caa a22 4500 463209362 CHVBK 20180405153135.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s10705-007-9105-7 doi (NATIONALLICENCE)springer-10.1007/s10705-007-9105-7 Nutrient concentration in soil water extracts and soybean nutrition in response to lime and gypsum applications to an acid Oxisol under no-till system [Elektronische Daten] [Fernando Zambrosi, Luís Alleoni, Eduardo Caires] No-till system (NTS) occupies 20 million hectares with grain crops in Brazil. However, calcium deficiency and aluminum toxicity can limit crop yields in many soils, and liming, associated to gypsum application, is an option for improving soil management. The objective of this study was to evaluate the effects of lime and gypsum application on the composition of soil water extracts of a clayey Rhodic Hapludox, cultivated with soybean under NTS. The experiment had a randomized complete block design with split-plots. The plots consisted of lime treatments (either a single rate of 4.5tha−1 or three annual rates of 1.5tha−1) surface-applied or incorporated at 0.2m depth. The subplots received surface applications of gypsum (3, 6 and 9tha−1). Liming increased total calcium and magnesium concentrations and the magnesium free Form activity (aMg2+) in the water extracts. The effect of liming on Mg was observed at deeper layers of the soil profile. Gypsum increased total concentration and free forms activities at calcium (aCa2+) and sulfate, but decreased to magnesium in the 0.05-0.2m soil layer. Part of Mg lost from these upper layers probably contributed to increased Mg in the subsoil (0.4-0.8m). Free forms activities at the aluminum, calcium, magnesium and sulfate were lower than the total concentrations, mainly for aluminum. Ca and Mg concentrations in soybean leaf tissue were positively correlated to the aCa2+ and aMg2+ in the soil water extract. Soybean grain yield was negatively correlated to both Mn total concentration and activity (free form) in the soil water extract, but it was positively correlated to sulfate (total concentration and free form activity) in the subsoil layer and to the Ca total concentration in the upper layer (0-0.05m). It is concluded that lime and gypsum ameliorate soybean grain yield under NTS. Springer Science+Business Media B.V., 2007 Ionic activity nationallicence Ionic availability nationallicence Leaching nationallicence Zambrosi Fernando Centro de Solos e Recursos Ambientais, Instituto Agronômico, C.P. 28, 13001-970, Campinas, SP, Brazil aut Alleoni Luís Escola Superior de Agricultura Luiz de Queiroz, Departamento de Ciência do Solo, USP, Universidade de São Paulo, C.P. 9, 13418-900, Piracicaba, SP, Brazil aut Caires Eduardo Departamento de Ciência do Solo e Engenharia Agrícola, UEPG, Universidade Estadual de Ponta Grossa, 84030-900, Ponta Grossa, PR, Brazil aut Nutrient Cycling in Agroecosystems Springer Netherlands 79/2(2007-10-01), 169-179 1385-1314 79:2<169 2007 79 10705 https://doi.org/10.1007/s10705-007-9105-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10705-007-9105-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zambrosi Fernando Centro de Solos e Recursos Ambientais, Instituto Agronômico, C.P. 28, 13001-970, Campinas, SP, Brazil aut NATIONALLICENCE 700 1- Alleoni Luís Escola Superior de Agricultura Luiz de Queiroz, Departamento de Ciência do Solo, USP, Universidade de São Paulo, C.P. 9, 13418-900, Piracicaba, SP, Brazil aut NATIONALLICENCE 700 1- Caires Eduardo Departamento de Ciência do Solo e Engenharia Agrícola, UEPG, Universidade Estadual de Ponta Grossa, 84030-900, Ponta Grossa, PR, Brazil aut NATIONALLICENCE 773 0- Nutrient Cycling in Agroecosystems Springer Netherlands 79/2(2007-10-01), 169-179 1385-1314 79:2<169 2007 79 10705 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer