“…Heavily cultivated landscapes with coarse‐textured soils in mild climates are at the highest risk for soil carbon (C) deficits (Angers et al, 2011). In many irrigated orchard crops, OMA sources have been shown to increase soil C storage (Bittenbender et al, 1998; Canali et al, 2004; Neilsen et al, 2014; Sanchez et al, 2003). Many different OMA sources are also capable of increasing soil extractable P (Neilsen et al, 2014; Preusch & Tworkoski, 2003) and K (Baldi et al, 2010; Bittenbender et al, 1998; Gülser et al, 2015) as well as improving cation exchange capacity (Cayuela et al, 2004; Arvanitoyannis & Kassaveti, 2007; Amiri & Fallahi, 2009; Miller et al, 2013; Villa et al, 2021) without increasing the risk of soil pollution from heavy metals (Baldi et al, 2021).…”