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Abstract Two field experiments were conducted using wheat plant (Triticum aestivum) Giza 168 variety during 2008 / 2009 season and Zea mays plant (single cross 10) at the Agricultural Experiment Station Fac. of Agric., Mansoura Univ., to study the influence of combined use of organic and inorganic fertilizers on productivity of either Wheat or Maize, availability of nutrients and monitoring the status of soil organic matter (Soil-O.M) in soil through different stages of wheat and Maize growth. The plot field area was 1x1 m2 which represent the treatment each treatment replicated three times. The experimental design was randomize complete blocks design. The mineral fertilizer (urea) was applied at the rate of N1=60 and N2=120 kg N fed-1.The amounts of various organic fertilizers used were (10 and 20 m3 fed-1), for both FYM and CRS. Organic fertilizers added either alone or in combinations with urea to the soil for wheat, while maize, The mineral fertilizer (urea) was applied at the rate of N1=100 and N2=200 kg N fed-1.The amounts of various organic fertilizers used were (10 and 20 m3 fed-1), for both FYM and CRS. Organic fertilizers added either alone or in combinations with urea to the soil. Results indicated that the maximum increase in wheat grain yield and straw yield were recorded with N2FYM2 and N2CRS2 respectively, and maximum increase in 100 grain weight of corn, grain yield and straw yield were recorded with N2CRS2. Therefore, it could be concluded that the integration of organic and inorganic fertilizers was better than inorganic fertilizer only. where using the high amount of organic fertilizers with urea gave the highest wheat and corn yield and increased the soil storing of (Soil-O.M) and accordingly raising the soil fertility. |