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 [email protected] 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

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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

[email protected]

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


Cropping systems

CROPPING SYSTEMS


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

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

    “Preventive Management”


Rate of application

RATE OF APPLICATION


Continuous corn 2001 03 olmsted co

Continuous Corn, 2001–03 Olmsted Co.


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 NO3-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

  • 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


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 NO3-N loading at Waseca vs. NO3-N concentrations in the Le Sueur River 2.3 miles from Mankato.


Conclusion2

Conclusion

  • 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


Proposed bmp s for south central mn

Proposed BMP’s for South-Central MN

  • 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.

  • 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

Gyles Randall

[email protected]

Southern Research and Outreach Center

[email protected]

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


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