¶ To be used after the General Thanksgiving, or, when that is not said, before the final Prayer of Blessing or the Benediction.

A Thanksgiving to Almighty God for the Fruits of the Earth
and all the other Blessings of his merciful Providence.

MOST gracious God, by whose knowledge the depths are broken up, and the clouds drop down the dew; We yield thee unfeigned thanks and praise for the return of seed-time and harvest, for the increase of the ground and the gathering in of the fruits thereof, and for all the other blessings of thy merciful providence bestowed upon this nation and people. And, we beseech thee, give us a just sense of these great mercies; such as may appear in our lives by an humble, holy, and obedient walking before thee all our days; through Jesus Christ our Lord, to whom, with thee and the Holy Ghost, be all glory and honour, world without end. Amen.

For Plenty.

O MOST merciful Father, who of thy gracious goodness hast heard the devout prayers of. thy Church, and turned our dearth and scarcity into plenty; We give thee humble thanks for this thy special bounty; beseeching thee to continue thy loving-kindness unto us, that our land may yield us her fruits of increase, to thy glory and our comfort; through Jesus Christ our Lord. Amen.

For a Safe Return from a Journey.

MOST gracious Lord, whose mercy is over all thy works; We praise thy holy Name that thou hast been pleased to conduct in safety, through the perils of the great deep, [his way,] this thy servant, who now desireth to return his thanks unto thee in thy holy Church. May he be duly sensible of thy merciful providence towards him, and ever express his thankfulness by a holy trust in thee, and obedience to thy laws; through Jesus Christ our Lord. Amen.

These prayers come from the 1928 Book of Common Prayer.
[HT: James Grant]