of this subsection, subsections (a) and (c) shall not apply and domestic research or experimental expenditures shall be chargeable to capital account. Such election shall not apply to any expenditure paid or incurred during any taxable year before the taxable year for which the taxpayer makes the election and may be made with respect to part of the expenditures paid or incurred during any taxable year only with the approval of the Secretary. (e) Special rules (1) Land and other property This section shall not apply to any expenditure for the acquisition or improvement of land, or for the acquisition or improvement of property to be used in connection with the research or experimentation and of a character which is subject to the allowance under section 167 (relating to allowance for depreciation, etc.) or section 611 (relating to allowance for depletion)