{"id":15207,"date":"2026-10-03T14:59:59","date_gmt":"2026-10-03T14:59:59","guid":{"rendered":"https:\/\/edapro.ch\/?p=15207"},"modified":"2026-10-03T14:59:59","modified_gmt":"2026-10-03T14:59:59","slug":"boron-deficiency-despite-fertilising","status":"publish","type":"post","link":"https:\/\/edapro.ch\/en\/boron-deficiency-despite-fertilising\/","title":{"rendered":"Boron: why the deficiency persists even though you fertilise"},"content":{"rendered":"

Boron<\/a> is not mobile in the plant. Once it has been used, it is not resupplied from older leaves \u2013 the plant needs a steady supply, otherwise the deficiency comes back, no matter how well you fertilised in autumn.<\/p>\n

Why boron is missing even though you fertilised<\/h2>\n

Boron is water-soluble. That is exactly what makes it mobile in the soil and unreliable as a reserve: winter rain washes part of it out of the root zone before the plant becomes active again in spring.<\/p>\n

The second reason lies in the root itself. In dry conditions, uptake through the root drops noticeably, because boron reaches the plant mainly with the flow of water. Dry spells in spring therefore hit exactly the phase in which cereals and oilseed rape need the most boron.<\/p>\n

\n
\"Illustration:<\/div>\n
Water-soluble<\/strong>Boron is leached from the topsoil over the winter. That is why a field can be well supplied in autumn and still run short in spring \u2013 the reserve has long since moved on.<\/div>\n<\/div>\n

What boron does in the plant<\/h2>\n

Boron helps build cell walls and keeps them stable. If it is missing, the plant becomes stunted at the growing tips, because that is exactly where new cell walls have to form all the time.<\/p>\n

Boron is indispensable for flowering and fruit set: it supports the growth of pollen tubes and fertilisation. Without enough boron, flowering stays uneven and fruit set weak \u2013 a pattern I see again and again in oilseed rape and pome fruit.<\/p>\n

Then there is sugar transport. Boron regulates how sugar is moved from the leaves to the rest of the plant. When boron is short, the sugar stays in the leaf instead of reaching the places where it is needed for growth or grain filling. And because boron is also involved in nitrogen metabolism, a deficiency reaches all the way into protein synthesis.<\/p>\n

The link to silicon<\/h2>\n

Without enough boron, silicon is poorly activated in the plant. The two are linked \u2013 and since silicon is abundant in almost every soil but poorly available to plants, a boron deficiency makes exactly this problem worse. I described what a low silicon value in leaf sap means in my last post on leaf sap analysis<\/a>.<\/p>\n

The analysis sheet from Ruswil<\/h2>\n

On one of our own fields in Ruswil, boron in the leaf sap was below the detection limit of 0.20 ppm \u2013 the optimum is 0.40 to 1.20.<\/p>\n

\"Leaf
Winter wheat, young leaf, our own field in Ruswil. Boron below the detection limit, silicon also deficient.<\/figcaption><\/figure>\n

Striking: on the same sheet, silicon is also below the optimum, 30.4 instead of 36.0 to 63.9 ppm. Exactly the pattern from the last section \u2013 where boron is missing, available silicon is usually missing too. The plant was by no means in poor shape overall: sugar, potassium and nitrogen were in the green zone. The deficiency hit precisely the two elements that need each other.<\/p>\n

Without the analysis, nobody would have noticed. A plant does not show an incipient boron deficiency in its appearance first, but in its sap.<\/p>\n

When and how much<\/h2>\n

The application rate depends on crop and timing; the basic pattern is the same everywhere: act early, before flowering begins.<\/p>\n

\n
\ud83c\udf3e<\/div>\n
Application rates Phytogreen Bor<\/strong>Winter cereals: 0.5 l\/ha, one or two applications during stem elongation (BBCH 30\u201337), as a precaution against drought  \u00b7  Oilseed rape: 3 l\/ha in autumn from the 4- to 6-leaf stage, repeat in spring before flowering if the deficiency is severe  \u00b7  General: 0.5 to 3 l\/ha in 200 to 600 l water\/ha<\/div>\n<\/div>\n

In cereals, the application during stem elongation pays off especially when spring starts dry \u2013 exactly when the root supplies less anyway because of the drought. In oilseed rape, the autumn application matters most, because flower and pod formation are decided in autumn.<\/p>\n

Borax or boron ethanolamine<\/h2>\n

Most boron fertilisers on the market are based on borax. Boron ethanolamine is more water-soluble and is taken up faster \u2013 an advantage precisely when the soil supplies little boron or conditions are difficult.<\/p>\n

That is why, in Phytogreen-Bor<\/a>, we use boron ethanolamine \u2013 water-soluble with 11% boron, and listed as an input by FiBL.<\/p>\n

The next step<\/h2>\n

Do you want to know whether your own field is short of boron, or are you just guessing? A leaf sap analysis<\/a> shows you in black and white, like the sheet from Ruswil above.<\/p>\n

If boron is low, correct it in a targeted way with Phytogreen-Bor<\/a> \u2013 and while you are at it, check silicon too. Questions about the rate for your crop: get in touch for advice<\/a>.<\/p>\n

Read more<\/strong>
\nFoliar feeding done right: the 6 rules that decide whether it works<\/a>  \u00b7
\nMagnesium: why the deficiency comes in spring even though the soil is full<\/a>  \u00b7
\nLeaf sap analysis: when to do it and what it shows you<\/a>  \u00b7
\nMaking your own biostimulants: what really works on the farm<\/a>  \u00b7
\nCompost Tea as a Foliar Stimulant: What Really Matters<\/a>  \u00b7
\nInoculating seed and seedlings with compost tea<\/a>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Boron is not mobile in the plant. Once it has been used, it is not resupplied from older leaves \u2013<\/p>\n","protected":false},"author":7552,"featured_media":14951,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[691],"tags":[],"class_list":["post-15207","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analyses"],"yoast_head":"\nBoron deficiency despite fertilising: what really helps | EDAPRO<\/title>\n<meta name=\"description\" content=\"Why boron is often missing despite fertilising, what it does in the plant and how much you need when \u2013 with a real analysis sheet from Ruswil.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/edapro.ch\/en\/boron-deficiency-despite-fertilising\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" 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