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Books > Earth & environment > Earth sciences > Geology & the lithosphere > Soil science, sedimentology
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Management of Biological Nitrogen Fixation for the Development of More Productive and Sustainable Agricultural Systems - Extended versions of papers presented at the Symposium on Biological Nitrogen Fixation for Sustainable Agriculture at the 15th Congress of Soil Science, Acapulco, Mexico, 1994 (Hardcover, Reprinted from PLANT AND SOIL; 174:1-2, 1995)
Loot Price: R4,355
Discovery Miles 43 550
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Management of Biological Nitrogen Fixation for the Development of More Productive and Sustainable Agricultural Systems - Extended versions of papers presented at the Symposium on Biological Nitrogen Fixation for Sustainable Agriculture at the 15th Congress of Soil Science, Acapulco, Mexico, 1994 (Hardcover, Reprinted from PLANT AND SOIL; 174:1-2, 1995)
Series: Developments in Plant and Soil Sciences, 65
Expected to ship within 12 - 17 working days
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The subsistence agriculture of the pre-chemical era efficiently
sustained the nitrogen status of soils by maintaining a balance
between N loss and N gain from biological nitrogen fixation (BNF):
the microbial conversion of atmospheric N to a form usable by
plants. This was possible with less intensive cropping, adaptation
of rational crop rotations and intercropping schemes, and the use
of legumes as green manure. Modern agriculture concentrates on
maximum output, however, overlooking input efficiency; It is not
sustainable. Intensive monocropping, with no or inadequate crop
rotations or green manuring, together with the excessive use of
chemical N fertilizers, results in an imbalance between N gain and
N loss. The losses are often larger than the gains, and soil N
status declines. The challenge is to sustain soil N fertility in
many different tropical and temperate farming systems operating at
high productivity levels. This requires judicious integration of
BNF components, maintaining a good balance between N losses and
gains. In this book, papers on BNF in crop forage and tree legumes
are augmented with discussions of integrated farming systems
involving BNF, soil and N management, and recycling of legume
residues. BNF by non-legumes are discussed, and attempts to
transform cereals into nodulating plants are critically reviewed.
Advances in the development of novel methodologies to understand
symbiotic relations and to assess N2 fixation in the field are
described, and means are presented to enhance BNF through plant and
soil management or breeding and selection. Problems encountered in
exploiting BNF under field conditions are examined, as are
promising approaches to improving BNFexploitation.
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