Competition in tree row agroforestry systems. 2. Distribution, dynamics and uptake of soil inorganic N
作者： S.J. Livesley , P.J. Gregory , R.J. Buresh
关键词: Ammonium 、 Nutrient 、 Oxisol 、 Agroforestry 、 Senna 、 Grevillea 、 Nitrate 、 Senna spectabilis 、 Grevillea robusta 、 Agronomy 、 Biology
摘要: The effect of tree row species on the distribution soil inorganic N and biomass growth uptake trees crops was investigated beneath a Grevillea robustaA. Cunn. ex R. Br. (grevillea) Senna spectabilisDC. (senna) hedgerow grown with Zea mays L. (maize) sole maize crop, during one cropping season. hypothesis that large nutrient would have greater competitive upon coexisting plants than takes up less internally cycles nutrients. field study conducted kaolinitic Oxisol in sub-humid highlands western Kenya. Soil nitrate ammonium were measured to 300 cm depth 525 distance from rows, before after cropping. Ammonium concentrations small did not change significantly There > 8 mg kg−1 upper 60 at 90–180 start season, except within senna where smaller. During grevillea-maize system only decreased cm, whereas almost every hedgerow. Inorganic (nitrate plus ammonium) by 94 kg ha−1 senna-maize 33 system.
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