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 rvalues 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. Rahmou, A. A. et al. 7212 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 R 2 being 52.3%; on the other hand, the K fertilization was the second factor contributing to the total variation of cotton seed yield with R 2 being 19.7%. 11-Qu...
Two field experiments were conducted at Mallawy Agricultural Research Station, Agric. Res. Center, El-Minia Governorate in summer seasons of 2006 and 2007 consecutively to study the effect of soil and foliar application of superphosphate and potassium sulfate on maize yield and its attributes and contents of N, P and K nutrients in ear leaf and kernels. Results indicated that foliar application of superphosphate at 10% concentration was significantly better than all other foliar applications involved in the current investigation in respect to kernel yield, ear length and ear diameter in the first season of ( 2006). Foliar application of potassium sulfate at 5% concentration was better than any other foliar application used in this investigation for producing kernel and ear yields in the second season of ( 2007). Foliar application of both superphosphate and potassium sulfate at 10% concentration gave the highest significant increase in N content in ear leaf and kernels in the second season of ( 2007).
Two field experiments were carried out at the experimental farm of Al-Arish Agricultural Research Station, Governorate of South Sinai, Agricultural Research Centre (ARC) in summer seasons of 2006 and 2007 to investigate the effectiveness of different rates of nitrogen fertilizer 60, 90, 120 kg/fed and ordinary super phosphate zero, 15, 30 kg P2O5/fed incorporated with 10 m 3 chicken manure/fed on yield of maize (Three Way Cross 324 cultivar) and its attributes under Al-Arish soil conditions. The results showed that application of chicken manure at the rate of 10 m 3 /fed had similar effect as application of 15 or 30 kg P2O5/fed together with 10 m 3 chicken manure/fed in kernel yield and its relevant attributes. Application of 15 kg P2O5/fed + 10 m 3 chicken manure/fed had significant effect on plant height and this combined rate was better than 30 kg P2O5/fed + 10 m 3 chicken manure/fed in kernel yield and its relevant attributes. The interaction of the two factors under investigation had insignificant effect on the agronomic parameters investigated in these two experiments. Increasing nitrogen rate from 60 to 90 kg/fed caused positive significant effect on N and P contents in kernels. Additional increase in N rate caused significant effect on P and K contents in kernels.
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