{"id":207987,"date":"2025-06-20T14:00:00","date_gmt":"2025-06-20T12:00:00","guid":{"rendered":"https:\/\/atami.com\/blog\/uncategorized-en-zaf\/calcium-and-magnesium-in-cultivation-essential-nutrients-for-a-healthy-deficiency-free-harvest"},"modified":"2025-06-20T16:35:06","modified_gmt":"2025-06-20T14:35:06","slug":"calcium-and-magnesium-in-cultivation-essential-nutrients-for-a-healthy-deficiency-free-harvest","status":"publish","type":"post","link":"https:\/\/atami.com\/en-zaf\/blog\/cultivation\/calcium-and-magnesium-in-cultivation-essential-nutrients-for-a-healthy-deficiency-free-harvest","title":{"rendered":"Calcium and Magnesium in Cultivation: Essential Nutrients for a Healthy, Deficiency-Free Harvest"},"content":{"rendered":"\t\t
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In the world of cultivation, some nutrients steal all the spotlight\u2026 (yes, we\u2019re looking at you, NPK). Meanwhile, others quietly play a crucial role behind the scenes.<\/p>\n

 <\/p>\n

That\u2019s exactly the case with calcium and magnesium: two key macronutrients that are frequently underestimated but can make a huge difference to plant health, growth, and overall crop quality.<\/p>\n

 <\/p>\n

In this blog, we explain why they are so important, when they may be lacking, what symptoms they cause and, above all, how to prevent deficiencies with ATA CALMAG and VGN CALMAG, Atami’s additives designed to meet precisely these needs.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Contents<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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1. Functions of Calcium in Plants and Signs of Deficiency
\n2. Functions of Magnesium in Plants and Signs of Deficiency
\n3. Why Calcium and Magnesium Deficiencies Happen in Modern Cultivation
\n4. Why You Should Use ATA CALMAG or VGN CALMAG<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Functions of Calcium in Plants<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Did you know that calcium acts like the “cement” of your plants?<\/p>\n

 <\/p>\n

Even though it doesn\u2019t directly participate in photosynthesis, calcium is essential for maintaining the structure and overall health of your crop.<\/strong> It\u2019s far from a filler nutrient \u2014 it plays a critical role in ensuring that plant cells function properly and can defend themselves against stress.<\/p>\n

 <\/p>\n

What does calcium do for plants?<\/strong><\/p>\n

\u2022 Cell structure:<\/strong> Calcium is a key part of plant cell walls, giving them rigidity and strength. A plant without calcium is, quite literally, a soft plant.
\n\u2022 Root development:<\/strong> It supports the formation and elongation of young roots, improving water and nutrient uptake.
\n\u2022 Cell division and elongation:<\/strong> No calcium, no growth.
\n\u2022 Enzyme activation:<\/strong> Many internal plant reactions require calcium to kickstart key biological processes.
\n\u2022 Stress resistance:<\/strong> Well-structured plants are better equipped to handle drought, heat stress and pathogens.<\/p>\n

 <\/p>\n

Calcium deficiency symptoms in plant leaves<\/strong>
Unlike magnesium, calcium is not very mobile within the plant.<\/strong> That\u2019s why the first signs of deficiency appear in new growth and at shoot tips:<\/p>\n

\u2022 Deformed new leaves<\/strong>, often with curled or sticky edges
\n\u2022 Necrosis on leaf margins<\/strong>; brown, dry spots that spread from the edges
\n\u2022 Burnt or dead leaf tips<\/strong>
\n\u2022 Stunted growth<\/strong> in young shoots
\n\u2022 In fruits:<\/strong> blossom-end rot (especially in tomatoes), cracked skins, or visible deformities<\/p>\n

 <\/p>\n

Learn more about calcium deficiency and functions here<\/strong><\/a>.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Functions of Magnesium in Plants<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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What does magnesium do for your crop?<\/strong><\/p>\n

Magnesium (Mg) is one of those nutrients that often goes unnoticed… until it\u2019s missing. And when it\u2019s missing, your plants feel it fast.<\/p>\n

 <\/p>\n

Here are its key roles:<\/p>\n

\u2022 Central component of chlorophyll<\/strong>
\nIt\u2019s quite literally the heart of the molecule that allows the plant to photosynthesise. Without magnesium, your plant can\u2019t turn light into energy.
\n\u2022 Involved in sugar and protein production<\/strong>
\nMagnesium activates many enzymes related to metabolism, energy transfer and the formation of carbohydrates essential for plant growth.
\n\u2022 Helps phosphorus uptake<\/strong>
\nPhosphorus is crucial for developing strong roots, flowers and fruits \u2014 but its absorption is limited if magnesium is lacking.
\n\u2022 Supports internal nutrient transport<\/strong>
\nMagnesium helps move other nutrients throughout the plant, promoting balanced development and healthy growth.<\/p>\n

 <\/p>\n

Magnesium deficiency symptoms in plant leaves<\/strong><\/p>\n

\u2022 Interveinal chlorosis:<\/strong> Leaves turn yellow between the veins, while the veins themselves remain green.
\n\u2022 First appears on older leaves:<\/strong> Since magnesium is a mobile nutrient, the plant redirects it to new growth, leaving older leaves visibly affected \u2014 as you can see in the image below.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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\u2022 Advanced deficiency<\/strong> can lead to necrosis and premature leaf drop.
\n\u2022 Reduced yield and quality<\/strong>, especially in demanding plants or during late flowering.<\/p>\n

 <\/p>\n

Learn more about magnesium deficiency and functions here<\/strong><\/a>.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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When can calcium and magnesium deficiencies occur?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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There are several situations where these secondary nutrients<\/strong> become absolutely critical:<\/p>\n

\u2022 Fast-growing or high-yielding crops:<\/strong> Vigorous plants with rapid growth or heavy fruiting (like tomatoes, peppers or flowering potted plants) often consume more calcium and magnesium than a standard base fertiliser can provide.
\n\u2022 Coco-based substrates:<\/strong> Coco has low buffering capacity for calcium and magnesium, making supplementation essential to avoid deficiencies.
\n\u2022 Irrigation with reverse osmosis, distilled or rainwater:<\/strong> These types of water contain very low levels of minerals \u2014 especially calcium.
\n\u2022 LED lighting:<\/strong> Under LED grow lights, plants photosynthesise more efficiently and have faster metabolism. This increases their demand for calcium and magnesium, particularly during the flowering stage. When LED growing, adding a calcium and magnesium supplement becomes a must.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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\u2022 Nutrient competition:<\/strong> An excess of certain elements can interfere with uptake:<\/p>\n

<\/p>\n

o High potassium levels can block magnesium absorption.
\no Too much phosphorus competes with calcium.
\no Sodium in hard or saline water also makes nutrient uptake more difficult.<\/p>\n

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\u2022 Acidic or heavily leached soils<\/strong>, where magnesium is easily washed away.<\/p>\n

 <\/p>\n

\ud83d\udca1 The key is prevention<\/strong><\/p>\n

Even if your base fertiliser includes calcium and magnesium, these conditions often require an extra boost. These elements don\u2019t accumulate easily, and their deficiency quickly impacts plant health.<\/p>\n

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Using targeted supplements like ATA CALMAG<\/strong><\/a> or VGN CALMAG<\/strong> helps cover this increased demand and prevents nutrient lockouts or imbalances.<\/p>\n

 <\/p>\n

These are CalMag products for plants<\/strong> designed to restore balance and boost your crop\u2019s health.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Why use ATA CALMAG or VGN CALMAG? The calcium and magnesium your crop needs for a healthy and abundant harvest.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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When your plants get enough calcium and magnesium, they grow stronger, develop greener leaves, produce healthier flowers and yield tastier fruits. These two nutrients are essential for:<\/p>\n

\u2022 Vigorous vegetative growth<\/strong>
\n\u2022 Smooth flowering without deficiencies<\/strong>
\n\u2022 Improved nutrient uptake and energy production<\/strong><\/p>\n

 <\/p>\n

That\u2019s why supplementing with a calcium and magnesium product<\/strong> is often a smart move \u2014 especially if you\u2019re growing fast, under lights or in coco.<\/p>\n

 <\/p>\n

At Atami, we make it easy for you with two CalMag solutions tailored to different growing styles:<\/strong><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t

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ATA CALMAG<\/strong><\/a><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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A fast-acting mineral boost with calcium, magnesium and iron.<\/strong> A versatile solution that tackles three common deficiencies in one go.<\/p>\n

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Perfect for:<\/strong><\/p>\n

\u2022 Growing in coco or hydroponic systems<\/strong>, where calcium and magnesium retention is limited.
\n\u2022 Using reverse osmosis, rainwater or soft water<\/strong>, which are naturally low in minerals.
\n\u2022 The vegetative phase<\/strong>, especially if plants are weak or under stress.<\/p>\n

 <\/p>\n

Recommended dosage:<\/strong> 0.1 \u2013 1 ml\/L, depending on water quality and deficiency level.
Fully compatible with all Atami mineral feeding programmes.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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A 100% organic CalMag additive<\/strong> with no nitrogen<\/strong>, part of Atami\u2019s new VGN range<\/strong> \u2014 perfect for growers seeking a natural, sustainable boost.<\/p>\n

 <\/p>\n

Perfect for:<\/strong><\/p>\n

\u2022 Organic farming<\/strong> and living soils.
\n\u2022 Systems that support beneficial soil microbes<\/strong>.
\n\u2022 The flowering phase<\/strong>, thanks to its nitrogen-free formula.<\/p>\n

 <\/p>\n

Recommended dosage:<\/strong> 1 \u2013 2 ml\/L, depending on crop type and stage.
Certified organic. Zero nitrogen. Respects the soil\u2019s natural balance, what more could you want?<\/strong><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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VGN CALMAG<\/b><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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When to apply CalMag?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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\u2022 Preventively<\/strong>, in demanding crops, under LED lighting<\/strong>, in coco substrate<\/strong>s, or when watering with low-mineral water<\/strong>.
\n\u2022 To correct deficiencies<\/strong>, when early symptoms appear (chlorosis, dry tips, poor vigour).
\n\u2022 As an occasional boost<\/strong>, if nutrient uptake isn\u2019t as strong as it should be.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Final thoughts: Complete nutrition starts with the essentials<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Calcium and magnesium<\/strong> are more than just secondary nutrients \u2014 they\u2019re the invisible support structure that keeps your plants healthy, strong and productive<\/strong>. Without them, photosynthesis, cell division<\/strong> and nutrient absorption<\/strong> can\u2019t function properly.<\/p>\n

 <\/p>\n

That\u2019s why if you grow in coco, use soft water<\/strong> or rely on LED lighting, CalMag supplementation<\/strong> isn\u2019t optional \u2014 it\u2019s a smart investment in your crop\u2019s success.<\/p>\n

 <\/p>\n

\ud83d\udc49 ATA CALMAG<\/strong> and VGN CALMAG<\/strong> are essential allies in avoiding the nutrient deficiencies that could hold your grow back.<\/p>\n

 <\/p>\n

Start using them today and give your plants the extra edge they need to thrive.
Your plants (and you) will thank you.<\/strong><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

In the world of cultivation, some nutrients steal all the spotlight\u2026 (yes, we\u2019re looking at you, NPK). Meanwhile, others quietly play a crucial role behind the scenes.   That\u2019s exactly the case with calcium and magnesium: two key macronutrients that are frequently underestimated but can make a huge difference to plant health, growth, and overall […]<\/p>\n","protected":false},"author":6,"featured_media":207981,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"iawp_total_views":22,"footnotes":""},"categories":[328],"tags":[3525,3527,3524,3526,3529,3523,3528,3522],"class_list":["post-207987","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cultivation","tag-calcium-deficiency-symptoms-in-plant-leaves-en-zaf","tag-functions-of-magnesium-in-the-plant-en-zaf","tag-how-does-calcium-help-plants-in-photosynthesis-en-zaf","tag-how-does-magnesium-help-plants-in-the-process-of-photosynthesis-en-zaf","tag-magnesium-nutrient-deficiency-in-plants-en-zaf","tag-plant-macronutrient-calcium-deficiency-symptoms-en-zaf","tag-what-does-a-plant-look-like-with-a-calcium-deficiency-en-zaf","tag-what-happens-to-a-plant-with-a-calcium-deficiency-en-zaf"],"acf":[],"yoast_head":"\nCalcium Deficiency Symptoms in Plant Leaves: How to 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