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Berikut ini penggolongan unsur hara tanaman menurut Davidescu & Davidescu (1988):
GOL | ESENSIAL | NON-ESENSIAL | ||
---|---|---|---|---|
UTAMA | KEDUA | MENAIKKAN PRODUKSI | TIDAK MENAIKKAN PRODUKSI | |
MAKRO | N,P,K | Ca, Mg, S | Na | Si,V |
MIKRO | Fe,Mn,Zn,B,Cu | Mo,Co,CI | Al. l | Ar, Ba, Be, Bi, Br, Cr, F, Li, Pb, Rb, Pt, Sr, Se |
KETERANGAN:
Nitrogen (N), Fosfor (P), K (Kalium), Fe (Besi), Mn (Mangan), Zn (Seng), B (Boron), Cu (Tembaga), Ca (Kalsium), Mg (Magnesium), S (Belerang), Mo (Molibdenum), Co (Cobalt), CI (Klor), Na (Natrium), Al (
Alumunium), Si (Silika),......