{"id":62267,"date":"2018-12-21T10:23:17","date_gmt":"2018-12-21T15:23:17","guid":{"rendered":"https:\/\/www.agribusinessglobal.com\/?p=62267"},"modified":"2018-12-21T10:23:17","modified_gmt":"2018-12-21T15:23:17","slug":"how-sensors-and-science-are-improving-farming-in-the-desert","status":"publish","type":"post","link":"https:\/\/www.agribusinessglobal.com\/pt\/markets\/how-sensors-and-science-are-improving-farming-in-the-desert\/","title":{"rendered":"Como sensores e ci\u00eancia est\u00e3o melhorando a agricultura no deserto"},"content":{"rendered":"<p>De acordo com globalagriculture.org, a agricultura est\u00e1 consumindo a \u00e1gua doce dispon\u00edvel na Terra a uma taxa surpreendente: 70% de \u201c\u00e1gua azul\u201d de cursos de \u00e1gua e \u00e1guas subterr\u00e2neas s\u00e3o usadas para agricultura, relata a organiza\u00e7\u00e3o \u2013 tr\u00eas vezes o n\u00edvel usado h\u00e1 50 anos. Espera-se que a demanda aumente em 19% nos pr\u00f3ximos 30 anos devido \u00e0s necessidades de irriga\u00e7\u00e3o dos agricultores.<\/p>\n<p>Os avan\u00e7os na tecnologia e na ci\u00eancia por tr\u00e1s do cultivo de safras (seja milho, soja, frutas ou vegetais) podem permitir rendimentos consistentemente bons, apesar das condi\u00e7\u00f5es clim\u00e1ticas que, de outra forma, poderiam parecer assustadoras para agricultores e produtores.<\/p>\n<p>Em uma \u00e1rea da Espanha com talvez as condi\u00e7\u00f5es agr\u00edcolas mais in\u00f3spitas de toda a Europa, pesquisas foram conduzidas sobre o uso de sensores e surfactantes de solo. Os testes n\u00e3o s\u00f3 levaram a uma melhor compreens\u00e3o do gerenciamento de irriga\u00e7\u00e3o, mas tamb\u00e9m a como corrigir o solo para realmente reduzir a demanda por irriga\u00e7\u00e3o na regi\u00e3o.<\/p>\n<p>As li\u00e7\u00f5es aprendidas na Espanha s\u00e3o aplic\u00e1veis globalmente, para garantir que a demanda cada vez maior por \u00e1gua seja acompanhada por rendimentos correspondentemente maiores para alimentar o mundo.<\/p>\n<h2>A ascens\u00e3o da agricultura de precis\u00e3o<\/h2>\n<p>Sensores e tecnologia de mapeamento permitem que fazendeiros maximizem os rendimentos com recursos m\u00ednimos. Chamada de agricultura de precis\u00e3o, a tecnologia tamb\u00e9m come\u00e7ou a ser chamada de agricultura \u201cinteligente\u201d com o advento da capacidade do Sistema de Posicionamento Global (GPS) para uso civil.<\/p>\n<p>Com essa tecnologia, os agricultores t\u00eam conseguido mapear campos de cultivo com mais precis\u00e3o do que nunca, o que, por sua vez, permite o monitoramento das condi\u00e7\u00f5es de campo para aplica\u00e7\u00e3o de fertilizantes e tratamentos de ervas daninhas para atender \u00e0s necessidades espec\u00edficas das plantas. Os primeiros usu\u00e1rios de agricultura de precis\u00e3o se beneficiaram do monitoramento de cultivos para obter recomenda\u00e7\u00f5es ideais de fertilizantes e corre\u00e7\u00e3o de pH.<\/p>\n<p>Para relembrar, h\u00e1 quatro categorias gerais de tecnologias de detec\u00e7\u00e3o sendo empregadas na agricultura comercial:<\/p>\n<p><em>Sensores de localiza\u00e7\u00e3o<\/em>, que usam sinais de sat\u00e9lite GPS para determinar latitude, longitude e altitude de terras agr\u00edcolas.<\/p>\n<p><em>Sensores \u00f3pticos<\/em>, que usam luz para medir propriedades do solo. Os sensores medem diferentes frequ\u00eancias de reflet\u00e2ncia de luz e podem ajudar a analisar argila, mat\u00e9ria org\u00e2nica e n\u00edveis de umidade no solo.<\/p>\n<p><em>Sensores eletroqu\u00edmicos<\/em>, que detectam \u00edons espec\u00edficos no solo para fornecer informa\u00e7\u00f5es sobre o pH e os n\u00edveis de nutrientes do solo.<\/p>\n<p><em>Sensores mec\u00e2nicos<\/em>, que medem a compacta\u00e7\u00e3o do solo. Tensi\u00f4metros, um tipo popular de sensor mec\u00e2nico para planejamento de irriga\u00e7\u00e3o, detectam a for\u00e7a usada pelas ra\u00edzes na absor\u00e7\u00e3o de \u00e1gua.<\/p>\n<p>\u00c9 o trabalho que utiliza sensores mec\u00e2nicos baseados em tensi\u00f4metros, relativamente baratos, em particular, que est\u00e1 levando a alguns dos maiores avan\u00e7os tanto no gerenciamento da irriga\u00e7\u00e3o quanto na produ\u00e7\u00e3o agr\u00edcola.<\/p>\n<h2>Irriga\u00e7\u00e3o e tratamento do solo no \u00fanico deserto da Europa<\/h2>\n<p>Almeria \u00e9 uma \u00e1rea \u00e1rida nas terras \u00e1ridas do sudeste da Espanha, perto do Desierto de Tabernas, que \u00e9 frequentemente chamado de &quot;\u00fanico deserto da Europa continental&quot;. Almeria tamb\u00e9m abriga a maior concentra\u00e7\u00e3o de estufas do mundo, onde s\u00e3o cultivadas hortali\u00e7as como tomate, piment\u00e3o, mel\u00e3o, pepino, berinjela e abobrinha.<\/p>\n<p>Devido \u00e0s condi\u00e7\u00f5es adversas, o uso ideal da \u00e1gua em Almeria exige t\u00e9cnicas de irriga\u00e7\u00e3o e \u00e1gua rigorosas. A irriga\u00e7\u00e3o por gotejamento melhorou a forma como os agricultores usam a \u00e1gua de forma eficiente, mas o gerenciamento ainda tem sido amplamente baseado na experi\u00eancia pr\u00e1tica dos agricultores, com pouco suporte cient\u00edfico para os protocolos sendo usados.<\/p>\n<p>A Universidade de Almeria e a Estacion Eperimental \u201cLas Palmerillas\u201d t\u00eam conduzido pesquisas sobre o uso de sensores de umidade do solo para o manejo da irriga\u00e7\u00e3o na \u00e1rea. Os tensi\u00f4metros s\u00e3o usados como refer\u00eancia para avaliar e desenvolver protocolos para o manejo da irriga\u00e7\u00e3o. Os tensi\u00f4metros medem o teor de umidade do solo e acionam a irriga\u00e7\u00e3o por meio de uma fita gotejadora de linha dupla espa\u00e7ada aproximadamente a cada quatro p\u00e9s.<\/p>\n<p>Os pesquisadores monitoram continuamente esses sensores para identificar per\u00edodos de irriga\u00e7\u00e3o excessiva e insuficiente. Os agricultores locais agora t\u00eam uma maneira de calibrar suas estrat\u00e9gias de irriga\u00e7\u00e3o de acordo com as condi\u00e7\u00f5es do solo e das culturas. Um melhor controle da irriga\u00e7\u00e3o levou a um melhor controle de custos, minimizou o desperd\u00edcio de \u00e1gua e otimizou os n\u00edveis de \u00e1gua na zona radicular.<\/p>\n<p>Mas as estrat\u00e9gias de irriga\u00e7\u00e3o n\u00e3o s\u00e3o suficientes para melhorar a agricultura, sem considerar tamb\u00e9m a corre\u00e7\u00e3o do solo.<\/p>\n<p>A \u00e1gua local nesta comunidade agr\u00edcola tem um alto n\u00edvel de salinidade (acima de 4000 mS\/cm). A irriga\u00e7\u00e3o tamb\u00e9m exige um tratamento de \u00e1gua complicado, exigindo que a \u00e1gua passe por um sistema de osmose reversa. Isso compreensivelmente aumenta consideravelmente o custo da \u00e1gua no momento em que ela chega \u00e0 planta\u00e7\u00e3o.<\/p>\n<p>Para gerenciar o custo da irriga\u00e7\u00e3o com \u00e1gua, agora calculado de forma mais cient\u00edfica usando tensi\u00f4metros, um grupo de produtores em Almeria tamb\u00e9m realizou um teste de surfactantes de solo para determinar em que grau a aplica\u00e7\u00e3o poderia reduzir a quantidade de \u00e1gua, mantendo a qualidade e o rendimento da colheita.<\/p>\n<p>Na primavera de 2014, fazendeiros fizeram testes em aproximadamente 5 acres de uma safra comercial de mel\u00e3o na regi\u00e3o. O teste envolveu surfactante de solo aplicado em intervalos espec\u00edficos:<\/p>\n<ul>\n<li>32 oz por acre ap\u00f3s o plantio<\/li>\n<li>16 oz por acre duas semanas ap\u00f3s o plantio<\/li>\n<li>16 oz por acre quatro semanas ap\u00f3s o plantio<\/li>\n<\/ul>\n<p>Ap\u00f3s apenas quatro semanas seguindo esse programa cuidadosamente controlado, as leituras do tensi\u00f4metro detectaram n\u00edveis de umidade suficientes. Nesse ponto, a irriga\u00e7\u00e3o na \u00e1rea tratada foi interrompida por nove dias. Os intervalos de irriga\u00e7\u00e3o depois disso foram reduzidos de 1,5 hora por dia para 20 minutos por dia.<\/p>\n<p>Os agricultores participantes do programa descobriram que, daquele ponto at\u00e9 a colheita, o crescimento da cultura exigia apenas 20 minutos de irriga\u00e7\u00e3o por dia, reduzindo o que era necess\u00e1rio para o cultivo.<\/p>\n<p>Resultados semelhantes (isto \u00e9, a capacidade de reduzir o tempo e a quantidade de irriga\u00e7\u00e3o com o uso de surfactantes de solo) foram observados em outras partes do mundo, incluindo os Estados Unidos. \u00c1reas onde a disponibilidade de \u00e1gua \u00e9 um fator (o Aqu\u00edfero Ogallala, ou partes da Calif\u00f3rnia, por exemplo) ou regi\u00f5es que t\u00eam que pagar pela \u00e1gua \u2013 ou onde o aumento dos custos de energia \u00e9 um fator \u2013 se beneficiaram do uso dessas ferramentas para gerenciar o uso da \u00e1gua.<\/p>\n<h2>A combina\u00e7\u00e3o para redu\u00e7\u00e3o do consumo de \u00e1gua e melhores rendimentos<\/h2>\n<p>A tecnologia moderna pode auxiliar na irriga\u00e7\u00e3o, pois sensores de umidade e tensi\u00f4metros permitem que os produtores monitorem e gerenciem os n\u00edveis de umidade. Embora esses avan\u00e7os possam ajudar a avaliar as condi\u00e7\u00f5es do solo, eles n\u00e3o s\u00e3o suficientes para manter e aumentar os rendimentos.<\/p>\n<p>Mudan\u00e7as nas condi\u00e7\u00f5es clim\u00e1ticas, assim como as condi\u00e7\u00f5es naturais em \u00e1reas de cultivo no mundo todo, afetam a qualidade da \u00e1gua usada para irriga\u00e7\u00e3o na agricultura e a capacidade do solo de fazer uso dessa \u00e1gua. O monitoramento pode fornecer uma compreens\u00e3o das condi\u00e7\u00f5es da \u00e1gua e gerenciar melhor seu uso, mas deve andar de m\u00e3os dadas com estrat\u00e9gias apropriadas para melhor condicionar o solo para aceitar irriga\u00e7\u00e3o.<\/p>\n<p>Uma combina\u00e7\u00e3o de sensores e monitores \u00e9 o primeiro passo certo para ajudar os agricultores a avaliar os n\u00edveis de umidade, salinidade, requisitos de fertilizantes e muito mais. A partir da\u00ed, corretivos de solo e aplica\u00e7\u00f5es como surfactantes de solo podem melhorar o uso de \u00e1gua na agricultura, para melhorar o rendimento, poupando o uso excessivo de \u00e1gua em um momento de crescente demanda global pelo recurso.<\/p>","protected":false},"excerpt":{"rendered":"<p>De acordo com globalagriculture.org, a agricultura est\u00e1 consumindo a \u00e1gua doce dispon\u00edvel na Terra a uma taxa surpreendente: 70% de \u201c\u00e1gua azul\u201d de\u2026<\/p>","protected":false},"author":110,"featured_media":62268,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[29,5],"tags":[578],"class_list":["post-62267","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-europe","category-markets","tag-precision-agriculture"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - 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