ECONOMICAL EVALUATION OF COTTON RESPONSE TO THE COMBINED OR INDIVIDUAL APPLICATION OF PHOSPHORUS AND POTASSIUM FERTILIZERS | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 16, Volume 34, Issue 6, June 2009, Page 7211-7226 PDF (757.88 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2009.100747 | ||||
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| Authors | ||||
| A. A. Rahmou1; S. A. El. Ghounem2; S. F. El-Fiki1; H. W. A. Wahba1 | ||||
| 1Soils, Water and Environment Research Institute, Agric. Res. Cent. (ARC) Giza, Egypt | ||||
| 2Agricultural Economics Research Institute, Agric. Res. Cent. (ARC), Giza, Egypt | ||||
| Abstract | ||||
| Two field experiments were conducted at El-Serw Agricultural Research Station (ARC), Damietta Governorate during 2006 and 2007 growing seasons to evaluate economically the effect of phosphorus fertilizer levels (0, 15, 30 and 45 kg P2O5/fed), potassium fertilizer levels (0, 24, 48 and 72 kg K2O/fed) and their combinations as independent variables on some quantity and quality characters of cotton variety Giza 86 as dependent variables. The quantity characters were cotton seed yield (kg/fed), seed yield (kg/fed), lint yield (kg/fed.) and oil yield (kg/fed) and the quality characters were seed index (g), boll weight (g), number of open bolls/plant and nutrient concentrations (N, P and K %). Simple correlation, simple regression and stepwise regression analysis were used to detect different relationships included. The results obtained could be summarized as follows: 1- Quantity characters: A- Simple correlation 1- Results of simple correlation analysis indicated that the highest significant positive correlation of 2-tailed at 0.01 level was found between phosphorus fertilization and each of cotton seed, seed, lint and oil yields with r-values of 0.964, 0.966, 0.961, 0.979, respectively. 2- Significancy at 0.01 level and a positive correlation were found between potassium fertilization and each of cotton seed, seed, lint and oil yields with r-values of 0.964, 0.960, 0.929 and 0.969, , respectively. 3- Significancy at 1% level and a positive correlation were found between phosphorus x potassium fertilization and each of cotton seed, seed, lint and oil yields with r-values of 0.964, 0.606, 0.658 and 0.562, , respectively. 4- Also, the result of simple correlation analysis showed that the significant at 0.01 level and positive correlation was found between phosphorus and potassium as independent variables and cotton seed yield as dependent variable with r-values of 0.728 and 0.433, respectively. B- Simple regression analysis: 1- Result of simple regression analysis cleared that the relative contributions of (R-2) for P, K and PK fertilization as independent variables were accounted by 92%, 89% and 39% from the total variation of cotton seed yield as dependent variable successively, the relative fertilization contributions of (R-2) for P, K and PK fertilization were accounted by 93%, 91% and 35% from the total variation of seed yield , respectively, also the relative contributions of (R-2) for P, K and PK fertilization were accounted by 92%, 85% and 42% from the total variation of lint yield successively and the relative contributions of (R-2) for P, K and PK fertilization were accounted by 95%, 93% and 30% from the total variation of oil yield, respectively. C- Stepwise regression analysis: Result of stepwise regression analysis revealed that the P fertilization was the highest factor contributing to the total variation of cotton seed yield with R2 being 52.3%; on the other hand, the K fertilization was the second factor contributing to the total variation of cotton seed yield with R2 being 19.7%. 11- Quality characters: A- Simple correlation analysis: Result of simple correlation analysis indicated that the highest significant positive correlation (at 0.01 level) was found between P fertilization and each of seed index, boll weight and number of open bolls/plant with r-value of 0.988, 0.981 and 0.986, , respectively. A significant and a positive correlation were found between K fertilization and each of seed index, boll weight and number of open bolls/plant with r-value of 0.955, 0.933 and 0.949 successively. Significant and positive correlation was found between (P x K) fertilization and each of seed index, boll weight and number of open bolls/plant with r-value of 0.400, 0.363 and 0.646, respectively. Also, the result of simple correlation analysis indicated that the highest significant positive correlation (at 0.01 level) was found between P fertilization and each of N%, P%, and K% with r-value of 0.985, 0.972 and 0.979, respectively. A significant and a positive correlation (at 0.01 level) was found between K fertilization and each of N%, P% and K% with r value of 0.883, 0.998 and 0.996, successively. B- Simple regression analysis: Result of simple regression analysis cleared that the relative contribution of each of P, K and PK fertilization as independent variable were accounted by 98%, 90% and 32% from the total variation of seed index as dependent variable successively. The relative contribution of each of P, K and PK fertilization were accounted by 96%, 87% and 28% from the total variation of boll weight , respectively, and the relative contribution of each of P, K and PK fertilization were accounted by 97%, 89% and 41% from the total variation of number of open bolls/plant, successively. III- Economic evaluation Result of the study indicated that the highest productivity and the highest net revenue were accounted by 7.49 Kentar / fed and 2558 LE / fed successively of using 72 kg K2O/fed + 30kg P2O5/fed. | ||||
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