الفهرس 
Effect of high population densities of some corn varieties on productivity of the intercropped corn and soybean
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Abstract
Two field experiments were conducted at the Agricultural Experiments and Research Station, Faculty of Agriculture, Cairo University, Giza Governorate, the first experiment was carried out in 2013 and 2014, the second one was carried out in 2014 and 2015 summer seasons, to evaluate effects of high plant population densities of three corn varieties on the productivity of intercropped soybean with corn and land usage under two intercropping systems.The soybean variety was Giza 111. Experiments included six cropping systems (two intercropping and four solid plantings), three corn varieties (synthetic Cairo 1, single cross 130 and single cross 128) and three corn plant densities (20000, 24000 and 30000 plants/fad). These populations were planted with distance between corn hills in 30, 25 and 20 cm in the first experiment but in the second experiment, the corresponding distances were 40, 50 and 60 cm with doubled the plants per hill than the experiment one.Intercropping systems were alternating two ridges of corn with two ridges of soybean, while mixed system, corn was planted on the middle of beds 140 cm width, but soybean was grown on both sides of the bed. Two corn plants of intercropping systems were grown per hill in first experiment and four plants in second experiment. Solid corn plants per hill were one, two and two plants in first experiment, as well as two, four and four for solid I, II and III, respectively