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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.