Tex. Tax Code § 23.523
(a) The eligibility of land for appraisal under this subchapter does not end because the land ceases to be devoted principally to agricultural use to the degree of intensity generally accepted in the area if the owner of the land:
(b) The owner of land to which this section applies must notify the appraisal office in writing not later than the 30th day after the date the owner is deployed or stationed outside this state that the owner:
Added by Acts 2017, 85th Leg., R.S., Ch. 83 (H.B. 777), Sec. 1, eff. May 23, 2017.