Agronomic benefits of rhizobial inoculant use over nitrogen fertilizer application in tropical soybean

Bantilan, 1995, Research evaluation and impact analysis of biological nitrogen-fixation, Plant Soil, 174, 279, 10.1007/BF00032252 Board, 1994, Radiation-use efficiency in relation to row spacing for late-planted soybean, Field Crops Res., 36, 13, 10.1016/0378-4290(94)90048-5 Bremner, 1995, Recent research on problems in the use of urea as a nitrogen fertilizer, Fert. Res., 42, 321, 10.1007/BF00750524 Bullock, 1998, Soybean yield response to narrow rows is largely due to enhanced early growth, Crop Sci., 38, 1011, 10.2135/cropsci1998.0011183X003800040021x Crop recommendations technoguide, 1990. Department of Agriculture, Ministry of Agricultural Development and Research, Peradeniya, Sri Lanka. Domros, M., 1974. The Agroclimate of Ceylon. Franz Steiner Verlag GmbH, Wiesbaden. Giller, 1995, Future benefits from biological nitrogen-fixation: an ecological approach to agriculture, Plant Soil, 174, 255, 10.1007/BF00032251 Graham, P.H., Vance, C.P., 2000a. Nitrogen-fixation in perspective: an overview of research and extension needs. In: Graham, P.H. (Ed.), Applied Technologies in Biological Nitrogen-Fixation, Field Crops Res., Vol. 65, pp. 93–106. Graham, P.H., Vance, C.P., 2000b. Introduction. In: Graham, P.H. (Ed.), Applied Technologies in Biological Nitrogen-Fixation. Field Crops Res., Vol. 65, pp. 91. Hardarson, G., Danso, S.K.A., 1990. Use of 15N methodology to assess biological nitrogen-fixation. In: Hardarson, G. (Ed.), Use of nuclear techniques in studies of soil–plant relationships. International Atomic Energy Agency, Vienna, pp. 129–160. Jahaveri, F., Joshi, J., 1987. Soybean production by small scale farmers in Zambia. In: Cole, D.L. (Ed.), Soybeans in Southern Africa. University of Zimbabwe, Harare, pp. 9–12. Keyser, 1992, Potential for increasing biological nitrogen-fixation in soybean, Plant Soil, 141, 119, 10.1007/BF00011313 Peoples, 1995, Biological nitrogen-fixation: an efficient source of nitrogen for sustainable agricultural production, Plant Soil, 174, 3, 10.1007/BF00032239 SAS, 1998. SAS-STAT guide for personal computers, Ver. 6. Statistical Analysis Systems Institute Inc., Cary, NC. Seneviratne, G., Van Holm, L.H.J., Ekanayake, E.M.H.G.S., 1999. Effect of peat and coir dust-based rhizobial inoculants on the nodulation, plant growth and yield of soybean (Glycine max [L.] Merill) cv PB 1. Trop. Agric. Res. Ext. 2, 136–139. Taylor, 1982, Responses of soybeans to two row spacings and two soil water levels. I. An analysis of biomass accumulation, canopy development, solar radiation interception and components of seed yield, Field Crops Res., 5, 1, 10.1016/0378-4290(82)90002-8 Vollmann, 2000, Spatial field variations in soybean (Glycine max [L.] Merr.) performance trials affect agronomic characters and seed composition, Eur. J. Agron., 12, 13, 10.1016/S1161-0301(99)00042-8 Wani, 1995, Sustainable agriculture in the semi-arid tropics through biological nitrogen-fixation in grain legumes, Plant Soil, 174, 29, 10.1007/BF00032240