For your example to be trivially valid, the farmer would need to be entitled to the sun, but the sun is not property of aynone as of yet. There might be an argument to this (especially if more context is given), but, in this general case, I find it unlikely.
Still, even we accept your example as valid, what would be the equivalent to "sunlight"? Labor, maybe? But labor isn't something that is owned nor it's a persistent property of material resources, it's human-derived transformation. It's inconcrete by itself, even more so than light, more akin to work (in the technical physics sense). It just so happens that it "produces" a material outcome.
For your example to be trivially valid, the farmer would need to be entitled to the sun, but the sun is not property of aynone as of yet. There might be an argument to this (especially if more context is given), but, in this general case, I find it unlikely.
Still, even we accept your example as valid, what would be the equivalent to "sunlight"? Labor, maybe? But labor isn't something that is owned nor it's a persistent property of material resources, it's human-derived transformation. It's inconcrete by itself, even more so than light, more akin to work (in the technical physics sense). It just so happens that it "produces" a material outcome.