practices designed to improve fish and wildlife habitat, as well as those intended for other purposes (e.g., water quality improvement), affect various aquatic and terrestrial fauna"--Abstract.
Download or read book A Mathematical Model of Nitrogen Dynamics in a Flooded Rice soil System and the Study of Mineralization of Nitrogen from Soil Biomass Algae Residue and Senesced Leaf Tissue written by Xinli Liu and published by . This book was released on 1993 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil and Fertilizers written by Rattan Lal and published by CRC Press. This book was released on 2020-05-06 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil and Fertilizers: Managing the Environmental Footprint presents strategies to improve soil health by reducing the rate of fertilizer input while maintaining high agronomic yields. It is estimated that fertilizer use supported nearly half of global births in 2008. In a context of potential food insecurity exacerbated by population growth and climate change, the importance of fertilizers in sustaining the agronomic production is clear. However, excessive use of chemical fertilizers poses serious risks both to the environment and to human health. Highlighting a tenfold increase in global fertilizer consumption between 2002 and 2016, the book explains the effects on the quality of soil, water, air and biota from overuse of chemical fertilizers. Written by an interdisciplinary author team, this book presents methods for enhancing the efficiency of fertilizer use and outlines agricultural practices that can reduce the environmental footprint. Features: Includes a thorough literature review on the agronomic and environmental impact of fertilizer, from degradation of ecosystems to the eutrophication of drinking water Devotes specific chapters to enhancing the use efficiency and effectiveness of the fertilizers through improved formulations, time and mode of application, and the use of precision farming technology Reveals geographic variation in fertilizer consumption volume by presenting case studies for specific countries and regions, including India and Africa Discusses the pros and cons of organic vs. chemical fertilizers, innovative technologies including nuclear energy, and the U.N.’s Sustainable Development Goals Part of the Advances in Soil Sciences series, this solutions-focused volume will appeal to soil scientists, environmental scientists and agricultural engineers.
Download or read book Optimizing Nitrogen Management to Achieve Agronomic and Environmental Goals in Rice Production written by Cameron Mark Pittelkow and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Optimizing nitrogen (N) management is a critical component of meeting yield potential and increasing global food supply while reducing environmental impacts from agriculture. The objective of this dissertation was to evaluate N management practices in conventional and alternative direct-seeded rice production systems in California in order to enhance rice productivity while minimizing environmental costs, particularly concerning greenhouse gas (GHG) emissions. In Chapter 2, agronomic productivity and N requirements of resource-conserving rice establishment systems utilizing no-till stale seedbed practices for improved weed control were assessed. Without N fertilizer addition, yields were lower for alternative compared to conventional establishment systems, likely as a result of greater soil N losses. Accordingly, economic optimum nitrogen rates based on yield response to N trials indicated an additional 30 to 35 kg N ha−1 was needed to maximize returns to N in water-seeded stale seedbed systems. These results suggest that alternative establishment systems are viable from an agronomic and economic standpoint in California provided N rates are close to optimal and establishment methods are selected to target weed species of concern. In Chapters 3 and 4, the relationship between N management, crop productivity, and GHG emissions was investigated. Integrating climate change and agronomic productivity concerns, global warming potential was assessed on a yield-scaled as well as per unit area basis. It was hypothesized that in response to fertilizer N addition, yield-scaled global warming potential would be minimized at N rates that maximize yields. In a two-year on-farm experiment in water-seeded rice (Chapter 3), N2O emissions remained low regardless of N rate when a permanent flood was maintained but large N2O fluxes occurred during discrete field drainage periods prior to harvest, particularly at high N rates. In contrast, differences were not observed between N rates for CH4 emissions. Across years CH4 represented 94% of total global warming potential, thus mean annual yield-scaled global warming potential significantly decreased at optimal N rates due to increasing yields. In Chapter 4, these field results were combined with available data from the literature to evaluate yield-scaled global warming potential as a function of yield N surplus, here defined as N application rate minus the N rate at which maximum yield was achieved within each study. At surplus N rates, N2O and yield-scaled N2O emissions increased exponentially. However, CH4 emissions were not impacted by N inputs, hence yield-scaled CH4 emissions decreased with N addition. Overall, yield-scaled global warming potential was minimized at optimal N rates, decreasing by 21% compared to treatments without N addition. Balancing gains in agricultural productivity with environmental concerns, this work supports the concept that high rice yields can be achieved with minimal yield-scaled global warming potential when N inputs are closely matched with crop demand.
Download or read book World Rice Statistics 1990 written by and published by Int. Rice Res. Inst.. This book was released on 1991 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rice production, area, and yield; Imports and exports; Food aida; Consumption and stocks; Domestic prices; World prices and tariff and nontariff measures; Land use, irrigation, and farm size; Population, labor force, and wages; Modern rice varieties; Fertilizer use and prices; Rice costs and returns.
Download or read book Principles and Practices of Rice Production written by Surajit K. De Datta and published by Int. Rice Res. Inst.. This book was released on 1981 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Organic Matter and Rice written by and published by Int. Rice Res. Inst.. This book was released on 1984 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Organic Carbon written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2018-07-18 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: The publication was launched at the Global Symposium on Soil Organic Carbon (GSOC) held at FAO headquarters (Rome, 21-23 March 2017). It provides an overview to decision-makers and practitioners of the main scientific facts and information regarding the current knowledge and knowledge gaps on Soil Organic Carbon. It highlights how better information and good practices may be implemented to support ending hunger, adapting to and mitigating climate change and achieving overall sustainable development.
Download or read book Water Management in Irrigated Rice written by B. A. M. Bouman and published by Int. Rice Res. Inst.. This book was released on 2007 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rice written by and published by Int. Rice Res. Inst.. This book was released on 2007 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Green Manure Production Systems for Asian Ricelands written by Jagdish Kumar Ladha and published by Int. Rice Res. Inst.. This book was released on 1994 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected papers from a symposium held as part of the 1992 International Rice Research Conference.
