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Sensor-based, site-specific N management in irrigated spring wheat in the Yaqui Valley, Mexico

Sensor-based, site-specific N management in irrigated spring wheat in the Yaqui Valley, Mexico. CIMMYT Oklahoma State University Stanford University. 31%. Losses due to runoff. Measurements in the Valley drains. NO 3 0 – 12 mg/L average 6 mg/L

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Sensor-based, site-specific N management in irrigated spring wheat in the Yaqui Valley, Mexico

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  1. Sensor-based, site-specific N management in irrigated spring wheat in the Yaqui Valley, Mexico CIMMYT Oklahoma State University Stanford University

  2. 31%

  3. Losses due to runoff • Measurements in the Valley drains. • NO3 0 – 12 mg/L average 6 mg/L • NH4 0 - 12 mg/L average 6 mg/L • Harrison, 2003

  4. $$$ Beman, 2005

  5. Main Factors Associated with NUE • Timing • Rate

  6. Cumulative nitrogen absorption curve in wheat 250 kgN/ha Farmer’s management 25% 0% 75% Fertilization

  7. Cumulative nitrogen absorption curve in wheat Best alternative 67% 33% 0% Fertilization

  8. Prob rain in January > X mm, 1969-2004 0.9 0.8 0.7 0.6 0.5 Prob > X 0.4 0.3 0.2 0.1 0 0 20 40 60 80 100 120 140 160 rain (mm)

  9. N Rate

  10. 1982-2002 Lobell, et al. 2002

  11. NDVI

  12. RESULTS 2005-2006

  13. N rich Strip 5 -20 ha Farmer’s Management Sensor Management

  14. Stage Z31-32

  15. Cumulative nitrogen absorption curve in wheat 250 kgN/ha Farmer’s management 25% 0% 75% Fertilization

  16. Potential Gains 250 Average N rate from farmer’s surveys 250 - 127 = 123 x 9 pesos = 1107 pesos/ha

  17. 272 N 0 N 270 x 9 pesos = 2430 pesos/ha 243,000 pesos/100 has

  18. 11 tons Chicken Manure Conventional Management + 150 units of N Sensor recommended ZERO His neighbor applied + 75 kg N on top of the 11 tons of CM. He did not apply any more N Yield was the same 150 x 9 = 1,350 Cesar Valenzuela

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