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Use of isotopes for increasing biological nitrogen fixation and yield of pastures. Final report for the period 1 March 1991 - 28 February 1992

Technical Report:

Abstract

The N-15 natural abundance and N-15 isotope dilution (ID) methods for measuring dinitrogen fixation and nitrogen transfer in alfalfa and alfalfa intercropped with meadow fescue were compared in three experiments. Although both methods gave essentially the same estimates the precision of the values obtained differed, and values obtained by the isotope dilution method were more precise. Similarly, the N-15 natural abundance method was not very suitable for detecting N transfer from legume to non-legume. Greater amounts of N transfer were detected by the ID method, and with a greater precision. Mixed cropping sometimes gave slight to high increases in % nitrogen fixation compared to alfalfa cropped alone. On the whole alfalfa was found to be a high nitrogen fixer, with fixation values from the second harvest onwards almost always greater than 80% and often close to 100%. 23 refs, 30 tabs.
Authors:
Yunyin, Yao [1] 
  1. Chinese Academy of Agricultural Sciences, Beijing (China). Inst. for Application of Atomic Energy
Publication Date:
May 01, 1992
Product Type:
Technical Report
Report Number:
IAEA-R-5901-F
Reference Number:
SCA: 553002; PA: AIX-24:000968; SN: 93000912973
Resource Relation:
Other Information: PBD: May 1992
Subject:
60 APPLIED LIFE SCIENCES; ALFALFA; NITROGEN FIXATION; COMPARATIVE EVALUATIONS; EXPERIMENTAL DATA; FERTILIZERS; GRAMINEAE; ISOTOPE DILUTION; NITROGEN 15; PLANT GROWTH; RHIZOBIUM; SOILS; 553002; HORTICULTURE
OSTI ID:
10108711
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ON: DE93609185; TRN: XA9232925000968
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
[50] p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Yunyin, Yao. Use of isotopes for increasing biological nitrogen fixation and yield of pastures. Final report for the period 1 March 1991 - 28 February 1992. IAEA: N. p., 1992. Web.
Yunyin, Yao. Use of isotopes for increasing biological nitrogen fixation and yield of pastures. Final report for the period 1 March 1991 - 28 February 1992. IAEA.
Yunyin, Yao. 1992. "Use of isotopes for increasing biological nitrogen fixation and yield of pastures. Final report for the period 1 March 1991 - 28 February 1992." IAEA.
@misc{etde_10108711,
title = {Use of isotopes for increasing biological nitrogen fixation and yield of pastures. Final report for the period 1 March 1991 - 28 February 1992}
author = {Yunyin, Yao}
abstractNote = {The N-15 natural abundance and N-15 isotope dilution (ID) methods for measuring dinitrogen fixation and nitrogen transfer in alfalfa and alfalfa intercropped with meadow fescue were compared in three experiments. Although both methods gave essentially the same estimates the precision of the values obtained differed, and values obtained by the isotope dilution method were more precise. Similarly, the N-15 natural abundance method was not very suitable for detecting N transfer from legume to non-legume. Greater amounts of N transfer were detected by the ID method, and with a greater precision. Mixed cropping sometimes gave slight to high increases in % nitrogen fixation compared to alfalfa cropped alone. On the whole alfalfa was found to be a high nitrogen fixer, with fixation values from the second harvest onwards almost always greater than 80% and often close to 100%. 23 refs, 30 tabs.}
place = {IAEA}
year = {1992}
month = {May}
}