الفهرس 
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Abstract
Two field experiments were carried out on a highly calcareous sandy clay loam soil at Nubaria Agricultural Research Station which is located at 47 km Alexandria- Cairo desert road (47 km south west of Alexandria city) representing the newly reclaimed land of north west of Egypt, during the two successive seasons of 2008 and 2009. The study was suggested to evaluate the effect of organic (Farmyard manure, FYM) fertilizer level and mineral- bio- fertilization and their interaction on NPK concentration in cotton leaves, growth, earliness, yield and yield components and fiber properties. The cultivar used, in the present investigation, the commercial Egyptian long staple cultivar; Giza 86. Three farmyard manure (FYM) fertilizer levels were applied as follows: A1: zero m3 FYM, A2: 10 m3 FYM and A3. 20 m3 FYM per feddan. Eight mineral- and bio- fertilization treatments were applied as follows:
B1. The full recommended doses of NPK.
B2. ½ NPK + Microbein bio- fertilizer.
B3. ½ NPK + Mycorrhizae bio- fertilizer.
B4.½ NPK + Potassiomage bio- fertilizer.
B5. ½ NPK + Microbein and Mycorrhizae bio- fertilizers.
B6. ½ NPK + Microbein and Potassiomage bio- fertilizers.
B7.½ NPK + Mycorrhizae and Potassiomage bio- fertilizers.
B8- ½ NPK + Microbein ,Mycorrhizae and Potassiomage bio -fertilizers.
The recommended doses of NPK in calcareous soil normally (75 kg N, 31 kg P2O5 and 48 kg K2O / feddan). The half amount of the recommended doses of NPK, i.e., (37.5 kg N, 15.5 kg P2O5 and 24 kg K2O/ feddan).
A split- plot design with four replicates was used with FYM (A) as main plot. The eight mineral- bio- fertilization treatments (B) occupied the sub- main plot. The most important results could be summorized as follows:
A. The Primary Nutrients (NPK) Concentration in Cotton Plant Leaves:
1. Main effects:
Nitrogen (N) concentrate in cotton leaves was significantly affected with applying farmyard manure (FYM) fertilizer levels only in 2008 seasons, but significantly affected by application of mineral- bio- fertilization in both seasons.
The results showed that phosphorus (P) concentrate in cotton leaves was affected by organic (FYM) fertilizer levels in 2008 and 2009 seasons. Also, Phosphorus concentrate was significantly affected by mineral- bio- fertilization in both seasons.
Farm yard manure fertilizer level of 20 m3 FYM / fed. gave the highest potassium (K) concentrate in cotton plant leaves (2.98, 3.13%) in 2008 and 2009 seasons, respectively. Inoculation cotton seeds with Microbein and Potassiomage bio- fertilizers when conjugated with the half amount of the recommended doses of NPK, also gave the highest potassium concentrate in the two growing seasons.
2. Interactions:
• Application of 20 m3 FYM/ fed. (A3) with full amount of the recommended doses NPK (B1) gave the highest N concentrate in both seasons. While using Microbein and Potassiomage bio-fertilizers with the half amount of the recommended doses of NPK with application of 20 m3 FYM/ fed. gave the highest concentration of potassium in cotton leaves in both seasons. On the other hand, application of 20 m3 FYM / fed organic manure with half the amount of the recommended doses of NPK with Microbein and Mycorrhizae gave the highest phosphorus concentrate in cotton plant leaves only in 2008 season.
B. Plant Growth Attributes:
1. Main effects:
Plant height at harvest (PH) was significantly increased with applying farmyard manure (FYM) fertilizer levels only in the first season but significantly affected by application of mineral- bio- fertilization in both seasons.