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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
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Foliar Applications of UAN32 in Irrigated Spring Wheat Ivan Ortiz-Monasterio CIMMYT
Materials and MethodsY05-06 • 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 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).
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.