Pengaruh Asam 2,4-Diklorofenoksiasetat (2,4-D) dan Benziladenin (BA) terhadap Kandungan Minyak Atsiri Kalus Daun Nilam (Pogostemon cablin Benth.) The effect of 2,4-dichlorophenoxyacetic acid (2,4-D) and benziladenin (BA) on essensial oil production from neem (Pogostemon cablin Benth.) callus culture