One of the coolest methods I found to produce organic fertilizer is to construct "pigeon towers". They're essentially structures that are built to be friendly for pigeons and birds to roost in. They funnel bird poop into areas which make it easy to collect and use as a natural, organic, fertilizer. In the world of hot start up concepts surely that idea has to count for something? In the old world, some civilizations were known for constructing massive pigeon towers, which appeared as giant stone monoliths, for purposes of simplifying the collection of bird waste.
Of course, there are many other methods. I'm certain there be no shortage of great ideas for producing organic fertilizers as ideas in this era are in abundant supply.
I think to collect bird dirt for too long because it may be calculated with how many birds that have a bird that is birds in the tower, if you have a lot of pigeons, it will quickly also get the dirt, but what if the opposite, why not use other animal dung such as cow dung , horses, goats, chicken and pigs, maybe others can also be added as an alternative to get organic fertilizer and to help farmers who lack fertilizer due to the high price of fertilizer.