{"id":14720,"date":"2026-08-21T06:43:07","date_gmt":"2026-08-21T06:43:07","guid":{"rendered":"https:\/\/edapro.ch\/produce-your-own-slurry-additive-what-lactic-acid-bacteria-achieve-in-slurry-storage\/"},"modified":"2026-08-21T06:43:07","modified_gmt":"2026-08-21T06:43:07","slug":"produce-your-own-slurry-additive-what-lactic-acid-bacteria-achieve-in-slurry-storage","status":"publish","type":"post","link":"https:\/\/edapro.ch\/en\/produce-your-own-slurry-additive-what-lactic-acid-bacteria-achieve-in-slurry-storage\/","title":{"rendered":"Produce Your Own Slurry Additive: What Lactic Acid Bacteria Achieve in Slurry Storage"},"content":{"rendered":"<p style=\"color: #575756; font-size: 19px; line-height: 1.7; margin: 0 0 26px; font-weight: 500;\">In autumn, our brewing system is in continuous operation: 500 liters of <a style=\"color: #7a8a1f; font-weight: 600;\" href=\"https:\/\/edapro.ch\/en\/compost-tea-as-a-foliar-stimulant-what-really-matters\/\">compost tea<\/a> for the neighboring farm, the next batch for our green manures the following week. And when the fields are resting, the machine still doesn&#8217;t stop working. In winter, we use it to produce EM ferments \u2013 as an additive for slurry.  <\/p>\n<h2 style=\"color: #575756; margin: 38px 0 18px; line-height: 1.3;\">Why Slurry Benefits from an Additive<\/h2>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">Slurry is the farm fertilizer you already have. Nevertheless, you lose a portion of it before it even reaches the field: nitrogen escapes into the air or migrates into the groundwater. <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">In my opinion, we are starting at the wrong end when it comes to fertilization. We discuss purchased units and watch nitrogen disappear from storage. Anyone who has experienced the price fluctuations of recent years knows how expensive this dependency is.  <\/p>\n<div style=\"display: flex; gap: 14px; align-items: flex-start; margin: 0 0 18px; padding: 16px 18px; background: #f8f9f2; border-left: 4px solid #b5c334; border-radius: 4px;\">\n<div style=\"font-size: 26px; line-height: 1.2; flex: 0 0 auto;\">\ud83d\udca1<\/div>\n<div style=\"color: #575756;\"><strong style=\"display: block; margin-bottom: 4px; font-size: 17px;\">The Simplest Lever<\/strong>Do not buy more fertilizer, but retain what is already in storage. That is precisely what on-farm ferments are for. <\/div>\n<\/div>\n<h2 style=\"color: #575756; margin: 38px 0 18px; line-height: 1.3;\">Ferment or Compost Tea: The Difference Lies in Oxygen<\/h2>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">Compost tea is aerated. The oxygen content must remain in the aerobic range throughout the entire brewing process \u2013 above 6 mg\/l of dissolved oxygen. This is precisely what makes it a foliar stimulant.  <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">A ferment works in reverse: it operates under anaerobic conditions. Lactic acid bacteria and their companions multiply anaerobically and acidify the batch. <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">This is crucial for slurry. A slurry storage is an anaerobic environment. Aerobic microorganisms from compost tea have no place there. Anaerobic ferments, on the other hand, are at home in this environment.   <\/p>\n<div style=\"display: flex; gap: 14px; align-items: flex-start; margin: 0 0 18px; padding: 16px 18px; background: #f8f9f2; border-left: 4px solid #b5c334; border-radius: 4px;\">\n<div style=\"font-size: 26px; line-height: 1.2; flex: 0 0 auto;\">\ud83d\udd04<\/div>\n<div style=\"color: #575756;\"><strong style=\"display: block; margin-bottom: 4px; font-size: 17px;\">Quick Reminder<\/strong>Compost tea belongs on the leaf and in the soil. Ferments have a positive effect in slurry storage. Both are biostimulants, but they work with different biology.  <\/div>\n<\/div>\n<h2 style=\"color: #575756; margin: 38px 0 18px; line-height: 1.3;\">What Lactic Acid Bacteria Do in Slurry<\/h2>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">Four things happen, and they are interconnected.<\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\"><strong>First, they consume the sugar.<\/strong> Slurry contains carbohydrate residues from feed. Lactic acid bacteria break them down into lactic acid. This deprives putrefactive bacteria of their food source \u2013 preventing them from thriving.  <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\"><strong>Second, the pH drops.<\/strong> The lactic acid acidifies the storage. This is not an end in itself, but the lever for everything else. <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\"><strong>Third, nitrogen remains where it is.<\/strong> The ammonium nitrogen in slurry is in equilibrium with gaseous ammonia. How this equilibrium stands is determined by the pH value. <\/p>\n<figure style=\"margin: 0 0 28px;\"><img decoding=\"async\" loading=\"lazy\" style=\"width: 100%; height: auto; border-radius: 6px; display: block;\" src=\"https:\/\/edapro.ch\/wp-content\/uploads\/2026\/08\/guelle-ammoniak-ph-kurve.jpg\" alt=\"Graph: Proportion of volatile ammonia relative to slurry pH\"><figcaption style=\"color: #8a8a89; font-size: 14px; margin-top: 8px; line-height: 1.5;\">The proportion of volatile ammonia increases with pH. A one-step drop in pH means ten times less NH\u2083. <\/figcaption><\/figure>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">At pH 7.5 \u2013 typical for untreated cattle slurry \u2013 just under one percent of ammonium nitrogen is present as volatile ammonia. At pH 6.5, it is only one-tenth of that. Each pH level down means ten times less of the nitrogen that escapes from your storage. And pH 6.5 is precisely the range we achieve in practice with an EM ferment.   <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\"><strong>Fourth, the bacteria incorporate nitrogen into themselves.<\/strong> What is contained within a bacterial cell cannot off-gas. The nitrogen is biologically bound and is only released back into the soil \u2013 where you want it. <\/p>\n<div style=\"display: flex; gap: 14px; align-items: flex-start; margin: 0 0 18px; padding: 16px 18px; background: #f8f9f2; border-left: 4px solid #b5c334; border-radius: 4px;\">\n<div style=\"font-size: 26px; line-height: 1.2; flex: 0 0 auto;\">\u2697\ufe0f<\/div>\n<div style=\"color: #575756;\"><strong style=\"display: block; margin-bottom: 4px; font-size: 17px;\">Quantity is Key<\/strong>In a trial by HBLFA Raumberg-Gumpenstein, the pH of cattle slurry with whey in a 1:1 ratio dropped to 5.7 \u2013 the water control remained at 7.5. However, a mixing ratio of 1:1 is enormous. How far you get with practical quantities depends on your slurry. Therefore, we prefer to measure rather than estimate.   <\/div>\n<\/div>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">You will see the result in storage before you measure it. The slurry becomes more fluid, fewer crusts and floating layers form, and the putrefactive odor decreases. In the field, it is more plant and soil compatible because it contains fewer corrosive substances: it infiltrates faster and sticks less to the leaves.  <\/p>\n<h2 style=\"color: #575756; margin: 38px 0 18px; line-height: 1.3;\">Who Gives Up in an Acidic Environment<\/h2>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">A slurry storage is also an intermediate storage for pathogens. Streptococci and Klebsiella come from the barn into the slurry as mastitis pathogens, Clostridia and Enterococci via feces and bedding \u2013 and return to the cow via feed and soil. <\/p>\n<figure style=\"margin: 0 0 28px;\"><img decoding=\"async\" loading=\"lazy\" style=\"width: 100%; height: auto; border-radius: 6px; display: block;\" src=\"https:\/\/edapro.ch\/wp-content\/uploads\/2026\/08\/guelle-ph-milieu-mikroorganismen.jpg\" alt=\"pH ranges of lactic acid bacteria, Clostridia, Streptococci, Klebsiella, and Enterococci\"><figcaption style=\"color: #8a8a89; font-size: 14px; margin-top: 8px; line-height: 1.5;\">All four pathogens have their optimum at pH 7 and above \u2013 precisely where untreated slurry lies.<\/figcaption><\/figure>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">Look at where these germs have their optimum: at pH 7 and above. That&#8217;s exactly where untreated slurry is. So, we store it under conditions that suit them perfectly.  <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">With an EM ferment, we reach approximately pH 6.5 in practice. This does not kill anyone. But it removes the optimal range for each of these germs \u2013 while the lactic acid bacteria are still fully active there because their optimum is lower.  <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">In addition, there is a second lever that is often underestimated: the lactic acid bacteria consume the sugars that the others would live on. The pH is what is visible, nutrient competition is what is effective. <\/p>\n<div style=\"display: flex; gap: 14px; align-items: flex-start; margin: 0 0 18px; padding: 16px 18px; background: #f8f9f2; border-left: 4px solid #b5c334; border-radius: 4px;\">\n<div style=\"font-size: 26px; line-height: 1.2; flex: 0 0 auto;\">\u26a0\ufe0f<\/div>\n<div style=\"color: #575756;\"><strong style=\"display: block; margin-bottom: 4px; font-size: 17px;\">Be Honest<\/strong>pH 6.5 displaces, it does not sterilize. Enterococci are particularly tough; you won&#8217;t get rid of them in storage. And Clostridia have the lowest optimum of the four \u2013 you will notice them more through nutrient competition than through pH.  <\/div>\n<\/div>\n<h2 style=\"color: #575756; margin: 38px 0 18px; line-height: 1.3;\">Herbs from Your Own Flower Strip<\/h2>\n<figure style=\"margin: 0 0 28px;\"><img decoding=\"async\" loading=\"lazy\" style=\"width: 100%; height: auto; border-radius: 6px; display: block;\" src=\"https:\/\/edapro.ch\/wp-content\/uploads\/2026\/08\/em-ferment-kraeutersack-brausystem-ansatz.jpg\" alt=\"Herb bag dipped into the EdaLife brewing system batch\"><figcaption style=\"color: #8a8a89; font-size: 14px; margin-top: 8px; line-height: 1.5;\">The herb bag goes into the batch. What grows in the flower strip ends up in the ferment. <\/figcaption><\/figure>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">Our perennial flower strip is not just an insect habitat. Various herbs grow there, which we use as a base for our herb ferments. <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">The process is simple: cut herbs, put them in the net bag, dip the bag into the batch. The plant substances transfer into the water, and the microorganisms multiply on them. <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">The advantage over a purchased product is obvious. You know what&#8217;s in it, you pay almost nothing for it, and the composition suits your location. No canister, no logistics, no waiting time.  <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">Reto Diener from Fr\u00fcchtehof Morgest\u00e4rn does the same on his farm: he propagates lactic acid bacteria directly on the farm, with his own herbs \u2013 in the same <a style=\"color: #7a8a1f; font-weight: 600;\" href=\"https:\/\/edapro.ch\/en\/product-category\/compost-tea\/brewing-systems\/\">EdaLife V500<\/a> that he uses to brew compost tea for his cherries.<\/p>\n<h2 style=\"color: #575756; margin: 38px 0 18px; line-height: 1.3;\">One Machine, Three Processes<\/h2>\n<figure style=\"margin: 0 0 28px;\"><img decoding=\"async\" loading=\"lazy\" style=\"width: 100%; height: auto; border-radius: 6px; display: block;\" src=\"https:\/\/edapro.ch\/wp-content\/uploads\/2026\/08\/edalife-chrome-brausystem-scheune.jpg\" alt=\"EdaLife Chrome brewing system in the barn\"><figcaption style=\"color: #8a8a89; font-size: 14px; margin-top: 8px; line-height: 1.5;\">The same brewing system that brews compost tea in summer makes ferments in winter.<\/figcaption><\/figure>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">Aerobically propagate or anaerobically ferment \u2013 the <a style=\"color: #7a8a1f; font-weight: 600;\" href=\"https:\/\/edapro.ch\/en\/shop\/brewing-systemedalife-chrome\/\">EdaLife<\/a> can do both. The same system we use to produce compost tea in summer and <a style=\"color: #7a8a1f; font-weight: 600;\" href=\"https:\/\/edapro.ch\/en\/compost-extract-instead-of-compost-tea-the-final-vitalization-in-autumn\/\">compost extract<\/a> in autumn makes the ferments in winter. <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">One point is important here: ferments need warmth. For EM, room temperature in a cold barn is not enough. That&#8217;s why the brewing systems come with integrated heating, control, and insulation \u2013 this equipment is necessary for ferment production, but not for compost tea in summer.  <\/p>\n<div style=\"display: flex; gap: 14px; align-items: flex-start; margin: 0 0 18px; padding: 16px 18px; background: #f8f9f2; border-left: 4px solid #b5c334; border-radius: 4px;\">\n<div style=\"font-size: 26px; line-height: 1.2; flex: 0 0 auto;\">\ud83c\udf21\ufe0f<\/div>\n<div style=\"color: #575756;\"><strong style=\"display: block; margin-bottom: 4px; font-size: 17px;\">Consider Before Purchase<\/strong>If you want to use the brewing system for ferments in winter, order it with heating and insulation right away.<\/div>\n<\/div>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">This makes the machine profitable for significantly more months. Compost tea in spring and summer, compost extract in autumn, ferments in winter. <\/p>\n<h2 style=\"color: #575756; margin: 38px 0 18px; line-height: 1.3;\">Make Success Visible \u2013 and Quantify It<\/h2>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">A vitalized slurry storage is not a matter of faith. You can measure whether the environment has actually shifted. <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">We offer two things for this: a <a style=\"color: #7a8a1f; font-weight: 600;\" href=\"https:\/\/edapro.ch\/en\/consulting\/\">slurry environment analysis<\/a> and microbial analyses of slurry quality. This shows you the state of your storage and whether the additive is achieving what it should. We work with various <a style=\"color: #7a8a1f; font-weight: 600;\" href=\"https:\/\/edapro.ch\/en\/product-category\/analyses\/\">laboratories<\/a> and select the analysis that suits your question.  <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">Then there&#8217;s the plant side. We use a <a style=\"color: #7a8a1f; font-weight: 600;\" href=\"https:\/\/edapro.ch\/en\/product-category\/analyses\/\">leaf sap analysis<\/a> two to three weeks after slurry application to check if nitrogen incorporation is working \u2013 and which trace elements are needed at your location for the plant to efficiently incorporate nitrogen into proteins and achieve high photosynthetic performance. <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">This is more interconnected than many think. A high nitrate content in feed means a lot of non-protein nitrogen, which ends up as urea in milk. Even worse: nitrate can be converted into nitrite in the cow, which binds oxygen in the blood \u2013 leading to abortions. Less nitrate means healthier animals, better milk, and better slurry biology, because the initial quality of the slurry is decided in the feed.   <\/p>\n<p style=\"color: #575756; line-height: 1.75; margin: 0 0 18px;\">The cycle thus closes: feed, animal, slurry, soil, plant. The slurry additive is one link in this chain \u2013 not the entire chain. <\/p>\n<div style=\"display: flex; gap: 14px; align-items: flex-start; margin: 0 0 18px; padding: 16px 18px; background: #f8f9f2; border-left: 4px solid #b5c334; border-radius: 4px;\">\n<div style=\"font-size: 26px; line-height: 1.2; flex: 0 0 auto;\">\ud83c\udfaf<\/div>\n<div style=\"color: #575756;\"><strong style=\"display: block; margin-bottom: 4px; font-size: 17px;\">What Matters to Us<\/strong>We are not about selling as many products as possible, but about ensuring that the measures implemented are successful. Analyses allow for individual adjustments on the farm before an entire season is lost. For me as a farmer, that&#8217;s what counts.  <\/div>\n<\/div>\n<div style=\"margin: 40px 0 0; padding: 22px 24px; background: #f8f9f2; border-left: 4px solid #b5c334; border-radius: 4px; color: #575756;\"><strong style=\"display: block; margin-bottom: 10px; font-size: 17px;\">Read More<\/strong><br \/><a style=\"color: #7a8a1f; font-weight: 600;\" href=\"https:\/\/edapro.ch\/en\/compost-tea-as-a-foliar-stimulant-what-really-matters\/\">Compost Tea as a Foliar Stimulant: What Really Matters<\/a>  \u00b7<br \/><a style=\"color: #7a8a1f; font-weight: 600;\" href=\"https:\/\/edapro.ch\/en\/compost-extract-instead-of-compost-tea-the-final-vitalization-in-autumn\/\">Compost Extract Instead of Compost Tea: The Final Vitalization in Autumn<\/a>  \u00b7<br \/><a style=\"color: #7a8a1f; font-weight: 600;\" href=\"https:\/\/edapro.ch\/en\/how-to-check-the-quality-of-your-compost-tea\/\">How to Check the Quality of Your Compost Tea<\/a>  \u00b7<br \/><a style=\"color: #7a8a1f; font-weight: 600;\" href=\"https:\/\/edapro.ch\/en\/product-category\/compost-tea\/brewing-systems\/\">Brewing Systems<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>In autumn, our brewing system is in continuous operation: 500 liters of compost tea for the neighboring farm, the next<\/p>\n","protected":false},"author":7552,"featured_media":14717,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[642],"tags":[],"class_list":["post-14720","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-compost-tea-production"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Produce Your Own Slurry Additive: Lactic Acid Bacteria in Slurry | EDAPRO<\/title>\n<meta name=\"description\" content=\"What lactic acid bacteria achieve in slurry storage: fewer ammonia losses, less putrefaction, 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