Nickel mining activities in Southeast Sulawesi have triggered the physical, chemical and biological degradation of soil. Therefore, the application of organic amendment was an alternative solution to restore the degraded soil. This research aimed to study the effect of ameliorant on soil chemical properties and the effect of ameliorant on yield of cayenne pepper on ex-nickel mining soil. This research was conducted on Field Experimentation Station. Faculty of Agriculture Halu Oleo University, from January to April 2021. This study was carried out using a Randomized Block Design (RBD), which consists of 4 treatments namely without ameliorant (B0), cow manure 60  (B1), biochar husk 60  (B2), cow manure + biochar husk (1:1) 60  (B3) with 4 replications. The results showed that overall ameliorant had an effect on increasing soil pH, Organic-C, available-P, available-K, and Cation Exchange Capacity. Soil pH increased from 4.32 to 6.1, C-organic increased from 0.78% to 1.89%, available-P increased from 3.87ppm to 16.87ppm, available-K increased from 10 mg 100g-1 to 40 mg 100g-1, Cation Exchange Capacity increased from 0.1 me 100g-1 to 75.11 me 100g-1, while total-N increased from 0.21% to 0,38%. Application of 60  (B1) of cow manure increased the plant height and the number of leaves by 29.65 cm and 51,25 respectively.

This study aims to determine the effect of using goat manure on plant growth and to determine the best dose on the growth of mung bean (Vigna radiata L.) on the coastal land of Nambo. The study was conducted from June to August 2021. The study used a Randomized Block Design (RBD) which consisted of 7 treatments and 3 replications so that 21 experimental units were obtained, namely (K0) control 0 g polybags, (K1) 50 g polybags are equivalent to 10 tons ha, (K2)100 g polybags are equivalent to 20 tonsha, (K3)150 g polybags are equivalent to 30 tons ha, (K4) 200 g polybags are equivalent to 40 tons ha, (K5) 250 g polybags are equivalent to 50 tons ha, (K6)300 g polybags are equivalent to 60 tons ha. The results showed that the application of goat manure gave the best N was 1,7% (very high), the best available P was 18,96 ppm (low), and K the best available was 0,60 me 100 g (very low). The highest goat manure application was achieved at a dose of 50 g polybags with an average plant height reaching 48,00 cm and the number of leaves at a dose of 100 g polybags 53,67 strand.

This study aims to determine some of the chemical properties of soil on oil palm land in Anggotoa Village, Wawotobi District, Konawe Regency. This study is geographically located on the line 3°00′ – 4°25′ South Latitude and 121°73′ – 123°15′ BJ located in afdeling 2 of oil palm plantations of PT. Tani Prima Makmur (TPM) aged 10 years in Anggotoa Village, Wawotobi District, Konawe Regency. Soil samples were analyzed at UPT. Halu Oleo University Integrated Laboratory. This research is a descriptive study with an observation method, namely sampling in the field and analyzed in the laboratory to obtain quantitative data. Determination of the point is done by random sampling method. There are 5 sample units to represent 1 (one) block. The results showed that the chemical properties of the soil on oil palm land in Anggotoa Village, Wawotobi District, Konawe Regency were very low. The parameter that becomes the limiting factor is soil pH with a value of 4.29 - 5.88, the criteria for acid-acidic acidity. C-organic content with a value of 0.12 % - 0.86%. very low criteria. N-total with a value of 0.02 % - 0.06%, very low criteria. P-available with a value of 1.23 ppm - 6.26 ppm, very low-low criteria. K-available with a value of 0.26 mg 100 g-1 - 0.38 mg 100 g-1, very low criteria. And CEC with a value of 12.77 me 100 g-1, 21.58 me 100 g-1 and 39.21 me 100 g-1, the criteria are low, medium and high.