02117naa a2200241 a 450000100080000000500110000800800410001902400350006010000180009524501470011326000090026052013650026965000160163465300190165065300190166965300260168870000180171470000180173270000230175070000220177370000160179577300640181119738052022-10-20       2013    bl uuuu     u00u1 u    #d7 a10.1007/s10457-013-9641-x2DOI1 aJOSLIN, A. H.  aSoil and plant N-budget 1 year after planting of a slash-and-mulch agroforestry system in the eastern Amazon of Brazil.h[electronic resource]  c2013  aNutrient losses during slash-and-burn clearing in tropical forests, coupled with demand by food crops, can deplete nutrients and result in crop abandonment after 1?2 years. Slash-and-mulch technology prevents nutrient losses from burning, while mulch decomposition may serve as a nutrient source. This research investigates the release of nutrients from the mulch and potential uptake of released N by plant biomass after a multi-species agroforestry system was planted in June 2005, following the clearing of a 1 ha of 7-year-old forest with a mulching tractor in Igarapé Açu, Brazil. The study evaluated soil conditions, mulch decomposition, and nutrient concentrations of Manihot esculenta and native vegetation under treatments of P+K fertilization in combination with four native tree species and N-fixing Inga edulis, or with three native tree species without I. edulis. Mulch layer N, Ca and Mg content decreased in response to fertilization, while mulch layer P and K content increased. Nutrient content increased in M. esculenta stems and tubers with fertilization and in the presence of I. edulis, and in competing vegetation with fertilization. Estimated tree N content increased 311 % with fertilization, but by 154 % in the presence of I. edulis. Fertilization with P+K, as well as the presence of I. edulis, increased N stocks in total biomass.  aNitrogênio  aFertilização  aQueima e corte  aSistema agroflorestal1 aMARKEWITZ, D.1 aMORRIS, L. A.1 aOLIVEIRA, F. de A.1 aFIGUEIREDO, R. O.1 aKATO, O. R.  tAgroforestry Systemsgv. 87, n. 6, p. 1339-1349, Dec. 2013.