J. Humphreys

Publications83
h-index21
Citations1,460
Highly Influential Citations106
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MAJOR AND MICRO NUTRIENT ADVICE FOR PRODUCTIVE AGRICULTURAL CROPS
1 Johnstown Castle Research Centre, Wexford 2 Oakpark Research Centre, Carlow 3 Moorepark Research Centre, Fermoy, Co Cork 4 Kinsealy Research Centre, Co Dublin 5 Grange Research Centre, Co Meath 6… Expand
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Forage Legumes for Grazing and Conserving in Ruminant Production Systems
As a plant group, forage legumes present some unique advantages and disadvantages for ruminant production. When compared to grasses or cereals their main advantages are generally (i) low reliance on… Expand
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An appraisal of carbon footprint of milk from commercial grass-based dairy farms in Ireland according to a certified life cycle assessment methodology
PurposeLife cycle assessment (LCA) studies of carbon footprint (CF) of milk from grass-based farms are usually limited to small numbers of farms (<30) and rarely certified to international standards,… Expand
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Farm-gate nitrogen balances on intensive dairy farms in the south west of Ireland
Nitrogen management and farm-gate N balances were evaluated on 21 intensive dairy farms in the south west of Ireland for each of four years (2003 to 2006). The mean annual stocking density was… Expand
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Interannual variation in nitrous oxide emissions from perennial ryegrass/white clover grassland used for dairy production
Nitrous oxide (N2O) emissions are subject to intra- and interannual variation due to changes in weather and management. This creates significant uncertainties when quantifying estimates of annual N2O… Expand
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An evaluation of life cycle assessment of European milk production.
Life cycle assessment (LCA) is a method regulated by ISO that conveys the environmental impact of products. LCA studies of the same product should be comparable to benefit environmental policy… Expand
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Nitrogen flows and balances in four grassland‐based systems of dairy production on a clay‐loam soil in a moist temperate climate
This study examined productivity, nitrogen (N) flows and N balances in grassland-based systems of dairy production in Ireland. There were four stocking densities of dairy cows on grass/white clover… Expand
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Groundwater: A pathway for terrestrial C and N losses and indirect greenhouse gas emissions
Abstract Estimating losses of dissolved carbon (C) and nitrogen (N) via groundwater in an agricultural system provides insights into reducing uncertainties in the terrestrial C and N balances. In… Expand
  • 48
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Comparison of milk production from clover-based and fertilizer-N-based grassland on a clay-loam soil under moist temperate climatic conditions.
This study, conducted over four years (2003-2006), compared herbage production, nutritive value of herbage, the length of the grazing season and milk production per cow and per hectare from grassland… Expand
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Effects of seed-borne Microdochium nivale on establishment and grain yield of winter-sown wheat.
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