{"id":53219,"date":"2003-10-01T00:00:00","date_gmt":"2018-12-04T05:15:45","guid":{"rendered":"https:\/\/aprifel-pp.mentalworks.biz\/fr\/resume-scientifique\/how-well-do-critical-nitrogen-concentrations-work-for-cabbage\/"},"modified":"2018-12-04T06:15:45","modified_gmt":"2018-12-04T05:15:45","slug":"how-well-do-critical-nitrogen-concentrations-work-for-cabbage","status":"publish","type":"resume","link":"https:\/\/aprifel-pp.mentalworks.biz\/fr\/resume-scientifique\/how-well-do-critical-nitrogen-concentrations-work-for-cabbage\/","title":{"rendered":"How well do critical nitrogen concentrations work for cabbage, carrot, and onion crops?"},"content":{"rendered":"<p style=\"text-align: justify\">With the introduction of nutrient management legislation in Ontario, there is a need to improve the efficiency of nitrogen (N) utilization. One possibility is to use critical nutrient concentrations in plant tissue as an indicator of the N nutritional status of the crop. Plant tissue analysis was used to determine the total N and nitrate-N (NO3-N) concentrations of cabbage (Brassica oleracea var. capitata L.), carrots (Daucus carota L.), and onions (Allium cepa L.) grown in Ontario. The tissue samples were collected from plants as part of N fertilization studies from 1999 to 2001 on the organic soils in the Holland\/Bradford Marsh area and the mineral soils near Simcoe, Ontario. Yield was assessed at harvest as an indicator of the N requirement of the crop. Testing the usefulness of critical NO3-N concentrations to indicate the N requirement of the crop was problematic because: 1) few published references were available to indicate a critical level of NO3-N in these crops; 2) tissue NO3-N concentrations were highly variable; and 3) field data rarely matched published references. Tissue total N concentrations from the trials corresponded to published critical N concentrations in some cases, however, the use of published critical N concentrations would have resulted in either over or under-application of fertilizer to the crops. Cultivar, soil type, and climate were shown to affect tissue N concentrations. Based on these results it was concluded that local research and field verification is required before tissue N critical nutrient concentrations become useful for determining fertilizer needs of cabbage, carrots, and onions grown in Ontario.<\/p>\n","protected":false},"template":"","mots_cles":[],"class_list":["post-53219","resume","type-resume","status-publish","hentry"],"acf":{"adresse":"WESTERVELD SM,UNIV GUELPH,DEPT PLANT AGR;N1G 2W1 GUELPH ON, CANADA.","annee":"2003","mois":"10","numero":"38:6","page":"1122-1128","auteurs":[{"ID":53216,"post_author":"0","post_date":"2018-12-04 06:15:43","post_date_gmt":"2018-12-04 05:15:43","post_content":"","post_title":"Mcdonald","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"mcdonald-4","to_ping":"","pinged":"","post_modified":"2018-12-04 06:15:43","post_modified_gmt":"2018-12-04 05:15:43","post_content_filtered":"","post_parent":0,"guid":"https:\/\/aprifel-pp.mentalworks.biz\/fr\/auteur\/mcdonald-4\/","menu_order":0,"post_type":"auteur_resume","post_mime_type":"","comment_count":"0","filter":"raw"},{"ID":51513,"post_author":"0","post_date":"2018-12-04 05:39:09","post_date_gmt":"2018-12-04 04:39:09","post_content":"","post_title":"Mckeown","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"mckeown","to_ping":"","pinged":"","post_modified":"2018-12-04 05:39:09","post_modified_gmt":"2018-12-04 04:39:09","post_content_filtered":"","post_parent":0,"guid":"https:\/\/aprifel-pp.mentalworks.biz\/fr\/auteur\/mckeown\/","menu_order":0,"post_type":"auteur_resume","post_mime_type":"","comment_count":"0","filter":"raw"},{"ID":53217,"post_author":"0","post_date":"2018-12-04 06:15:44","post_date_gmt":"2018-12-04 05:15:44","post_content":"","post_title":"Scott-dupree","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"scott-dupree","to_ping":"","pinged":"","post_modified":"2018-12-04 06:15:44","post_modified_gmt":"2018-12-04 05:15:44","post_content_filtered":"","post_parent":0,"guid":"https:\/\/aprifel-pp.mentalworks.biz\/fr\/auteur\/scott-dupree\/","menu_order":0,"post_type":"auteur_resume","post_mime_type":"","comment_count":"0","filter":"raw"},{"ID":53218,"post_author":"0","post_date":"2018-12-04 06:15:44","post_date_gmt":"2018-12-04 05:15:44","post_content":"","post_title":"Westerveld","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"westerveld","to_ping":"","pinged":"","post_modified":"2018-12-04 06:15:44","post_modified_gmt":"2018-12-04 05:15:44","post_content_filtered":"","post_parent":0,"guid":"https:\/\/aprifel-pp.mentalworks.biz\/fr\/auteur\/westerveld\/","menu_order":0,"post_type":"auteur_resume","post_mime_type":"","comment_count":"0","filter":"raw"}],"sources":[{"ID":48719,"post_author":"0","post_date":"2018-12-04 04:42:05","post_date_gmt":"2018-12-04 03:42:05","post_content":"","post_title":"HORTSCIENCE","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"hortscience","to_ping":"","pinged":"","post_modified":"2018-12-04 04:42:05","post_modified_gmt":"2018-12-04 03:42:05","post_content_filtered":"","post_parent":0,"guid":"https:\/\/aprifel-pp.mentalworks.biz\/fr\/source\/hortscience\/","menu_order":0,"post_type":"source","post_mime_type":"","comment_count":"0","filter":"raw"}]},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.6 (Yoast SEO v23.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How well do critical nitrogen concentrations work for cabbage, carrot, and onion crops? 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