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Published online 1 March 1969
Published in Agron J 61:310-313 (1969)
© 1969 American Society of Agronomy
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Effect of Water Table Depth and Flooding on Yield of Millet1

R. E. Williamson, C. R. Willey and T. N. Gray2

Yields of millet (Pennisetum glaucum (L.) R. Br.) grown in both sheltered and nonsheltered soil tanks increased with water table depth to a depth of 76 cm. In the sheltered tanks yields were similar for all water table depths greater than 61 cm. The N, P, and K contents of plants grown grown with water tables at 15 or 30 cm in the sheltered tanks were significantly lower than for deeper water table depths. Except for the tanks with 15- and 30-cm water tables, the oxygen content by volume was generally above 18% at the 15-cm depth, indicating that the region of greatest root mass (0 to 8 cm) was probably well aerated. Since yields were affected by water table depths down to 76 cm, it appears that the few roots extending below the 8-cm depth were nevertheless necessary o supply nutrients to the plant. Yield data suggest that O2 was low in a portion of the root zone where water tables were less than 76 cm below the surface.

Two days of flooding 4 weeks before the First harvest reduced the first harvest yield 40%, but did not affect the second harvest yield. Flooding at earlier or later dates caused less yield reduction.

Key Words: Drainage • Aeration

1 Joint contribution from the Southern Branch, Soil and Water Conservation Research Division, ARS, USDA, and the Department of Biological and Agricultural Engineering, North Carolina State University. Paper number 2712 ofthe Journal Series of the North Carolina State University Agricultural Experiment Station. Presented before Div. S-1, S-6 and A-3, Soil Science Society of America, Stillwater, Okla., Aug. 24, 1966.

2 Research Plant Physiologist, Research Soil Scientist, and Agricultural Research Technician, respectively, U. S. Department of Agriculture, Raleigh, N. C. 27607.

Received for publication August 29, 1968.




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The SCI Journals Crop Science Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1969 by the American Society of Agronomy.