{"id":15198,"date":"2013-09-25T14:55:44","date_gmt":"2013-09-25T20:55:44","guid":{"rendered":"http:\/\/prairieswine.com\/rsc\/?p=15198"},"modified":"2013-09-25T14:56:04","modified_gmt":"2013-09-25T20:56:04","slug":"appropriateness-of-nutrient-budgets-for-environmental-risk-assessment-a-case-study-of-outdoor-pig-production-sandra-edwards","status":"publish","type":"post","link":"http:\/\/prairieswine.com\/rsc\/appropriateness-of-nutrient-budgets-for-environmental-risk-assessment-a-case-study-of-outdoor-pig-production-sandra-edwards\/","title":{"rendered":"Appropriateness of nutrient budgets for environmental risk assessment: a case study of outdoor pig production"},"content":{"rendered":"<p>Outdoor pig production has expanded rapidly in recent years due to economic and market pressures. Recent research\u00a0has shown that a high degree of heterogeneity in soil nutrient distribution can occur as a result of this agricultural\u00a0system. This study examined the consequences of dietary manipulation on total excretion and spatial distribution of N\u00a0and P in soils under outdoor sow production. Small areas of land chosen for excretion received excessive amounts of\u00a0both N and P. Values equivalent to up to 2861 kg ha\u00011 of soluble N were observed in preferred areas, up to 90% of this\u00a0was in organic forms. Within 15 months, applied nutrients were sufficient to saturate the soil profile in preferred areas\u00a0with respect to P and produce areas that represented a significant environmental risk. Lowering the amount of N and P\u00a0in the diet has potential to reduce environmental impact but cannot eliminate spatial variability. The use of simple input\u00a0output nutrient budgeting approaches may underestimate losses of N and P as they cannot account for mineralisation\u00a0rates of organic nutrients excreted or for P saturation in areas preferentially used for excretion.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Outdoor pig production has expanded rapidly in recent years due to economic and market pressures. Recent research\u00a0has shown that a high degree of heterogeneity in soil nutrient distribution can occur as a result of this agricultural\u00a0system. This study examined the consequences of dietary manipulation on total excretion and spatial distribution of N\u00a0and P in soils [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19,928],"tags":[8692,2771,4264,3742,14,18011],"class_list":["post-15198","post","type-post","status-publish","format-standard","hentry","category-pork-insight-articles","category-welfare","tag-harold-gonyou","tag-iron","tag-outdoor","tag-outdoor-production","tag-pig","tag-tot"],"_links":{"self":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/15198","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/comments?post=15198"}],"version-history":[{"count":2,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/15198\/revisions"}],"predecessor-version":[{"id":15201,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/15198\/revisions\/15201"}],"wp:attachment":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/media?parent=15198"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/categories?post=15198"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/tags?post=15198"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}