Record Details

Cereal Nitrogen Fixation: Problems and Potentialities

OAR@ICRISAT

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Relation http://oar.icrisat.org/3603/
 
Title Cereal Nitrogen Fixation: Problems and Potentialities
 
Creator Wani, S P
 
Subject Millets
Sorghum
 
Description Estimates of nonsymbiotic and associative nitrogen fixation indicate that nitrogen fixation
occurs at magnitudes that may be of agronomic significance.
Long-term N balances for crop production, although difficult to measure, are necessary for
estimating the amounts of N2 fixed. Techniques using 15N directly to measure nitrogen fixation
and problems involved in employing these techniques are discussed. Acetylene-reduction assays
(ARA) are very sensitive but there are limitations to their use in quantification of nitrogen
fixation as well as infield studies.
Current understanding about the source of energy for cereal nitrogen fixation and the effect of
light, temperature, soil moisture, plant genotype, plant age, and combined nitrogen on nitrogen
fixation is illustrated with examples. Possibilities of improving the ability of cereals to support
nitrogen fixation through plant breeding are discussed.
Types of bacteria involved and methods used to isolate, count, and test their nitrogenase
activity influence the results of such studies. Problems associated with selecting bacteria for field
studies, their performance, and mode of benefiting crops from inoculations are discussed. Future
areas of work are highlighted.
 
Date 1986
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/3603/1/CerealNitrogenFixation7-21.pdf
Wani, S P (1986) Cereal Nitrogen Fixation: Problems and Potentialities. In: Cereal nitrogen fixation. Proceedings of the Working, 9-12 Oct 1984, ICRISAT Center, Patancheru, India.