1. Secondary tillage tool effect on soil aggregation;Adam;Transactions of the ASAE,1992
2. Consider the Strip-tillage Alternative;Al-Kaisi,2002
3. Anon., 2004. Irrigation and Tillage Information Exchange Report. Irrigation and Tillage Information Exchange Workshop, December, 16, Hooks Hanner Environmental Resource Center in Dawson, GA. http://www.tifton.uga.edu/sewrl/poster/IrrigationAndTillage InformationExchangeReportUSDAARS_V2.pdf.
4. Anon., 2011. Turkish State Meteorological Service. http://www.dmi.gov.tr/veridegerlendirme/il-ve-ilceler-istatistik.aspx?m=ERZURUM.
5. S313.2: Soil Cone Penetrometer;ASAE Standards,1993