I have a bed that has had mulch over it for about 5 years. The soil directly beneath the mulch stays dry and crumbly despite frequent watering. The soil is also quite infiltrated with fine roots, presumbly from 2 nearby (5 meters) large maple trees. I removed the mulch, added new composted soil and sheep manure in ratio of 2:1. I aslo added granulated fertilizer (10:10:10). Should I add the removed mulch to increase organic material and increase moisture retention or will it deplete the soil too much when it decomposes? Thank you!