chownah wrote: Certainly it is possible to grow produce without animal manures but it is a much more difficult thing to accomplish and substantially increases the labor required. I think that unless one grows one's own produce one is unlikely to find produce which is grown without animal manures. I may be wrong on this as I have not contacted any organic growers anywhere but I have been an organic grower myself for many decades and have seen how ubiquitous the use of animal manure is in organic growing. It is true that some (perhaps most) organic field crops can be grown effectively using green manuring....things like grains mostly....but when it comes to growing vegetables where a much richer soil is needed it takes a lot of work to cut a green manure crop and then concentrate it into a smaller area to develop the richness of the soil.
Again, I have not done a survey of organic produce available commercially. It would be interesting if people in the USA who know of any organic growers if they use animal manures or not.
Bottom line for vegans perhaps is should you eat organic if it was grown with animal manure or would it be better for vegans who are not sure to stick with chemically grown produce?
Yes, apparently there is a way to grow without using manure, but not sure how widespread that use is. You make a good point that vegans who like to use no animals or animal by-products may actually be using some with the way their vegetables are grown. I know they don't like to use leather, eggs, cosmetics tested on animals, other products containing animal by-products, so I wonder how many of them realize that their vegetables are grown with manure?
In a (theoretical) lacto-ovo vegetarian world, there would be no issue as long as cheese and dairy product consumption remained as it is now, there would be plenty of manure from the dairy cows. For a (theoretical) vegan world, there might be a problem or crops could be grown without manure but I assume the cost would be much higher.