الفهرس 
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Abstract
A pot experiment was conducted in a clayey soil (vertic xerofluvents) at the Experimental Farm of the Faculty of Agriculture, Mansoura University, Egypt (30.04 N latitude and 31.35 E longitude) during the winter seasons of 2015/2016 and 2016/2017 to study the Interaction between organic , phosphorus and potassium fertilizers and its impacts on plant growth and nutrient contents. Twenty seven treatments were arranged in a split-split block design with three replicates as follow; Three sources of organic manure (control, rice straw compost and chicken manure as main plot).Three rates of phosphorus fertilization (0, 50 and 100% from R.D as sub plot).Three rates of potassium fertilization (0, 50 and 100% from R.D as sub sub plot).Thus, the total number of the experimental pots was 81. The results could be summarized as follows: Vegetative growth parameters of wheat plant (fresh weight ”g pot-1 ”, dry weight ”g pot-1”, plant length ”cm”) The highest values were produced under the treatment of rice straw compost .Phosphorus fertilization affected the mean values of fresh weight, dry weight and plant height .The average values were significantly increased as a result of P fertilization. The highest increase was recorded under the addition of 100% from the recommended dose of Calcium-super phosphate.Data also illustrated that; addition of potassium fertilization to wheat plant tended to increase the mean values of all vegetative growth parameters over those obtained for all treatments under study than those obtained for the untreated plants and recorded the highest values with using 100% K-fertilization.The same trend was happened in the 2nd season and the differences between these values were significant for all vegetative growth parameters of wheat.The interaction effect between organic manures and both mineral fertilizers was indicated that; the average values of all growth parameters studied were significantly affected due to the addition of all investigated treatments. Such effect was more pronounced for the treatment of compost rice straw with 100% P-fertilization and 100% K-fertilization studied, comparing with the control treatment. Yield and its components of wheat plant. the highest values were obtained for the treatment of 100% P-fertilization, while the lowest one were recorded for the untreated plants for No. of grains per spike, spike length (cm) and weight of 1000 grains (g) as well as grain and straw yield (g pot-1); respectively. It could be noticed that the addition of potassium fertilization investigated was reflected on the mean values of yield and its components of wheat plants, which recorded the highest values for the plants treated with the rate of 100% P-fertilization, while the lowest one was realized for the untreated plants.The result revealed that K level had significant effect on yield and its components of wheat in 100% K might be due to the balanced accumulation of different nutrient elements in the grain resulting higher grain weight.The average values were also significantly increased as a result of the interaction between organic fertilization and adding phosphorus and potassium levels. The highest values of yield and its components were connected with the plants treated with rice straw compost + 100% from P and K fertilization. Such effect for the same treatment was true during both seasons of the experiments. Chemical constituents of wheat plant. N, P and K content after 60 day: The different comparison between the mean values of N, P and K (%) during growth parameters stage as affected by the combination between organic manure and both mineral fertilization under investigation. It was clearly that; 100% from potassium and phosphorus fertilization in combination with organic manure has been recorded a stimulation effect on the average values of all the aforementioned traits. The same trend was happened in the 2nd season. N, P and K content after 90 day: The highest mean values for the previously mentioned traits were found to be associated with the addition of 100% phosphorus for N, P and K contents.Using potassium fertilization was superior for increasing the mean values of the nutritional elements in wheat than those obtained from the untreated plants. The highest values were recorded at the addition of 100% from K-fertilization. The same was happened in the 2nd season.The mean values of N, P and K% in wheat plant tended to increase over the control treatment as a result of the interaction between the studied treatments. The highest values were connected with compost rice straw+ 100% P + 100% K. In addition, these mean values tended to increase than those obtained for the control treatment in the 1st season. The same was true in the 2nd season. Conclusion:- Fertilization of wheat plants with combinations of organic manure and mineral fertilizers, including P and K fertilizers, significantly increased all growth characters i.e., plant height, number of spikes plant-1, fresh and dry weights of. The enhanced growth characters were reflected in yield and yield components, mainly the increase in grains yield. This also could help in soil quality improvement, which should be investigated under field conditions.The use of 20 m3 fed-1 of rice straw compost as organic manure fertilizer with applying 100 % of phosphorus fertilizer + 100% of potassium fertilizer could be suggested to enhance growth parameters , the yield and its component , nutrient concentrations and uptake of wheat plants under the conditions of this experiment.