Timed rotational grazing is excellent for a grove. In a properly managed healthy organic farm system most excess nitrogen is captured along with other plant beneficial nutrients, hormones, bacteria, etc., in a stable plant soluble form which is stored for future use. The plants use the stored pool of nutrients when they need them and they are not easily leached into the environment. You can see change in as little as 10 days, it’s in the form of soil aggregates at soil level. This is called the cation exchange process. The small supplements of manure (nitrogen) along with a living orchard floor (grass) and the constant wetting and drying speed this processs along. It is soil building and can change the structure of soil even white sand can be altered into a sandy loam over time.
Placing raw manure on mulch (wood chips) at the drip line could lead to nitrogen runoff and other problems like phosphorous fixation which will show as a magnesium or zinc deficiency. You would have less of a chance of this happening if your mulch was living (grass).
The age of someone’s trees has nothing whatsoever to do with ones own knowledge of organic farming. People sell property and start new farms with small trees but retain their knowledge to share with others free of charge who have a real interest in healing the planet and learning how organic systems work. :-)
Soil aggregates from sand.