The response to fertilizers of soils of the Blackland Prairie section of Texas as determined by the triangle system
1940
Adams, J.E. | Jordan, H.V. | Jenkins, P.M.
The effects of fertilizers on the production of cotton are reported for 20 experiments on Houston black clay soil, 9 on Hunt clay, and 6 on Wilson clay loam. These are three of the cotton soils of the Blackland prairie section of Texas. The average yields of unfertilized plats were 604, 493, and 360 pounds of seed cotton per acre for the three soils, respectively. Using nine key ratios according to the triangle system, the maximum increase in yield, as an average of the three best fertilizers for each soil, was 115 pounds for the Houston, 129 for the Hunt, and 244 for the Wilson soil. The average analysis of the three best fertilizers was 10-3-2 for the Houston, 7-4-4 for the Hunt, and 5-6-4 for the Wilson soil. Additional information on the Wilson soil indicates that the potash content probably could be reduced somewhat for each of the soils. The study shows gradients in fertility and response to fertilizers as one changes from Houston to Hunt to Wilson soils. The triangle system has been particularly effective in obtaining orienting information concerning the fertilizer needs of the soils of the section. The Latin square and other approved field experimental designs have been used since 1935 to test the fertilizers indicated by the triangle experiments as of greatest importance for an understanding of the fertility of these soils. The data confirm those secured by the triangle system.
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