The main objective was to study the fertilizer effects on P, K, Ca e Mg contents in mixed tree cropping system with Brazil nut (Bertholletia excelsa), cupuaçu (Theobroma grandiflorum), peach palm (Bactris gasipaes), annatto (Bixa orellana) and pueraria (Pueraria phaseoloides)

LEHMANN, J.

MOTA, M. do S.

SCHROTH, G.

English

Repository Open Access to Scientific Information from Embrapa

Gerrnan-Brazilian Workshop on Neotropical Ecosysterns - Achievements and Prospects of Cooperative ResearchHarnburg, September 3-8, 2000Biotic and Abiotic Interactions in Soil and Sediment - Summaries of Posters, Session 2Fertilization Effects on SoUP, K, Ca and Mg Contents in a Mixed Tree Cropping System inCentral AmazoniaMota, M. do s.', Lehmann, J.2, Schroth, G.3I Embrapa Amazonia Ocidental, Amazonas, Brazil2 University of Bayreuth, Federal Research Institute for Forestry, Germany3 University of Harnburg, GermanyThis study was carried out on a Xanthie Ferrasol north-eastof Manaus, Amazonas, Brazil. The main objeetive was tostudy the fertilizer effeets on P, K, Ca e Mg eontents inmixed tree eropping system with Brazil nut (Bertholletiaexcelsa), eupuaçu (Theobroma grandiflorum), peaeh palm(Bactris gasipaes), annatto (Bixa orellana) and pueraria(Pueraria phaseoloides). Fertilizer at four different levels(30%, 100%, 100%+P and 30%-N-lime) ofthe reeommend-ed fertilization, Embrapa Manaus) was applied in Deeember97. The soil samples were taken from 0-5, 5-10, 10-15,15-20 and 20-40 em depths in Oetober 97, January, Marehand May 98. The soil P, K, Ca and Mg were extraeted usingthe Mehlieh III method and were measured eolorimetrieally(AutoAnalyzer) for P and speetrophotometrieally (atomieabsorption speetrometer) for K, Ca and Mg.With a fertilization of lOO%+P, soil P eontents were highestat 0-5 and 10-15 em depths. Soils under annatto and peaehpalm had highest P eontents at ali depths, and showed arapid inerease from Oetober to May as a result of fertili-zation. Soi! K eontents inereased up to 15 em depths for alilevels of fertilization, in 15-20 and 20-40 em only with100% and l00%+P fertilization. Soils under peaeh palmand annatto had highest K eontents at 15-20 and 20-40 em.The soil Ca eontents were highest under peaeh palm andeupuaçu and lowest under pueraria. At 15-20 and 20-40 emdepths, K eontents were highest in Oetober and deereaseduntil May. The Mg eontents showed large variation withdepths and speeies and no eonsistent trend eould be identi-fied. At 15-20 and 20-40 em, Mg eontents were highest inOetober and January.The high soil nutrient eontents under peaeh palm indieatedthat this speeies does not need the large amounts of fertilizerapplied. For annatto the P and K fertilization eould be redu-eed. Generally, the speeies effeet was more clearly visiblebelow 15 em depth, whereas the effeet of fertilization domi-nated the nutrient differenees at the topsoil.Moia, M. do S., Lehmann, J., Schroth, G.: Fenilization Effects on SoU P, K, Ca and Mg Contents in a Mixed Tree Cropping System in Central Amazonia257

Fertilization effects on soil P, K, Ca and Mg contents in a mixed tree cropping system in Central Amazonia.

http://www.alice.cnptia.embrapa.br/bitstream/doc/673208/1/Neotropicalpag.257.pdf

Fertilization effects on soil P, K, Ca and Mg contents in a mixed tree cropping system in Central Amazonia.

Abstract

Similar works

Full text

Available Versions

Repository Open Access to Scientific Information from Embrapa