tobing, wilda lumban, C. Hanum, and E. S. Sutarta. “GROWTH RESPONSE AND NITROGEN USE EFFICIENCY OF PALM OIL VARIETY ON N FERTILIZING IN PRE NURSERY”. Agric, vol. 30, no. 1, July 2018, pp. 43-50, doi:10.24246/agric.2018.v30.i1.p43-50.