الفهرس 
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Abstract
This study was carried out at the Agricultural Experimental Station of Soil and Water Department‚ Faculty of Agriculture‚ AL-Azhar University, Assiut, Egypt‚ which is located at 27o12\ N latitude and 310 09 / E longitude and at 51 m altitude. Aims of the present study were to investigate (1) evaluation of the application methods of phosphatic fertilizers, (2) The effect of farmyard manure (3) Combination between farmyard manure and phosphatic fertilizers on phosphorus availability, P use efficiency as well as on the biological and grain yields of corn.
The field experiment included three factors (farmyard manure, level of superphosphate and methods of application of phosphatic fertilizer). The farmyard manure treatments (0 and 30 m3/fed.) were assigned to the main plots, levels of superphosphate (15, 30 and 45 kg P2O5/fed.) were in the sub-plots and application methods of phosphatic fertilizer (broadcast, surface band and deep band) were in the sub sub plot. The additions of FYM and phosphatic fertilizer were under broadcast method were before cultivation, while, the additions of phosphatic fertilizer as surface banding and deep banding methods were after 20 days from cultivation. This experiment was cultivated in the summer seasons of 2014 and 2015 by corn (Zea mays L., cv Single Hybrid 10) and were sown at a level 10 kg/fed on May 5th in the both growth seasons.
Results of this study could be summarized in the following:
1. Available phosphorus
• Applying farmyard manure at 30 m3/fed enhanced phosphorus availability from 9.8 to 25.8 and from 10.7 to 29.1 mg kg-1 for first and the second seasons, respectively.
• The increase in phosphate fertilization levels from 100 kg/fed to 300kg/fed enhanced available P from 14.2 to 20.4 mg/kg at the first season and from 15.7 to 22.1 mg/kg at the second season.
• The results appeared that application of phosphate fertilizer as surface banding method gives the highest concentrations of available phosphorus in this soil after harvesting corn plants.
• Additions of superphosphate combined with farmyard manure improved the availability of phosphorus in soils during both seasons.
• Additions of superphosphate in surface banding method and 30 m3 /fed farmyard manure led to increase the available phosphorus from 10.9 mg/kg to 29.7 mg/kg in the first season. In the second season, phosphorus availability was improved from 11.8 mg/kg due to surface banding phosphorus without farmyard manure to 31.8 mg/kg with the same method of application and with 30 m3 farmyard manure.
• The combined application of farmyard manure, superphosphate level and methods of P application increased phosphorus availability from 6.8 to 33.3 mg/kg and from 8.3 to 36.4 mg/kg during the first and the second seasons respectively.
2. Biological and Grain yields
• The additions of 30 m3/fed. FYM improved the biological yield of corn from 9.2 to 12.4 ton/fed. in the first season and from 8.8 to 12.7 in the second seasons. Application 30 m3/fed of farmyard manure raised the grain yield of corn during the first season from 13.4 to 17.7 ardab/fed and from 13.9 to 19.7 ardab /fed in the second season.• Application of superphosphate caused an increase in the biological yield of corn plants from 10.5 ton/fed with 100 kg superphosphate to 11.2 ton/fed at 300 kg/fed superphosphate in the first season. In second season the biological yield of corn was increased from 10.4 ton /fed at 100 kg/fed superphosphate to 11 ton /fed duo to 300 kg/fed superphosphate. The grain yield of corn plants in the first season was enhanced from 14.7 ardab/fed with 100 kg/fed superphosphate to 16.6 ardab/fed with 200 kg/fed superphosphate, where, in the second season the grain yield was increased from 15.1 ardab/fed duo to 100 kg/fed superphosphate to 18.2 ardab/fed for 200 kg superphosphate• The addition of superphosphate as surface banding method increased the biological yield from 10.5 to 11.5 and from 10.3 to 11.5 ton/fed for the first and the second growth seasons, respectively, compared to.