The effects of different tillage methods on apparent density of soil and yield of forage corn

In order to determine the effects of different tillage methods on apparent density of soil and yield of forage corn¡ experiments were carried out on a land in Miandoab town from west Azarbaijan. The treatments include: moldboard plow and double disk¡ chisel plow and double disk¡ disk plow and double disk and cultivator with one disk. The results showed that different tillage methods have significant effects on apparent density during different measurement period (1 day¡ 15 days¡ and 30 days after tillage). Maximum apparent density related to cultivator treatment during 30 days after tillage with 2.18 g/cm3 and minimum apparent density related to disk plow treatment during one day with 1.69 g/cm3. By increasing time of measurement after tillage¡ the ration of apparent density increased 23%. In deeps of (0-5)¡ (5-10) and (10-15) cm of soil¡ variation of apparent density of soil was not significant. Effects of tillage methods on yield of forage corn by one percent probability were significant and maximum performance related to disk plow with 61.5 tons per hectare.