{"id":178,"date":"2023-09-24T09:50:19","date_gmt":"2023-09-24T08:50:19","guid":{"rendered":"https:\/\/xstore.8theme.com\/demos\/landing-watch\/?p=178"},"modified":"2023-10-11T14:26:52","modified_gmt":"2023-10-11T12:26:52","slug":"ndvi-health-crops-2","status":"publish","type":"post","link":"https:\/\/tethys.farm\/en\/ndvi-health-crops-2\/","title":{"rendered":"The NDVI index to safeguard the health of your crops"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"178\" class=\"elementor elementor-178\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7dd5430e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7dd5430e\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-3a718e95\" data-id=\"3a718e95\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-353ef5b3 elementor-widget elementor-widget-text-editor\" data-id=\"353ef5b3\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>L&#039;<strong>NDVI<\/strong> it is a fundamental index in precision agriculture and is useful for evaluating and monitoring it <strong>state of health of plants<\/strong> in a specific plot of land.<\/p><p>It is a very intuitive and easy to interpret index. It is calculated as the ratio between the difference and the sum of the radiation reflected in the near infrared and red:<\/p><p>(NIR \u2013 RED) \/ (NIR + RED)<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6f1598f0 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6f1598f0\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-36c86267\" data-id=\"36c86267\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-743bb397 elementor-widget elementor-widget-image\" data-id=\"743bb397\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"459\" src=\"https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/Wavelength-768x459.png\" class=\"attachment-medium_large size-medium_large wp-image-7127\" alt=\"\" srcset=\"https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/Wavelength-768x459.png 768w, https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/Wavelength-300x179.png 300w, https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/Wavelength-600x359.png 600w, https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/Wavelength-1x1.png 1w, https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/Wavelength-10x6.png 10w, https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/Wavelength.png 989w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-b3d29d9\" data-id=\"b3d29d9\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4d378ea elementor-widget elementor-widget-text-editor\" data-id=\"4d378ea\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>\u00a0<\/p><p>But how do you obtain the data needed to make this calculation?<br \/>It is possible to derive these values starting from <strong>satellites in orbit<\/strong> which, thanks to latest generation optical sensors, are able to return images containing precious data on the reflectances of infrared (IR) and red (RED) radiation coming from the earth&#039;s surface.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-89e5654 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"89e5654\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-7b487bd\" data-id=\"7b487bd\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d2fe017 elementor-widget elementor-widget-text-editor\" data-id=\"d2fe017\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>\u00a0<\/p><p style=\"text-align: left;\">The sensors, in fact, measure the amount of sunlight reflected by the <strong>vegetation<\/strong> which, due to the chlorophyll content of the leaves and other &quot;green parts&quot; of the plant, interacts in a very interesting and useful way with the frequencies of <strong>near infrared<\/strong> (Near InfraRed or NIR: 214-400 ThZ).<br \/>These detect the degree of development and health of the plant: the reflected near-infrared radiations increase when the vigor of the plant improves (on the right in the figure below), while if the crop has problems, the NIR radiations that are reflected by the leaves are reduce (on the right in the figure).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-31655b7\" data-id=\"31655b7\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e2c8f77 elementor-widget elementor-widget-image\" data-id=\"e2c8f77\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"533\" height=\"373\" src=\"https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/NDVI-wavelength-str.jpg\" class=\"attachment-medium_large size-medium_large wp-image-7129\" alt=\"\" srcset=\"https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/NDVI-wavelength-str.jpg 533w, https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/NDVI-wavelength-str-300x210.jpg 300w, https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/NDVI-wavelength-str-1x1.jpg 1w, https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/NDVI-wavelength-str-10x7.jpg 10w\" sizes=\"auto, (max-width: 533px) 100vw, 533px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-06be3f6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"06be3f6\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-f0e6f6c\" data-id=\"f0e6f6c\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-35eb818 elementor-widget elementor-widget-image\" data-id=\"35eb818\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"682\" height=\"476\" src=\"https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/Fasi-fenologiche.png\" class=\"attachment-full size-full wp-image-7130\" alt=\"\" srcset=\"https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/Fasi-fenologiche.png 682w, https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/Fasi-fenologiche-300x209.png 300w, https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/Fasi-fenologiche-600x419.png 600w, https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/Fasi-fenologiche-1x1.png 1w, https:\/\/tethys.farm\/wp-content\/uploads\/2016\/09\/Fasi-fenologiche-10x7.png 10w\" sizes=\"auto, (max-width: 682px) 100vw, 682px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-b0fbdb7\" data-id=\"b0fbdb7\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-39266f4 elementor-widget elementor-widget-text-editor\" data-id=\"39266f4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>\u00a0<\/p><p>To be precise, the NDVI varies between -1 and 1 e <strong>it grows as the health and luxuriance of the plant increases<\/strong>, with the negative values typical of non-agricultural areas (water and urbanized areas).<br \/>However, to count on reliable data, it is advisable to always take the different considerations into consideration <strong>phenological phases<\/strong> some plants. In fact, these influence the NDVI index which increases during the budding phase, stabilizes during the vegetative phase and reduces during senescence, according to a bell-shaped trend as schematized for a generic crop.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b19a4e3 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b19a4e3\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-81f51c4\" data-id=\"81f51c4\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b455aad elementor-widget elementor-widget-text-editor\" data-id=\"b455aad\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>By combining health status and phenological stage of crops, different NDVI values can therefore be <strong>interpreted<\/strong> <strong>as follows<\/strong>:<br \/>NDVI Value Interpretation<br \/>&lt;0 Inanimate objects or cloud outlines<br \/>0.4 Crop in serious distress or just planted\/already harvested<br \/>0.5 Crop in distress or recently planted\/senescent<br \/>0.55 Crop with problems or in the development\/senescence phase<br \/>0.6 Crop with some problems or in the development\/beginning of senescence phase<br \/>0.65 Crop not fully developed or with some growth problems<br \/>0.7 Developed and healthy crop<br \/>1 Fully developed and healthy crop<\/p><p>In conclusion, an NDVI that tends to reduce is a symptom of problems in the vegetative development of crops, which can be caused by water or nutritional stress, damage from adverse weather conditions (e.g. hail), parasitic attacks or other. NDVI is therefore a very useful tool for <strong>promptly identify any areas of crop distress<\/strong>, which are characterized by index values significantly lower than the other areas of the field.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>NDVI is a fundamental index in precision agriculture, useful for evaluating and monitoring the health status of plants in a specific plot of land. <\/p>","protected":false},"author":3,"featured_media":7122,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[60],"tags":[64,62,66,61,67,63,65],"class_list":["post-178","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-immagini-satellitari","tag-agricoltura-4-0","tag-agricoltura-di-precisione","tag-indici-vegetazionali","tag-monitoraggio-satellitare","tag-ndvi","tag-precision-farming","tag-satelliti"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - 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