In order to keep upland cotton to the maximum extent practicable in the normal channels of trade, any additional price support under subsection (b) of this section may be carried out through the simultaneous purchase of cotton at the support price therefor under subsection (b) of this section and the sale of such cotton at the support price therefor under subsection (a) of this section or similar operations, including loans under which the cotton would be redeemable by payment of the amount for which the cotton would be redeemable if the loan thereon had been made at the support price for such cotton under subsection (a) of this section, or payments-in-kind through the issuance of certificates which the Commodity Credit Corporation shall redeem for cotton under regulations issued by the Secretary. If such additional support is provided through the issuance of payment-in-kind certificates, such certificates shall have a value per pound of cotton equal to the difference between the level of support established under subsection (a) of this section and the level of support established under subsection (b) of this section. The corporation may, under regulations prescribed by the Secretary, assist the producers and persons receiving payment-in-kind certificates under this section and section
1348 of this title, in the marketing of such certificates at such time and in such manner as the Secretary determines will best effectuate the purposes of the program authorized by this section and such section
1348. In the case of any certificate not presented for redemption within thirty days of the date of its issuance, reasonable costs of storage and other carrying charges as determined by the Secretary for the period beginning thirty days after its issuance and ending with the date of its presentation for redemption shall be deducted from the value of the certificate.