Knowing the nutrient status of growing media is a strategy for precision agriculture. The research aims to study the Liberica coffee seedling response to the nutrient status of peat under the influence of bio-fertilizer. The experiment used a completely randomized design in a factorial treatment arrangement with six replications. 1st factor was peat types; fibric, hemic, and sapric and 2nd factor were inoculated and non-inoculated peat by cellulolytic bacteria. Liberica coffee seedlings were found very responsive to P2O5 and Ca deficiencies, so the growth was not optimal on sapric, whereas the seedlings did not seem to respond to the low K status in fibric. The enrichment of cellulolytic bacteria increased the P2O5 of sapric from deficiency (6.84 ppm) to high (12.25 ppm), although the effect was not yet significant to improve the seedling growth. By cellulolytic bacteria enrichment, stem diameter, stem height, and leaves numbers of Liberica coffee seedlings on fibric added 2.33 mm, 9.25 cm, 3.75 strands, on hemic added 3.05 mm, 7.75 cm, and 4.25 strands and on sapric added 2.18 mm, 2.25 cm, and 1.25 strands, respectively. This study was the first step to getting more precise fertilizers for Liberica coffee planting on peatlands.

Kemiri Sunan [Reutealis trisperma (Blanco) Airy Shaw] is a crop oil-producing plant with great potential as a source of raw materials for the oleochemical, biofuels, and other derivate product industries. Here, we focus on the prospect and potential of the kemiri sunan plant as a potential source of biofuel from inedible crops. The main potential lies in the fruit, which a dry seed production rate of 10-15 tons/ha/year or equivalent to about 8 tonnes of crude oil/ha/yr or about 7 tonnes of biodiesel/ha/yr. This uniqueness can be used as a source of raw materials for biofuel and other chemical industries that do not compete with crop oils for food. However, its current development in Indonesia is still constrained by the availability of land. The alternative that can be taken is to utilize unproductive land, including sub-optimal land, ex-mining land, and other degraded lands. Constraints of limited land for the development of kemiri sunan can be overcome by utilizing less productive lands, including ex-mining land, dry climate dry land, and reservoir buffer land. The condition of the land is sufficient to support the growth and development of the kemiri sunan plant which is quite good. The plant's character is in the form of a tree with a shady leaf crown and a deep root system that makes this plant very useful as a conservation plant on these lands.