Almassi M, Kiani S, Loveimi N (2001) Principles of agricultural mechanization. 2nd Reprinted Hazerat Masoomeh Pub. Guom. Iran. [In Persian with English Abstract].
Benjamin JG, Mikha MM, Merle FR (2008) Organic carbon effects on soil physical and hydraulic properties in a semi arid climate. Soil Science Society of America Journal 72: 1357-1362.
Bonari E, Mazzonicini M, Peruzzi A (1995) Effects of conventional and minimum tillage on winter oilseed rape. Soil and Tillage Research 33: 2. 91-108.
Chen YM, Monero FV , Lobb D, Tessier S, Cavers S (2004) Effect of six tillage methods on residue incorporation and crop performance in a heavy clay soil. ASAE Journal 47: 1003-1010.
Gholami-Parshekohi M, Hanifi M, Rashidi M (2011) The effects of different tillage methods on safflower yield and its components. The National Conference on New Achievement of Oil Plants. Bejnord Branch, Islamic Azad University, Iran. [In Persian with English Abatract].
Ghuman BS, Sur HS (2001) Tillage and residue management effects on soil properties in direct drill tillage system. Soil and Tillage Research 42: 209-219.
Griffith DR, Kladirko EJ, Mannering JV, West TD, Parsons TD (1988) Long term tillage and rotation effects on corn growth and yleld on high and low organic mater in poorly drained soils. Agronomy Journal 80: 599-605.
Haghnia GH (1995) Water penetration problems in soil. Ferdosi University of Meshhad Publication No. 183. [In Persian with English Abatract].
Harris PB (1982) Rape crop needs minimal amount of seedbed preparation. Arable-Farming 9 (9): 44-47.
Havlin PJ, Kissel DE, Madux LD, Classen MM, Long JH (1990) Crop rotation effect on soil organic carbon and nitrogen. Soil Science Society of America Journal 54: 448-452.
Heidari A (2004) The effect of crop residue management and tillage depth on wheat yield and soil organic carbon in corn-wheat rotation. Journal of Engineering Reseach 2(7): 65-79. [In Persian with English Abatract].
Hussain I, Olson KR, Ebelhar SA (1999) Long - term tillage effect on soil chemical properties and organic matter fractious. Soil Science Society of America Journal 63: 1335-1341.
Jacobs CO, Harrol WR (1983) Agricultural power and machinery. Mc Grow Hill Book Co. New York, USA.
Kosutic S, Filipovic D, Ivancan S (1995) Experience with different tillage methods in wheat, oilseed rape and maize production. Current problems in agricultural engineering.Proceeding: Aktualni Zadaci Mehanizacije Poljoprivrede. Zagreb 115-121.
Lal R, Mohboubi A, Fausey NR (1994) Long - term tillage effect on soil chemical properties of centeral Ohio soils. Soil Science Society of America Journal 58: 517-522.
Najafinezhad H, Rashidi N, Ravari SZ (2005) Effect of seedbed preparation methods on yield of grain maize and some soil properties in double cropping system. Journal of Seed and Plant 21: 315-330. [In Persian with English Abatract].
Naseri, F (1998) Oil seeds (translation). Astan Ghods Razavi. Publication. 213 pp. [In Persian with English Abatract].
Omidi H, Tahmasebi-servestani Z, Ghalavand A, Modarres- Sanavi SMA (2004) Evaluation of tillage systems and row distances on grain yield and oil content in two canola cultivars. Iranian Journal of Crop Sciences 7 (2): 97-111.
Paseban-Eslam B (1999) Sofflower. Azarbaijan Sharqi Agriculture Organization Press. [In Persian with English Abatract].
Raimbolt BA, Vyn TJ (1991) Crop rotation and tillage effects on corn growth and soil struractural stability. Agronomy Journal 83: 979-985.
Reshadsedghi A, Amirshagaghi F, Solhjo AA, Sadeghnajad, HR, Randjbar F, Saati M (2009) The effects of different tillage methods on soil physical properties and yield of canola in diferent regions of country. Journal of Agricultural Enginering 32(1): 69-86. [In Persian with English Abatract].
Solhjo AA, Niyazi J (2002) Effect of subsoiler on physical characteristics of soil and wheat yield. Journal of Agriculthural Engineering Research 7 (2): 65-78. [In Persian with English Abatract].
Vez A (1974) The chisel plough and its derivatives: new implements for soil cultivation. Review Suisse de Agriculture 6(4): 125-133.
Zumbach W (1982) Soil cultivation without ploughing. Technique Aricole (6): 253-260.