{"id":2663,"date":"2025-02-18T08:38:22","date_gmt":"2025-02-18T08:38:22","guid":{"rendered":"https:\/\/paul-tech.com\/?p=2663"},"modified":"2026-03-12T15:41:05","modified_gmt":"2026-03-12T15:41:05","slug":"mita-tapahtuu-maatalousmaille-talvella","status":"publish","type":"post","link":"https:\/\/paul-tech.com\/fi\/mita-tapahtuu-maatalousmaille-talvella\/","title":{"rendered":"Mit\u00e4 tapahtuu maatalousmaille talvella?"},"content":{"rendered":"<div class=\"wp-block-post-date\"><time datetime=\"2025-02-18T08:38:22+00:00\">February 18, 2025<\/time><\/div>\n\n\n<ul class=\"wp-block-social-links is-layout-flex wp-block-social-links-is-layout-flex\"><li class=\"wp-social-link wp-social-link-facebook  wp-block-social-link\"><a rel=\"noopener nofollow\" target=\"_blank\" href=\"https:\/\/www.facebook.com\/PaulTechEstonia\" class=\"wp-block-social-link-anchor\"><svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" 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c0-0.855,0.691-1.548,1.549-1.548c0.854,0,1.547,0.694,1.547,1.548C8.551,7.881,7.858,8.574,7.004,8.574z M18.339,18.338h-2.669 v-4.177c0-0.996-0.017-2.278-1.387-2.278c-1.389,0-1.601,1.086-1.601,2.206v4.249h-2.667v-8.59h2.559v1.174h0.037 c0.356-0.675,1.227-1.387,2.526-1.387c2.703,0,3.203,1.779,3.203,4.092V18.338z\"><\/path><\/svg><span class=\"wp-block-social-link-label screen-reader-text\">LinkedIn<\/span><\/a><\/li>\n\n<li class=\"wp-social-link wp-social-link-instagram  wp-block-social-link\"><a rel=\"noopener nofollow\" target=\"_blank\" href=\"https:\/\/www.instagram.com\/paultech_esoil\/\" class=\"wp-block-social-link-anchor\"><svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M12,4.622c2.403,0,2.688,0.009,3.637,0.052c0.877,0.04,1.354,0.187,1.671,0.31c0.42,0.163,0.72,0.358,1.035,0.673 c0.315,0.315,0.51,0.615,0.673,1.035c0.123,0.317,0.27,0.794,0.31,1.671c0.043,0.949,0.052,1.234,0.052,3.637 s-0.009,2.688-0.052,3.637c-0.04,0.877-0.187,1.354-0.31,1.671c-0.163,0.42-0.358,0.72-0.673,1.035 c-0.315,0.315-0.615,0.51-1.035,0.673c-0.317,0.123-0.794,0.27-1.671,0.31c-0.949,0.043-1.233,0.052-3.637,0.052 s-2.688-0.009-3.637-0.052c-0.877-0.04-1.354-0.187-1.671-0.31c-0.42-0.163-0.72-0.358-1.035-0.673 c-0.315-0.315-0.51-0.615-0.673-1.035c-0.123-0.317-0.27-0.794-0.31-1.671C4.631,14.688,4.622,14.403,4.622,12 s0.009-2.688,0.052-3.637c0.04-0.877,0.187-1.354,0.31-1.671c0.163-0.42,0.358-0.72,0.673-1.035 c0.315-0.315,0.615-0.51,1.035-0.673c0.317-0.123,0.794-0.27,1.671-0.31C9.312,4.631,9.597,4.622,12,4.622 M12,3 C9.556,3,9.249,3.01,8.289,3.054C7.331,3.098,6.677,3.25,6.105,3.472C5.513,3.702,5.011,4.01,4.511,4.511 c-0.5,0.5-0.808,1.002-1.038,1.594C3.25,6.677,3.098,7.331,3.054,8.289C3.01,9.249,3,9.556,3,12c0,2.444,0.01,2.751,0.054,3.711 c0.044,0.958,0.196,1.612,0.418,2.185c0.23,0.592,0.538,1.094,1.038,1.594c0.5,0.5,1.002,0.808,1.594,1.038 c0.572,0.222,1.227,0.375,2.185,0.418C9.249,20.99,9.556,21,12,21s2.751-0.01,3.711-0.054c0.958-0.044,1.612-0.196,2.185-0.418 c0.592-0.23,1.094-0.538,1.594-1.038c0.5-0.5,0.808-1.002,1.038-1.594c0.222-0.572,0.375-1.227,0.418-2.185 C20.99,14.751,21,14.444,21,12s-0.01-2.751-0.054-3.711c-0.044-0.958-0.196-1.612-0.418-2.185c-0.23-0.592-0.538-1.094-1.038-1.594 c-0.5-0.5-1.002-0.808-1.594-1.038c-0.572-0.222-1.227-0.375-2.185-0.418C14.751,3.01,14.444,3,12,3L12,3z M12,7.378 c-2.552,0-4.622,2.069-4.622,4.622S9.448,16.622,12,16.622s4.622-2.069,4.622-4.622S14.552,7.378,12,7.378z M12,15 c-1.657,0-3-1.343-3-3s1.343-3,3-3s3,1.343,3,3S13.657,15,12,15z M16.804,6.116c-0.596,0-1.08,0.484-1.08,1.08 s0.484,1.08,1.08,1.08c0.596,0,1.08-0.484,1.08-1.08S17.401,6.116,16.804,6.116z\"><\/path><\/svg><span class=\"wp-block-social-link-label screen-reader-text\">Instagram<\/span><\/a><\/li>\n\n<li class=\"wp-social-link wp-social-link-youtube  wp-block-social-link\"><a rel=\"noopener nofollow\" target=\"_blank\" href=\"https:\/\/www.youtube.com\/@paul-tech_esoil\" class=\"wp-block-social-link-anchor\"><svg width=\"24\" height=\"24\" viewBox=\"0 0 24 24\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M21.8,8.001c0,0-0.195-1.378-0.795-1.985c-0.76-0.797-1.613-0.801-2.004-0.847c-2.799-0.202-6.997-0.202-6.997-0.202 h-0.009c0,0-4.198,0-6.997,0.202C4.608,5.216,3.756,5.22,2.995,6.016C2.395,6.623,2.2,8.001,2.2,8.001S2,9.62,2,11.238v1.517 c0,1.618,0.2,3.237,0.2,3.237s0.195,1.378,0.795,1.985c0.761,0.797,1.76,0.771,2.205,0.855c1.6,0.153,6.8,0.201,6.8,0.201 s4.203-0.006,7.001-0.209c0.391-0.047,1.243-0.051,2.004-0.847c0.6-0.607,0.795-1.985,0.795-1.985s0.2-1.618,0.2-3.237v-1.517 C22,9.62,21.8,8.001,21.8,8.001z M9.935,14.594l-0.001-5.62l5.404,2.82L9.935,14.594z\"><\/path><\/svg><span class=\"wp-block-social-link-label screen-reader-text\">YouTube<\/span><\/a><\/li>\n\n<li class=\"wp-social-link wp-social-link-tiktok  wp-block-social-link\"><a rel=\"noopener nofollow\" target=\"_blank\" href=\"https:\/\/www.tiktok.com\/@paultech_soil\" class=\"wp-block-social-link-anchor\"><svg width=\"24\" height=\"24\" viewBox=\"0 0 32 32\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M16.708 0.027c1.745-0.027 3.48-0.011 5.213-0.027 0.105 2.041 0.839 4.12 2.333 5.563 1.491 1.479 3.6 2.156 5.652 2.385v5.369c-1.923-0.063-3.855-0.463-5.6-1.291-0.76-0.344-1.468-0.787-2.161-1.24-0.009 3.896 0.016 7.787-0.025 11.667-0.104 1.864-0.719 3.719-1.803 5.255-1.744 2.557-4.771 4.224-7.88 4.276-1.907 0.109-3.812-0.411-5.437-1.369-2.693-1.588-4.588-4.495-4.864-7.615-0.032-0.667-0.043-1.333-0.016-1.984 0.24-2.537 1.495-4.964 3.443-6.615 2.208-1.923 5.301-2.839 8.197-2.297 0.027 1.975-0.052 3.948-0.052 5.923-1.323-0.428-2.869-0.308-4.025 0.495-0.844 0.547-1.485 1.385-1.819 2.333-0.276 0.676-0.197 1.427-0.181 2.145 0.317 2.188 2.421 4.027 4.667 3.828 1.489-0.016 2.916-0.88 3.692-2.145 0.251-0.443 0.532-0.896 0.547-1.417 0.131-2.385 0.079-4.76 0.095-7.145 0.011-5.375-0.016-10.735 0.025-16.093z\" \/><\/svg><span class=\"wp-block-social-link-label screen-reader-text\">TikTok<\/span><\/a><\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"902\" height=\"558\" src=\"https:\/\/paul-tech.com\/wp-content\/uploads\/2025\/01\/1000_F_299734641_xCYuzDW1C53y1Xgga92ISLCER6UoZ5sN-2-1.jpg\" alt=\"Paul-Tech soil freezing data in winter conditions\" class=\"wp-image-2484\" srcset=\"https:\/\/paul-tech.com\/wp-content\/uploads\/2025\/01\/1000_F_299734641_xCYuzDW1C53y1Xgga92ISLCER6UoZ5sN-2-1.jpg 902w, https:\/\/paul-tech.com\/wp-content\/uploads\/2025\/01\/1000_F_299734641_xCYuzDW1C53y1Xgga92ISLCER6UoZ5sN-2-1-300x186.jpg 300w, https:\/\/paul-tech.com\/wp-content\/uploads\/2025\/01\/1000_F_299734641_xCYuzDW1C53y1Xgga92ISLCER6UoZ5sN-2-1-768x475.jpg 768w\" sizes=\"auto, (max-width: 902px) 100vw, 902px\" \/><\/figure>\n\n\n\n<p>Maan kunto talvella \u2013 mukaan lukien j\u00e4\u00e4tymis-sulamissyklit ja l\u00e4mp\u00f6tilavaihtelut eri syvyyksiss\u00e4 \u2013 vaikuttaa merkitt\u00e4v\u00e4sti talvehtivien viljelykasvien selviytymiseen. Ne vaikuttavat mm.&nbsp; juuriston mekaanisiin vaurioihin, tuholaisten ja tautien eloonj\u00e4\u00e4ntiin, ravinteiden pid\u00e4ttymiseen ja huuhtoutumiseen sek\u00e4 eroosioprosesseihin.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Tekij\u00e4t, jotka vaikuttavat maan j\u00e4\u00e4tymisprosessiin<\/strong><\/h2>\n\n\n\n<p>Maan ja maaper\u00e4n j\u00e4\u00e4tymiseen vaikuttavat ensisijaisesti seuraavat tekij\u00e4t:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ulkol\u00e4mp\u00f6tila<\/li>\n\n\n\n<li>Lumipeitteen olemassaolo tai puuttuminen<\/li>\n\n\n\n<li>Maaper\u00e4n koostumus<\/li>\n\n\n\n<li>Maan kosteuspitoisuus ennen j\u00e4\u00e4tymist\u00e4<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Fyysiset prosessit maan j\u00e4\u00e4tyess\u00e4<\/strong><\/h2>\n\n\n\n<p>Veden j\u00e4\u00e4tyminen on hyvin paljon tutkittu fysikaalinen ilmi\u00f6. J\u00e4\u00e4tymisen aikana veden molekyylien liike-energia v\u00e4henee niin paljon, ett\u00e4 molekyylivoimat voittavat niiden liikkeen ja muodostavat j\u00e4yk\u00e4n kiteisen rakenteen. J\u00e4\u00e4n muodostuessa molekyylien keskim\u00e4\u00e4r\u00e4inen et\u00e4isyys kasvaa, mik\u00e4 johtaa j\u00e4\u00e4n alhaisempaan tiheyteen verrattuna nestem\u00e4iseen veteen \u2013 t\u00e4st\u00e4 syyst\u00e4 j\u00e4\u00e4 kelluu veden pinnalla. T\u00e4m\u00e4 prosessi tapahtuu tarkasti 0 \u00b0C:ssa ja on jyrkk\u00e4 olomuodon muutos nestem\u00e4isest\u00e4 kiinte\u00e4ksi.<\/p>\n\n\n\n<p>J\u00e4\u00e4tyminen ja sulaminen ovat eritt\u00e4in energiaintensiivisi\u00e4 prosesseja \u2013 veden j\u00e4hmettymisen\/sulamisen latenttil\u00e4mp\u00f6 on 330 000 kJ\/kg, kun taas veden ominaisl\u00e4mp\u00f6kapasiteetti on 4180 J\/kg\u00b0C. J\u00e4\u00e4n l\u00e4mp\u00f6tila alkaa laskea alle 0 \u00b0C vasta, kun kaikki vesi on j\u00e4\u00e4tynyt.<\/p>\n\n\n\n<p>Maaper\u00e4ss\u00e4 j\u00e4\u00e4tymisprosessi on monimutkaisempi, koska kaikki vesi ei ole vapaata. Raskaammat, enemm\u00e4n savea sis\u00e4lt\u00e4v\u00e4t maat sis\u00e4lt\u00e4v\u00e4t enemm\u00e4n sitoutunutta vett\u00e4, jonka j\u00e4\u00e4tyminen eroaa vapaan veden j\u00e4\u00e4tymisest\u00e4. K\u00e4yt\u00e4nn\u00f6ss\u00e4 t\u00e4m\u00e4 tarkoittaa, ett\u00e4 savipitoiset maat j\u00e4\u00e4tyv\u00e4t hitaammin ja jonkin verran vett\u00e4 pysyy sulana kaikissa maatyypeiss\u00e4 koko talven ajan.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Paul-Techin mittaukset ja havainnot<\/strong><\/h2>\n\n\n\n<p>Paul-Techin laaja talvikauden maaper\u00e4data tarjoaa arvokkaita n\u00e4kemyksi\u00e4 maan k\u00e4ytt\u00e4ytymisest\u00e4 talven aikana. Pitk\u00e4aikaiset mittauksemme paljastavat toistuvia kaavoja eri maatyypeiss\u00e4. Tyypillisesti maa on kyll\u00e4stetty vedell\u00e4 ennen j\u00e4\u00e4tymist\u00e4 syksyll\u00e4, ja t\u00e4m\u00e4n suuren vesim\u00e4\u00e4r\u00e4n j\u00e4\u00e4tyminen vaatii runsaasti energiaa. Koska veden j\u00e4\u00e4tymislatenttil\u00e4mp\u00f6 on korkea, maaper\u00e4n vesi toimii l\u00e4mp\u00f6tilapuskurina noin 0 \u00b0C:ssa. P\u00e4\u00e4asiassa routa-alueilla on havaittu seuraavia yleisi\u00e4 trendej\u00e4:<\/p>\n\n\n\n<p><strong>L\u00e4mp\u00f6tilat 8 cm ja 20 cm syvyydess\u00e4 pysyv\u00e4t noin 0 \u00b0C:ssa koko talven ajan<\/strong>, koska veden korkea j\u00e4\u00e4tymispiste vaimentaa l\u00e4mp\u00f6tilavaihteluita. T\u00e4m\u00e4 her\u00e4tt\u00e4\u00e4 kysymyksi\u00e4 tuholaisten tuhoutumisen todenn\u00e4k\u00f6isyydest\u00e4 talvipakkasten seurauksena.<\/p>\n\n\n\n<p><strong>Useita j\u00e4\u00e4tymis-sulamissyklej\u00e4 tapahtuu talven aikana<\/strong>, erityisesti 8 cm syvyydell\u00e4. N\u00e4m\u00e4 syklit eiv\u00e4t merkitt\u00e4v\u00e4sti muuta maaper\u00e4n l\u00e4mp\u00f6tilaa, mutta voivat aiheuttaa roustetta, mik\u00e4 voi vahingoittaa kasvien juuristoa. N\u00e4iden syklien aikana vesi k\u00e4y l\u00e4pi olomuodon muutoksia nestem\u00e4isest\u00e4 kiinte\u00e4ksi ja takaisin.<\/p>\n\n\n\n<p><strong>Maaper\u00e4n l\u00e4mp\u00f6tila laskee alle 0 \u00b0C vain silloin, kun maa on laajalti j\u00e4\u00e4tynyt.<\/strong> T\u00e4ss\u00e4kin tapauksessa ilman lumipeitett\u00e4 8 cm syvyydess\u00e4 mitattu minimil\u00e4mp\u00f6tila on ollut noin -4 \u00b0C.<\/p>\n\n\n\n<p><strong>Lumen peitt\u00e4ess\u00e4 maan se pysyy sulana, s\u00e4ilytt\u00e4en 0\u20131 \u00b0C l\u00e4mp\u00f6tilan.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Tarkka arvio maan tilasta<\/strong><\/h2>\n\n\n\n<p>Paras tapa m\u00e4\u00e4ritt\u00e4\u00e4, onko maaper\u00e4 j\u00e4\u00e4ss\u00e4 vai sulana, on tarkastella Paul-Techin \u201dsaatavuus\u201d lukemia (j), jotka perustuvat maaper\u00e4n s\u00e4hk\u00f6njohtavuuden suoriin mittauksiin, sek\u00e4 maan vesipitoisuuskaavioita. N\u00e4m\u00e4 mittaukset auttavat my\u00f6s arvioimaan, kuinka suuri osa vedest\u00e4 on j\u00e4\u00e4tym\u00e4t\u00f6nt\u00e4 maaper\u00e4ss\u00e4. Pelkk\u00e4 maaper\u00e4n l\u00e4mp\u00f6tilan mittaaminen ei anna kattavaa kuvaa maan tilasta.<\/p>\n\n\n\n<p>Talvikauden aikana s\u00e4hk\u00f6njohtavuuden ja maaper\u00e4n vesipitoisuuden vaihtelut johtuvat osittaisesta veden j\u00e4\u00e4tymisest\u00e4, eiv\u00e4tk\u00e4 merkitt\u00e4vist\u00e4 muutoksista maan kosteudessa tai johtavuudessa. Rousteen (juurivaurioiden) riski on suurempi hietamaissa, joissa on kosteutta ennen j\u00e4\u00e4tymist\u00e4, ja alueilla, joissa esiintyy kev\u00e4\u00e4ll\u00e4 runsaasti j\u00e4\u00e4tymis-sulamissyklej\u00e4.<\/p>\n\n\n\n<p>Lumen peitt\u00e4m\u00e4tt\u00f6mill\u00e4 mailla l\u00e4mp\u00f6tilagradientti pinnasta 8 cm syvyyteen on lineaarinen. Esimerkiksi, jos ilman l\u00e4mp\u00f6tila on -10 \u00b0C, 8 cm syvyydess\u00e4 l\u00e4mp\u00f6tila on 0 \u00b0C, ja maa on suurelta osin j\u00e4\u00e4tynyt. 4 cm syvyydess\u00e4 maan l\u00e4mp\u00f6tila olisi t\u00e4ll\u00f6in noin -4 \u00b0C.<\/p>\n\n\n\n<p>Paul-Techin mittauksia hy\u00f6dynt\u00e4m\u00e4ll\u00e4 viljelij\u00e4t voivat ymm\u00e4rt\u00e4\u00e4 paremmin maaper\u00e4n k\u00e4ytt\u00e4ytymist\u00e4 talvella ja tehd\u00e4 parempia p\u00e4\u00e4t\u00f6ksi\u00e4 viljelykasvien hallinnasta ja maaper\u00e4n terveydest\u00e4.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Maan kunto talvella \u2013 mukaan lukien j\u00e4\u00e4tymis-sulamissyklit ja l\u00e4mp\u00f6tilavaihtelut eri syvyyksiss\u00e4 \u2013 vaikuttaa merkitt\u00e4v\u00e4sti talvehtivien viljelykasvien selviytymiseen. Ne vaikuttavat mm.&nbsp;&#8230;<\/p>\n","protected":false},"author":3,"featured_media":2484,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-2663","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized-fi"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Mit\u00e4 tapahtuu maatalousmaille talvella? - Paul-Tech<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/paul-tech.com\/fi\/mita-tapahtuu-maatalousmaille-talvella\/\" \/>\n<meta property=\"og:locale\" content=\"fi_FI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mit\u00e4 tapahtuu maatalousmaille talvella? - Paul-Tech\" \/>\n<meta property=\"og:description\" content=\"Maan kunto talvella \u2013 mukaan lukien j\u00e4\u00e4tymis-sulamissyklit ja l\u00e4mp\u00f6tilavaihtelut eri syvyyksiss\u00e4 \u2013 vaikuttaa merkitt\u00e4v\u00e4sti talvehtivien viljelykasvien selviytymiseen. 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