کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1057891 947095 2007 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A spreadsheet model for developing field indicators and grazing management tools to meet environmental and production targets for dairy farms
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
پیش نمایش صفحه اول مقاله
A spreadsheet model for developing field indicators and grazing management tools to meet environmental and production targets for dairy farms
چکیده انگلیسی

Changes in livestock farm structure, such as increasing land area per animal, as well as developments in national and European agricultural policies may lead to changes in grazing and fertilizer management practices for environmental or economic reasons. To facilitate choices and the learning of new practices at the farm level, such as the amount of land to allocate for grazing or of fertilizer to apply, we propose to combine a simplified grass growth and N model with two sward indicators. One assesses the sward nitrogen status to evaluate animal excreted N; the other assesses the standing herbage mass to characterize the grazing management. Following a description of the model (first part), we use it as a research tool for highlighting grazing management (second part). First we analyze how stocking rate, N excreted, grazing and N use efficiency varied according to management (i.e., the time between two grazing events), sward (N status, leaf lifespan) and weather characteristics. Next we use it for determining field indicator thresholds at key periods that allow agricultural and environmental aims to be met; these thresholds being intended to give guidance to meet farmers’ objectives. In the last part, we illustrate how to combine model and field indicators for planning and monitoring a management strategy suitable for the management of risks.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Management - Volume 82, Issue 2, January 2007, Pages 207–220
نویسندگان
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