Abstract
Agriform 20-10-5 slow-release and urea fertilizers were used on highly flocculent lake sediments to determine if they would produce commercial yields of wild rice. A small pilot study demonstrated that these fertilizers stimulated wild rice growth, but the results were highly variable because of small plot size and low plant density. Individual yield components generally showed a trend towards increasing production with increasing fertilizer application rate. The rate of maturation of the plant increased with fertilization and may account for some of the variability observed. A model of individual plant response to fertilization was developed using the yield component data of the pilot-scale study. This was incorporated into an econometric model to determine the profit-optimizing fertilizer application rate for whole-lake fertilization. Subsequent fertilization of the experimental lake demonstrated that fertilization of flocculent sediments can result in the production of a commercial crop. Differential effects of fertilization on yield components are discussed and suggestions made for more efficient applications.
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