(a) When no written contract is made under this chapter, the employer shall have a lien upon that portion of the crop going to the employee for any debt incident to making and gathering the crop owing to the employer by the employee without any necessity for recording any contract of writing giving the lien.
(b)
(1) In such case, no mortgage or conveyance of any part of the crop made by the person cultivating the land of another shall have validity unless made with the consent of the employer or owner of the land or crop, and the consent must be endorsed upon the mortgage or conveyance.
(2) However, no endorsement shall bind the party making it to pay the debt unless expressly so stipulated.