{"id":25813,"date":"2019-04-18T16:07:03","date_gmt":"2019-04-18T14:07:03","guid":{"rendered":"https:\/\/www.bioecoactual.com\/?p=25813"},"modified":"2019-04-18T16:07:03","modified_gmt":"2019-04-18T14:07:03","slug":"perills-fertilitzants-quimics","status":"publish","type":"post","link":"https:\/\/www.bioecoactual.com\/ca\/2019\/04\/18\/perills-fertilitzants-quimics\/","title":{"rendered":"Els perills dels fertilitzants qu\u00edmics"},"content":{"rendered":"<p>Un dels temes m\u00e9s pol\u00e8mics del que podem tractar \u00e9s el dels fertilitzants qu\u00edmics i el seu \u00fas per a la producci\u00f3 d&#8217;aliments. Els efectes dels fertilitzants qu\u00edmics sobre el medi ambient estan \u00e0mpliament provats i s\u00f3n inq\u00fcestionables, estant demostrat que el seu \u00fas comporta un risc elevat de danys ambientals, com s\u00f3n la <strong>contaminaci\u00f3 de les aig\u00fces subterr\u00e0nies i del s\u00f2l sobre els quals s&#8217;apliquen<\/strong>. Del que no es parla tant \u00e9s del <strong>risc que sobre la salut de les persones poden implicar els fertilitzants qu\u00edmics<\/strong>. Sabem quins riscos comporta el seu \u00fas sobre el medi ambient per\u00f2 encara no estem del tot segurs dels riscos que suposa per a la nostra pr\u00f2pia salut.<br \/>\n<!--more--><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-25810\" src=\"https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2019\/04\/fertilizers2.jpg\" alt=\"peligros de los fertilizantes qu\u00edmicos perills dels fertilitzants qu\u00edmics\" width=\"1200\" height=\"800\" srcset=\"https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2019\/04\/fertilizers2.jpg 1200w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2019\/04\/fertilizers2-768x512.jpg 768w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2019\/04\/fertilizers2-696x464.jpg 696w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2019\/04\/fertilizers2-1068x712.jpg 1068w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2019\/04\/fertilizers2-630x420.jpg 630w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<p>Per entendre objectivament aquest assumpte necessitem con\u00e8ixer el que \u00e9s un fertilitzant qu\u00edmic i com actua la fertilitzaci\u00f3 qu\u00edmica. Per fertilitzant es coneix qualsevol subst\u00e0ncia que \u00e9s utilitzada per aportar nutrients al s\u00f2l, i l&#8217;objectiu \u00e9s augmentar la concentraci\u00f3 dels mateixos que afavoreixi i potenci\u00ef el creixement de les plantes. Aquest \u00e9s l&#8217;\u00fanic objectiu d&#8217;un fertilitzant, independentment de com repercuteixi sobre el s\u00f2l o la resta de factors ambientals sobre els quals incideixi. Ni tots els fertilitzants actuen igual, ni tots els fertilitzants s\u00f3n saludables per al s\u00f2l i el medi ambient.<\/p>\n<p>La salut del s\u00f2l est\u00e0 basada en un balan\u00e7 complex entre macronutrients, micronutrients i la flora microbiana, el conjunt de bacteris i fongs del s\u00f2l que li aporten fertilitat i actuen com a consumidors de CO2. \u00c9s un proc\u00e9s natural molt m\u00e9s complicat que purament aportar nitrogen, f\u00f2sfor i potassi (NPK) al terra en les dosis i concentracions recomanades per cultiu i superf\u00edcie. I \u00e9s que la ci\u00e8ncia encara no coneix completament els processos i requeriments nutricionals del s\u00f2l. Els t\u00e8cnics encarregats de la producci\u00f3 agr\u00edcola s&#8217;han centrat gaireb\u00e9 exclusivament en NPK des del seu descobriment a mitjans del segle XIX. \u00c9s aquesta visi\u00f3 reduccionista tan estesa la que porta a pensar que entenem al 100% la qu\u00edmica del s\u00f2l i la que \u00fanicament vol abordar la fertilitzaci\u00f3 del s\u00f2l per a la producci\u00f3 vegetal amb l&#8217;aplicaci\u00f3 intensiva de fertilitzants qu\u00edmics.<\/p>\n<p>Per\u00f2 \u00e9s evident que conforme les pr\u00e0ctiques agr\u00edcoles no sostenibles van en augment el nostre s\u00f2l est\u00e0 sent despullat de la seva salut, els nostres aq\u00fc\u00edfers s&#8217;estan contaminant, i els nostres cultius depenen d&#8217;aportacions cada vegada m\u00e9s grans de qu\u00edmics. I aquestes pr\u00e0ctiques agr\u00edcoles basades en l&#8217;\u00fas de fertilitzants qu\u00edmics comporten efectes molt negatius. El major problema a qu\u00e8 ens enfrontem \u00e9s la contaminaci\u00f3 de l&#8217;aigua subterr\u00e0nia produ\u00efda pel nitrogen que s&#8217;afegeix en forma de nitrats. Els nitrats aportats al s\u00f2l es mouen f\u00e0cilment a trav\u00e9s d&#8217;ell, i pel fet que s\u00f3n molt solubles en aigua, passen a les aig\u00fces subterr\u00e0nies i romanen en elles durant anys, i el que \u00e9s pitjor, l&#8217;aportaci\u00f3 de nitrogen al llarg del temps t\u00e9 un efecte acumulatiu. Un altre fertilitzant d&#8217;ampli \u00fas, la urea, allibera amon\u00edac en el seu proc\u00e9s de descomposici\u00f3. Una part de l&#8217;amon\u00edac passa a l&#8217;atmosfera contribuint a la pluja \u00e0cida i una altra part contamina l&#8217;aigua subterr\u00e0nia. I lluny de disminuir, s\u00f3n problemes que es veuran augmentats en les pr\u00f2ximes d\u00e8cades.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-25811\" src=\"https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2019\/04\/fertilizers.jpg\" alt=\"\" width=\"1200\" height=\"1198\" srcset=\"https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2019\/04\/fertilizers.jpg 1200w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2019\/04\/fertilizers-768x767.jpg 768w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2019\/04\/fertilizers-696x695.jpg 696w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2019\/04\/fertilizers-1068x1066.jpg 1068w, https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2019\/04\/fertilizers-421x420.jpg 421w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<h3>La contaminaci\u00f3 de l&#8217;aigua subterr\u00e0nia per nitrogen t\u00e9 efectes greus i perniciosos sobre la salut humana<\/h3>\n<p>S&#8217;ha relacionat amb el c\u00e0ncer g\u00e0stric, el goll, les malformacions de naixement, la hipertensi\u00f3 i el c\u00e0ncer de testicle. Encara que l&#8217;efecte millor conegut que sobre la salut t\u00e9 el consum d&#8217;aigua contaminada per nitrats \u00e9s la <em>metahemoglobin\u00e8mia<\/em>. La <em>metahemoglobin\u00e8mia<\/em> \u00e9s un trastorn sanguini pel qual es produeix una quantitat anormal de metahemoglobina, una forma d&#8217;hemoglobina que t\u00e9 una enorme afinitat per l&#8217;oxigen i que no el cedeix en els teixits. L&#8217;hemoglobina \u00e9s la prote\u00efna dels gl\u00f2buls vermells que transporta i distribueix l&#8217;oxigen al cos.<\/p>\n<p>Amb la <em>metahemoglobin\u00e8mia<\/em> l&#8217;hemoglobina pot transportar l&#8217;oxigen, per\u00f2 \u00e9s incapa\u00e7 d&#8217;alliberar-lo de manera efectiva als teixits corporals. \u00c9s un trastorn especialment pernici\u00f3s per als lactants, que produeix el conegut s\u00edndrome del nad\u00f3 blau, i la causa \u00e9s la disminuci\u00f3 de l&#8217;oxigen a la sang que li produeix cianosi. El risc de patir-lo augmenta exponencialment quan els lactants prenen biber\u00f3 fet amb aigua contaminada amb nitrats.<\/p>\n<p>El segon element en import\u00e0ncia per al creixement de les plantes \u00e9s el f\u00f2sfor, que s&#8217;usa principalment en forma de fosfats. La seva manca limita el creixement de les plantes i impedeix l&#8217;absorci\u00f3 d&#8217;altres elements indispensables per al seu desenvolupament. El problema ambiental dels fosfats \u00e9s que passen del s\u00f2l a l&#8217;aq\u00fc\u00edfer, com el cas del N, produint un fenomen que es coneix com eutrofitzaci\u00f3 de les aig\u00fces. L&#8217;increment de la concentraci\u00f3 de f\u00f2sfor en les aig\u00fces superficials t\u00e9 com a conseq\u00fc\u00e8ncia el creixement exponencial de les algues, que s\u00f3n organismes molt dependents del f\u00f2sfor. La pres\u00e8ncia massiva d&#8217;algues consumeix grans quantitats d&#8217;oxigen i provoca el seu d\u00e8ficit o la seva abs\u00e8ncia en els rius, llacs i embassaments, contribuint a la creaci\u00f3 d&#8217;\u00e0mplies zones mortes. Con\u00e8ixer i comprendre els efectes dels fertilitzants qu\u00edmics sobre la salut humana i el medi ambient ens fa ser conscients dels perills que comporten i ens permet actuar en conseq\u00fc\u00e8ncia per protegir la nostra salut i la del planeta. \u00c9s, per tant, necessari utilitzar la quantitat m\u00ednima de fertilitzants qu\u00edmics en l&#8217;agricultura, horts, jardins i altres instal\u00b7lacions que ho requereixin, i buscar alternatives naturals a aquests compostos. <strong>Alternatives naturals com s\u00f3n els fertilitzants org\u00e0nics, garantia de salut i sostenibilitat.<\/strong><\/p>\n<p><strong>Autor:\u00a0<\/strong>Ra\u00fal Mart\u00ednez, dietista-nutricionista, bi\u00f2leg<\/p>\n<p><strong><em>Bio Eco Actual<\/em><\/strong>,<em>\u00a0el teu mensual 100% ecol\u00f2gic<\/em><strong><br \/>\nLlegir\u00a0<a href=\"https:\/\/www.bioecoactual.com\/wp-content\/uploads\/2019\/03\/BioEcoActual_Abril_Catala_2019.pdf\" target=\"_blank\" rel=\"noopener\">Bio Eco Actual\u00a0Abril 2019<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un dels temes m&eacute;s pol&egrave;mics del que podem tractar &eacute;s el dels fertilitzants qu&iacute;mics i el seu &uacute;s per a la producci&oacute; d&rsquo;aliments. Els efectes dels fertilitzants qu&iacute;mics sobre el medi ambient estan &agrave;mpliament provats i s&oacute;n inq&uuml;estionables, estant demostrat que el seu &uacute;s comporta un risc elevat de danys ambientals, com s&oacute;n la contaminaci&oacute; [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":109488,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7180,7164,7160],"tags":[],"class_list":["post-25813","post","type-post","status-publish","format-standard","has-post-thumbnail","category-activisme","category-actualitat","category-medi-ambient"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.0 (Yoast SEO v28.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Els perills dels fertilitzants qu\u00edmics - Bio Eco Actual<\/title>\n<meta name=\"description\" content=\"Un dels temes m\u00e9s pol\u00e8mics del que podem tractar \u00e9s el dels fertilitzants qu\u00edmics i el seu \u00fas per a la producci\u00f3 d&#039;aliments. 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