4George C. Elliott. pH management in container media. Commun.SoilSei. Plant anal. 1996, 27(3&4), 635-649.
5William R. Argo and John A. Biembaum. Lime, water source, and fergilizer nitrogen form affect medium pH and nitrogen accumulation and uptake.. HortSeience 1997, 32 ( 1 ) : 71 -74.