Jurnal TANAH TROPIKA (Journal of Tropical Soils), Vol 22, No 2

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Impovement of Latex Quality Using Locally-Produced Organic Fertilizer from Sewage Sludges in a Rubber Processing

. Riwandi, . Prasetyo, Indra Cahyadinata, Ali Munawar, Rachma Doni

Abstract


Most rubber plants in Indonesia are cultivated in highly-weathered soils; therefore, their annual productions have been relatively low with low quality latex as well. Therefore, some measures must be taken. The aim of this reseach was to increase latex quality from a rubber plantation in low fertility soils using a locally-produced organic fertilizer (LOF). This research consisted of two steps: LOF production and a field fertilization experiment. The LOF was made mainly from wastes materials from a latex processing industry. The field study was to assess the effects of LOF additions enriched with two micronutrients, using a randomized complete block design with 6 LOF levels, 4 soil fertility levels, and 5 rubber trees in each block, resulting in 120 rubber trees. The LOF level were 0, 10, 20, 30, 40, and 50 kgtree-1. The LOF contained 17.35% organic-C, 1.14% total N, 0.53 ppm available P, 1.21 cmol (+)kg-1 echangeable K, and was slightly alkaline (pH 8.0). The soil had low fertility i.e low total N and exchangeable bases (K, Na, and Mg), and very acid (pH 4,5). Variables of quality of latex comprising blockage index, ash-, impurity-, and dry latex-content were observed. Although there were no significant differences in most observed latex variables due to LOF addition, their values tended to be higher when the rubber trees were fertilized.

Keywords: latex, locally-produced organic fertilizer, rubber tree


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