Testing Soils and Cornstalks to Evaluate Nitrogen Management on the Watershed Scale

Methods of Soil Analysis

1996 • 1,924 citations

Soil Testing and Plant Analysis

1990 • 1,617 citations

Effect of stream channel size on the delivery of nitrogen to the Gulf of Mexico

2000 • 1,112 citations

Soil Testing and Plant Analysis

1974 • 912 citations

Nutrient Changes in the Mississippi River and System Responses on the Adjacent Continental Shelf

1996 • 843 citations

Nitrogen in Crop Production

1984 • 762 citations

Changes in Mississippi River Water Quality This Century

1991 • 675 citations

Nitrate Loss in Subsurface Drainage as Affected by Nitrogen Fertilizer Rate

2001 • 369 citations

A Soil Test for Nitrogen Availability to Corn

1984 • 339 citations

Nitrate contamination of groundwater in North America

1989 • 328 citations

Does the crop or the soil indicate how to save nitrogen in maize production?

2000 • 308 citations

The Enigma of Soil Nitrogen Balance Sheets

1955 • 245 citations

Correlations between Soil Nitrate Concentrations in Late Spring and Corn Yields in Iowa

1989 • 240 citations

Nitrate‐Nitrogen in Tile Drainage as Affected by Fertilization

1981 • 220 citations

Soil and Tissue Nitrate Tests Compared for Predicting Soil Nitrogen Availability to Corn

1989 • 217 citations

Water Quality in Walnut Creek Watershed: Herbicides and Nitrate in Surface Waters

1999 • 205 citations

Water Quality in Walnut Creek Watershed: Nitrate‐Nitrogen in Soils, Subsurface Drainage Water, and Shallow Groundwater

1999 • 191 citations

The Effects of Uncertainty on Optimal Nitrogen Applications

1992 • 181 citations

Nitrate in Ground Water in the United States

1989 • 169 citations

Assessment of Soil Nitrogen Availability

2013 • 168 citations

Nitrate Accumulation in Soils and Loss in Tile Drainage Following Nitrogen Applications to Continuous Corn

1978 • 143 citations

The Relationship of Nitrate Concentrations in Streams to Row Crop Land Use in Iowa

2000 • 139 citations

Animal Waste Utilization: Effective Use of Manure as a Soil Resource

1997 • 137 citations

Corn Yield and Residual Soil Nitrate as Affected by Time and Rate of Nitrogen Application

1989 • 133 citations

Relationships between Corn Yields and Soil Nitrate in Late Spring

1992 • 130 citations

Tissue Test for Excess Nitrogen during Corn Production

1990 • 129 citations

Des Moines River Nitrate in Relation to Watershed Agricultural Practices: 1945 Versus 1980s

1993 • 125 citations

Presidedress Soil Nitrate Test Evaluation in Maryland

1992 • 121 citations

Optimal Concentrations of Nitrate in Cornstalks at Maturity

1992 • 115 citations

Evaluation of Soil and Plant Nitrogen Tests for Maize on Manured Soils of the Atlantic Coastal Plain

1995 • 106 citations

Effects of Climatic Variations over 11 Years on Nitrate‐Nitrogen Concentrations in the Raccoon River, Iowa

1993 • 95 citations

A soil test for nitrogen availability in the northeastern United States

1990 • 95 citations

Factors Influencing Corn Fertilizer N Requirements in the Northern U.S. Corn Belt

1990 • 85 citations

Recovery of Anhydrous Ammonia‐Derived Nitrogen‐15 During Three Years of Corn Production in Iowa

1988 • 83 citations

Comparison of Late‐Season Diagnostic Tests for Predicting Nitrogen Status of Corn

2001 • 79 citations

Gulf of Mexico Hypoxia: Land and Sea Interactions

1999 • 71 citations

Rural Groundwater Contamination

1988 • 63 citations

Nitrogen and Irrigation Management Practices to Minimize Nitrate Leaching from Irrigated Corn

1991 • 60 citations

Optimal Rates of Nitrogen Fertilization for First-Year Corn after Alfalfa

1993 • 50 citations

Agriculture and Groundwater Quality

1989 • 50 citations

Swine manure management plans in North-Central Iowa: Nutrient loading and policy implications

2000 • 47 citations

Diagnostic Efficiency of the Blacklayer Stalk Nitrate and Grain Nitrogen Tests for Corn

2000 • 40 citations

Water quality in the eastern Iowa basins, Iowa and Minnesota, 1996-98

2000 • 37 citations

Soil and Water Quality: An Agenda for Agriculture

1994 • 35 citations

Effect of Fertilization Method and Tillage on Nitrogen‐15 Recovery by Corn

1990 • 34 citations

End-of-Season Corn Stalk Test for Excess Nitrogen in Silage Corn

1999 • 31 citations

Factors that Influence Loss of Fall Applied Fertilizers and Their Probable Importance in Different Sections of the United States

1955 • 27 citations

Effects of Nitrapyrin on Corn Yields and Recovery of Ammonium-N at 18 Site-Years in Iowa

1990 • 20 citations

Ground-Water Contamination by Dissolved Nitrate

1967 • 12 citations