|Kanwar, R - IOWA STATE UNIVERSITY|
|Pederson, C - IOWA STATE UNIVERSITY|
Submitted to: American Society of Agricultural Engineers Meetings Papers
Publication Type: Other
Publication Acceptance Date: August 14, 1997
Publication Date: N/A
Technical Abstract: Swine manure applied as a source of nutrients for corn production has been implicated as a potential source of groundwater contaminants. The objective of this study was to evaluate the effects of manure application and innovative N management practices on groundwater quality. The field studies were initiated in the fall of 1993. The tillage and management treatments included the use of the late-spring nitrate-nitrogen (NO3-N) test and a reduced N fertilizer application rate of 112 kg ha**-1 applied to corn rotated with soybeans under either no-till or chisel plow tillage management. In a separate treatment, swine manure was used as the N source for corn grown in rotation with soybeans. Alternative crop management strategies included continuous corn fertilized with either swine manure or 135 kg ha**-1 of UAN, a narrow-strip cropping configuration that included corn, soybeans, and oats followed by a N-fixing berseem clover, and alfalfa. The results of this study indicate that the use of swine manure as a source of nutrients for corn-soybean production has the potential to reduce negative water quality impacts with proper manure management.