Productivity of oil flax varieties depending on cultivation conditions (crop rotation, method of soil treatment) on leached chernozem of Northern Precaucasus

There was analyzed productivity of oil flax varieties VNIIMK 620 and VNIIMK 630 in special crop rotations with oil crops in stationary trail of VNIIMK during 2004-2008. It is established the method of main soil treatment influences insignificantly on productivity, and oil flax cultivation in five- and eight crop rotations allows to have stable crop yields up to 1.69 t ha-1 and oil yield more than 0.67 t ha-1.