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Published in Agron J 61:227-230 (1969)
© 1969 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Influences of Water Management and Fertility on Rice Growth and Yield1

E. A. Oelke and K. E. Mueller2

Several water-management systems for water-seeded rice (Oryza saliva L.), each with several nitrogen levels, were compared for 3 years as to their influence on growth and yield. A shallow (4 cm) water depth all season consistently gave higher yields than intermediate (8 cm), deep (18 cm), or fluctuating (4 cm and then 18 cm) water depths. Relative fertility and varietal responses were similar for all water-management systems. Daytime water temperature, tillers per plant, shoot dry weight, plant population, active leaf area per plant, panicles per plant, panicles per square meter, total nitrogen in the shoots at 30 days, and total nitrogen in the grain were greater in shallow water than in the other water-management systems. Seedling emergence and flowering were earlier in shallow water, but lodging was greater and total nitrogen in the straw was lower than in the other systems. The greater number of panicles per square meter was the yield component which contributed most significantly to the higher yields obtained with shallow water.

Key Words: Plant population • Dry weight accumulation • Leaf area • Nitrogen content • Yields components

1 Contribution from the Department of Agronomy, University of California, Davis

2 Formerly Assistant Agronomist (now Assistant Professor and Extension Agronomist, Dept. of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minn. 55105) and former Superintendent, Rice Experiment Station, Biggs, Calif. 95917.

Received for publication May 4, 1968.




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Copyright © 1969 by the American Society of Agronomy.