Studies on volcanic ash of Mount Merapi erupted in 2010 are limited to only characterization of mineralogical, physical, chemical, and biological properties of the volcanic ash. In order to speed up rehabilitation of soils affected by the volcanic ash, it is necessary to study the application of suitable plant species, which is called bio-mechanic conservation. The purpose of this study was to test the environmental adaptability of Canavalia virosa and Flemingia congesta in sandy soil covered by volcanic ash of Mount Merapi. This study was carried out using 2x4 Split-plot randomized block design with three replicates. The main plot of the design was plant species (Canavalia virosa and Flemingia congesta), while the sub plot was the dose of organic matter application (0, 20, 40, and 60 t / ha). Soil parameters measured were N-total, P-total, available P, available K, and organic matter contents. Plant parameters measured were plant dry weight and plant height. The results showed no significant differences in soil N, P and K contents of all treatments tested in this study after 9 weeks, except C organic content. Canavalia virosa grew well until 9 weeks, whereas Flemingia congesta started to die a 9 weeks after planting.
The research had been done in Pereng, Mojogedang, Karanganyar. The aim of the research is to know the influence of enrichment of organic fertilizer with the addition of Silk Tree litter (Albizia falcataria L.) in improving the availability and Mg uptake of rice plants (Oryza sativa L.) fields in Alfisol. The research used a basic design factorial with two factors, it were dose and cropping systems. The data analysis used F test on level 5%, Kruskal-Wallis test, DMR test on level 5%, Mood Median test, and correlation test. The results of the research showed that the availability and uptake of Mg in conventional cultivation system is higher than the SRI cultivation system. Mg uptake in conventional cultivation systems of 0.015 g/plant. The highest Mg availability can be achieved in the combined treatment D6B1 (conventional and 50 % + 100% organic fertilizer dose recommendations Silk Tree litter + 15% weight of organic fertilizer) of 2.34 cmol(+)/kg. Organic fertilizer with the addition of Silk Tree litter can not enrich the availability and uptake of Mg, but conventional cultivation systems influence the availability and uptake of Mg. Conventional cultivation systems influence the availability and uptake of Mg is higher than the SRI cultivation system.
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