This investigation was carried out during two successive seasons (2015/2016 and 2016/2017) under green- house conditions at Horticultural Research Institute garden "Giza- Egypt". Four citrus rootstocks : Volkamer lemon "VOL" ( C. volkameriana), Sour orange "SO" (C. aurantium ), Troyer citrange "Tr.C" (C.sinensis x P. Trifoliata ) and Cleopatra mandarin"CLEO" ( C. reshni) to study effect of some natural treatments i.e., : Diatoms, Magnetized water , Bread Yeast extract , Moringa leaves extract and GA3 in seedlings bio- chemical and minerals contents in compared to the untreated one ( the control ) . Results revealed that, most of natural extracts treatments under study positively improved stocks seedlings bio- chemical and minerals contents. Diatoms treatment significantly increased: shoots dry matter %; leaf K, Mg and Mn contents. Magnetized water treatment statistically increased: leaf Chl.a; tot. indoles and Phenols . Yeast extract treatment significantly increased: leaf dry matters % and leaf N contents. Moringa leaves extracts treatment significantly increased: shoots dry matter content; Chl.b; tot. Chls; tot. Carotene; stem tot. Crbohydrates and leaf: P; K; Mg; Fe and Zn contents. Finally, GA3 treatment statistically increased: Chl.a; Chl.b; tot.Chls and leaf: Mg and Mn. for both seasons of study. As for stock seedlings responsibility: data clear that natural extracts treatments significantly increased: VOL seedlings: leaf: P; K; Zn and Mn content. Also, SO: seedlings leaf: Carotene; P; K and Zn contents. Tr.C. seedlings: leaf and root dry matter content; Chl.a; b and tot. Chls; stem Carbohydrates content; leaf Indoles and Phenols and leaf: P; Mg and Fe contents. Moreover, CLEO. Seedlings: number of leaves; stem dry matter; leaf Carotene; Indoles and Phenols and leaf: N; Fe and Mn contents.