Fertilizer placement for rice: Ammonium-form nitrogen drilled into seedbed before flooding increased rice yields 25% to 50% in placement experiments

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research article

Fertilizer placement for rice: Ammonium-form nitrogen drilled into seedbed before flooding increased rice yields 25% to 50% in placement experiments

authors

D. S. Mikkelsen, University of California
D. C. Finfrock, University of California

publication information

California Agriculture 11(7):7-15. DOI: 10.3733/ca.v011n07p7. July 1957.

abstract

Abstract Not Available – First paragraph follows:

Ammonium-form fertilizers have special significance in the production of the California rice crop because ammonium nitrogen is the only inorganic form that can be maintained in continuously flooded soils. However, the maintenance of ammonium nitrogen is dependent upon proper fertilizer placement. When ammonium nitrogen is placed at a depth of 2″-4″ in a rice seedbed prior to flooding, its maximum utilization for increased rice yields is realized. Nitrogen which is converted to nitrate nitrogen before or after flooding will be denitrified and lost from the soil as nitrogen gas.

author affiliations

D. S. Mikkelsen is Assistant Professor of Agronomy, University of California, Davis. D. C. Finfrock is Associate Specialist in Agronomy, Biggs Rice Experiment Station, University of California.

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