Fertilizing constituents of cotton burs or cotton bur ashes and their effect on crop yields
1938
Harper, H.J. | Daniel, H.A. | Volk, G.W.
The effect of applying cotton burs and their ashes to Kirkland soil on the yield of seed cotton has been studied at Oklahoma Agricultural Experiment Station since 1926. Three tons of burs applied at intervals of 3 years, either plowed or disked into the soil, give as good returns as 6 tons on adjacent plats treated in a similar manner. The average increase was 189 pounds per acre when the lightest application was plowed under and 166 pounds when disked into the soil. The highest average gain from the heaviest treatment was 170 pounds of seed cotton per acre. Ashes from equivalent amounts of burs only produced about one-half as great an increase in yield as the burs. Cotton burs were collected from 22 counties in Oklahoma and analyzed for their fertilizing constituents. These samples contained an average of 8.73% ash, 1.04% nitrogen, 0.10% phosphorus, 0.65% calcium, 3.39% potassium, and 0.25% magnesium, calculated on a moisture-free basis. The nutrient content of cotton bur ashes was calculated, and the average quantity of different oxides was found to be as follows: Phosphoric acid (P2O5), 2.68%; calcium oxide, 10.41%; potassium oxide, 45.15%; and magnesium oxide, 4.76%.
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