{"id":1051,"date":"2020-06-22T02:20:00","date_gmt":"2020-06-22T02:20:00","guid":{"rendered":"https:\/\/greencastadvisory.com\/blog\/gdd-tool-faq-150-gdd\/"},"modified":"2022-06-20T06:24:45","modified_gmt":"2022-06-20T06:24:45","slug":"gdd-tool-faq-150-gdd","status":"publish","type":"post","link":"https:\/\/greencastadvisory.com\/fr\/blog\/gdd-tool-faq-150-gdd\/","title":{"rendered":"GDD Tool – FAQ – 150 GDD?"},"content":{"rendered":"

We’ve recently launched our Growing Degree Day (GDD) tool – (take a look here)<\/a> and a sure sign of engagement is questions and I’ve had a few. In this blog I’m going to talk about why I keep talking about 150 GDD as a application window for PrimoMaxx II.<\/p>\n\n\n

\"\"<\/a><\/figure><\/div>\n\n\n\n

What is a GDD application window?<\/h4>\n\n\n\n

I’m going to assume that since you’re here you have a basic understanding of how GDD is generated and skip straight to why use 150GDD.<\/p>\n\n\n\n

A GDD application window is simply how long a period of time do you leave between PrimoMaxx II applications<\/a>.<\/p>\n\n\n\n

Primo’s longevity is heavily influenced by temperature, the cooler it is – the longer it lasts.<\/p>\n\n\n\n

So as we move through the season, different temperatures or to different areas of the country we should vary the application window to get consistant results.<\/p>\n\n\n\n

We tend to use a figure of 150 GDD in the UK with a base temp of 6 degrees as a starting point.<\/p>\n\n\n\n

Lots of work has been done in the USA on Bentgrass with different Base temperatures. Bill Kreuser of University of Nebraska-Lincoln has done lots of work on this but as far as I can gather the UK GDD research is limited.<\/p>\n\n\n\n

What are we trying to achieve?<\/h4>\n\n\n\n

The point of using the GDD program is to achieve consistent results from your primo. The below graph shows how once Primo has been applied the growth suppression goes through a pattern – turf growth reduces, then begins to creep back to normal and then you go into a potential rebound effect. <\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

When timing our next application we are trying to time the sweet spot between the point of maximum suppression and before we go into a rebound effect.<\/p>\n\n\n\n

This is a much wider window than we give credit. So whilst I talk a lot about a 150 GDD figure for applying Primo – in reality GDD is a guide and shouldn’t be too prescriptive. <\/p>\n\n\n\n

I’d aim to apply somewhere between 100 – 150 GDD use amount of boxes of clippings (or clipping yields) to help guide you. 100 – 150 GDD is an anecdotal figure based on experience, anyone fancy doing a research project for me to tighten that down a little?<\/p>\n","protected":false},"excerpt":{"rendered":"

We’ve recently launched our Growing Degree Day (GDD) tool – (take a look here) and a sure sign of engagement is questions and I’ve had a few. In this blog I’m going to talk about why I keep talking about 150 GDD as a application window for PrimoMaxx II. What is a GDD application window?\u2026<\/p>\n","protected":false},"author":2,"featured_media":1032,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[52,38],"tags":[],"class_list":["post-1051","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-growing-degree-days","category-plant-growth-regulator","entry"],"acf":[],"_links":{"self":[{"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/posts\/1051","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=1051"}],"version-history":[{"count":0,"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/posts\/1051\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/media\/1032"}],"wp:attachment":[{"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/media?parent=1051"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/categories?post=1051"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/greencastadvisory.com\/fr\/wp-json\/wp\/v2\/tags?post=1051"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}