{"id":91278,"date":"2025-12-29T17:36:56","date_gmt":"2025-12-29T15:36:56","guid":{"rendered":"https:\/\/ant.plantae.lavallweb.com\/?p=91278"},"modified":"2026-01-15T21:23:30","modified_gmt":"2026-01-15T19:23:30","slug":"gravimetrico-y-volumetrico-explicado-por-plantae","status":"publish","type":"post","link":"https:\/\/ant.plantae.lavallweb.com\/en\/gravimetrico-y-volumetrico-explicado-por-plantae\/","title":{"rendered":"Gravimetric and volumetric explained by Plantae"},"content":{"rendered":"<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">Knowing how much water the soil can hold is the foundation of good irrigation. First, we measure it by weight (gravimetric) and then we transfer it to the field (volumetric). <strong>Emilio Rodr\u00edguez, <em>Director of the Agronomy Department at Plantae<\/em>, explains.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Gravimetric measurement<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"translation-block\">It is based on mass.<\/li>\n\n\n\n<li>You measure how much something weighs.<\/li>\n\n\n\n<li class=\"translation-block\">In chemistry and soil analysis, for example, you can measure how much water is in a soil sample by weighing it before and after drying. <a href=\"https:\/\/es.wikipedia.org\/wiki\/Anlisis_gravimtrico?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noreferrer noopener\">Wikipedia<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">\ud83d\udc49 Typical result: <strong>gravimetric moisture content<\/strong> = mass of water \/ mass of dry soil.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Volumetric measurement<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"translation-block\">It is based on volume.<\/li>\n\n\n\n<li>Instead of weighing, it is measured or expressed by volume.<\/li>\n\n\n\n<li class=\"translation-block\">For example, the volumetric moisture content of soil tells you how much water is present per unit volume of total soil (not per mass). <a href=\"https:\/\/es.wikipedia.org\/wiki\/Anlisis_volumtrico?utm_source=chatgpt.com\" target=\"_blank\" rel=\"noreferrer noopener\">Wikipedia<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">\ud83d\udc49 Typical result: <strong>volumetric moisture content<\/strong> = volume of water \/ total soil volume.<\/p>\n\n\n\n<h2 class=\"wp-block-heading translation-block\">How do you go from <strong>gravimetric \u2192 volumetric<\/strong>?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">To make the conversion you need to know <strong>the density of the soil<\/strong> or <strong>its apparent density<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">General formula<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yeah<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"translation-block\"><math><semantics><mrow><msub><mi>\u03b8<\/mi><mi>g<\/mi><\/msub><\/mrow><annotation encoding=\"application\/x-tex\">\\theta_g<\/annotation><\/semantics><\/math>\u03b8g\u200b = <strong>gravimetric<\/strong> water content (kg\/kg)<\/li>\n\n\n\n<li class=\"translation-block\"><math><semantics><mrow><msub><mi>\u03c1<\/mi><mi>b<\/mi><\/msub><\/mrow><annotation encoding=\"application\/x-tex\">\\rho_b<\/annotation><\/semantics><\/math>\u03c1b\u200b = <strong>apparent density of soil<\/strong> (kg\/m\u00b3)<\/li>\n\n\n\n<li class=\"translation-block\"><math><semantics><mrow><msub><mi>\u03c1<\/mi><mi>w<\/mi><\/msub><\/mrow><annotation encoding=\"application\/x-tex\">\\rho_w<\/annotation><\/semantics><\/math>\u03c1w\u200b = <strong>density of water<\/strong> (approx. 1000 kg\/m\u00b3)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">Then:<math display=\"block\"><semantics><mrow><msub><mi>\u03b8<\/mi><mi>v<\/mi><\/msub><mo>=<\/mo><msub><mi>\u03b8<\/mi><mi>g<\/mi><\/msub><mo>\u00d7<\/mo><mrow><mo>(<\/mo><mfrac><msub><mi>\u03c1<\/mi><mi>b<\/mi><\/msub><msub><mi>\u03c1<\/mi><mi>w<\/mi><\/msub><\/mfrac><mo fence=\"true\">)<\/mo><\/mrow><\/mrow><annotation encoding=\"application\/x fence-tex\">\\theta_v = \\theta_g \\times \\left(\\frac{\\rho_b}{\\rho_w}\\right)<\/annotation><\/semantics><\/math><\/p>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">\ud83d\udc49 This gives the <strong>volumetric<\/strong> water content (<math><semantics><mrow><msub><mi>\u03b8<\/mi><mi>v<\/mi><\/msub><\/mrow><annotation encoding=\"application\/x-tex\">\\theta_v<\/annotation><\/semantics><\/math>).<\/p>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">In other words: you take the weight of water per mass of soil and convert it to the volume of water per volume of soil using densities. (This is the most standard and commonly used method in agronomy\/soil science.)<\/p>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">This type of conversion <strong>is what is normally done in soil moisture studies<\/strong> when you have gravimetric (mass) data and you want it in volumetric terms (for models or sensors).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why is this conversion being done?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">\u2714 <strong>In analytical chemistry (general):<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The gravimetric method is very accurate because it only uses mass. <\/li>\n\n\n\n<li>The volumetric method is faster for titrations where you already know the reactions and can use a volume of titrant.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">\u2714 <strong>In soils \/ agriculture \/ environment:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"translation-block\">Sensors and models usually work with <strong>volume of water per volume of soil<\/strong> (volumetric), because this relates better to the actual availability of water for plants.<\/li>\n\n\n\n<li class=\"translation-block\">Gravimetric measurements are used to calibrate volumetric sensors (e.g., TDR or capacitive sensors).<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udccc A practical example explained by the director of agronomy at Plantae<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">How much water can the soil hold?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">We are going to explain the concept of <strong>how much water a soil is capable of retaining<\/strong>, a very common question when we make field visits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">Knowing this information is key because, based on it, we can calculate <strong>what the irrigation dose should be<\/strong>, which is technically known as <strong>irrigation depth<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">To perform this calculation, at Plantaec we work with <strong>gravimetric units<\/strong>, that is, units related to the weight of the soil.<\/p>\n\n\n\n<figure class=\"wp-block-image alignleft size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"906\" height=\"446\" src=\"https:\/\/ant.plantae.lavallweb.com\/wp-content\/uploads\/2025\/12\/image.png\" alt=\"\" class=\"wp-image-91283\" style=\"aspect-ratio:2.0313912517350605;width:332px;height:auto\" srcset=\"https:\/\/ant.plantae.lavallweb.com\/wp-content\/uploads\/2025\/12\/image.png 906w, https:\/\/ant.plantae.lavallweb.com\/wp-content\/uploads\/2025\/12\/image-300x148.png 300w, https:\/\/ant.plantae.lavallweb.com\/wp-content\/uploads\/2025\/12\/image-768x378.png 768w, https:\/\/ant.plantae.lavallweb.com\/wp-content\/uploads\/2025\/12\/image-18x9.png 18w, https:\/\/ant.plantae.lavallweb.com\/wp-content\/uploads\/2025\/12\/image-600x295.png 600w\" sizes=\"(max-width: 906px) 100vw, 906px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Methodology for calculating water retention capacity:<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li class=\"translation-block\"><strong>Sample collection<\/strong><br>A soil sample is taken in the field, always weighing more than 1 kg<\/li>\n\n\n\n<li class=\"translation-block\"><strong>Soil Drying<\/strong><br>The sample is placed in an oven until all the water is removed. This gives us soil with <strong>0% moisture<\/strong>.<br>In the example, the dry soil weighs <strong>1 kg<\/strong>.<\/li>\n\n\n\n<li class=\"translation-block\"><strong>Water saturation<\/strong><br>A large amount of water (1\u20132 liters) is added to that kilogram of dry soil and placed in a container that allows drainage of excess water.<\/li>\n\n\n\n<li class=\"translation-block\"><strong>Drainage<\/strong><br>It is left to drain for approximately <strong>12 hours<\/strong>, so that only the water that the soil is able to retain remains.<\/li>\n\n\n\n<li class=\"translation-block\"><strong>Final weighing<\/strong><br>After drainage, the sample is weighed again.<br>In this example, the final weight is <strong>1,300 kg<\/strong>.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">\ud83d\udc49 <strong>Conclusion:<\/strong><br>The soil has retained <strong>300 ml of water<\/strong>, which is equivalent to <strong>30% of its weight<\/strong>.<br>That is the key fact: <strong>this soil can hold 30% water<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Weight to volume conversion<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Now we transfer this data to the field:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"translation-block\">Considered surface: <strong>1 m\u00b2<\/strong><\/li>\n\n\n\n<li class=\"translation-block\">Soil depth: <strong>50 cm (0.5 m)<\/strong>, (It is not normally done at greater depths in many soils in Spain)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">The volume of soil is: 1 m\u00b2 \u00d7 0.5 m = <strong>0.5 m\u00b3<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">If we know that the apparent density of the soil is, for example: <strong>1,400 kg\/m\u00b3<\/strong>. Then in 0.5 m\u00b3 we have: <strong>700 kg of soil<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Calculation of total stored water<\/h3>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">If the soil can retain 30% water: 700 kg \u00d7 0.30 = 210 liters of water<\/p>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">\ud83d\udc49 This means that, to completely fill the first 50 cm of soil in 1 m\u00b2 with usable water, we need <strong>210 liters of water<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Water available to the plant<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Not all the water retained by the soil is available for cultivation. This is where concepts such as the following come into play:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Total available water<\/strong>.<\/li>\n\n\n\n<li><strong>Easily assimilated water<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">For example, if we consider that the crop can comfortably extract water until the humidity drops from <strong>30% to 15%<\/strong>, that 15% would be the actual usable water.<\/p>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">However, in sensitive crops (especially horticultural crops), farmers usually avoid any type of water stress. Therefore, in practice, they don't work with the full range of available water, but rather with a permissible level of depletion.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Example of practical handling<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Let's assume that:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Maximum soil capacity: <strong>30 %<\/strong>.<\/li>\n\n\n\n<li>Minimum allowed level: <strong>24 %<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">This means that we only allow 6% of the water to be extracted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To facilitate interpretation, we transformed the scale:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>30% \u2192 100% of the \u201cdeposit\u201d<\/strong>.<\/li>\n\n\n\n<li><strong>24% \u2192 0% of the \u201cdeposit\u201d<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">It does not mean that the soil is dry, but rather that <strong>this is the management range that interests us<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">If 100% is equal to <strong>210 liters<\/strong>, then: 6% = <strong>12.6 liters per m\u00b2<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Practical applications<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">With this information we can:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"translation-block\">Calculate the <strong>irrigation duration<\/strong>.<\/li>\n\n\n\n<li class=\"translation-block\">Decide if the <strong>installed drippers are adequate<\/strong>.<\/li>\n\n\n\n<li class=\"translation-block\">Adjust the <strong>irrigation frequency<\/strong>.<\/li>\n\n\n\n<li class=\"translation-block\">Correctly interpret the <strong>soil moisture graphs<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph translation-block\">It all starts with understanding how much water the soil can hold and what extraction margin we are willing to allow depending on the crop and agronomic management.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Cu\u00e1nta AGUA le CABE a tu SUELO (y c\u00f3mo CALCULAR el RIEGO exacto) | Agricultura de Precisi\u00f3n\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/rYLRdZsTEns?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><a href=\"https:\/\/ant.plantae.lavallweb.com\/en\/empieza-a-ahorrar-agua-y-mejora-tu-cultivo-con-tecnologia-de-precision\/\">Discover more about Plantae<\/a><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>","protected":false},"excerpt":{"rendered":"<p class=\"translation-block\">Knowing how much water the soil can hold is the foundation of good irrigation. First, we measure it by weight (gravimetric) and then we transfer it to the field (volumetric). <strong>Emilio Rodr\u00edguez, <em>Director of the Agronomy Department at Plantae<\/em>, explains.<\/strong><\/p>","protected":false},"author":5,"featured_media":91282,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[10],"tags":[15],"class_list":["post-91278","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-informativas","tag-agricultura-de-precision"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gravim\u00e9trico y volum\u00e9trico explicado por Plantae - Plantae<\/title>\n<meta name=\"description\" content=\"Saber cu\u00e1nta agua le cabe al suelo es la base de un buen riego. 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