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Effects of Rate and Time of Potassium Application on Cotton Yield and Quality in Turkey
Author(s) -
Gormus O.
Publication year - 2002
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1046/j.1439-037x.2002.00583.x
Subject(s) - lint , potassium , gossypium hirsutum , yield (engineering) , human fertilization , fiber crop , gossypium , zoology , potash , mathematics , horticulture , agronomy , biology , chemistry , materials science , organic chemistry , metallurgy
Studies were conducted at Adana, in the Çukurova region of southern Turkey, to evaluate the effects of the rate and timing of application of soil‐applied potassium (K) on cotton ( Gossypium hirsutum L.) in 1999 and 2000. Potassium rates of 0, 80, 160 and 240 kg K 2 O ha −1 were soil‐applied in single treatments (all at early boll development) or in split treatments (1/2 at first square and 1/2 at first white flower; 1/4 at first square, 1/4 at first white flower and 1/2 at early boll development). Data collected in the two years indicated that application of 160 kg K 2 O ha −1 produced significant differences in seed‐cotton yield, lint yield and boll weight compared with the untreated control. The best combination producing the greatest yield was application of 160 kg K 2 O ha −1 with all of the K soil‐applied at early boll development. Cotton yields did not respond to K fertilization above the rate of 160 kg K 2 O ha −1 under the production practices typically found in the region. For application of K at a rate of 240 kg K 2 O ha −1 there was a marked difference in fibre strength between years in this study, but micronaire and uniformity ratio were not different amongst K rates within each year. When the total amount of K was applied at early boll development, higher yields, boll weights and lint turnouts were obtained compared with split applications, but the single application did not have a large impact on fibre properties.