Soils of Egypt characterize with raising pH values, CaCO 3 content, clay and Fe & Al oxides. These factors contribute, to a large extent, in P-fixation in soil and its transformation into unavailable forms. This reflect, in turn, on plant growth and the resultant crop. So, the main target of this investigation is raising the use efficiency of P-fertilization, decreasing P-fixation, increasing its availability in soil and promoting its uptake by plant through testing new methods for P-application compared with the traditional one (P-application before sowing). Therefore, two field experiments were designed in sandy soils during the two winter seasons 2002/2003 and 2003/2004 at South Tahrir Res. Station, Ali Moubark village, El-Bustan region, Behira governorate under drip irrigation system. For the two experiments, P was applied as soil or seed coating. Soil application treatments were added at a rate of 30 kg P 2 O 5 /fed., once before sowing, twice: before sowing and during the vegetative growth stages or in three portions, before sowing and during the vegetative and flowering growth stages. In seed coating method, seed were coated before sowing with P at rates of 0.1, 0.2 and 0.3 kg P 2 O 5 /kg seed. Data obtained revealed that the treatments of P-soil application generally surpassed the P-seed coating ones. In this respect, P-soil application in three portions (at sowing and during the vegetative and flowering growth stages) gave the highest increments in seed, straw and seed protein yields as well as macro-and micronutrients contents in both seed and straw compared with the traditional method of soil P-application. Moreover, seed coated with 0.2 kg P 2 O 5 /kg seeds attained the highest increases in all abovementioned yield components and nutritive contents among the treatments of seed coating method, whereas, coating of seeds with 0.3 kg P 2 O 5 /kg seeds caused the least ones. Therefore, it can be concluded that the addition of P to sandy soil at a rate of 30 kg P 2 O 5 /fed., in three portions, i.e. at sowing and during the vegetative and flowering growth stages reduce Pfixation by soil factors, increase its availability, promote its uptake by plant, achieve the highest productivity of faba bean seed, straw and seed protein yields and improve the nutritive contents of both seeds and straw.
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...
A field experiment was conducted in a silty clay soil at Damas village, Mit Ghamr, Dakahlia using faba bean during 2007-2008 winter season to study the response of faba bean (Vicia faba L.) cv. Giza 3, to inoculation with Rhizobium leguminosarum bv. Viciae either solely or dually with Bacillus megatherium var. phosphaticum under three levels of phosphorus fertilizer (0, 15 and 30 kg P2O5 fed -1 ) on leaves chlorophyll content, nodulation, seed yield and its components and seed protein. Also on N, P and K content of seed and straw, available nitrogen and phosphorus in soil and numbers of phosphate dissolving bacteria in rhizosphere plant after 30, 60 and 90 days from sowing. Results revealed that the dual inoculation with Rhizobia and Bacillus gave significant increases in chlorophyll a and a + b, number of nodules/plant, dry weight of nodules/ plant and nitrogenase activity after 75 days from sowing. Yield and its components, seed protein % and seed protein content increased significantly by inoculation or increasing of phosphorus fertilizer rate or their combination where, the increase in seed yield and seed protein content recorded about 35 and 57%, respectively, over control (uninoculated treatment).Regarding N, P and K content in faba bean seed and straw, data showed significant increases as a result of increasing in P fertilizer or due to bacterial inoculation especially a dual inoculation. The soil available P and N increased significantly by either inoculation or P-fertilizer, in response to the use of 30 kg P2O5 fed -1 .Finally, results confirmed the necessity of dual inoculation with Rhizobia and Bacillus in combination with applying 30 kg P2O5 as P-fertilizer for faba bean growth and productivity and for improvement of soil fertility.
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