Two field experiments were carried out at El-Gemmeiza Agricultural Research Station, El-Gharbia Governorate during the two summer growing seasons, 2007 and 2008 to study the effect of nitrogen fertilizer rates, i.e., 15, 30 and 45 kg N/fed and foliar application of compost extract & humic acid on yield components, yield and chemical composition of rice plants and nitrate as well as nitrite content in drainage water at different stages from transplanting. Results can be summarized as follows:-Generally, high level of nitrogen fertilizer achieved significantly increases of rice yield and its components as well as N, p & K content of grain and straw compared with low rates in both growing seasons. While, in most cases, the same trend was recorded when second level of 30kg N/fed was practiced.Spraying humic acid or compost extract led to significant increases in most parameters of yield and its components as well as N, p & K content of grains and straw compared to no addition of such organic compounds in both seasons.In most cases, the interaction effect between the factors under study was insignificant on rice yield and its components as well as macronutrients content of grains and straw in both seasons.The high level of nitrogen fertilizer achieved significantly increases of nitrate and nitrite content in drainage water at different stages from transplanting compared to low rates in both stages of two growing seasons. On the other hand, such parameters weren't significant affected by foliar application of humic acid, compost extracts or the interaction between them and nitrogen levels in both seasons.

Two field experiments were carried out in two successive winter seasons of 2006/2007 and 2007/2008 to study the effect of bio-and mineral phosphorus fertilization on the yield and nutritional value of canola plant grown in calcareous soil at El -Areish Agricultural Research station, ) ARC) North Sinai Governorate. The main results were as the following:superphosphate and rock phosphate achieved a similar and insignificant effect on most measured yield characteristics, seed yield, N, P, K, oil, protein contents and oil yield in both growth seasons.Inoculation with either mycorrhiza or Bacillus megatherium alone or Bacillus megatherium + mycorrhiza were significantly resulted in actions on most canola tested parameters compared to the treatment of without inoculation. However, seed yield and P percentage did not respond significantly toward the inoculation with the investigated biofertilizers in first season.Generally the highest values obtained. for most characteristics of canola plants under investigation were achieved when the plants received rather rock phosphate or superphosphate mineral fertilizers together with mycorrhiza and/or Bacillus megatherium + mycorrhiza. While, there were insignificant differences due to their interaction on No. of branches / plant, seed yield and P percentage as well as canola plant height both in the first and second seasons.

Two field experiments were carried out at the experimental farm of Al-Arish Agricultural Research Station, Governorate of South Sinai, Agricultural Research Centre (ARC) in summer seasons of 2006 and 2007 to investigate the effectiveness of different rates of nitrogen fertilizer 60, 90, 120 kg/fed and ordinary super phosphate zero, 15, 30 kg P2O5/fed incorporated with 10 m 3 chicken manure/fed on yield of maize (Three Way Cross 324 cultivar) and its attributes under Al-Arish soil conditions. The results showed that application of chicken manure at the rate of 10 m 3 /fed had similar effect as application of 15 or 30 kg P2O5/fed together with 10 m 3 chicken manure/fed in kernel yield and its relevant attributes. Application of 15 kg P2O5/fed + 10 m 3 chicken manure/fed had significant effect on plant height and this combined rate was better than 30 kg P2O5/fed + 10 m 3 chicken manure/fed in kernel yield and its relevant attributes. The interaction of the two factors under investigation had insignificant effect on the agronomic parameters investigated in these two experiments. Increasing nitrogen rate from 60 to 90 kg/fed caused positive significant effect on N and P contents in kernels. Additional increase in N rate caused significant effect on P and K contents in kernels.