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The relation of fertilizers to the cotton plant produced in the Blackland prairie section of Texas
- Jordan, H.V., Hunter, J.H., Adams, J.E.
- Agronomy journal 1938 v.30 no.3 pp. 254-262
- height, plant characteristics, Gossypium hirsutum, crop yield, Phymatotrichopsis omnivora, NPK fertilizers, phosphates, nitrogen, clay soils, loam soils, bolls, plant development, disease control, plant diseases and disorders, root rot, Texas
- Cotton was grown on Wilson clay loam, Wilson fine and Houston black clay soils, using fertilizers of 0-15-0, 3-9-3, 9-3-3, and 15-0-0 analyses. Periodic records were made of the numbers of plants killed by root-rot, of the height, and numbers of squares a bolls. Under the conditions of the experiment, an analysis of variance for four fields located on the Wilson soil showed that the 15-0-0 and 9-3-3 fertilizers reduced the number of plants killed by root-rot and that the 0-15-0 increased the mortality by amounts of statistical importance. The 3-9-3 ratio may either increase or decrease the kill as shown by individual records, but a summation indicated an increase which was not of importance. Differences on the Houston soil were confined to the 0-15-0 and 3-9-3 ratios. For the first two dates of record the increases effected by the 0-15-0 were of importance, while that of the 3-9-3 occurred on the first date. Phosphate alone and the complete fertilizers accelerated the development of the plant when height and numbers of squares and bolls were considered as indices; during the earlier part of the season the increases are generally of statistical importance. On the Houston soil the effect is produced by the 3-9-3, 0-15-0, and 9-3-3 fertilizers. Nitrogen alone (15-0-0) only tends to delay development. A correlation of an acceleration of plant development and the incidence of root-rot is indicated for the 0-15-0 fertilizer. The variable relation of the complete ratios and the tendencies for the 15-0-0 ratio are discussed.