Seasonal fluctuations of native available N and soil management implications M. T. F. WongS. Nortcliff OriginalPaper Pages: 13 - 26
Effect of cultivation on the nitrogen fertility of selected agro-ecosystems in South Africa C. C. du PreezM. E. du Toit OriginalPaper Pages: 27 - 32
High productivity analysis of15N and13C in soil/plant research A. BarrieS. T. BrookesS. Debney OriginalPaper Pages: 43 - 59
Adapting the potentially mineralizable N concept for the prediction of fertilizer N requirements C. A. CampbellY. W. JameM. L. Cabrera OriginalPaper Pages: 61 - 75
Field application of the15N isotope dilution technique for the reliable quantification of plant-associated biological nitrogen fixation Robert M. BoddeyOctávio C. de OliveiraSegundo Urquiaga OriginalPaper Pages: 77 - 87
Rational nitrogen fertilization in intensive cropping systems Charles W. RiceJohn L. HavlinJames S. Schepers OriginalPaper Pages: 89 - 97
Nitrogen assimilation by legumes - processes and ecological limitations S. Schubert OriginalPaper Pages: 99 - 107
Fate of CO(NH2)2-15N applied to taro (Colocasia esculenta var.esculenta) in an acid Vertisol of Trinidad N. RamnananN. AhmadS. M. Griffith OriginalPaper Pages: 109 - 115
Brown leaf spot disease and fertilizer interaction in irrigated rice growing on different soil types R. H. PhelpsC. R. Shand OriginalPaper Pages: 117 - 121
Use of15N for fertilizer N recovery and N mineralization studies in semi-arid Kenya C. J. PilbeamG. P. Warren OriginalPaper Pages: 123 - 128
Significance of timing and method of N fertilizer application for the N-use efficiency in flooded tropical rice H. F. Schnier OriginalPaper Pages: 129 - 138
A conceptual assessment of the importance of denitrification as a source of soil nitrogen loss in tropical agro-ecosystems Peter M Groffman OriginalPaper Pages: 139 - 148
Soil, plant and atmospheric conditions as they relate to ammonia volatilization R. R. SharpeL. A. Harper OriginalPaper Pages: 149 - 158
Nitrous oxide (N2O) emissions from soils in warm climates Tom GranliOluf Chr Bøckman OriginalPaper Pages: 159 - 163
The role ofAzolla in curbing ammonia volatilization from flooded rice systems Paul L. G. VlekMoussa Y. DiakiteHenning Mueller OriginalPaper Pages: 165 - 174
Downward movement of nitrate and ammonium nitrogen in a flatland ultisol Fredericka M. DeareN. AhmadT. U. Ferguson OriginalPaper Pages: 175 - 184
15N isotope dilution techniques to study soil nitrogen transformations and plant uptake D. Barraclough OriginalPaper Pages: 185 - 192
Urea-N uptake by dasheen (Colocasia esculenta L. Schott) in relation to the fertilizer placement method Gregory A. GouveiaNazeer AhmadSelwyn M. Griffith OriginalPaper Pages: 205 - 214
Nitrogen fixation by trees in relation to soil nitrogen economy Y. R. Dommergues OriginalPaper Pages: 215 - 230
Extension of symbiotic biological nitrogen fixation technology in developing countries D. H. Hubbell OriginalPaper Pages: 231 - 239
Nitrogen fixation associated with grasses and cereals: Recent progress and perspectives for the future Robert M. BoddeyJohanna Dobereiner OriginalPaper Pages: 241 - 250
Recent developments on the use of urease inhibitors in the tropics B. H. ByrnesJ. R. Freney OriginalPaper Pages: 251 - 259
Biological N2-fixation and its management in wetland rice cultivation P. A. Roger OriginalPaper Pages: 261 - 276
Managing nitrogen for sustainable crop production C. A. CampbellR. J. K. MyersD. Curtin OriginalPaper Pages: 277 - 296
Searching for criteria for the selection of efficient tree species for fallow improvement, with special reference to carbon and nitrogen Götz SchrothDorothee KolbeWolfgang Zech OriginalPaper Pages: 297 - 314
Nitrogen balance and root behavior in four pigeonpea-based intercropping systems K. KatayamaO. ItoK. K. Lee OriginalPaper Pages: 315 - 319
Recent research on problems in the use of urea as a nitrogen fertilizer J. M. Bremner OriginalPaper Pages: 321 - 329
Nitrate contamination of groundwater: Measurement and prediction M. J. GossD. Goorahoo OriginalPaper Pages: 331 - 338
Alternatives for nitrogen nutrition of crops in tropical agriculture Johanna DobereinerSegundo UrquiagaRobert M. Boddey OriginalPaper Pages: 339 - 346
