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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 K2O 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 K2O 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 K2O 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 K2O ha−1 under the production practices typically found in the region. For application of K at a rate of 240 kg K2O 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.

Oilseed crops are considered as one of the most essential dietary components in human consumption as well as animal feed. While drought is one of the most important abiotic stress that adversely effect on the yield and nutritional quality of major oilseed crops across the globe. Therefore, maintenance of nutritional quality in such crops under drought stress may offer good opportunities to

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Agronomic practices significantly influence the productivity and quality of cotton plant. Present study was undertaken to evaluate the effect of nitrogen and sulfur fertilizer application on the fiber quality of cotton, during the year 2011/2012 and 2012/2013 under Mediterranean environmental conditions. All the treatments were laid in randomized complete block design in factorial arrangement each treatment were replicated thrice. Five rates of nitrogen (0, 60, 120, 180 and 240 kg ha -1 ) and five rates of sulfur (0, 15, 30, 45 and 60 kg ha -1 ) were involved in the experiments. Results of study indicated that increases in the rate of sulfur have negative impact on the quality of the cotton fiber and the highest rate of sulfur fertilizer gave the lowest fiber length compared with the other sulfur rates. On the other hand, the lowest uniformity ratio was observed by applications of sulfur at 30, 45 or 60 kg ha -1 . It was observed that application of sulfur had no significant effect on micronaire and fiber strength. Further, application of 60 to 120 kg N ha -1 have positive effect on the fiber length and caused 2.7 to 3.4% improvement in fiber lengths in 2012 compared to the treatment without N, while applications of nitrogen at 180 and 240 kg ha -1 did not provide an additional increase in fiber lengths. Further, it was reported that application of N significantly improved fiber strength, but these differences were not statistically different from the

Effective management strategies for nitrogen (N) and potassium (K) fertilizer are important to ensure optimum yield and fiber quality of cotton production. The aim of this research was to study the influence of nitrogen and potassium application on yield and fiber quality of cotton. Study was conducted in a randomized blocks in a factorial design with three replicates. The nitrogen treatments (0, 60, 120, 180, 240 kg ha -1 ) and five K2O rates (0, 50, 100, 150, and 200 kg ha -1) are used in this study. Among the various tested combinations, the best combinations are 180 kg N ha -1 along with 150 kg K ha -1 and it produced the greatest seed cotton yieldand gin turnout. After 120 days of plantation 72% reduction in the dry weight was reported in the nitrogen deficient treatment and these plants produced only 17 bolls per plant and it was significantly different (25 bolls) than the plant treated by 180 kg N ha -1 . Significant and negative correlations were reported between boll number per plant and micronaire and total dry matter yield were found at K fertilization treatments. Positive and significant correlations were determined between gin turnout and micronaire and between fiber strength and total biomass production at N fertilization. The highest fiber strength was recorded in the plant treated by the combination of 240 kg ha -1 nitrogen and 50 kg ha -1 potassium. For fiber length and fiber strength, no significant differences were reported among the various treatments of potassium. From the results of this study it can be concluded that combination of 180 kg ha -1 nitrogen and 100 kg ha -1 potassium are suitable for the production of cotton crop.