Cal. Food & Agric. Code § 52852

The Legislature also declares that the restriction of the use to which cotton lands and cotton gins may be used, as provided in this chapter, is essential to the highest development of the cotton-growing industry; otherwise the different types of seed will be mixed, crossing will take place in the field, the varieties will be mongrelized and cease to be uniform, the fiber will deteriorate in quality, and the seed will be rendered unfit for planting.