{"id":467,"date":"2015-08-31T17:26:48","date_gmt":"2015-08-31T21:26:48","guid":{"rendered":"http:\/\/blog.uvm.edu\/fruit\/2015\/08\/31\/grape-maturity-and-late-season-petiole-sampling\/"},"modified":"2015-08-31T17:26:48","modified_gmt":"2015-08-31T21:26:48","slug":"grape-maturity-and-late-season-petiole-sampling","status":"publish","type":"post","link":"https:\/\/blog.uvm.edu\/fruit\/2015\/08\/31\/grape-maturity-and-late-season-petiole-sampling\/","title":{"rendered":"Grape maturity and late-season petiole sampling"},"content":{"rendered":"<p>by <a href=\"http:\/\/www.uvm.edu\/~pss\/?Page=faculty\/facultybradshaw.php\">Terence Bradshaw<\/a><\/p>\n<p><strong>Grape maturity<br \/>\n<\/strong>We have begun weekly preharvest sampling of the winegrapes at the UVM Horticulture Research and Education Center. Right now, grapes are about a week ahead of last year&#8217;s ripeness schedule, and with warm\/hot, dry weather this week, ripening should advance quickly. I still don&#8217;t expect harvest to begin for another couple of weeks for most varieties.<br \/>\nSampling results for 2015 can be found at: <a href=\"http:\/\/www.uvm.edu\/~fruit\/grapes\/uvmvineyard\/2015UVMfieldtesting.pdf\">http:\/\/www.uvm.edu\/~fruit\/grapes\/uvmvineyard\/2015UVMfieldtesting.pdf<\/a><\/p>\n<p>Past year&#8217;s sampling may be found at: <a href=\"http:\/\/www.uvm.edu\/~fruit\/?Page=grapes\/uvmvineyard\/uvmvineyardhorticulturearchives.html&amp;SM=gr_submenu.html\">http:\/\/www.uvm.edu\/~fruit\/?Page=grapes\/uvmvineyard\/uvmvineyardhorticulturearchives.html&amp;SM=gr_submenu.html<\/a><br \/>\n<strong><br \/>\nPetiole sampling<\/strong><br \/>\nGrowers may ascertain overall nutritional status in their vineyards at two times through petiole analysis: bloom and 70-100 days post-bloom.Now is the time for late (post-veraison\/pre harvest) petiole sampling for plant nutrient status. Dr. Joe Fiola form the University of Maryland has posted some good recommendations in his latest Timely Viticulture newsletter:<\/p>\n<ul>\n<li>Grape petiole analysis is recommended along with soil samples and visual observations as part of a complete nutrient management program.<\/li>\n<li>A three year cycle of sampling all of the varieties in a vineyard is typically recommended.<\/li>\n<li>Tissue\/petiole analyses reveal the actual nutrients in the vines.<\/li>\n<li>Spring tissue sampling is a good time to sample, as you can make nutrient adjustments to the vineyard that will influence this year\u2019s crop quality.<\/li>\n<li>Nitrogen status is best evaluated with tissue sampling not soil sampling.<\/li>\n<\/ul>\n<p><strong>Some specifics on sampling:<\/strong><\/p>\n<ul>\n<li>Each sample should be less than 5 acres; less if there are major changes in soil or topography<\/li>\n<li>Sample different varieties separately. Samples should represent plants that are planted on the same soil type and are of the same age, variety and rootstock.<\/li>\n<li>Vines should represent that portion of a block that is maintained under the same cultural practices, i.e. fertilizer, irrigation and vigor control practices. For example, irrigation blocks are not to be combined with non-irrigated blocks even if they are on the same soil type.<\/li>\n<li>Do not sample vines on the border of the block or near dusty roads.<\/li>\n<li>For the late-season sampling period, sample the petiole of the most recent- FULLY EXPANDED leaf (NOT the one across from the first blossom cluster as during bloom).<\/li>\n<li>About 75-100 (depending on size) petioles are needed as they are typically smaller at the end of the shoot.<\/li>\n<li>Gently wash petioles with water and gentle detergent, pat dry and place in OPEN paper bag (lunch, #6 size) to dry for a few days.<\/li>\n<li>The closest analytical lab for grape petiole analysis is the <a href=\"http:\/\/cnal.cals.cornell.edu\/\">Cornell Nutrient Analysis Laboratory<\/a> . Please note that they now have partnered with Agro-One Services. It is recommended that you contact them before you send any samples to confirm that recommendations will be sent along with the analysis and to confirm costs.<br \/>\nVideo about petiole sampling: <a href=\"https:\/\/www.youtube.com\/watch?v=8EHbojLfXek\">https:\/\/www.youtube.com\/watch?v=8EHbojLfXek<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>by Terence Bradshaw Grape maturity We have begun weekly preharvest sampling of the winegrapes at the UVM Horticulture Research and Education Center. Right now, grapes are about a week ahead of last year&#8217;s ripeness schedule, and with warm\/hot, dry weather this week, ripening should advance quickly. I still don&#8217;t expect harvest to begin for another &hellip; <a href=\"https:\/\/blog.uvm.edu\/fruit\/2015\/08\/31\/grape-maturity-and-late-season-petiole-sampling\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Grape maturity and late-season petiole sampling<\/span><\/a><\/p>\n","protected":false},"author":2068,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[],"tags":[109235,36708],"class_list":["post-467","post","type-post","status-publish","format-standard","hentry","tag-grape","tag-ipm"],"jetpack_publicize_connections":[],"featured_image_src":null,"featured_image_src_square":null,"author_info":{"display_name":"fruit","author_link":"https:\/\/blog.uvm.edu\/fruit\/author\/fruit\/"},"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p4nZlV-7x","_links":{"self":[{"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/posts\/467","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/users\/2068"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/comments?post=467"}],"version-history":[{"count":0,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/posts\/467\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/media?parent=467"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/categories?post=467"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.uvm.edu\/fruit\/wp-json\/wp\/v2\/tags?post=467"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}