{"id":1058,"date":"2024-05-17T14:46:46","date_gmt":"2024-05-17T14:46:46","guid":{"rendered":"https:\/\/progreseed.com.br\/?p=1058"},"modified":"2025-11-11T14:56:37","modified_gmt":"2025-11-11T14:56:37","slug":"formacao-de-pastagens-emergencia-e-estabelecimento-das-plantas","status":"publish","type":"post","link":"https:\/\/progreseed.com.br\/es\/formacao-de-pastagens-emergencia-e-estabelecimento-das-plantas\/","title":{"rendered":"Cultivo de Pastos Tropicales: Etapa del Establecimiento de Plantas"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1058\" class=\"elementor elementor-1058\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-d3163ef elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"d3163ef\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-63b004b0\" data-id=\"63b004b0\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-53b54588 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"53b54588\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>O resultado da germina\u00e7\u00e3o de uma semente de gram\u00ednea \u00e9 uma <b>pl\u00e2ntula<\/b> (i.e., \u201cplantinha\u201d) composta pelo cole\u00f3ptilo contendo a pl\u00famula (prim\u00f3rdios foliares) e pela raiz prim\u00e1ria (Fig. 1); em algumas esp\u00e9cies dessa fam\u00edlia de plantas algumas outras ra\u00edzes seminais s\u00e3o tamb\u00e9m produzidas.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/progreseed.com.br\/wp-content\/uploads\/2024\/05\/Imagem-plantula.jpg\" alt=\"\" width=\"350\" height=\"654\" \/><\/p>\n<p>\u00a0<\/p>\n<p>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Figura 1: Desenho esquem\u00e1tico de uma pl\u00e2ntula de gram\u00ednea\u00a0<br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0tropical usada como pastagem cultivada.<\/p>\n<p>O crescimento vertical do cole\u00f3ptilo a partir do <a href=\"https:\/\/progreseed.com.br\/sementes-de-gramineas-forrageiras-tropicais-mais-do-que-veem-os-olhos\/\" target=\"_blank\" rel=\"noopener\"><b>embri\u00e3o<\/b> <\/a>o faz emergir na superf\u00edcie do solo, ocasi\u00e3o em que seu \u00e1pice \u00e9 rompido pelos prim\u00f3rdios foliares. Esse processo \u00e9 sustentado pelas reservas das sementes, mas \u00e0 medida que os prim\u00f3rdios se tornam folhas, a pl\u00e2ntula deixa de depender das reservas e se torna autotr\u00f3fica, ou seja, capaz de produzir seu pr\u00f3prio alimento via fotoss\u00edntese. \u00c9 quando a pl\u00e2ntula se torna uma planta jovem.<\/p>\n<p>Al\u00e9m de\u00a0<a href=\"https:\/\/progreseed.com.br\/escolha-da-epoca-de-plantio-de-pastagens-tropicais-no-brasil-entre-o-planejamento-e-o-lamento\/\" target=\"_blank\" rel=\"noopener\"><b>condi\u00e7\u00f5es de<\/b> <b>clima e de solo e de procedimentos de plantio<\/b><\/a> (profundidade, m\u00e9todo), a emerg\u00eancia \u00e9 condicionada pelo grau de matura\u00e7\u00e3o, tamanho, vigor e sanidade da semente.\u00a0<a href=\"https:\/\/progreseed.com.br\/peso-de-sementes-de-gramineas-tropicais-usadas-como-pastagens-variacoes-causas-e-efeitos\/\" target=\"_blank\" rel=\"noopener\"><b>As sementes de gram\u00edneas forrageiras tropicais s\u00e3o pequenas<\/b><\/a> se comparadas ao tamanho de outras esp\u00e9cies agr\u00edcolas. Assim, em plantios profundos suas reservas podem ser exauridas antes que a emerg\u00eancia aconte\u00e7a, impossibilitando-a; esse problema \u00e9 mais frequente em solos argilosos (em especial quando compactados) que nos arenosos.<\/p>\n<p>Entretanto, as pl\u00e2ntulas de v\u00e1rias esp\u00e9cies de gram\u00edneas apresentam uma estrutura permite a elas compensarem \u2013 at\u00e9 certo ponto &#8211; varia\u00e7\u00f5es de profundidade de plantio. Trata-se do mesoc\u00f3tilo (Fig. 1), uma regi\u00e3o situada entre a base do cole\u00f3ptilo (n\u00f3 coleoptilar) e o embri\u00e3o da semente a qual, ao se alongar, \u2018empurra\u2019 o cole\u00f3ptilo em dire\u00e7\u00e3o \u00e0 superf\u00edcie do solo. O alongamento \u00e9 maior ou menor, a depender da profundidade na qual a semente est\u00e1 posicionada no solo.<\/p>\n<p>O tamanho das sementes est\u00e1 diretamente correlacionado \u00e0 fragilidade das pl\u00e2ntulas e, por esse motivo, a profundidade de plantio tem import\u00e2ncia especial. \u00c9 comum, por exemplo, a redu\u00e7\u00e3o da emerg\u00eancia de pl\u00e2ntulas quando sementes de cultivares de <i>Megathyrsus maximus <\/i>[sin. <i>Panicum maximum<\/i>] (650 \u2013 1.100 sementes\/g) s\u00e3o plantadas em profundidades superiores a 1,5cm; o mesmo ocorre com sementes de esp\u00e9cies do g\u00eanero <i>Urochloa <\/i>(<i>U. brizantha<\/i>, <i>U. decumbens<\/i>, <i>U. ruziziensis<\/i>, <i>U. humidicola<\/i>) [100 \u2013 250 unidades\/g], plantadas a profundidades superiores a 2,5cm.<\/p>\n<p>No entanto, por v\u00e1rias causas, mesmo sob condi\u00e7\u00f5es boas de plantio apenas uma fra\u00e7\u00e3o (menos de 25%) das sementes vi\u00e1veis plantadas resultam em pl\u00e2ntulas emergidas. Exemplos dessas causas s\u00e3o: fragilidade das pl\u00e2ntulas, irregularidades na profundidade de cobertura das sementes, baixo vigor das sementes, perdas de sementes por eros\u00f5es, destrui\u00e7\u00e3o por insetos, p\u00e1ssaros, microrganismos e roedores, extremos de temperatura e de umidade do solo, alelopatia, competi\u00e7\u00e3o com plantas invasoras, etc. Por esse motivo no c\u00e1lculo de taxas de semeadura, para cada esp\u00e9cie\/ cultivar \u00e9 necess\u00e1rio estimar uma taxa prov\u00e1vel de emerg\u00eancia (n\u00ba pl\u00e2ntulas\/n\u00ba sementes puras vi\u00e1veis plantadas) em fun\u00e7\u00e3o do grau de fragilidade das pl\u00e2ntulas e das condi\u00e7\u00f5es de plantio (\u00e9poca, m\u00e9todo de plantio, tipo de preparo do solo, umidade do solo, etc).<\/p>\n<p>O estabelecimento da pastagem \u00e9 alcan\u00e7ado quando, a partir do plantio de sementes, se obt\u00e9m a densidade desejada de plantas da esp\u00e9cie\/cultivar escolhida, suficientemente desenvolvidas para permitir o in\u00edcio do pastejo da \u00e1rea plantada. Em plantios \u00e0 lan\u00e7o com cobertura das sementes, a emerg\u00eancia de pelo menos 20 pl\u00e2ntulas\/m\u00b2 pode permitir o alcance dessa meta com esp\u00e9cies do g\u00eanero <i>Urochloa<\/i>, exceto <i>U. humidicola <\/i>que requer um n\u00famero maior (aprox. 30 &#8211; 40), e 40 pl\u00e2ntulas\/m\u00b2 no caso de cultivares de <i>M. maximus<\/i>. Como exemplo, a taxa de semeadura para um lote comercial de sementes nuas, i.e., n\u00e3o encrustadas ou peletizadas, de <i>M. maximus <\/i>cv. Zuri, apresentando 60% de\u00a0<a href=\"https:\/\/progreseed.com.br\/ate-que-ponto-o-valor-cultural-define-a-qualidade-de-lotes-de-sementes-de-plantas-forrageiras\/\" target=\"_blank\" rel=\"noopener\"><b>valor cultural<\/b><\/a>\u00a0(%VC), pode ser calculada do seguinte modo:\u00a0<br \/><span style=\"background-color: transparent;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0* 60% VC = 0,6g sementes puras vi\u00e1veis (spv)\/grama das sementes comerciais;\u00a0<br \/><\/span><span style=\"background-color: transparent;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0* 0,6g spv x 700 sementes\/g (que \u00e9 um valor m\u00e9dio para essa cv.) = 420 spv\/g\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 sementes comerciais;\u00a0<br \/><\/span><span style=\"background-color: transparent;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0* supondo 25% de emerg\u00eancia: 420 spv\/g\/m\u00b2 x 0,25 = 105 pl\u00e2ntulas\/m\u00b2 sementes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0comerciais;\u00a0<br \/><\/span><span style=\"background-color: transparent;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0* se o desejado for 40 pl\u00e2ntulas\/m\u00b2, ent\u00e3o ser\u00e1 necess\u00e1rio plantar 0,38g\/m\u00b2 das\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0sementes comerciais, equivalentes a 3,8 kg\/ha.<\/span><\/p>\n<p><span style=\"background-color: transparent;\">Esse resultado, entretanto, s\u00f3 seria adequado para situa\u00e7\u00f5es \u2018boas\u2019 de plantio, ou seja, solo \u00famido e bem-preparado, plantio \u00e0 lan\u00e7o na \u00e9poca correta, sementes cobertas com solo em profundidade n\u00e3o superior a 1,5cm, \u00e1rea submetida a\u00a0<\/span><a href=\"https:\/\/progreseed.com.br\/o-uso-de-rolo-compactador-no-plantio-de-pastagens-bom-desde-que-2\/\" target=\"_blank\" rel=\"noopener\"><b>rolagem destorroadora<\/b>\u00a0<\/a>no plantio<span style=\"background-color: transparent;\">. Para condi\u00e7\u00f5es n\u00e3o t\u00e3o ideais \u2013 o que geralmente \u00e9 a norma \u2013 o c\u00e1lculo deve ser feito com base em taxa de emerg\u00eancia inferior a 25%, escolhida arbitrariamente pelo interessado com base em experi\u00eancia local, nas condi\u00e7\u00f5es locais de clima e de preparo do solo e do m\u00e9todo de plantio a ser utilizado.<\/span><\/p>\n<p><span style=\"background-color: transparent;\">Esse c\u00e1lculo pode tamb\u00e9m ser feito objetivando um n\u00famero de pl\u00e2ntulas superior a 40\/m\u00b2. Esse n\u00famero, entretanto, n\u00e3o deve ser muito maior, caso contr\u00e1rio poder\u00e1 ocorrer morte de grande parte das plantas jovens em consequ\u00eancia do acirramento da competi\u00e7\u00e3o entre elas por \u00e1gua, luz e nutrientes.<\/span><\/p>\n<p><span style=\"background-color: transparent;\">Assim, se no c\u00e1lculo da taxa de semeadura for considerada uma taxa de emerg\u00eancia de 15%, buscando-se 60 pl\u00e2ntulas\/m\u00b2, essa taxa ser\u00e1 9,5 kg\/ha das sementes do lote comercial de capim-zuri com VC de 60%, aqui usado como exemplo. Germina\u00e7\u00e3o e estabelecimento s\u00e3o etapas fundamentais da forma\u00e7\u00e3o da pastagem, mas \u00eaxito da forma\u00e7\u00e3o depende ainda de um primeiro pastejo criterioso. Mas isso \u00e9 outra hist\u00f3ria\u2026<\/span><\/p>\n<p><!-- \/wp:list-item --><\/p>\n<p><!-- \/wp:list --><!-- wp:paragraph --><\/p>\n<p><b>H\u00e1 mais sobre esse assunto em:<\/b><br \/>COOK, S. Pasture establishment on old cropping country in southern Queensland. Tropical\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Grasslands, v.41, p.191-199, 2007.<br \/>HOPKINSON, J.M. Tropical pasture establishment. 2. Seed characteristics and field\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0establishment. Tropical Grasslands, v.27, p.276-290, 1993.<br \/>SILCOCK, R.G. Seedling characteristics of tropical pasture species and their implications for\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0ease of establishment. Tropical Grasslands, v.14, n.3, p.174-180, 1980.<br \/>SILCOCK, R.G.; JOHNSTON, P.W. Tropical pasture establishment. 9. Establishing new\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0pastures in difficult tropical environments \u2013 do we expect too much? Tropical <br \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Grasslands, v.27, p.349-358, 1993.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p><b>Agradecimento:<\/b><br \/>o Autor agradece ao Eng\u00ba Agr\u00ba Luciano Paiva Gomes (SEMPA Sementes Ltda.) pelos valiosos coment\u00e1rios que fez sobre esse texto.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p><b>Esse texto pode ser citado da seguinte forma:<\/b><br \/>SOUZA, F.H.D. 2024. Forma\u00e7\u00e3o de pastagens: emerg\u00eancia e estabelecimento. Dispon\u00edvel\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0em: https:\/\/progreseed.com.br\/formacao-de-pastagens-emergencia-e-estabelecimento<br \/>\u00a0 \u00a0 \u00a0 -das-plantas\/ Acessado em dia\/m\u00eas\/ano.<\/p>\n<p><!-- \/wp:paragraph --><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>O resultado da germina\u00e7\u00e3o de uma semente de gram\u00ednea \u00e9 uma pl\u00e2ntula (i.e., \u201cplantinha\u201d) composta pelo cole\u00f3ptilo contendo a pl\u00famula (prim\u00f3rdios foliares) e pela raiz prim\u00e1ria (Fig. 1); em algumas esp\u00e9cies dessa fam\u00edlia de plantas algumas outras ra\u00edzes seminais s\u00e3o tamb\u00e9m produzidas. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1068,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","footnotes":""},"categories":[7],"tags":[],"class_list":["post-1058","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comentario"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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