{"id":973,"date":"2020-07-28T18:01:00","date_gmt":"2020-07-28T18:01:00","guid":{"rendered":"https:\/\/greencastadvisory.com\/blog\/normalised-difference-vegetation-index\/"},"modified":"2022-08-30T14:07:54","modified_gmt":"2022-08-30T14:07:54","slug":"normalised-difference-vegetation-index","status":"publish","type":"post","link":"https:\/\/greencastadvisory.com\/fr\/blog\/normalised-difference-vegetation-index\/","title":{"rendered":"Normalised Difference Vegetation Index"},"content":{"rendered":"

When we do any trial work we take a number of measurements in order to assess the trial. In the main these are visual assessments made by the assessor there is always a set of guidelines however human nature means interpretations can and will be slightly different. This is why it’s so important to use professional and independent assessors for this work.<\/p>\n\n\n

Plant health, Turf colour, Disease %’s are all assessed by eye which is a tried and tested means of assessment that has been used for many years.<\/p>\n\n\n\n

In these trial assessments we also use an NDVI meter so we have a completely independent measurement created by something other than the assessor.<\/p>\n\n\n\n

NDVI stands for Normalised Difference Vegetation Index and it’s a simple instrument that emits light and measures what light returns. By doing this it can measure the health of the plant.<\/p>\n\n\n\n

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In trials we see figures between 0.59 and 0.85. The closer the figure is to 1 the healthier it is. Rarely will you ever see the figure get above 0.85 though.<\/p>\n\n\n\n

Does this tool have any place in the field? <\/h4>\n\n\n\n

It’s certainly not essential – however it does give you an opportunity to measure turf health without it being an opinion. The figure is fairly irrelevant – just like a moisture meter, what might be optimum on one golf course is different for another manager on a different course. I didn’t have one when I was a course manager but knowing what I know now how I would I have used one?<\/p>\n\n\n\n

Regularly – Like all measurements the more often you do something the better you understand it.<\/p>\n\n\n\n

In the same place – taking a reading in the same spot on a daily basis would start giving you some pretty good indications of the plants health.<\/p>\n\n\n\n

Agriculture is using this technology on a much larger scale already. Satellites are taking NDVI readings on regular basis and large farmers are using these measurements to help them optimise their yield. <\/p>\n\n\n\n

This is where the real value is – regular mapping of land to assess the changes in plants health in different conditions.<\/p>\n\n\n\n

We have done a little work on golf courses to see what value there is for turf managers. The resolution is still a little way off from being useful but it is getting there. The standard resolution around 3 years ago was 3 meters per pixel (top image) but that has already moved to 0.7 meters per pixel (bottom image) and this improvement in resolution will continue. <\/p>\n\n\n\n

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With time this may become a feasible way to look at plant health and use it as a tool to implement ITM strategies but in the meantime the handheld units are a useful tool if you use them regularly.<\/p>\n\n\n\n

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NDVI meters are available on Turf Rewards<\/a> which is great way to get hold of some of these agronomic tools and Dr Andy Owen of ICL does a great job explaining how to use one here……. <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

When we do any trial work we take a number of measurements in order to assess the trial. In the main these are visual assessments made by the assessor there is always a set of guidelines however human nature means interpretations can and will be slightly different. This is why it’s so important to use\u2026<\/p>\n","protected":false},"author":2,"featured_media":974,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[44],"tags":[],"class_list":["post-973","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-turf-care","entry"],"acf":[],"_links":{"self":[{"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/posts\/973","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/comments?post=973"}],"version-history":[{"count":0,"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/posts\/973\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/media\/974"}],"wp:attachment":[{"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/media?parent=973"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/categories?post=973"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/tags?post=973"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}