In this chapter:
(1) "Agricultural chemical" includes fertilizer material as defined under Section 63.001, pesticides as defined under Section 76.001, plant regulators as defined under Section 76.001, lime, plant and soil amendments, plant food, herbicides, and chemical compounds that are applied to crops or to land used for growing crops.
(2) "Agricultural seed" has the meaning assigned under Section 61.001.
(3) "Labor" means labor or services performed in the application, delivery, or preparation of an agricultural chemical or agricultural seed.
(4) "Reasonable or agreed charges" means:
(A) any agreed price for agricultural chemicals, agricultural seeds, or labor sold or provided to a lien debtor at the lien debtor's request; or
(B) the reasonable value of agricultural chemicals, agricultural seeds, or labor, as of the date of application, delivery, or preparation, if there is not an agreed price or an agreed method for determining price.