EVALUATION OF NUTRIENT STATUS AND SOIL FERTILITY AND UTILIZATION OF LOCAL WEEDS AS ORGANIC FERTILIZER IN AGRICULTURAL LAND AFFECTED BY LIQUEFACTION NATURAL DISASTER
Isrun Isrun

Faculty of Agriculture, Tadulako University

Abstract

The 2018 earthquake and liquefaction natural disasters that affected several villages in Sigi Regency, Central Sulawesi, Indonesia, impacted land damage and had implications for the social and economic life of the local communities. This study aims to a) evaluate the nutrient status and fertility of degraded soils due to liquefaction, and b) identify weed species as a source of organic fertilizer and determine the need for fertilizer for sweet corn that can be developed to support increased farmers^ income. The research was carried out in two stages: field research regarding the evaluation of soil fertility status and determination of weed species for organic fertilizer, and fertilizer recommendations (phase I). The second phase involved testing organic fertilizer on sweet corn in a screen house. Each research stage took four months. The study^s first phase results identified 17 species of weeds with 11 species of low index class and six species of medium index class. Based on nutrient content, there were four locations with low fertility status, SPL1, SPL5, SPL6 and SPL7. In addition, there were three locations, SPL2, SPL3, and SPL4, with moderate fertility levels. In the study^s second phase, the highest pH H2O (6.38) was obtained at a dose of 25 tons per ha of Bokashi weed and 225 kg per ha of SP-36. This treatment was significantly different from other treatments. The highest available phosphorus was detected at a dose of 25 tons per ha of Bokashi weed 225 kg per ha of SP-36, namely 28.87 ppm, which was significantly different from other treatments. Moreover, there was an increase phosphorus uptake in plant due to the application of Bokashi fertilizer and SP-36 fertilizer. P uptake increased at a dose of 25 tones of Bokashi fertilizer per ha (P3) and SP-36 fertilizer dose of 225 kg per ha (S3) with an average of 0.68 g per plant.

Keywords: nutrients, fertility, ameliorants, weeds, corn, liquefaction

Topic: Agriculture Productivity