Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Ivan P. O'Halloran"'
Publikováno v:
Journal of Great Lakes Research. 47:145-159
Nutrient export from agricultural land to surface waters is a significant environmental concern within the Great Lakes Basin (GLB). A field-based watershed-scale study was completed to investigate spatial and temporal variations of phosphorus and nit
Autor:
R. Paul Voroney, Ivan P. O'Halloran, Tandra D. Fraser, Derek H. Lynch, Martin H. Entz, Kari E. Dunfield
Publikováno v:
Canadian Journal of Soil Science. 99:292-304
Soil phosphorus (P) availability may be impacted by management practices, thereby affecting plant P uptake and plant response to P amendments. The aim of this study was to determine the effects of long-term management on soil P pools and to assess th
Autor:
Kimberley D. Schneider, Derek H. Lynch, Joanne R. Thiessen Martens, Henry F. Wilson, Ivan P. O'Halloran, D. Keith Reid, Francis Zvomuya, Tandra D. Fraser
Publikováno v:
Journal of Environmental Quality. 48:1247-1264
Soil phosphorus (P) cycling in agroecosystems is highly complex, with many chemical, physical, and biological processes affecting the availability of P to plants. Traditionally, P fertilizer recommendations have been made using an insurance-based app
Publikováno v:
Agronomy Journal. 111:859-866
An industry-led renaissance of nutrient management is occurring in North America to apply the correct rate, source, placement, and timing. Crop consultants have recently recommended including fertilizer N in a 5- by 5-cm band during sugarbeet (Beta v
Autor:
Ivan P. O'Halloran, Peter H. Sikkema, Laura L. Van Eerd, Miss Maria A Rojas, Darren E. Robinson
Publikováno v:
Canadian Journal of Plant Science. 98:990-1004
Cover crop (CC) prevalence between cash crop systems is contributing to long-term sustainable crop production systems. However, herbicide residue impact on CC root growth and its subsequent effect on soil aggregation and fertility are unknown. An unt
Autor:
J.J.H. Ciborowski, Y.C. Zhao, Ivan P. O'Halloran, Y.M. Zhao, Y.T. Wang, C.S. Tan, Tiequan Zhang, Z.M. Qi
Publikováno v:
Water research. 188
Lake Erie harmful algal blooms and hypoxia are two major environmental problems, and have severe impacts on human health, aquatic ecosystems, and the economy. However, little is known about internal loading of phosphorus (P) from sediments, which pos
Autor:
Christopher J. Van Esbroeck, Genevieve Ali, Ivan P. O'Halloran, Richard R. Brunke, Kevin McKague, Merrin L. Macrae, Janina M. Plach, Gilian Opolko, Gabrielle Ferguson, Tatianna M. Lozier, W. Vito Lam, M. C. English
Publikováno v:
Journal of Environmental Quality. 47:96-105
Phosphorus (P) mobilization in agricultural landscapes is regulated by both hydrologic (transport) and biogeochemical (supply) processes interacting within soils; however, the dominance of these controls can vary spatially and temporally. In this stu
Publikováno v:
Agronomy Journal. 109:2343-2357
Publikováno v:
Journal of Great Lakes Research. 42:1260-1270
Agricultural watersheds have been identified as a source of nutrients to surface water bodies, contributing to the degradation of water quality. Reduced till (RT) management practices have been employed to reduce the potential for particulate P loss
Publikováno v:
Geoderma. 279:70-76
The forms of phosphorus (P) in animal manure composts are different from that of synthetic P fertilizers, and this affects how soil P chemistry will be altered when they are used as P amendments. This study is an extension of a previously reported in