That would actually be a pretty difficult ask, you would have to cover the order of thousands of acers of land, spotty uplink service, supplying power or developing low power solution (also needs to be maintained by the farmers). Also, building a machine/implement to kill this or that plant would be pretty tough too. That's aside from the soil type and what kind of irrigation you're able to use.
It wasn't mentioned in the video, but you can get kinda close to what you're thinking today. When harvesting the crops it's possible create a map of the yield throughout the field. Then with combinations of random sampling of the soil throughout different parts of the field, one can adjust the fertilizer distribution thought the field. Finally, when you go to plant the crops next year, you can utilize this data to configure the planter to automatically space the plants a little closer or farther apart. Many farmers are already doing exactly this.
It wasn't mentioned in the video, but you can get kinda close to what you're thinking today. When harvesting the crops it's possible create a map of the yield throughout the field. Then with combinations of random sampling of the soil throughout different parts of the field, one can adjust the fertilizer distribution thought the field. Finally, when you go to plant the crops next year, you can utilize this data to configure the planter to automatically space the plants a little closer or farther apart. Many farmers are already doing exactly this.