Foliar Applications of UAN32 in Irrigated Spring Wheat

Foliar Applications of UAN32 in Irrigated Spring Wheat

Ivan Ortiz-MonasterioCIMMYT

• Five soil N rates 0, 50, 100, 150, 200 kgN/ha (locations).

• Within each rate/location; two crops (Durum, Jupare and bread wheat, Kronstad) as main plots

• Four foliar N rates 0, 30, 60, 90 kgN/ha as subplots.

• Two reps• Plot size 1.8 x 5 m long (8 row plots, 20 cm

between rows).

Materials and MethodsY05-06

Materials and MethodsY05-06

• Soil applications at planting with urea.

• Foliar applications with 295 L water/ha.

• Foliar application of 90 kgN/ha UAN 32 was 19 L UAN32 in a 20 L backpack sprayer.

Materials and MethodsY05-06

• Planted Dec 02, 2005

• Foliar application with UAN32 on Jan 17, 2006.

• Zadoks stage Z31 (46 days after planting).

N SOIL (0kgN/ha)

Foliar Nitrogen (kg/ha)

0 30 60 90

Yie

ld (

kg/h

a)

0

2000

4000

6000

8000

10000

JupareKronstadPlot 1 Regr

8030 kg/ha Jupare6927 kg/ha Kronstad

97%

86%

0 30 60 90

0

2000

4000

6000

8000

10000

N SOIL (50 kgN/ha)

Foliar Nitrogen (kg/ha)

Yie

ld (

kg/h

a)

JupareKronstadPlot 1 Regr

114%

106%

0 30 60 90

0

2000

4000

6000

8000

10000

N SOIL (100 kgN/ha)

Foliar Nitrogen (kg/ha)

Yie

ld (

kg/h

a)

JupareKronstadPlot 1 Regr

106%

100%

0 30 60 90

0

2000

4000

6000

8000

10000

N SOIL (150 kgN/ha)

Foliar Nitrogen (kg/ha)

Yie

ld (

kg/h

a)

JupareKronstadPlot 1 Regr

100%

91%

0 30 60 90

0

2000

4000

6000

8000

10000

JupareKronstadPlot 1 Regr

N SOIL (200 kgN/ha)

Foliar Nitrogen (kg/ha)

Yie

ld (

kg/h

a)

100%

99%

Soil N kg ha-1

0 50 100 150 200

Whe

at

yiel

d kg

ha-

1

3000

4000

5000

6000

7000

8000

9000

JupareKronstad

Conclusions

• As the rate of foliar N increased, levels of leaf necrosis also increased 9 DAA.

• Necrosis due to UAN32 foliar applications was higher in Kronstand than in Jupare.

• Both crops were able to fully recover by 36 DAA.

Conclusions

• Foliar applications of UAN32 at Z31 are a viable alternative to fully correct N deficiency in wheat, except perhaps for Kronstad under sever N deficiency.

Thank you