Foliar Applications of UAN32 in Irrigated Spring Wheat

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Presentation transcript:

Foliar Applications of UAN32 in Irrigated Spring Wheat Ivan Ortiz-Monasterio CIMMYT

Materials and Methods Y05-06 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 Methods Y05-06 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 Methods Y05-06 Planted Dec 02, 2005 Foliar application with UAN32 on Jan 17, 2006. Zadoks stage Z31 (46 days after planting).

8030 kg/ha Jupare 6927 kg/ha Kronstad 97% 86%

114% 106%

106% 100%

100% 91%

100% 99%

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