Development of a Procedure for Determining the Effect of Selection on Improvement of Nitrogen-fixing Ability of Alfalfa (Medicago Sativa L.) PDF Download
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Author: Patrick Michael Duhigg
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 108
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Author: Patrick Michael Duhigg
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 108
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 28
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Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 636
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Author: Kathleen Ann Fishbeck
Publisher:
ISBN:
Category :
Languages : en
Pages : 162
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Author: Nicholas Ray Degenhart
Publisher:
ISBN:
Category :
Languages : en
Pages : 160
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Author: Intermountain Forest and Range Experiment Station (Ogden, Utah)
Publisher:
ISBN:
Category : Mines and mineral resources
Languages : en
Pages : 28
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Author: Walter E. Cole
Publisher:
ISBN:
Category : Conifers
Languages : en
Pages : 636
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Author: Philip E. Shuler
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 170
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The usefulness of preplant nitrogen (N) in establishing alfalfa in colder production areas has not been well characterized. This study was conducted to determine the effect of preplant N and soil temperature on yield, percent N derived from biological nitrogen fixation (PBNF), and shoot N concentration in alfalfa (Medicago sativa L. cv. 'Vernema'. Field experiments were conducted in 1987 and 1988 at Powell Butte, OR, to determine the effect of five levels of preplant N (0, 10, 20, 40, 60 kg ha−1) on yield and shoot N concentration of alfalfa. Growth chamber experiments were conducted from 1989 through 1991 to examine the effect of five levels of preplant N (0, 10, 20, 40, 80 kg ha−1) and three day/ - night soil temperatures (18/12°C, 24/16°C, 27/21°C) on yield, PBNF, and shoot N concentration of alfalfa. In field experiments, preplant N had no effect on shoot N concentration in either year. In 1987 there was no effect of preplant N on dry matter yield. Application of 20-40 kg N ha−1 preplant N increased dry matter yield in 1988. In growth chamber experiments, the highest rate of dry matter accumulation occurred at a soil temperature of 24/16°C. At 18/12°C and 24/16°C, 40 kg ha−1 preplant N resulted in increased shoot and root dry matter yield. At 18/12°C, 80 kg ha-1 preplant N increased PBNF 14% relative to the zero N control. There was no effect of preplant N on PBNF in plants grown at 24/16°C and 27/- 21°C. The rates of shoot N accumulation were similar at 18/12°C and 24/16°C, and were higher than at 27/21°C. Shoot N concentration was not affected by preplant N treatments. The use of 20-40 kg ha−1 preplant N may result in increased yield without decreasing PBNF when: 1) soil temperature remains below 15°C for at least two weeks after planting, and 2) soil nitrate level is less than 16 mg kg−1. Proper assessment of the use of preplant N in alfalfa establishment requires a careful consideration of both soil temperature and soil N availability.
Author: National Academies of Sciences, Engineering, and Medicine
Publisher: National Academies Press
ISBN: 0309437385
Category : Science
Languages : en
Pages : 607
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Book Description
Genetically engineered (GE) crops were first introduced commercially in the 1990s. After two decades of production, some groups and individuals remain critical of the technology based on their concerns about possible adverse effects on human health, the environment, and ethical considerations. At the same time, others are concerned that the technology is not reaching its potential to improve human health and the environment because of stringent regulations and reduced public funding to develop products offering more benefits to society. While the debate about these and other questions related to the genetic engineering techniques of the first 20 years goes on, emerging genetic-engineering technologies are adding new complexities to the conversation. Genetically Engineered Crops builds on previous related Academies reports published between 1987 and 2010 by undertaking a retrospective examination of the purported positive and adverse effects of GE crops and to anticipate what emerging genetic-engineering technologies hold for the future. This report indicates where there are uncertainties about the economic, agronomic, health, safety, or other impacts of GE crops and food, and makes recommendations to fill gaps in safety assessments, increase regulatory clarity, and improve innovations in and access to GE technology.
Author: David L. Hoffman
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 60
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