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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

  • Editors
  • J. K. Ladha
  • M. B. Peoples

Part of the Developments in Plant and Soil Sciences book series (DPSS, volume 65)

Table of contents

  1. Front Matter
    Pages i-vii
  2. D. F. Herridge, S. K. A. Danso
    Pages 51-82
  3. M. B. Peoples, J. K. Ladha, D. F. Herridge
    Pages 83-101
  4. R. M. Boddey, O. C. de Oliveira, S. Urquiaga, V. M. Reis, F. L. de Olivares, V. L. D. Baldani et al.
    Pages 195-209
  5. Kate J. Wilson, Mark B. Peoples, Richard A. Jefferson
    Pages 241-253
  6. Back Matter
    Pages 287-291

About this book

Introduction

Table 1. Global allocation of arable land between different com­ modities Globally, cereal cropping dominates cultivated land Commodities' Proportion of land area use (around 50% of total area, Table I). The remain­ (%) ing arable land is used for production of oilseed, fibre, or food and cash crops. In addition, vast areas are Cereals maintained under temporary or permanent pasture for Wheat 16 forage production (2-3 fold greater than the total area Rice 10 under cultivation and permanent crop; Table 1, Fig. Maize 9 O. All cultivated crops, except for legumes (pulses All other cereals 13 and legume oilseeds) require the soil to provide rel­ Total 48 atively large amounts of nitrogen (N). It is necessary for the three most important cereals, wheat (Triticum Legumes aestivum), rice (Oryza sativa) and maize (Zea mays), Legume pulses 5 1 to take up 20 to 40 kg soil N ha- over a period of 3 Legume oilseeds 6 to 5 months to satisfy the N requirements of the seed and supporting vegetative structure for each tonne of Total II grain produced (e. g. Fig. 2; Myers, 1988). Produc­ tive pastures on the other hand may assimilate> 100 Other crops kg N ha -\ each annum, of which 50 to 90% will be Other oilseeds 6 consumed by livestock in intensively grazed systems Beverages I Tobacco 7 (Ledgardy, 1991; Thomas, 1995).

Keywords

Flora bacteria cyclin nitrogen recycling residue residues soil

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