Total soil electrical conductivity and critical soil K+ to Ca2+ and Mg2+ ratio for potato crops
Autor(a) principal: | |
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Data de Publicação: | 1999 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Scientia Agrícola (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400030 |
Resumo: | Soil K+ to Ca2+ and Mg2+ ratio as well as the total salinity were evaluated in response to potassium fertilizer application onto potato. Potassium was applied at six different rates (0, 60, 120, 240, 480 and 960 kg ha-1 of K2O), as K2SO4, and was placed during planting time in the furrow. Soil from the 0-200 mm layer was collected in the furrow, 20 and 48 days after plant emergence (DAE) to evaluate soil pH, K+, Ca2+ and Mg2+ contents and the total electrical conductivity (EC). A factorial design (6x2), with six K rates and two sampling times was set up in a randomized block design with four replications. The application of K fertilizer increased exchangeable K, did not affect pH and exchangeable Ca and Mg contents, but caused a linear increase of the soil K+/(Ca2++Mg2+)1/2 ratio as well as EC. At 20 DAE, the critical soil K+/(Ca2++Mg2+)1/2ratio and the EC associated with maximum tuber yield (30.5 Mg.ha-1, with 353.4 kg ha-1 of K2O) were 1.79 and 1.6 dS m-1, respectively. The highest soil K+/(Ca2++Mg2+)1/2 ratio and EC were obtained with the highest application of K fertilizer, which led to a reduction in the potato tuber yield. |
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Total soil electrical conductivity and critical soil K+ to Ca2+ and Mg2+ ratio for potato cropsSolanum tuberosumpotassiumcalciummagnesiumsalinitySoil K+ to Ca2+ and Mg2+ ratio as well as the total salinity were evaluated in response to potassium fertilizer application onto potato. Potassium was applied at six different rates (0, 60, 120, 240, 480 and 960 kg ha-1 of K2O), as K2SO4, and was placed during planting time in the furrow. Soil from the 0-200 mm layer was collected in the furrow, 20 and 48 days after plant emergence (DAE) to evaluate soil pH, K+, Ca2+ and Mg2+ contents and the total electrical conductivity (EC). A factorial design (6x2), with six K rates and two sampling times was set up in a randomized block design with four replications. The application of K fertilizer increased exchangeable K, did not affect pH and exchangeable Ca and Mg contents, but caused a linear increase of the soil K+/(Ca2++Mg2+)1/2 ratio as well as EC. At 20 DAE, the critical soil K+/(Ca2++Mg2+)1/2ratio and the EC associated with maximum tuber yield (30.5 Mg.ha-1, with 353.4 kg ha-1 of K2O) were 1.79 and 1.6 dS m-1, respectively. The highest soil K+/(Ca2++Mg2+)1/2 ratio and EC were obtained with the highest application of K fertilizer, which led to a reduction in the potato tuber yield.Escola Superior de Agricultura "Luiz de Queiroz"1999-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400030Scientia Agricola v.56 n.4 1999reponame:Scientia Agrícola (Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/S0103-90161999000400030info:eu-repo/semantics/openAccessReis Jr.,Roberto AnjosFontes,Paulo Cezar RezendeNeves,Júlio Cesar LimaSantos,Nerilson Terraeng2000-01-11T00:00:00Zoai:scielo:S0103-90161999000400030Revistahttp://revistas.usp.br/sa/indexPUBhttps://old.scielo.br/oai/scielo-oai.phpscientia@usp.br||alleoni@usp.br1678-992X0103-9016opendoar:2000-01-11T00:00Scientia Agrícola (Online) - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Total soil electrical conductivity and critical soil K+ to Ca2+ and Mg2+ ratio for potato crops |
title |
Total soil electrical conductivity and critical soil K+ to Ca2+ and Mg2+ ratio for potato crops |
spellingShingle |
Total soil electrical conductivity and critical soil K+ to Ca2+ and Mg2+ ratio for potato crops Reis Jr.,Roberto Anjos Solanum tuberosum potassium calcium magnesium salinity |
title_short |
Total soil electrical conductivity and critical soil K+ to Ca2+ and Mg2+ ratio for potato crops |
title_full |
Total soil electrical conductivity and critical soil K+ to Ca2+ and Mg2+ ratio for potato crops |
title_fullStr |
Total soil electrical conductivity and critical soil K+ to Ca2+ and Mg2+ ratio for potato crops |
title_full_unstemmed |
Total soil electrical conductivity and critical soil K+ to Ca2+ and Mg2+ ratio for potato crops |
title_sort |
Total soil electrical conductivity and critical soil K+ to Ca2+ and Mg2+ ratio for potato crops |
author |
Reis Jr.,Roberto Anjos |
author_facet |
Reis Jr.,Roberto Anjos Fontes,Paulo Cezar Rezende Neves,Júlio Cesar Lima Santos,Nerilson Terra |
author_role |
author |
author2 |
Fontes,Paulo Cezar Rezende Neves,Júlio Cesar Lima Santos,Nerilson Terra |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Reis Jr.,Roberto Anjos Fontes,Paulo Cezar Rezende Neves,Júlio Cesar Lima Santos,Nerilson Terra |
dc.subject.por.fl_str_mv |
Solanum tuberosum potassium calcium magnesium salinity |
topic |
Solanum tuberosum potassium calcium magnesium salinity |
description |
Soil K+ to Ca2+ and Mg2+ ratio as well as the total salinity were evaluated in response to potassium fertilizer application onto potato. Potassium was applied at six different rates (0, 60, 120, 240, 480 and 960 kg ha-1 of K2O), as K2SO4, and was placed during planting time in the furrow. Soil from the 0-200 mm layer was collected in the furrow, 20 and 48 days after plant emergence (DAE) to evaluate soil pH, K+, Ca2+ and Mg2+ contents and the total electrical conductivity (EC). A factorial design (6x2), with six K rates and two sampling times was set up in a randomized block design with four replications. The application of K fertilizer increased exchangeable K, did not affect pH and exchangeable Ca and Mg contents, but caused a linear increase of the soil K+/(Ca2++Mg2+)1/2 ratio as well as EC. At 20 DAE, the critical soil K+/(Ca2++Mg2+)1/2ratio and the EC associated with maximum tuber yield (30.5 Mg.ha-1, with 353.4 kg ha-1 of K2O) were 1.79 and 1.6 dS m-1, respectively. The highest soil K+/(Ca2++Mg2+)1/2 ratio and EC were obtained with the highest application of K fertilizer, which led to a reduction in the potato tuber yield. |
publishDate |
1999 |
dc.date.none.fl_str_mv |
1999-10-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400030 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400030 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-90161999000400030 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Escola Superior de Agricultura "Luiz de Queiroz" |
publisher.none.fl_str_mv |
Escola Superior de Agricultura "Luiz de Queiroz" |
dc.source.none.fl_str_mv |
Scientia Agricola v.56 n.4 1999 reponame:Scientia Agrícola (Online) instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Scientia Agrícola (Online) |
collection |
Scientia Agrícola (Online) |
repository.name.fl_str_mv |
Scientia Agrícola (Online) - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
scientia@usp.br||alleoni@usp.br |
_version_ |
1748936456930328576 |