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Pengaruh Pemberian Porasi Janjang Kosong dan Dolomit terhadap Pertumbuhan dan Hasil Tanaman Bayam Merah Salampak, Salampak; Sustiyah, Sustiyah; Anwar, Moch; Beladona, Siti Unvaresi Misonia; Hartoko, Galih; Wahyuningtyas, Meylinda Dwi
JURNAL AGROTROPIKA Vol 23, No 2 (2024): Jurnal Agrotropika Vol 23 No 2, Oktober 2024
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/ja.v23i2.9190

Abstract

The utilization of peat soil as a planting medium is still faced with several problems, especially in terms of the chemical characteristics of peat soil. Therefore, there is a need for treatment to improve these problems, one of which is by using the poration of palm oil empty fruit bunches and dolomite. This research aims to determine the effect of providing a technology package of empty fruit bunch and dolomite poration doses on the growth and yield of red spinach plants. The research was carried out at the Greenhouse Jalan G. Obos 24, for 3 months (September-November 2023). The research was carried out using a survey method and experimental tests in polybags, using the RAL method with 9 treatment technology packages, namely: 1) soil without treatment (control), 2) Soil + empty fruit bunches poration 2.5 tons ha-1 + dolomite 2 tons ha-1, 3) Soil + 2.5 tons ha-1 of empty fruit bunches poration + 4 tons of ha-1 dolomite, 4) Soil + 5 tons of ha-1 of empty fruit bunches poration, 5) Soil + 5 tons ha-1 of empty fruit bunches poration + 2 tons ha-1 dolomite, 6) Soil + empty fruit bunches poration 5 tons ha-1 + dolomite 4 tons ha-1, 7) Soil + empty fruit bunches poration 7.5 tons ha-1, 8) Soil + empty fruit bunches poration 7.5 tons ha-1 + dolomite 2 tons ha-1 , 9) Soil + empty fruit bunches poration 7.5 tons ha-1 + dolomite 4 tons ha-1. The variables observed included plant height, stem diameter, root length, plant wet weight, and plant dry weight. Providing a package of peat soil + 7.5 tons ha-1 of empty fruit bunches poration + 4 tons of ha-1 dolomite (T(8)) can increase the growth of red spinach plants which include plant height (4.46 – 37.36 cm), stem diameter (4.48 – 7.06 cm), the wet weight of the plant is 26.10 g/polybag. Keywords : poration, dolomite, plant height, palm oil empty fruit bunch 
Innovation in Road Construction Materials: A Study on the Combination of Biochar and Cement in Improving Subgrade Bearing Capacity Respati, Rida; Salampak, Salampak; Sarie, Fatma; Jaya, Adi
JSE Journal of Science and Engineering Vol. 4 No. 1 (2025): Journal of Science and Engineering
Publisher : LPPI Universitas Muhammadiyah Kalimantan Timur (UMKT)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Road infrastructure development often faces significant challenges due to low bearing capacity of the subgrade, especially when dealing with peat soil. This condition can lead to excessive settlement, deformation, and premature damage to the road pavement, resulting in high maintenance costs. Peat soil is inherently poor in quality, making it uneconomical to use as a subgrade for road pavements. The condition of peat soil significantly impacts road construction in Central Kalimantan Province. Therefore, one effective way to address this issue is through soil stabilization. This research aims to explore the potential of biochar and cement as stabilizing agents to improve the bearing capacity of peat soil. The study involves a series of laboratory tests, including initial physical property tests of the original peat soil, as well as index and mechanical strength tests after the addition of a combination of biochar and cement. The biochar used in this research is derived from coconut shells.The conducted tests include compaction tests to determine the maximum dry density and optimum moisture content, and CBR (California Bearing Ratio) tests to evaluate the soil's bearing capacity. The variations in biochar and cement addition were: 5% biochar with 5% cement, 5% biochar with 6% cement, 5% biochar with 7% cement, and 5% biochar with 8% cement. The research results indicate that the addition of biochar to peat soil stabilization mixtures using cement significantly increases the CBR value. Specifically, adding 8% cement and 5% biochar to peat soil was able to increase the CBR value by up to 9% from the original soil's CBR of 2.2%. Therefore, it can be concluded that the combination of biochar and cement can transform peat soil into a usable subgrade for road construction