{"id":3959,"date":"2021-05-07T07:38:22","date_gmt":"2021-05-07T05:38:22","guid":{"rendered":"https:\/\/vergersdelozere.net\/?p=3959"},"modified":"2022-01-21T12:09:29","modified_gmt":"2022-01-21T11:09:29","slug":"retour-sur-la-gelee-noire-du-8-avril","status":"publish","type":"post","link":"https:\/\/vergersdelozere.net\/index.php\/2021\/05\/07\/retour-sur-la-gelee-noire-du-8-avril\/","title":{"rendered":"Retour sur la gel\u00e9e noire du 8 avril"},"content":{"rendered":"\t\t
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On parle de gel\u00e9e noire lorsqu’au printemps la temp\u00e9rature est anormalement basse et endommage la v\u00e9g\u00e9tation d\u00e9j\u00e0 r\u00e9veill\u00e9e en lui donnant un aspect br\u00fbl\u00e9, comme touch\u00e9 par le feu. A ce moment les bourgeons \u00e0 peine d\u00e9bourr\u00e9s, les feuilles ou les tr\u00e8s jeunes rameaux sont tr\u00e8s vuln\u00e9rables. Dans les r\u00e9gions tr\u00e8s vent\u00e9es, il arrive que les vents de Nord et d’Est secs et froids, produisent les m\u00eames funestes effets sous des temp\u00e9ratures relativement cl\u00e9mentes. \u00a0<\/p>

Les gel\u00e9es blanches se forment lorsque la ros\u00e9e est fig\u00e9e par des temp\u00e9ratures n\u00e9gatives proches de z\u00e9ro degr\u00e9.\u00a0<\/p>

G\u00e9n\u00e9ralement ces gel\u00e9es sont de courte dur\u00e9e, au matin et ne compromettent pas la v\u00e9g\u00e9tation. On parle de\u00a0\u00ab\u00a0z\u00e9ro de v\u00e9g\u00e9tation\u00a0\u00bb d\u2019une plante pour indiquer sa\u00a0rusticit\u00e9, c\u2019est \u00e0 dire , la temp\u00e9rature \u00e0\u00a0laquelle elle\u00a0 est\u00a0endommag\u00e9e par le gel. Selon les plantes, il arrive m\u00eame que\u00a0l’effet\u00a0d\u2019une gel\u00e9e blanche prot\u00e8ge la plante d\u2019un pic de froid au matin. Les\u00a0gouttelettes d\u2019eau cristallis\u00e9es\u00a0produisent comme un petit manteau \u00e0 z\u00e9ro degr\u00e9, isolant les parties\u00a0sensibles\u00a0d\u2019un froid plus marqu\u00e9,\u00a0s\u2019il est de courte dur\u00e9e<\/p>

Les effets sur la vigne sont souvent spectaculaires, mais l’on peut esp\u00e9rer un d\u00e9part ult\u00e9rieur des bourgeons stipulaires et compter sur une r\u00e9colte viticole, un peu retard\u00e9e, moins abondante, mais souvent de bonne qualit\u00e9.\u00a0Le\u00a0d\u00e9sastre\u00a0apparent aura fait l\u2019effet d\u2019un \u00e9bourgeonnement, geste visant \u00e0 limiter le nombre de grappes pour favoriser la qualit\u00e9 des fruits.\u00a0<\/p>

En revanche l’effet sur les arbres de la famille des rosac\u00e9es est d\u00e9vastateur. Si les fleurs sont touch\u00e9es, la nouaison ne s’effectue pas et la fructification est compromise. Seules quelques fleurs retardataires passeront au travers. Les vari\u00e9t\u00e9s \u00e0 floraison tardive pr\u00e9sentent l’int\u00e9r\u00eat de limiter ce risque : on esp\u00e8re ainsi qu’il n’y aura plus de fortes gel\u00e9es lorsque les fleurs \u00e9closent.<\/span><\/p>

Patrick Maurin et Jacky Brard pour Vergers de Loz\u00e8re, mai 2021.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t\tPr\u00e9c\u00e9dent<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t
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Photos : Alexandre Racani\u00e8re<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\n\t\t\t\t\t\t\t\n\t\t\t\tR\u00e9f\u00e9rences\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Article \u00ab\u00a0Gel\u00e9e\u00a0\u00bb sur M\u00e9t\u00e9o France<\/a><\/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>\n\t\t","protected":false},"excerpt":{"rendered":"

On parle de gel\u00e9e noire lorsqu’au printemps la temp\u00e9rature est anormalement basse et endommage la v\u00e9g\u00e9tation d\u00e9j\u00e0 r\u00e9veill\u00e9e en lui donnant un aspect br\u00fbl\u00e9, comme touch\u00e9 par le feu. A ce moment les bourgeons \u00e0 peine d\u00e9bourr\u00e9s, les feuilles ou les tr\u00e8s jeunes rameaux sont tr\u00e8s vuln\u00e9rables. Dans les r\u00e9gions tr\u00e8s vent\u00e9es, il arrive que […]<\/p>\n","protected":false},"author":1,"featured_media":3964,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"off","ocean_gallery_id":[],"footnotes":""},"categories":[39],"tags":[],"class_list":["post-3959","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-botanique","entry","has-media"],"acf":[],"_links":{"self":[{"href":"https:\/\/vergersdelozere.net\/index.php\/wp-json\/wp\/v2\/posts\/3959"}],"collection":[{"href":"https:\/\/vergersdelozere.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vergersdelozere.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vergersdelozere.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vergersdelozere.net\/index.php\/wp-json\/wp\/v2\/comments?post=3959"}],"version-history":[{"count":26,"href":"https:\/\/vergersdelozere.net\/index.php\/wp-json\/wp\/v2\/posts\/3959\/revisions"}],"predecessor-version":[{"id":4172,"href":"https:\/\/vergersdelozere.net\/index.php\/wp-json\/wp\/v2\/posts\/3959\/revisions\/4172"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vergersdelozere.net\/index.php\/wp-json\/wp\/v2\/media\/3964"}],"wp:attachment":[{"href":"https:\/\/vergersdelozere.net\/index.php\/wp-json\/wp\/v2\/media?parent=3959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vergersdelozere.net\/index.php\/wp-json\/wp\/v2\/categories?post=3959"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vergersdelozere.net\/index.php\/wp-json\/wp\/v2\/tags?post=3959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}