PHOSPHORUS AND POTASSIUM FERTILIZATION EFFECT ON TWO COTTON CULTIVARS YIELD AND SOIL AVAILABITLITY OF PHOSPHORUS AND POTASSIUM | ||
| Journal of Soil Sciences and Agricultural Engineering | ||
| Article 19, Volume 34, Issue 5, May 2009, Pages 5739-5751 PDF (660.38 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jssae.2009.93128 | ||
| Authors | ||
| Asmaa A. El- Bassuony; A. A. E. Atwa; H. S. Hamouda | ||
| Soils, Water, and Environment Research Institute, ARC, Giza, Egypt | ||
| Abstract | ||
| Two field experiments were conducted during two the successive summer seasons (2007 and 2008) at the experimental farm of Sakha Agric. Res. station, Kafer El- Sheikh Governorate. The aim of this study was to investigate the effect of phosphorus fertilization levels (0, 22.5, and 45 Kg P2O5/ fad for P0 (control), P1, and P2) and potassium fertilizer levels ( 0 and 50 K2O / fad for K0 and K1, respectively) on yield of two cotton cultivars; Giza 86 (CV1) and Giza 88 (CV2) and the soil availability of phosphorus and potassium during cropping seasons. The experiments were conducted in split- split plot design where cotton cultivars as main plots, phosphorus fertilizer levels arranged as sub plot and potassium fertilization levels as sub– sub plot, with three replicates. The obtained results can be summarized as following: the yield of cotton was significantly affected by cultivars and fertilization levels of P and K. Giza 88 attained higher yield compared to Giza 86. Application of P1 treatment produced significant higher yield (26.0 and 24.8% in the two season respectively) than that of P0 (control) treatment. there were about 6.8 and 7.6% increase in cotton yield in crop fertilized with P2 compared to that with P1 treatment. Cotton yield was significantly increased by 13.3 and 12.5% in 2007 and 2008 seasons, respectively with K1 treatment compared with control treatment (K0). The maximum mean value of cotton yield were 11.7 and 11.5 Kentar/fad in 2007 and 2008 seasons were obtained with K1 under P1 and P2treatments, respectively for Giza 88 varity. Application of P1 increased the available P by 38, 45, and 37.7% in 2007 and 2008 seasons, respectively. Available P is declined with P0, P1, and P2 treatments as function of the growth stage of cotton. The maximum mean value of available P (28.3 mg/ Kg soil) was obtained by application of K0 under P2 for CV1 in April 2007 and 2008 seasons. the minimum mean values (8.0 and 7.5 mg/ Kg soil in September 2007 and 2008 seasons, respectively) were obtained by application of K0 and K1 under P0 for CV2 and CV1 , respectively. Application of K1 increased available K by (10.84 and 10.81% than that of K0 (control) in 2007 and 2008 seasons, respectively. The equilibrium of available K in the soil solution was re-established during cropping time. | ||
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