8/19/2002--Soil erosion: effect on soil productivity (Al-Kaisi, Hanna, Miller and Tidman) 8/19/2002--Equipment maintenance: time to check the combine (Hanna, Al-Kaisi and Tidman) 7/8/2002--Soil Compaction may be cutting into your yield (Hanna, Al-Kaisi and Tidman) 6/24/2002--Conservation buffers can improve water quality (Al-Kaisi, Hanna and Tidman) 6/17/2002--Inspecting drainage systems (Al-Kaisi, Melvin, Hanna, Tidman) 5/27/2002--Test cornfields for nitrate if manure was not incorporated (Blackmer and Van De Woestyne) 5/13/2002--Methods for measuring crop residue (Al-Kaisi, Hanna, Tidman) 5/6/2002--Post-planting tillage: What are the options? (Al-Kaisi, Hanna, and Tidman) 4/15/2002--Precision agriculture - what we've learned (Cummins, Pecinovsky, Lotz, and DeWitt) 4/15/2002--Does dry weather limit tillage options? (Al-Kaisi, Hanna, and Tidman) 4/8/2002--Equipment maintenance: planters (Hanna, Al-Kaisi, and Tidman) 3/18/2002--Corn yields at reduced rates of spring nitrogen in 2002 (Blackmer and Van De Woestyne) 3/18/2002--Should fertilizer nitrogen be applied after injected swine manure? (Van De Woestyne and Blackmer) 3/18/2002--Do I need to till my soil? (Al-Kaisi and Reicosky) 3/18/2002--Field observations are key when planning spring work (Al-Kaisi, Hanna and Tidman) 2/18/2002--Equipment maintenance: fertilizer applicators (Hanna, Sawyer and Tidman) 2/18/2002--75/125 N-rate comparison in 2001 (Van De Woestyne and Blackmer) 1/21/2002--Fall Nitrification Happened (Blackmer and Kyveryga) 1/21/2002--Tillage Equipment Maintenance (Hanna and Al-Kaisi) 12/24/2001--Sediment and total maximum daily loads (Al-Kaisi, Hanna, Ehm, Creswell and Tidman) 11/19/2001--Winter grazing and pasture erosion (Al-Kaisi, Hanna, Barnhart, Russell and Tidman) 10/22/2001--Water quality in the eastern Iowa basins (Kalkhoff, et. al.) 10/22/2001--Application checkpoints for fall ammonia (Hanna and Sawyer) 10/22/2001--Nitrogen application questions (Sawyer) 10/22/2001--Tillage in 2002 - consider the options (Al-Kaisi, Hanna, and Tidman) 10/22/2001--Why 50 degrees F? (Sawyer) 9/17/2001--Plan for 2002 residue before harvest (Al-Kaisi, Hanna and Tidman) 8/20/2001--N management influences on N losses through tile lines (Randall and Sawyer) 8/20/2001--Fall tillage and tillage equipment (Al-Kaisi and Tidman) 7/30/2001--Managing pasture to reduce soil erosion (Al-Kaisi, Hanna, Barnhart and Tidman) 7/16/2001--Consider permanent vegetation for steeply sloping soils (Al-Kaisi, Hanna and Tidman) 7/2/2001--It is not too late to apply nitrogen for 2001 (Blackmer) 7/2/2001--Install and maintain terraces for conservation (Al-Kaisi and Hanna) 6/18/2001--Soil nitrate concentrations are low this year (Blackmer) 6/18/2001--Nitrogen losses in 2001 (Sawyer) 5/28/2001--Timing cultivation to complement conservation plans (Al-Kaisi, Hanna and Tidman) 5/21/2001--Preventing soil erosion after spring rains (Al-Kaisi, Hanna and Tidman) 5/14/2001--Watch for damage from broadcast postemerge UAN applications (Sawyer) 5/14/2001--Post-plant nitrogen applications on corn (Sawyer) 5/14/2001--Urea-ammonium nitrate as herbicide carrier in emerged corn (Hartzler, Owen and Pringnitz) 5/14/2001--Take a break and measure crop residue (Al-Kaisi, Hanna and Tidman) 5/7/2001--Use the rotary hoe for soil crusting (Hanna, Al-Kaisi and Tidman) 4/30/2001--How did your waterways fare this spring? (Al Kaisi and Tidman) 4/23/2001--Value of crop rotation in nitrogen management (Al-Kaisi) 4/9/2001--2001 Agriculture and the Environment Conference (Miller and Tidman) 4/9/2001--Equipment considerations: dry granular fertilizer (Hanna and Sawyer) 2/26/2001--Early season losses of nitrogen (Blackmer and Balkcom) 2/26/2001--Impact of soil management practices on yield (Al-Kaisi) 2/26/2001--Nitrate testing: early versus late spring (Blackmer) 2/26/2001--Nitrogen fertilizer management options (Sawyer) 2/26/2001--Soil erosion and water quality (Al-Kaisi and Tidman) 1/29/2001--Save nitrogen dollars after manure (Blackmer and Van De Woestyne) 1/29/2001--Optimal N rates in dry years (Blackmer and Kyveryga) 1/29/2001--Natural gas prices affect nitrogen fertilizer costs (Sawyer) 1/29/2001--Making every fertilizer nitrogen dollar pay (Sawyer) 1/29/2001--Soil erosion and crop productivity: topsoil thickness (Al-Kaisi) 1/29/2001--Impact of soil erosion on soil productivity (Miller and Tidman) 12/18/2000--Tillage management critical to profit (Hanna and Tidman) 12/18/2000--Water Quality Conference 2001 (Larson) 11/20/2000--Planning tillage for 2001 (Hanna, Al-Kaisi and Tidman) 10/23/2000--Survey: Iowa no-till holds steady (Al-Kaisi, Hanna and Tidman) 10/23/2000--Anhydrous application and dry soils (Sawyer) 10/23/2000--Pay attention to water management (Al-Kaisi and Hanna) 9/18/2000--NPKnowledge web site is now operational (Creswell) 9/18/2000--Tillage in 2001: No-till (Al-Kaisi, Hanna and Tidman) 8/21/2000--Total maximum daily loads: new rules (Creswell) 8/21/2000--Soil pH and losses of soil-applied ammonia (Blackmer, Kyverga and Isla) 8/21/2000--Tillage in 2001: fall strip tillage (Al-Kaisi and Hanna) 8/7/2000--Tillage in 2001: consider the options (Al-Kaisi, Hanna and Tidman) 8/7/2000--Is fall nitrogen profitable? (Blackmer and Ellsworth) 7/24/2000--Consider carbon sequestration on your farm (Al-Kaisi, Hurley, and Tidman) 7/24/2000--Soil erosion: An agricultural production challenge (Al-Kaisi) 7/10/2000--Fencing Cattle Away From Creeks (Moore, Miller and Tidman) 7/3/2000--What About N Losses This Year? (Sawyer) 7/3/2000--Value of Iowa's Wetlands (Al-Kaisi) 6/26/2000--Use conservation buffers to make dollars and sense (Al-Kaisi) 6/19/2000--Erosion in northeastern Iowa (Rodecap and Tidman) 6/12/2000--Conservation Buffers and Water Quality (Al-Kaisi) 6/5/2000--Don't forget about grassed waterways (Tidman and Miller) 3/20/2000--Iowa producers reduce erosion - 1997 NRI data (Miller and Tidman) 1/31/2000--Nutrient management education project (Wintersteen) 11/8/1999--Winter grazing management (Barnhart, Russell and Karlen) 10/11/1999--Southern Iowa tillage results (Secor) 8/9/1999--East central Iowa - weed control in no-till (Tidman) 6/21/1999--Plan and design of a riparian buffer (Tidman and Schultz) 6/28/1999--Trees Forever Iowa buffer initiative (Tidman) 6/14/1999--Riparian buffer systems - the basics (Isenhart and Tidman) 5/31/1999--Maintaining grass waterways (Tidman and Miller) 5/17/1999--Measure your crop residue (Tidman and Miller) 5/3/1999--Use crop residues for soil conservation (Tidman and Miller) 9/15/1997--Test cornstalks for nitrate this fall (Blackmer) 6/23/1997--Nitrogen availability from organic fertilizers (Blackmer) 4/2/1993--Many factors affect residue cover (Hanna)

8/20/2001--Phosphorus - why the concern about water quality? (Creswell, Mallarino, Miller, Sawyer and Tidman) 7/16/2001--Watershed-scale phosphorus management (Miller, Mallarino, Sawyer, Sauer, Creswell and Tidman) 5/14/2001--Phosphorus losses to surface water (Baker and Tidman) 4/16/2001--Phosphorus and swine feeding (Palmer Holden and Tidman) 2/26/2001--Soil resources of phosphorus (Fenton, Mallarino, Sawyer, Creswell and Tidman) 12/18/2000--Phosphorus in aquatic systems (Downing, Mallarino, Sawyer, Creswell and Tidman) 10/23/2000--Management of phosphorus for crop production (Mallarino, Sawyer, Creswell and Tidman) 9/18/2000--Soil testing and available phosphorus (Mallarino, Sawyer, Creswell and Tidman) 9/18/2000--Corn and soybean responses to deep-band phosphorus and potassium (Mallarino) 8/7/2000--Phosphorus basics (Sawyer, Mallarino, Creswell and Tidman) 4/24/2000--Why manage phosphorus? (Sawyer and Mallarino) 5/5/1999--Effective use of precision agriculture for improved management of phosphorus, potassium and lime, Mallarino) 1/18/1999--Interpreting P & K soil test results (Sawyer and Mallarino)

Phosphorus Indexing For Cropland by Mallarino, et. al., in Journal of Soil and Water Conservation

Nitrogen Management Basics (141K) Carbon Sequestration by Dr. Mahdi Al-Kaisi    (2.6MB) Iowa Water Quality Bureau, IDNR: TMDL Presentations and Publications (HTML Link)

USDA ARS: Agricultural Phosphorus and Eutrophication USDA ARS: Geographical distribution of excess agricultural nitrogen in the Gulf of Mexico USDA NRCS: Technical References