Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 May 1967
Published in Agron J 59:219-222 (1967)
© 1967 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Nitrogen Effect on Leaf Area, Yield, and Nitrogen Uptake of Barley under Moisture Stress1

R. E. Luebs and A. E. Laag2

Two nitrogen and two moisture levels were combined in 4 treatments to study nitrogen and moisture effects on barley grown under moisture stress conditions. Nitrogen was applied at 17 and 68 kg/ha and moisture levels differed by 3.7 surface cm at heading. The higher nitrogen level increased dry matter production during the vegetative growth period. Green leaf area (both sides) reached a maximum of 4.8 times the land area at late jointing and decreased because of moisture stress thereafter. Green leaf area was higher for over a month between late jointing and the soft dough stage with higher nitrogen. This greater transpiring area is suggested as the cause for grain yield decreases with more nitrogen. Increased moisture stress with higher nitrogen was indicated by decreased green to necrotic leaf weight ratios and greater straw to grain weight ratios.

Additional applied nitrogen was reflected in increased uptake of nitrogen. However, for a given nitrogen level, nitrogen content was higher at the lower moisture level.

The additional 3.7 cm of water at heading increased average barley grain yield 560 kg/ha and increased moisture use efficiency up to 23.3 kg per hectare-centimeter of water for the growing season.

Key Words: Barley growth rate • moisture use by barley • dryland cropping • straw grain ratios • barley necrosis

1 Contribution from the Soil and Water Conservation Research Division, Agricultural Research Service, USDA, and the California Agricultural Experiment Station.

2 Research Soil Scientist, USDA, and Principal Laboratory Technician, University of California, Riverside.

Received for publication December 1, 1966.




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Copyright © 1967 by the American Society of Agronomy.