Effect of 2,4-D on the yield and height of federation wheat
1948
McNeal, F.H.
Three spray and three dust formulations of 2,4-D and one spray application of methoxone were applied to fall-sown Federation wheat on April 15, 1947, when the plants were about 6 inches high. These plots contained about 42 mustard plants and 23 tarweed plants per square rod. There were six replications of each treatment in square rod plots with alternate check plots part of which were weeded by hand. Hand weeding increased the yield 3 bushels per acre. All chemical treatments reduced the yield of wheat as compared with the weeded plots, indicating some injury to the wheat. All differences except for the sodium salt spray are statistically significant at the 5% level. Also, all treatments reduced the yield of wheat below the average of the unweeded checks, but only the methyl ester and acid sprays produced statistically significant differences. The spray treatments reduced the plant height somewhat and tended to be more injurious than were the corresponding dusts. The test weight per bushel of wheat was not materially affected by any treatment.
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