Long term field research for developing nitrogen bmp s
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Long-Term Field Research for Developing Nitrogen BMP’s. Gyles Randall Univ. of Minnesota Southern Research and Outreach Center grandall@umn.edu http://sroc.coafes.umn.edu/. Factors relating to BMP’s for N. Cropping systems N rate applied Time of application Nitrification inhibitors

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Long term field research for developing nitrogen bmp s

Long-Term Field Research for Developing Nitrogen BMP’s

Gyles Randall

Univ. of Minnesota

Southern Research and Outreach Center

grandall@umn.edu

http://sroc.coafes.umn.edu/


Factors relating to bmp s for n
Factors relating to BMP’s for N

  • Cropping systems

  • N rate applied

  • Time of application

  • Nitrification inhibitors

  • N source

  • Tillage

  • Cover crops



Long term field research for developing nitrogen bmp s

Effect of CROPPING SYSTEM on drainage volume, NO3-N concentration, and N loss in subsurface tile drainage during a 4-yr period (1990-93) in MN.


Nitrate losses in tile drainage water from soil mineralization
Nitrate losses in tile drainage water from soil mineralization.

Established grass

Dry years


Conclusion
CONCLUSION mineralization.

  • Cropping system has greater effect on hydrology and nitrate losses than any other management factor!

    “Preventive Management”


Rate of application
RATE OF APPLICATION mineralization.



Effect of n rate for corn after soybean on no 3 n concentrations in tile drainage water in 2001
Effect of N rate for corn after soybean on NO mineralization.3-N concentrations in tile drainage water in 2001.


Long term field research for developing nitrogen bmp s

Effect of N rate on yield of corn after soybean, net return to fertilizer N, and nitrate-N concentration in tile drainage at Waseca (2000–2003).


Long term field research for developing nitrogen bmp s

Effect of N rate applied for corn in 2003 on nitrate-N concentration and loss in tile drainage during May–September 2004 from soybeans at Waseca.


Conclusion1
Conclusion concentration and loss in tile drainage during May–September 2004 from soybeans at Waseca.

  • Corn yields were increased 5% and nitrate losses in drainage were reduced by 27% when reducing the N application rate from 160 lb/A applied in the fall to the recommended 120-lb rate applied in the spring.

  • Reducing the N rate from 120 lb/A to 80 lb/A reduced yield by 17% and nitrate loss by 13%.

  • Forty-six percent of the nitrate lost in tile drainage from a corn-soybean rotation was lost in the year soybeans were grown.


Time of n application
TIME OF N APPLICATION concentration and loss in tile drainage during May–September 2004 from soybeans at Waseca.


Effect of time of n application and n serve on corn yields after soybean from 1987 2001 at waseca
Effect of time of N application and N-Serve on corn yields after soybean from 1987–2001 at Waseca.


Long term field research for developing nitrogen bmp s
Nitrate-N concentration in tile drainage from a corn-soybean rotation as influenced by time of N application and N-Serve at Waseca.


Long term field research for developing nitrogen bmp s
1999 tile water NO rotation as influenced by time of N application and N-Serve at Waseca.3-N loading at Waseca vs. NO3-N concentrations in the Le Sueur River 2.3 miles from Mankato.


Conclusion2
Conclusion rotation as influenced by time of N application and N-Serve at Waseca.

  • Compared to late fall N application without N-Serve over the 15-year period:

    • Corn yields were increased 9 and 12 bu/A/yr (6 and 8%) by either fall N+N-Serve or spring preplant N, respectively.

    • Nitrate losses were decreased 14 and 15% by either fall N+N-Serve or spring preplant N, respectively.


Region specific bmps for n
Region Specific BMPs for N rotation as influenced by time of N application and N-Serve at Waseca.


Proposed bmp s for south central mn
Proposed BMP’s for South-Central MN rotation as influenced by time of N application and N-Serve at Waseca.

  • Recommended

    • Spring preplant or split applications of ammonia, urea, or UAN are highly recommended.

    • Incorporate broadcast urea or preplant UAN within three days.

    • Apply sidedress application before corn is 12” high.

    • Inject or incorporate sidedress applications of urea or UAN to a minimum depth of 4 inches.


Proposed bmp s for south central mn cont
Proposed BMP’s for South-Central MN cont. rotation as influenced by time of N application and N-Serve at Waseca.

  • Recommended, but with greater risk

    • Fall application of AA + N-Serve after soil temperature at 6-inch depth is below 50° F.

    • Side dressing all N before corn is 12 inches high.

  • Not recommended

    • Fall application of urea, UAN, or anhydrous ammonia without N-Serve


Thanks

THANKS rotation as influenced by time of N application and N-Serve at Waseca.

Gyles Randall

grandall@umn.edu

Southern Research and Outreach Center

grandall@umn.edu

http://sroc.coafes.umn.edu/