sun-baked 
adjective
(Especially of the ground) dry and hard from exposure to the sun’s heat: many of the swamps turn to hard sun-baked mud during the dry season [predicative]: the land north of Kuruda and Hessadi villages is uneven, dry, and sun-baked...
- The sun-baked ground crumbled against their feet as they walked.
- Pam Gems's magnificent adaptation of this poetic tragedy is a gift: soft, yet as hard as the sun-baked soil.
- In the swampy bottoms, water-lilies rose naked out of sun-baked mud.