Kajian Ketahanan Penetrasi Tanah Akibat Residu Frekuensi Pemupukan Anorganik Pada Tanah Ultisol Perkebunan Kelapa Sawit
Oil palm (*Elaeis guineensis* Jacq.) is an important plantation commodity, the productivity of which is influenced by the quality of the root-zone environment. This study aimed to examine soil penetration resistance in Ultisols with varying histories of inorganic fertilizer application frequency, and its relationship w...