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John L. Rantung, John L.
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BIOMONITORING DAMPAK EKOLOGIS MERKURI DI DAERAH ALIRAN SUNGAI TORAUT KABUPATEN BOLAANG MONGONDOW Rantung, John L.; Wantasen, Sofia
EUGENIA Vol 22, No 2 (2016)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.22.2.2016.12956

Abstract

ABSTRACT Traditional gold mining in Toraut Watershed Bolaang Mongondow District was used Merkuri Amalgamation that produced tailing. Tailing are discharged to river and environment sorounding that can enter Toraut River and flows to the down stream Mongondow river (beach Inobonto). This study aims: 1) To determine Hg concentrations in River Toraut up stream, middle stream and down stream; 2) To determine Hg concentrations in sediment of the River Toraut up stream, middle stream and down stream; 3) To determine Hg concentrations in aquatic plantsof the River Toraut up stream, middle stream and down stream.  Location research in River Toraut up stream, middle stream and down stream. Data collected by observation and laboratory analysis Merkuri concentration in River Toraut, sediment, and aquatic plant. Method data analysis are descriptif, Graphic Method and to compare with standart Goverment PP. No.82/2001 Class II. The analysis showed that the concentration of Merkuri in River Toraut up stream, in the middle stream and down stream is<0.00005 mg/l. The concentration of Merkuri in sediments River Toraut up stream, the middle stream and down stream ranged < 0.05-1.45 mg/kg dry. The concentration of Merkuri in tissue plant aquatic location up stream of the River Toraut, the middle stream and down stream range < 0.001-0.013 mg /kg wet.Keywords : biomonitoring, ecological impacts merkuri, Toraut Watershed
PENENTUAN DOSIS FORMULASI PUPUK ORGANIK UNTUK EFISIENSI PENGGUNAAN PHONSKA PADA TANAMAN JAGUNG MANIS (Zea mays sacharata Sturt.) Tulungen, A. G.; Tumewu, P.; Montolalu, M.; Rantung, John L.; Tulung, S.
EUGENIA Vol 25, No 2 (2019)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.25.2.2019.33807

Abstract

The use of organic fertilizer provides soil with macronutrients, micronutrients, and organic acids which improve the long-term physical, chemical, and biological fertility of the soil. This research aims to: 1) Increase physical and chemical soil fertility, 2) Acquire the interaction between organic fertilizer and Ponska fertilizer dosage on sweet corn crops, 3) Acquire the most efficient dosage of PONSKA  fertilizer on sweet corn, and 4) disseminate research results through journal articles and directly to farmers.  This research will increase the efficiency of NPK Ponska chemical fertilizers by utilizing waste from around the farm and lakes to formulate organic fertilizer to apply on sweet corn crops and as a reference to teaching material. Factorial research with two factors was designed using a randomized block design. Factor I (A) = Organic fertilizer formulation, comprising of A1 = 20 ton/ha, A2 = 30 ton/ha, and A3 = 40 ton/ha.  Factor II (B) =  Phonska fertilizer,  comprising of B1 = 25 % Ponska, and B2 = 50% Ponska. Every treatment was replicated four times, yielding 24 research plots. Response variables observed were: Plant height, number of leaves, dry weight of the plant. Data were analyzed using ANOVA, followed by Tukey's honest significance difference test (alpha = 0.05) if significant differences were found. Results showed that the interaction between organic and Phonska fertilizer formulations had significant effects on plant height. A dosage of 40 ton/ha of organic fertilizer can decrease the use of phonska fertilizer by 75% based on the height of sweet corn plants.
PENGARUH WAKTU PINDAH TANAM BIBIT SAWI DAN WAKTU APLIKASI PUPUK ORGANIK TERHADAP BOBOT SEGAR SAWI (Brassica juncea L.) Sompotan, S.; Raintung, J. S. M.; Titah, Tilda; Rantung, John L.
EUGENIA Vol 25, No 3 (2019)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.25.3.2019.33808

Abstract

Organic farming systems utilize organic fertilizer as the main source of nutrients for the crops. The application of organic fertilizer from animal sources, such as manure, can increase soil fertility and crop yield. This research aims to: 1) Study the effects of organic fertilizer dosage and time of application towards the fresh weight of mustard greens, and 2) determine the best application time for the maximum fresh weight of mustard greens. Factorial research with two factors was designed using a randomized block design. The first factor was dosage of organic fertilizer (A): A1 = 15 ton/ha, A2 = 20 ton/ha, A3 = 25 ton/ha, and A4 = 30 ton/ha. The second factor was the time of application (B): B1 = 10 days before planting the seeds, B2 = 15 days before planting the seeds, B3 = 20 days before planting the seeds. Every experimental unit was replicated three times, yielding 36 experimental pots. The variable observed was the fresh weight of mustard greens. Data were analyzed using ANOVA, followed by Tukey's honest significance difference test (alpha = 0.05) if significant differences were found. Results show that the interaction between dosage and time of application had significant effects on the mustard greens' leaf length, plant height, leaf count, leaf width, and fresh weight. Treatment A3B1 (25 ton/ha of organic fertilizer, applied 10 days before planting seeds) gave the heaviest weight (24,07 gram). The longer the application time, the better the effects on the plants. The application of organic fertilizer requires 10 days of incubation before the mustard greens are moved.