02796nam a2200553 a 450000100080000000500110000800800410001910000270006024501340008726001890022130000120041052011640042265000170158665000210160365000120162465000220163665000220165865000210168065000180170165000200171965000220173965000090176165000190177065000260178965000210181565000130183665000130184965000290186265000290189165000100192065000120193065000150194265000260195765000120198365000160199565000230201165000270203465300170206165300130207865300240209165300110211565300220212665300170214865300110216565300250217665300100220170000160221170000150222716699692019-01-28       2000    bl uuuu     u00u1 u    #d1 aSILVA JUNIOR, J. P. da  aPueraria phaseoloides as a cover crop in agroforestry systems in the humid tropicsbgrowth, nutrition and biological N2 fixation.  aIn: INTERNATIONAL CONGRESS ON NITROGEN FIXATION, 12., 1999, Foz do Iguaçu. Nitrogen fixation: from molecules to crop productivity - proceedings. Dordrecht: Kluwer Academic Pressc2000  ap. 563.  aAnalyse of the biomassa production and nutrition of pueraria as a cover crop grown in three different agroforestry systems (1- cupuacu, pupunha e seringueira; 2- cupuacu, pupunha, castanha-do-Para, urucu; and 3- cupuacu, seringueira, coco, citros) at two levels of fertilisation, and its potential to contribute to the N stocks of the cropping system by biological N2 fixation (NBF), in a Xanthic Farreasol in Manaus-AM (Brasil). With the exception of K, the nutrients stocks in pueraria litterwere more than twice as high as the nutrients applied by fertilisation. consequently, nutrient turnover of pueraria was an important process in the nutrient cycling of the fruit tree production system. The N in pueraria derived from biological N2 fixation estimated by 15N enrichment reached values from 9% to 45% and was higher throughout the wet than the dry season. Thus, 32-158 Kg N ha-1 of the biomass N were derived from atmospheric N2 exceeding the amounts of N added by fertilisation. The larger nutrient uptake and return through litter indicated a rapid nutrient cycling and plant-topsoil interface, thus reducing leaching and keeping nutrients available.  aagroforestry  acropping systems  alegumes  amultiple cropping  asoil conservation  aBactris Gasipaes  aBixa Orellana  aCitrus Sinensis  aCobertura do Solo  aCoco  aCocos Nucifera  aConservação do Solo  aCultivo Multiplo  aCupuaçu  aEspécie  aFixação de Nitrogênio  aFloresta Tropical Úmida  aHevea  aLaranja  aLeguminosa  aPueraria Phaseoloides  aPupunha  aSeringueira  aSistema de Cultivo  aTheobroma Grandiflorum  aAgrofloresta  aAmazonas  aBertolletia excelsa  aBrasil  aCastranha do Para  aCover plants  aManaus  aTropical rain forest  aUrucu1 aLEHMANN, J.1 aLOZADA, N.