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In order to investigate of density effect on advanced lines yield and some agronomical characteristics in second cropping ,a factorial experiment as base of RCBD was conducted in the research agriculture center in Sarab Changai, Lorestan province. Four line including of Hamilton x Essex18-T.N.5-95 x Hack Hamilton x Essex17-T.N.5-95 x Hack 12, three density levels as 40 ,50,60 plants in square meter were used in each plots. Some characteristics as yield, thousand seed weight, oil and protein percent were evaluated in the experiment. The results indicated that cultivar and density had significant(p 0.01) differences in height, seed weight and yield.comparison of line levels showed that The highest yield was produced by T.N.5-95 & Hack 12 (2739 kg/ha). comparison of density levels showed that the highest yield (2683 kg/ha )was produced when 40 plant planted in squar meters. Interaction of line x density was significant in yield. Comparison of means indicated tha Hamilon x Essex17 was superior than others when the density was 40 plants in square meter (3093 kg/ha). the highest seed weigh produced in T.N.5-95x Hack4 in 40 plants in square meter. Key word s: soybean variety ,density, second cropping

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سویاها ، ارقام ، فاصله گذاری ، عملکرد زراعی ، ویژگی های زراعی