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By John E. Beringer (auth.), C. Veeger, W. E. Newton (eds.)

ISBN-10: 9400969236

ISBN-13: 9789400969230

ISBN-10: 9400969252

ISBN-13: 9789400969254

As for the previous 4 overseas Symposia on Nitrogen Fixation, held in Pullman, Washington united states (1974); Salamanca, Spain (1976); Madison, Wisconsin, united states (1978); and Canberra, Australia (1980), the fifth Symposium held from August 28 - September three, 1983 in Noordwijkerhout, The Netherlands, bought the gene­ rous aid of the Charles F. Kettering beginning learn Laboratory and the Tennessee Valley Authority. This aid has helped study development during this extensive box of technological know-how via delivering a discussion board either for the alternate of rules and for medical precis and dialogue as captured over the past 10 years in all of the 4 books released formerly. even though all earlier conferences have been good attended, the current convention was once the biggest thus far. 550 scien­ tists from 60 assorted nations attended the "Leeuwenhorst Conference", re­ featuring the numerous diverse disciplines actively interested by examine during this box: chemists, biochemists, molecular biologists, geneticists, microbiologists, plant physiologists, agriculturalists. plenty of them needed to battle through a tough interval to elevate the required money to wait. additionally, a parallel assembly of "policymakers" from Southeast Asia, Africa and South the USA used to be held lower than the auspices of Crosscurrents overseas Institute, Dayton, OR, united states and the United international locations collage, Tokyo, Japan. those individuals attended many of the clinical classes to learn from the imaginative and prescient of a few scientists on the symposium.

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Extra resources for Advances in Nitrogen Fixation Research: Proceedings of the 5th International Symposium on Nitrogen Fixation, Noordwijkerhout, The Netherlands, August 28 – September 3, 1983

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Figures 1 and 2 depict these relationships for cv. Marri in 1980 and for cv. Illyarrie in 1981 respectively. Although diurnal variation occurred in sA, sH and sN, no diurnal variation was evident in either the AIN or R/N ratios or in the relative efficiency of nitrogen fixation (defined as I-RIA). Measurements of plant and nodule growth rates indicated that low A/N and H/N ratios occurred when the growth of nodules did not keep pace with the demand for nitrogen by the plant. The results are consistent with the hypothesis that a change occurs in the substrate kinetics of nitrogenase during periods of high sN, pre-disposing the enzyme more to the reduction of N2 than to the reduction of either R+ or C2R2' 16 24 a a Figure 1 Figure 2 12 o 16 x "0 o C «en Ol ~ (j) 0.

Hopmans P, Chalk PM and Douglas LA (1983) Plant Soil (in press) Hopmans P, Douglas LA and Chalk PM (1982) Soil BioI. Biochem. 14, 495-500. Hudd CA, Lloyd-Jones CP and Hill-Cottingham DG (1980) Physiol. Plant. 48, 111-115. Saito SMT, Matsui E and Salati E (1980) Physiol. Plant. 49, 37-42. 37 NITROGENASE (C 2H2 ) ACTIVITY OF FINNISH FORAGE LEGUMES ~ SITU KRISTINA LINDSTR~M DEPARTMENT OF MICROBIOLOGY, UNIVERSITY OF HELSINKI SF-00710 HELSINKI 71, FINLAND 1. INTRODUCTION In order to give consist ant yields despite weather fluctuations, nitrogen fixing agricultural plants should perform well under a wide range of environmental conditions.

The sampling procedures involved are simple, but the nitrogen isotope analysis is costly. It is of great interest if other chemical characteristics, which are less expensive to analyse, could be used as alternatives. A pilot study was therefore carried out to test if the foliar 15 N abundance, N content and N:P ratio of presumed nitrogen-fixing tree species differed from that of non-nitrogen-fixing species. Three potentially nodulated legume species were compared with three non-nodulated legume species and one non-legume species.

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Advances in Nitrogen Fixation Research: Proceedings of the 5th International Symposium on Nitrogen Fixation, Noordwijkerhout, The Netherlands, August 28 – September 3, 1983 by John E. Beringer (auth.), C. Veeger, W. E. Newton (eds.)


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