{"id":6322,"date":"2019-11-19T15:00:40","date_gmt":"2019-11-19T17:00:40","guid":{"rendered":"https:\/\/rehagro.com.br\/blog\/?p=6322"},"modified":"2026-04-08T15:38:48","modified_gmt":"2026-04-08T18:38:48","slug":"saiba-como-calcular-soma-de-bases","status":"publish","type":"post","link":"https:\/\/rehagro.com.br\/blog\/saiba-como-calcular-soma-de-bases\/","title":{"rendered":"Como calcular soma de bases, CTC\u2019s, satura\u00e7\u00e3o por bases e satura\u00e7\u00e3o por alum\u00ednio?"},"content":{"rendered":"<p>Voc\u00ea sabe o que \u00e9, e <strong>como calcular a soma de bases<\/strong>,<strong> capacidade de troca de c\u00e1tions (CTC) efetiva e potencial, satura\u00e7\u00e3o por bases e satura\u00e7\u00e3o por alum\u00ednio<\/strong> na an\u00e1lise de solo?<\/p>\n<p>Este material mostra as f\u00f3rmulas com exemplos pr\u00e1ticos para que voc\u00ea saiba realizar esses c\u00e1lculos.<\/p>\n<div style=\"background-color: #efefef; padding-left: 10px; padding-right: 5px; border-radius: 10px;\">\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><strong><span style=\"font-size: 14pt;\">Sem tempo para ler agora? Baixe este artigo em PDF!<\/span><\/strong><\/p>\n<p><script charset=\"utf-8\" type=\"text\/javascript\" src=\"\/\/js.hsforms.net\/forms\/v2.js\"><\/script><br \/>\n<script>\n  hbspt.forms.create({\n    region: \"na1\",\n    portalId: \"5430441\",\n    formId: \"7dcaf60d-0e23-40ed-8b40-9b8cb07b4128\",\n    version: \"V2_PRERELEASE\"\n  });\n<\/script><\/p>\n<\/div>\n<h2>Amostra de solo para an\u00e1lise e realiza\u00e7\u00e3o dos c\u00e1lculos<\/h2>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-22623 size-full\" src=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/calcular-soma-de-bases-1.jpg\" alt=\"Coletando amostra de solo em um trado\" width=\"382\" height=\"627\" srcset=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/calcular-soma-de-bases-1.jpg 382w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/calcular-soma-de-bases-1-183x300.jpg 183w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/calcular-soma-de-bases-1-370x607.jpg 370w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/calcular-soma-de-bases-1-270x443.jpg 270w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/calcular-soma-de-bases-1-150x246.jpg 150w\" sizes=\"auto, (max-width: 382px) 100vw, 382px\" \/><span style=\"font-size: 10pt;\">Trado holand\u00eas com amostra de solo em lavoura de caf\u00e9 (Foto: Larissa Cocato)<\/span><\/p>\n<p>Com base em uma <strong><a href=\"https:\/\/rehagro.com.br\/blog\/interpretacao-de-uma-analise-de-solo\/\" target=\"_blank\" rel=\"noopener\">an\u00e1lise de solo<\/a><\/strong> retirada na proje\u00e7\u00e3o da saia do cafeeiro, na profundidade de 0-20 cm temos o seguinte resultado:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-41833\" src=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/analise-solo-projecao-saia.png\" alt=\"An\u00e1lise do solo\" width=\"960\" height=\"136\" srcset=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/analise-solo-projecao-saia.png 960w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/analise-solo-projecao-saia-300x43.png 300w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/analise-solo-projecao-saia-768x109.png 768w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/analise-solo-projecao-saia-370x52.png 370w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/analise-solo-projecao-saia-270x38.png 270w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/analise-solo-projecao-saia-740x105.png 740w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/analise-solo-projecao-saia-150x21.png 150w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><\/p>\n<p style=\"text-align: center;\"><span style=\"font-size: 10pt;\">Resultado da an\u00e1lise de solo de 0 \u2013 20 cm de profundidade em lavoura de caf\u00e9.<\/span><\/p>\n<p><a href=\"https:\/\/conteudo.rehagro.com.br\/guia-amostragem-de-solo-em-lavoura-de-cafe?utm_campaign=material-cafe&amp;utm_source=guia-amostragem-solo&amp;utm_medium=blog\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-39676 size-full\" title=\"Clique e baixe o material gratuitamente!\" src=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-amostragem-solo-cafeeiro.png\" alt=\"Guia Amostragem de solo na lavoura de caf\u00e9\" width=\"980\" height=\"317\" srcset=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-amostragem-solo-cafeeiro.png 980w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-amostragem-solo-cafeeiro-300x97.png 300w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-amostragem-solo-cafeeiro-768x248.png 768w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-amostragem-solo-cafeeiro-370x120.png 370w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-amostragem-solo-cafeeiro-270x87.png 270w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-amostragem-solo-cafeeiro-740x239.png 740w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-amostragem-solo-cafeeiro-150x49.png 150w\" sizes=\"auto, (max-width: 980px) 100vw, 980px\" \/><\/a><\/p>\n<h2>C\u00e1lculo de soma de bases (SB)<\/h2>\n<p>\u00c9 a soma de c\u00e1tions permut\u00e1veis, exceto H<sup>+<\/sup> e Al<sup>3+<\/sup>.<\/p>\n<ul>\n<li><strong>SB = Ca<sup>2+<\/sup> + Mg<sup>2+<\/sup> + K<sup>+<\/sup><\/strong><\/li>\n<\/ul>\n<p>Com base nos valores da an\u00e1lise de solo, temos o seguinte exemplo:<\/p>\n<p>Ex: SB = 3,21 cmolc\/dm\u00b3 + 1,61 cmolc \/ dm\u00b3 + (126,6 mg\/dm\u00b3\/391) = 5,14 cmolc\/dm\u00b3<\/p>\n<p>*OBS: na an\u00e1lise de solo o pot\u00e1ssio \u00e9 dado em mg\/dm<sup>3<\/sup>, para passar para cmolc\/ dm<sup>3<\/sup> \u00e9 necess\u00e1rio dividir por 391.<\/p>\n<h2>C\u00e1lculo da CTC efetiva (t)<\/h2>\n<p>\u00c9 a capacidade de troca de c\u00e1tions do solo no seu pH natural.<\/p>\n<ul>\n<li><strong>t = Al + Ca<sup>2+<\/sup> + Mg<sup>2+<\/sup> + K<sup>+ <\/sup><\/strong>ou<\/li>\n<li><strong>t = SB + Al<\/strong><\/li>\n<\/ul>\n<p>Com base nos valores da an\u00e1lise de solo, temos o seguinte exemplo:<\/p>\n<p>Ex: t = 0,25 cmolc\/dm\u00b3 + 3,21 cmolc\/dm\u00b3 + 1,61 cmolc \/dm\u00b3 + (126,6 mg\/dm\u00b3\/391) = 5,39 cmolc\/dm\u00b3<\/p>\n<h2>C\u00e1lculo da CTC potencial (T)<\/h2>\n<p>\u00c9 a capacidade de troca de c\u00e1tions a pH 7,0.<\/p>\n<ul>\n<li><strong>T = SB + H + Al<\/strong><\/li>\n<\/ul>\n<p>Com base nos valores da an\u00e1lise de solo, temos o seguinte exemplo:<\/p>\n<p>Ex: T = 5,14 cmolc\/dm\u00b3 + 4,05 cmolc\/dm\u00b3 = 9,19 cmolc\/dm\u00b3<\/p>\n<p><a href=\"https:\/\/rehagro.com.br\/cursos\/capacitacao-em-gestao-na-producao-de-cafe?utm_campaign=mkt-materiais-gc&amp;utm_source=textos&amp;utm_medium=blog\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-28254 size-full\" title=\"Clique e saiba mais sobre o curso!\" src=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2020\/07\/botao-gc-arabica-1.jpg\" alt=\"Curso Gest\u00e3o na Produ\u00e7\u00e3o de Caf\u00e9 Ar\u00e1bica\" width=\"900\" height=\"250\" srcset=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2020\/07\/botao-gc-arabica-1.jpg 900w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2020\/07\/botao-gc-arabica-1-300x83.jpg 300w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2020\/07\/botao-gc-arabica-1-768x213.jpg 768w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2020\/07\/botao-gc-arabica-1-370x103.jpg 370w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2020\/07\/botao-gc-arabica-1-270x75.jpg 270w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2020\/07\/botao-gc-arabica-1-740x206.jpg 740w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2020\/07\/botao-gc-arabica-1-150x42.jpg 150w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/a><\/p>\n<h2>C\u00e1lculo da satura\u00e7\u00e3o por bases (V)<\/h2>\n<p>\u00c9 a soma das bases troc\u00e1veis expressa em porcentagem de capacidade de troca de c\u00e1tions.<\/p>\n<ul>\n<li><strong>V% = (SB x 100) \/ T<\/strong><\/li>\n<\/ul>\n<p>Com base nos valores da an\u00e1lise de solo, temos o seguinte exemplo:<\/p>\n<p>Ex: V% = (5,14 cmolc\/dm\u00b3 x 100) \/ 9,19 cmolc\/dm\u00b3 = 55,9%<\/p>\n<h2>C\u00e1lculo da satura\u00e7\u00e3o por alum\u00ednio (m)<\/h2>\n<p>Representa quantos % da CTC efetiva est\u00e3o ocupados pelo Al.<\/p>\n<ul>\n<li><strong>m% = (Al x 100) \/ t<\/strong><\/li>\n<\/ul>\n<p>Com base nos valores da an\u00e1lise de solo, temos o seguinte exemplo:<\/p>\n<p>Ex: m% = (0,25 cmolc\/ dm<sup>3<\/sup> x 100) \/ 5,39 cmolc\/ dm<sup>3<\/sup> = 4,6 %<\/p>\n<h2>Porcentagem de satura\u00e7\u00e3o dos c\u00e1tions da CTC a pH 7,0<\/h2>\n<p><strong>C\u00e1tions da CTC potencial = (Teor do c\u00e1tion \/ T) * 100<\/strong><\/p>\n<p>Com base nos valores da an\u00e1lise de solo, temos os seguintes exemplos:<\/p>\n<ul>\n<li>Satura\u00e7\u00e3o de c\u00e1lcio: % Ca = (Ca<sup>2+<\/sup>\/ T)* 100<\/li>\n<\/ul>\n<p>Ex: (3,21 cmolc\/dm<sup>3<\/sup>\/ 9,19 cmolc\/dm<sup>3<\/sup>) * 100 = 34,9 %<\/p>\n<ul>\n<li>Satura\u00e7\u00e3o de magn\u00e9sio: % Mg = (Mg<sup>2+<\/sup>\/T)* 100<\/li>\n<\/ul>\n<p>Ex: (1,61 cmolc\/dm<sup>3<\/sup> \/ 9,19 cmolc\/dm<sup>3<\/sup>) * 100 = 17,5 %<\/p>\n<ul>\n<li>Satura\u00e7\u00e3o de pot\u00e1ssio: % K = (K<sup>+<\/sup>\/T)* 100<\/li>\n<\/ul>\n<p>Ex: [(126,6 mg\/dm<sup>3 <\/sup>\/ 391) \/ 9,19 cmolc\/ dm<sup>3<\/sup>) * 100 = 3,5 %<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-22624 size-full\" src=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/calcular-soma-de-bases-2.jpg\" alt=\"Esquema mostrando as informa\u00e7\u00f5es necess\u00e1rias para calcular a CTC potencial (a pH 7,0) (T), CTC efetiva (t) e soma de bases (SB)\" width=\"475\" height=\"353\" srcset=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/calcular-soma-de-bases-2.jpg 475w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/calcular-soma-de-bases-2-300x223.jpg 300w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/calcular-soma-de-bases-2-370x275.jpg 370w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/calcular-soma-de-bases-2-270x201.jpg 270w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/calcular-soma-de-bases-2-80x60.jpg 80w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/calcular-soma-de-bases-2-150x111.jpg 150w\" sizes=\"auto, (max-width: 475px) 100vw, 475px\" \/><span style=\"font-size: 10pt;\">Esquema mostrando as informa\u00e7\u00f5es necess\u00e1rias para calcular a CTC potencial (a pH 7,0) (T), CTC efetiva (t) e soma de bases (SB). (Fonte: Rehagro)<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-41834\" src=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/tabela-soma-bases.png\" alt=\"Soma de bases\" width=\"765\" height=\"138\" srcset=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/tabela-soma-bases.png 765w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/tabela-soma-bases-300x54.png 300w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/tabela-soma-bases-370x67.png 370w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/tabela-soma-bases-270x49.png 270w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/tabela-soma-bases-740x133.png 740w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2019\/11\/tabela-soma-bases-150x27.png 150w\" sizes=\"auto, (max-width: 765px) 100vw, 765px\" \/><\/p>\n<p style=\"text-align: center;\"><span style=\"font-size: 10pt;\">Soma de bases, CTC efetiva e potencial, satura\u00e7\u00e3o por bases e satura\u00e7\u00e3o por alum\u00ednio, de an\u00e1lise de solo em lavoura de caf\u00e9.<\/span><\/p>\n<h2>Transforme a an\u00e1lise de solo em decis\u00f5es mais assertivas na lavoura de caf\u00e9<\/h2>\n<p>Saber calcular a soma de bases, a CTC, a satura\u00e7\u00e3o por bases e por alum\u00ednio \u00e9 fundamental para interpretar corretamente a fertilidade do solo e direcionar o manejo nutricional do cafeeiro. Mas, para que esses n\u00fameros se convertam em produtividade e lucro, \u00e9 preciso unir conhecimento t\u00e9cnico e gest\u00e3o eficiente.<\/p>\n<p>No <strong><a href=\"https:\/\/rehagro.com.br\/cursos\/capacitacao-em-gestao-na-producao-de-cafe?utm_campaign=mkt-materiais-gc&amp;utm_source=textos&amp;utm_medium=blog\">Curso Gest\u00e3o na Produ\u00e7\u00e3o de Caf\u00e9 Ar\u00e1bica<\/a> <\/strong>do Rehagro, voc\u00ea aprende a transformar dados da an\u00e1lise de solo em a\u00e7\u00f5es pr\u00e1ticas, planejar a nutri\u00e7\u00e3o de forma estrat\u00e9gica, reduzir custos e conduzir sua lavoura com foco em efici\u00eancia e rentabilidade.<\/p>\n<p><a href=\"https:\/\/rehagro.com.br\/cursos\/capacitacao-em-gestao-na-producao-de-cafe?utm_campaign=mkt-materiais-gc&amp;utm_source=textos&amp;utm_medium=blog\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-24250 size-full\" title=\"Clique e saiba mais sobre o curso!\" src=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2023\/09\/banner-gc.jpg\" alt=\"Curso Gest\u00e3o na Produ\u00e7\u00e3o de Caf\u00e9 Ar\u00e1bica\" width=\"980\" height=\"317\" srcset=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2023\/09\/banner-gc.jpg 980w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2023\/09\/banner-gc-300x97.jpg 300w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2023\/09\/banner-gc-768x248.jpg 768w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2023\/09\/banner-gc-370x120.jpg 370w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2023\/09\/banner-gc-270x87.jpg 270w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2023\/09\/banner-gc-740x239.jpg 740w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2023\/09\/banner-gc-150x49.jpg 150w\" sizes=\"auto, (max-width: 980px) 100vw, 980px\" \/><\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-18459 size-full\" src=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2022\/12\/larissa-cocato.jpg\" alt=\"Larissa Cocato - Coordenadora de Ensino Caf\u00e9\" width=\"300\" height=\"96\" srcset=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2022\/12\/larissa-cocato.jpg 300w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2022\/12\/larissa-cocato-270x86.jpg 270w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2022\/12\/larissa-cocato-150x48.jpg 150w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Voc\u00ea sabe o que \u00e9, e como calcular a soma de bases, capacidade de troca de c\u00e1tions (CTC) efetiva e potencial, satura\u00e7\u00e3o por bases e satura\u00e7\u00e3o por alum\u00ednio na an\u00e1lise de solo? Este material mostra as f\u00f3rmulas com exemplos pr\u00e1ticos para que voc\u00ea saiba realizar esses c\u00e1lculos. &nbsp; Sem tempo para ler agora? Baixe este [&hellip;]<\/p>\n","protected":false},"author":21,"featured_media":28931,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[211],"tags":[530,282,805,463,252],"class_list":["post-6322","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cafe","tag-analise-do-solo","tag-cafe","tag-ctc","tag-lavoura","tag-solo"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Como calcular soma de bases, CTC, satura\u00e7\u00e3o por bases na an\u00e1lise de solo?<\/title>\n<meta name=\"description\" content=\"Aprenda como calcular a soma de bases, capacidade de troca de c\u00e1tions (CTC), satura\u00e7\u00e3o por bases e satura\u00e7\u00e3o por alum\u00ednio na an\u00e1lise de solo.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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