wheat nitrogen diagnostics in the yaqui valley

Wheat Nitrogen Diagnosticsin the Yaqui Valley

OBJECTIVE

• To develop diagnostic tools that will help farmers apply the optimum economic nitrogen rate in wheat.

• To transfer this knowledge intensive technology into farmers’ fields.

On-farm Nitrogen x Variety Trials Y00-01

Location (Block)

Gra

in y

ield

(kg

/ha

) a

t 1

2%

mo

istu

re

4000

5000

6000

7000

8000 0 125 F 125 N 250

1603 710 814

On Farm Trials Year 2001-2002

Location

Gra

in y

ield

at 1

2%

moi

stu

re (

kg/h

a)

4500

5000

5500

6000

6500

7000

7500

75-0-25 125 kgN/ha0-33-66 125 kgN/ha 0-33-33 250 kgN/ha 0 kgN/ha

Block 612 Block 812

2000300040005000600070008000

1 2 3 4 5 6 7 8 9 10 11 12 13 14

N rate (kgN/ha)

Gra

in Y

ield

(kg/

ha)

194

142 250

100 125

125

125125

250

250

00

On-farm Trials 2002-2003

NDVI

N richStrip

N rate Experiment

Area Fertilized According to the Sensor

N Rich Strip N Deficient Area

NDVI = 0.65 NDVI = 0.31

Yield Potential

300N 0N

246 kgN/ha6831kg

Vs123 kgN/ha

7068kg

Manuel Lopez de Lara

No YieldDifference0 vs 300N

300 N 0N

Don Melquiades

300 kgN/haVs

180 kgN/ha

No Yield Difference

Cesar Valenzuela

11 tons Chicken ManureVs.

20 tons Chicken Manure

No Yield Difference

Union Cajeme

Insisted in 150 kg N moreOver the 11 tons Chicken Manure

Technical Adviser called me and asked me if I was making

that recommendation

Farmer Basal N rate N rate Experiment

SensorRec.

C.Valenzuela 135 N No response 0

L.A. Amaya 150 N No response 0

S. Dabdub 175 N No response 0

J. Castro 100 N No response 0

E. Pablos 0 N 200 N 0

M. Lopez de Lara

150N No response 0

J. Felix Sacos No response 0

E. Olea 100N Lost 0

On-farm Trials for Validation of theSensor

N RichStrip

N RichStrip

300N 0N

246 kgN/ha6831kg

Vs123 kgN/ha

7068kg

Manuel Lopez de Lara

No YieldDifference0 vs 300N