{"id":4284,"date":"2018-06-14T15:30:05","date_gmt":"2018-06-14T18:30:05","guid":{"rendered":"http:\/\/blog.rehagro.xyz\/?p=4284"},"modified":"2026-04-07T20:45:05","modified_gmt":"2026-04-07T23:45:05","slug":"deficiencia-de-magnesio","status":"publish","type":"post","link":"https:\/\/rehagro.com.br\/blog\/deficiencia-de-magnesio\/","title":{"rendered":"Defici\u00eancia de magn\u00e9sio no cafeeiro: principais sintomas e como fornecer"},"content":{"rendered":"<p>As plantas de caf\u00e9 absorvem o magn\u00e9sio (Mg) da solu\u00e7\u00e3o do solo na forma de Mg\u2082+. Ele \u00e9 acessado pelas ra\u00edzes principalmente pelos mecanismos de intercepta\u00e7\u00e3o radicular e fluxo de massa, contudo <strong>a absor\u00e7\u00e3o de Mg pode ser fortemente afetada pela alta disponibilidade de K+ e Ca\u2082+<\/strong>, devido \u00e0 inibi\u00e7\u00e3o competitiva.<\/p>\n<p>De maneira geral, as plantas de caf\u00e9 absorvem quatro vezes mais c\u00e1lcio em rela\u00e7\u00e3o ao magn\u00e9sio.<\/p>\n<p>Esse nutriente apresenta papel importante como <strong>componente estrutural da clorofila<\/strong> e ativa\u00e7\u00e3o enzim\u00e1tica, participando, assim, de v\u00e1rios processos vitais no metabolismo das plantas, como fotoss\u00edntese, respira\u00e7\u00e3o, s\u00edntese de carboidratos e outros.<\/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\/embed\/v2.js\"><\/script><br \/>\n<script>\nhbspt.forms.create({\nregion: \"na1\",\nportalId: \"5430441\",\nformId: \"7dcaf60d-0e23-40ed-8b40-9b8cb07b4128\"\n});\n<\/script><\/p>\n<\/div>\n<h2>Teor de magn\u00e9sio no solo<\/h2>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4286 size-full\" src=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto2.jpg\" alt=\"Refer\u00eancias para avalia\u00e7\u00e3o da an\u00e1lise de solo em cafeeiro\" width=\"550\" height=\"405\" srcset=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto2.jpg 550w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto2-300x221.jpg 300w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto2-370x272.jpg 370w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto2-270x199.jpg 270w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto2-80x60.jpg 80w\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" \/><span style=\"font-weight: 400; font-size: 10pt;\">Padr\u00f5es referenciais m\u00e9dios para avalia\u00e7\u00e3o de resultados de an\u00e1lise de solo na cultura do caf\u00e9<\/span><\/p>\n<ul>\n<li>A presente tabela refere-se a um solo de Textura e CTC m\u00e9dias (6-12).<\/li>\n<li>mg\/dm\u00b3 = ppm ;\u00a0 Cmol\/dm\u00b3 = eq.mg\/100g.<\/li>\n<li>Para o Alum\u00ednio e para o H + Al, a condi\u00e7\u00e3o de menores n\u00edveis \u00e9 a mais adequada, por isso os valores s\u00e3o decrescentes. (Fonte: PROCAF\u00c9).<\/li>\n<\/ul>\n<p>Atualmente alguns consultores e produtores trabalham para deixar o teor de Magn\u00e9sio no solo <strong>acima de 1,5 Cmol\/dm\u00b3<\/strong>, visto as altas produtividades alcan\u00e7adas ocasionando em maior extra\u00e7\u00e3o no solo.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4287 size-full\" src=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto3.jpg\" alt=\"Refer\u00eancias para avalia\u00e7\u00e3o da an\u00e1lise de folha do cafeeiro\" width=\"545\" height=\"343\" srcset=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto3.jpg 545w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto3-300x189.jpg 300w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto3-370x233.jpg 370w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto3-270x170.jpg 270w\" sizes=\"auto, (max-width: 545px) 100vw, 545px\" \/><span style=\"font-weight: 400; font-size: 10pt;\">Padr\u00f5es referenciais m\u00e9dios para avalia\u00e7\u00e3o de resultados de an\u00e1lise de folha na cultura do caf\u00e9<\/span><\/p>\n<p>Atualmente um dos fatores que mais ocasionam defici\u00eancia deste nutriente nas plantas \u00e9 o <strong>alto teor de pot\u00e1ssio no solo. <\/strong><\/p>\n<p>Em muitos casos a utiliza\u00e7\u00e3o de <strong><a href=\"https:\/\/rehagro.com.br\/blog\/potassio-na-cultura-do-cafe\/\" target=\"_blank\" rel=\"noopener\">aduba\u00e7\u00e3o com pot\u00e1ssio<\/a><\/strong> nas lavouras tem sido exagerada, somando-se com a falta de fornecimento de magn\u00e9sio. No solo <strong>uma boa rela\u00e7\u00e3o Ca:Mg:K seria 9:3:1 ou 25:5:1<\/strong> o que na maioria dos casos n\u00e3o ocorre.<\/p>\n<p><a href=\"https:\/\/conteudo.rehagro.com.br\/guia-identificacao-de-deficiencia-nutricional-no-cafeeiro?utm_campaign=material-cafe&amp;utm_source=guia-deficiencia-nutricional&amp;utm_medium=blog\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-39677 size-full\" title=\"Clique e baixe o material gratuitamente!\" src=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-deficiencias-nutricionais-cafeeiro.png\" alt=\"Guia Defici\u00eancias nutricionais no cafeeiro\" width=\"980\" height=\"317\" srcset=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-deficiencias-nutricionais-cafeeiro.png 980w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-deficiencias-nutricionais-cafeeiro-300x97.png 300w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-deficiencias-nutricionais-cafeeiro-768x248.png 768w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-deficiencias-nutricionais-cafeeiro-370x120.png 370w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-deficiencias-nutricionais-cafeeiro-270x87.png 270w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-deficiencias-nutricionais-cafeeiro-740x239.png 740w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2025\/09\/banner-guia-deficiencias-nutricionais-cafeeiro-150x49.png 150w\" sizes=\"auto, (max-width: 980px) 100vw, 980px\" \/><\/a><\/p>\n<h2>Quais os sintomas de defici\u00eancia de magn\u00e9sio?<\/h2>\n<p>Por ser um nutriente m\u00f3vel, a defici\u00eancia de magn\u00e9sio<strong> ocorre inicialmente nas folhas velhas<\/strong>, com clorose entre as nervuras, devido \u00e0 redu\u00e7\u00e3o no teor de clorofila.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4290 size-full\" src=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto6.jpg\" alt=\"Sintomas de defici\u00eancia de magn\u00e9sio no caf\u00e9\" width=\"322\" height=\"512\" srcset=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto6.jpg 322w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto6-189x300.jpg 189w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto6-270x429.jpg 270w\" sizes=\"auto, (max-width: 322px) 100vw, 322px\" \/><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4285 size-full\" src=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto.jpg\" alt=\"Sintomas de deficiencia de magn\u00e9sio no caf\u00e9\" width=\"434\" height=\"528\" srcset=\"https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto.jpg 434w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto-247x300.jpg 247w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto-370x450.jpg 370w, https:\/\/rehagro.com.br\/blog\/wp-content\/uploads\/2018\/06\/deficiencia-de-magnesio-correto-270x328.jpg 270w\" sizes=\"auto, (max-width: 434px) 100vw, 434px\" \/><\/p>\n<p style=\"text-align: center;\"><span style=\"font-size: 10pt;\">Folhas de cafeeiro com sintomas de defici\u00eancia de magn\u00e9sio<\/span><\/p>\n<h2>Como \u00e9 feito o fornecimento de magn\u00e9sio?<\/h2>\n<p>O fornecimento do magn\u00e9sio \u00e9 feito normalmente por <strong><a href=\"https:\/\/rehagro.com.br\/blog\/saiba-quando-usar-calcario\/\" target=\"_blank\" rel=\"noopener\">calc\u00e1rio<\/a><\/strong> com maiores teores de magn\u00e9sio. Salientando a import\u00e2ncia de suprir a demanda de Mg via calc\u00e1rio, visto que, as outras fontes de Mg s\u00e3o mais dispendiosas quando comparado ao fornecimento pelo calc\u00e1rio.<\/p>\n<p>Em lavouras que apresentarem defici\u00eancia desse nutriente, faz-se o fornecimento por \u00f3xido de magn\u00e9sio (45-54% de Mg) ou por sulfato de magn\u00e9sio (9% de Mg). Entretanto, esses casos s\u00e3o menos comuns, devido aos custos.<\/p>\n<p>Al\u00e9m disso, alguns t\u00e9cnicos realizam aplica\u00e7\u00f5es via foliar com Mg no in\u00edcio e no fim do per\u00edodo seco, devido \u00e0 dificuldade de absor\u00e7\u00e3o nesse per\u00edodo.<\/p>\n<h2>Corrija defici\u00eancias nutricionais e fortale\u00e7a a produtividade da lavoura<\/h2>\n<p>A defici\u00eancia de magn\u00e9sio no cafeeiro compromete o desenvolvimento das plantas, reduz a efici\u00eancia fotossint\u00e9tica e pode impactar diretamente a produ\u00e7\u00e3o. Para evitar perdas, \u00e9 fundamental identificar os sintomas precocemente e adotar estrat\u00e9gias de manejo nutricional integradas a uma boa gest\u00e3o da lavoura.<\/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 interpretar melhor as necessidades nutricionais, planejar a aduba\u00e7\u00e3o de forma estrat\u00e9gica, reduzir custos e conduzir sua produ\u00e7\u00e3o com foco em qualidade, efici\u00eancia e lucratividade.<\/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>Texto produzido pela Equipe Caf\u00e9 Rehagro.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>As plantas de caf\u00e9 absorvem o magn\u00e9sio (Mg) da solu\u00e7\u00e3o do solo na forma de Mg\u2082+. Ele \u00e9 acessado pelas ra\u00edzes principalmente pelos mecanismos de intercepta\u00e7\u00e3o radicular e fluxo de massa, contudo a absor\u00e7\u00e3o de Mg pode ser fortemente afetada pela alta disponibilidade de K+ e Ca\u2082+, devido \u00e0 inibi\u00e7\u00e3o competitiva. De maneira geral, as [&hellip;]<\/p>\n","protected":false},"author":21,"featured_media":4291,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[211],"tags":[282,266,286,353,350,352,251,252],"class_list":["post-4284","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cafe","tag-cafe","tag-cafeeiro","tag-lavouras","tag-macronutrientes","tag-magnesio","tag-nutriente","tag-plantio","tag-solo"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Magn\u00e9sio no cafeeiro: principais sintomas de defici\u00eancia<\/title>\n<meta name=\"description\" content=\"Por ser um nutriente m\u00f3vel, a defici\u00eancia de magn\u00e9sio no caf\u00e9 ocorre inicialmente nas folhas velhas, com clorose entre as nervuras.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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