ارزيابي و مقايسه ي روش هاي مختلف آماده سازي زمين جهت كاشت ذرت از نظر اجزاء عملكرد ي در منطقه ي واوان استان تهران

The Evaluation and comparison of different methods of tillage for from the stand points of yield components in Vavan corn planting shire of Tehran province

Dearth of water content in soil. erosion of water and soil and destruction of soil structure are the major problems of shires of Iran. These are the results of perfect and strong plow of soil. In this study, tillage systems such as Conventional tillage. Reduced tillage and Minimum tillage compared and evaluated from the stand points of yield component (uniform surface and vertical seed distribution, percentage and velocity of emergence). Com Index and Field Capacity. The statistical design is Randomized Complete Block design with four replicates. Analysis of com index numbers in depth of 5 cm showed significant difference, so the maximum value of com index was for reduced tillage treatment and the minimum value was for the other treatments. Also. Analysis of com index numbers in depths of 10 & 20 cm showed significant difference at level of 1%. so the minimum value of com index was for conventional tillage treatment and the maximum value was for the other treatments. Analysis of the horizontal and vertical seed distribution and velocity of emergence factors, showed no significant difference. At the stand points of percentage of emergence, there was significant difference at level of 5%. so the maximum value was for minimum tillage treatment. At the stand points of required time of preparation of seed bed in hectare, minimum and maximum time were for minimum tillage treatment (4.5 hours) and conventional tillage treatment (7.5 hours), respectively. Accordingly, the most suitable of tillage system is minimum tillage system, because of excluding above analysis, it could be indicated to high traffic of conventional tillage system in farm!