Taken from a James Beard article<\/a><\/figcaption><\/figure><\/div>\n\n\n\nThere is certainly an optimum range for growth in cool season grasses – soil temperature of between 16 to 24C (with and a lethal threshold point around 42C). Even the extreme days we see in the UK (and we are seeing more of these) the soil temperatures typically only move out of the optimum ranges for a few hours a day.<\/p>\n\n\n\n
Soil temperature will vary in practice, depending on many factors, including soil moisture, thatch \/ organic matter levels and positioning of the playing surface. Good watering practices and good organic matter management will both help keep soil temperatures lower during these periods.<\/p>\n\n\n\n
So even though we are seeing more extreme temperatures, GDD models still have a useful role to play helping us time our PGR applications. Particularly on well managed surfaces that are kept in a healthy state during these periods. If the temperatures are warm and turf is healthy Primo Maxx will be effective for shorter periods of time.<\/p>\n\n\n\n
If however you are using Primo on unirrigated fairways, as we move into the summer months, which can be dryer and hotter, then GDD isn’t so useful. The additional stresses will be doing a pretty good job of reducing growth for you.<\/p>\n\n\n\n
GDD is a great tool for guiding you with your Primo Maxx II applications – it is pretty simple though and should be used with caution. If the turf is stressed to the point that it is no longer growing then you need to work that into your decision making process. If the weather is hot and you have the plant in a position to cope with that stress, then the Primo longevity will be shorter.<\/p>\n","protected":false},"excerpt":{"rendered":"
Can Yorkshire deliver any stress? That’s the question I usually open with and at last the answer is yes! This week I’ll take a look at why GDD (Growing Degree Day) models are still useful during high stress periods if you have that stress under control. After a pretty dull July the first 2 weeks…<\/p>\n","protected":false},"author":2,"featured_media":1095,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[52],"tags":[],"acf":[],"aioseo_notices":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/greencastadvisory.com\/wp-content\/uploads\/2022\/05\/Screenshot-2020-08-19-at-11.52.41.jpg","_links":{"self":[{"href":"https:\/\/greencastadvisory.com\/wp-json\/wp\/v2\/posts\/1094"}],"collection":[{"href":"https:\/\/greencastadvisory.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/greencastadvisory.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/greencastadvisory.com\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/greencastadvisory.com\/wp-json\/wp\/v2\/comments?post=1094"}],"version-history":[{"count":1,"href":"https:\/\/greencastadvisory.com\/wp-json\/wp\/v2\/posts\/1094\/revisions"}],"predecessor-version":[{"id":4004,"href":"https:\/\/greencastadvisory.com\/wp-json\/wp\/v2\/posts\/1094\/revisions\/4004"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/greencastadvisory.com\/wp-json\/wp\/v2\/media\/1095"}],"wp:attachment":[{"href":"https:\/\/greencastadvisory.com\/wp-json\/wp\/v2\/media?parent=1094"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/greencastadvisory.com\/wp-json\/wp\/v2\/categories?post=1094"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/greencastadvisory.com\/wp-json\/wp\/v2\/tags?post=1094"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}