Effect of intercropping patterns and nitrogen fertilization levels on yield and yield components of maize and soybean

A field experiments was carried out at Sers El-Lian Agriculture Research Station Monofiya Governorate during summer seasons 2010 and 2011 to study the effect of nitrogen fertilizer levels and intercropping patterns on yield and yield attributes of maize with soybean intercropping. A split-plot design  was used the main plot contains three nitrogen fertilizer were 90, 105 and 120 kg N/fad. and the sub plot include three intercropping patterns (P₁) (100% maize + 25% soybean), (P₂) (100% maize + 50% soybean) and (P₃) (100% maize + 75% soybean) with three replications.
 
The results could be summarized as follows:
Grain yield/fad. of maize increased by increasing nitrogen fertilizer levels, while decreased by increased  plant density of soybean from 25% to 75%. Seed yield/fad. of soybean increased by increasing nitrogen fertilizer levels and plant density from 25% to 75% of solid.
The highest of land equivalent ratio (LER) gave 1.56 and 1.57 and land equivalent coefficient (LEC) produced 0.60 and 0.61 when observed intercropping pattern (100% maize+ 75% soybean) and nitrogen fertilizer level 120 kg N/fad. in the first and the second seasons, respectively. The aggressivity (Agg) of soybean was dominant while maize was dominated. The highest of competition ratio (CR) was soybean while lowest of (CR) was maize. The highest values monetary advantage index (MAI) were 2549.15 and 3088.71 and monetary equivalent ratio (MAR) were 1.23 and 1.37 when intercropping pattern (100% maize + 25% soybean) and nitrogen fertilizer level 120 kg N/fad. in the first and the second seasons, respectively.