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Field tests were conducted for 4 years on established smartweed flats (Polygonum hydropiperiodes) to determine if seed yields could be increased by fertilization. Maximum seed yields were obtained with high N fertilization (100 pounds of N per acre) and with a high application of complete fertilizer (100 pounds N, 100 pounds P2O5 and 100 pounds K2O per acre). Although seed yields were increased by fertilization, the total N and crude protein percentages of the seeds and of the tops were not greatly affected. Apparently, the N applied resulted primarily in increased seed and top production rather than in increased percentage of N. The cost of producing an extra pound of seed on the high N treatment ranged from 30 to 65 cents per pound. The cost per pound in the high application of fertilizer ranged from $0.65 to $1.03 a pound. From the viewpoint of management and of the economics involved, the use of 600 pounds of 5-10-10 fertilizer per acre may be the most reasonable practice.
The Journal of Wildlife Management © 1972 Wiley