2In determining whether the management of land is such as aforesaid regard shall be had, but without prejudice to the generality of the provisions of the last foregoing paragraph, to the extent to which the owner is making regular muirburn in the interests of sheep stock, exercising systematic control of vermin on land not in the control of a tenant, and undertaking the eradication of bracken, whins and broom so far as is reasonably practicable, and to the extent to which the owner is fiilfilling his responsibilities in relation to the provision, improvement, replacement and renewal of the fixed equipment on the land in so far as is necessary to enable an occupier reasonably skilled in husbandry to maintain efficient production as aforesaid