BRIENZA JUNIOR, S.

MARQUES, U. M. F

VIELHAUER, K.

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Influence of fallow enrichment with different leguminous tree species and of land preparation methods on following crop production.

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No. 77Influence of fallow enrichment with difTerent leguminous tree species and of landpreparation methods on following crop productionAuthors: Vielhauer, Konrad (1), Marques, Urbano Marcelo Felipe (2) and Brienza Jr., S. (2)Institutions: (I) ZEF, Universitât Bonn, Bonn, Deutschland (2) Embrapa Amazônia Oriental, Belém, PA, BrasilContent of Abstract:One of the technologies utilízed by the project SHIFT Capoeira to improve the fallow of the shifting cultivationsystems of the Eastern Amazon is enrichment plantings with fast growing tree legumes during the fallow period.Together with the faster accumulation of biomass higher nutrient uptake rates out of deep soil layers and netnitrogen input by biological nitrogen fixation are expected. In an experiment conducted with five tree legumespecies (Acacia angustissima, Acacia mangium, Inga edulis, Clitoria racemosa, Sclerolobium paniculatum) at ithree planting densities (1סס00, 5000, 2500 trees ha') the effect on yields of the following crops was studied tversus the non enriched control as well as in two types of land preparation (slash-and-burn and slash-and-muIch).Before cropping the faIJow vegetation and the enrichment trees were slashed and chopped to form a muIch layerin four of the experimental blocks. The fifth block was submitted to the traditional slashing and burning. Maizewas planted shortly after land preparation and cassava was intercropped with the maize after four weeks of maizeplanting. A moderate fertilizer dose of N, P, and K, at 30, 60, 30 kg ha", respectively was applied. With about i3.6 t ha" the maize grain yield was three fold the regional average and with about 20 t ha' the cassava tuber yield !doubled the regional average. Enrichment increased both the maize and the cassava yields under fire-free landpreparation and reduced them under slash-and-buni. This might be an indication that enrichment can actadversely, if combined with the traditional slash-and-burn land preparation, which possibly is due to the higheramount of nutrients extracted from the soil by the enrichment trees, lacking afterwards when they are beingemitted to the atmosphere by burning.Poster section 4

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Influence of fallow enrichment with different leguminous tree species and of land preparation methods on following crop production.

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