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Tissue Testing Guidelines for N Management in Irrigated Malting Barley, Maricopa, 1999

Malting barley is not a widely planted crop in the Southwest, due to grain protein contents that can sometimes exceed the industry standard of 11.4 %. To achieve < 11.4% grain protein, careful nitrogen (N) management is needed. Tissue testing guidelines for N management for reduced grain protein and acceptable yields have not yet been determined for malting barley in the Southwest. The objectives of this study were to: (i) correlate NO₃-N in dried stem tissue with sap NO₃-N, and (ii) develop stem NO₃-N guidelines for N management in malting barley. In November 1998 two varieties of malting barley, Morex and Crystal, were planted at the Maricopa Agricultural Center. Five N rates (0, 60, 120, 180, and 240 lbs/acre) were applied in four split applications. Each treatment was replicated three times in a randomized complete block design. Samples were collected from lower stems at the 3-4 leaf 2 node, and flag leaf visible growth stages. Grain yields ranged from 1011 lbs/A to 2677 lbs/A for Morex and 827 lbs/A to 2641 lbs/A for Crystal. Grain protein ranged from 6.94 -11.5% (Morex) and 8.48-13.0% (Crystal). Correlation coefficients between stem NO₃-N and sap NO₃-N were 0.83 for Morex and 0.85 for Crystal. For Morex and Crystal, grain protein was within the malting industry grain protein range of 10.5-11.4% and yield was optimized at 180 lbs N/A. Sap NO₃ analysis can be a useful tool for determining N status of malting barley.

Identiferoai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/205159
Date05 1900
CreatorsRiley, E. A., Thompson, T. L., White, S. A., Ottman, M. J.
ContributorsOttman, Michael J.
PublisherCollege of Agriculture, University of Arizona (Tucson, AZ)
Source SetsUniversity of Arizona
Languageen_US
Detected LanguageEnglish
Typetext, Article
RelationAZ1147, Series P-119

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