May they praise you because you rule with justice, because you make known your ways of salvation throughtout the world, because the land yields an abundant harvest and we are blest.
Is the psalmist considering just the current times and the grain harvest or is he/she looking forward to the end times and the final harvest of souls? Are the people urged to praise God for a past harvest, the current one, or the great harvest to come?
Or is it an if . . . then situation? If the people praise God, then God will bless them and the land will yield its harvest. If the people praise God, then all the ends of the earth will fear him (v7).
Any one of those interpretations is possible. Why don't we pray the Psalm and see where God leads us.