Two N rate, time of application and plant density experiments were conducted
at Grand Rapids during 1974. Forty pounds of N per acre applied
prior to seeding produced the highest yield. There was no advantage of
using higher N rates or top dress applications. Total uptake of N by
the plant was related to the rates used. This would indicate that wild
rice can obtain fertilizer N from mineral paddy soils quite readily.
Highest yields were obtained with plant densities of 5 or 10 plants
per square foot. While low density plants produced 12 tillers each.
less than 2 tillers per plant were found at the highest density.
Nitrogen fertilization had little effect on tillering . Lodging appeared
to be more severe on high density plots receiving 120 lb/Acre N.
Two experiments were conducted on commercial paddies in Aitkin county
to study N and K effects on disease. The least diseased and lodged
plants were found on plots receiving 200 1 b/Acre of K20 combined with
Oar 40 lb/Acre of N. These beneficial effects of high potassium
rate were nullified on peat, however, by the application of 120 lb/Acre
of nitrogen. Grain yields were not related to fertilizer treatments.
Fertilization had no effect on N and K concentration of 2nd leaf at
Sincere appreciation is expressed for materials and/or financial
ass i stance or program support from several organizations including :
Potash Institute of North America ; Farmers Union Central Exchange ;
Farmland; Midland Cooperatives and Howe Incorporated; Minnesota
Cr op Improvement Association; National and State Soybean Associations;
Minnesota Golf Course Superintendents Association; Minnesota Limestone
Produce r s Association; U.S. Gypsum Corporation ; Minnesota Plant
Food Association; Minnesota Soil and Water Conservation Commission;
The Minnesota Resources Commission; The Minnesota State Planning
Agency; The Water Resources Research Center of the Graduate School ;
The Staples Vo-tech Institute; The Red River Valley Potato and Sugar
Beet Growers Associations; J. L. Shiely Company; The Tennessee Valley
Authority and The North Central Forest Experiment Station.
Department of Soil Science, University of Minnesota.
A Report on Field Research in Soils.
Regents of the University of Minnesota.
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