Open pit coal mining is common practice to extract coal from lithosphere. This system, however, will bring about soil degradation. Organic fertilization is an alternative to recover fertility of the degraded soil. The objectives of the experiment were to determine nitrate downward movement and change of selected chemical properties in the soil column and to compare the growth of lamtoro (Leucaena leucocephala) as affected by local based liquid organic fertilizer. Column experiment was conducted using mine spoiled soil from Taba Penanjung Sub-District, Central of Bengkulu District, Bengkulu, Indonesia located at approximately 364.5 m above sea level. The experimental design was Completely Randomized Design with 3 treatments consisting of control, 75 and 150 ppm of local based liquid organic fertilizer (LOF). The treatment was replicated 3 times. Soil column was prepared using PVC pipe with diameter of 12.5 cm and length of 40 cm. Soil sample was put into the column and compacted by knocking the base of the column until the soil height achieved 35 cm. Lamtoro was raised in the column for 11 weeks. At the end of experiment, lamtoro shoot was cut and the PVC column was cleaved horizontally and soil was pushed out from the column. Soil sample was, then, sliced into 6 fractions, representing depth of 0-5, 5-10, 10-15, 15-20, 20-25, and > 25 cm. Fresh soil sample from each depth was extracted by distillated water and analyzed for NO3- N. Remaining of soil samples was air-dried for 72 hours, grinded with 0.5 mm screen, and analyzed for available P, exchangeable K, soil pH and exchangeable Al. The experiment indicated that local based liquid fertilizer significantly increased soil NO3-N, available P, exchangeable K, soil pH and reduced exchangeable Al. Higher rates of LOF caused increase in selected soil chemical properties but exchangeable Al. However, NO3-N was potential to move downward to deeper depth of the soil profile. Change of exchangeable Al, soil pH and exchangeable K was observed until 20-25 m depth of soil profile, but change of available P was detected only to 10-15 cm depth. Better soil chemical properties were followed by enhancement of lamtoro growth.

Dry land is one of potential areas for soybean (Glycine max L. Merrill) development. A total of 12 soybean genotypes, including two check varieties of Anjasmoro (high yield) and Demas 1 (adaptive in acidic dry land) were evaluated in two locations of dry land in Gunung Makmur Village and Kuala Tambangan Village, South Kalimantan, Indonesia from May to August 2017. The experimental design in each location was randomized block design (with 12 soybean genotypes as treatments) and four replicates. Data were subjected to combined ANOVA. The range of seed yield in Gunung Makmur was 1.56 t ha−1 to 3.18 t hm−2 and in Kuala Tambangan was 1.72 t ha1 to 2.96 t ha−1. Anjasmoro variety showed a higher productivity than Demas 1. Genotype of 19BE produced the highest yield in Gunung Makmur (3.18 t ha−1), meawhile G511H/Anjs-1-3 produced the highest yield in Kuala Tambangan (2.96 t ha−1). The best genotype across environments was G511H/Anjs-1-3 (2.99 t ha−1), then followed by 19BE (2.74 t ha−1). The G511H/Anjs-1-3 has medium height and a relatively low of empty pods, meanwhile 19BE has medium height and relatively high numbers of nodes per plant and branches per plant. Those genotypes could be developed in acidic dry land area of Kalimantan.