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Muhardi Muhardi
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Analisis Perkuatan Cerucuk Kayu Bakau Dan Kayu Mahang Terhadap Peningkatan Daya Dukung Tanah Gambut Saputra, Adetia; Muhardi, Muhardi; Fatnanta, Ferry
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Riau province has a very large peatland. Large peatland is constraint in the development of infrastructure of a region. The problems posed ini the field of contruction is the amount of land degradation and low soil carrying capacity. Therefore, an alternative to the soil reinforcement is required by using the cerucuk timber to increase the carrying capacity of the foundation and soil reinforcement. This research was conducted to determine the carrying capacity of mangrove and mahogany wood as reinforcement on peat soil with laboratory scale modeling. The research was done by applying load tests on those timbers in a testing basin with dimensions of 1,2 m x 1 m x 1 m with variations of single pile, group pile consists of 4 piles, and group pile consists of 9 piles. The used method was alpha method as the reference to determine limit bearing capacity. From the test result of settlement interpretation loading of 25 mm on mangrove, it was obtained that maximum bearing capacity were 16,22 kg and 19,85 kg when the pile was embedded for 1 day and 7 days long. As for the mahang, the maximum bearing capacity were 15,51 kg and 18,47 kg when the pile was embedded for 1 day and 7 days long. According to the results, it could be concluded that mangrove piles had a larger bearing capacity compared to mahang piles.Keywords : mangrove piles, mahang piles, foundation`s bearing capacity, peat.
PERTUMBUHAN STEK TANAMAN LADA (Piper nigrum Linn) PADA KOMPOSISI MEDIA TUMBUH DAN DOSIS AIR KELAPA YANG BERBEDA Aldi, Aldi; Muhardi, Muhardi; Lasmini, Sri Anjar
AGROTEKBIS Vol 5, No 4 (2017)
Publisher : AGROTEKBIS

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This experiment aimed to determine the best growing media composition and coconut water in stimulating the growth of pepper plant cuttings. It used a two factorial randomized block design. The first factor was various proportions of media compositions of manure, sand and top soil i.e. 1:4:12; 1:4:6; and 1: 4:4. The second factor was different rates of coconut water i.e. A0           (no coconut water added), A1 (40 cc), A2 (80 cc), and A3 (120 cc). There were 12 combination treatments and each was replicated three times with each treatment consisting of three plants. Parameter observed included shoot length, leaf number, leaf area size, root length, and fresh root weight. The research results showed that there was no significant interaction effect between         the media composition and the coconut water on the shoot length at 45 days after planting (DAP), 60 DAP, and 90 DAP but it was significant at 75 DAP. The interaction effect was also significant on the leaf number at 60 DAP. Only the coconut water had significant effect on the total leaf area size, the root length, and the fresh weight. The stimulation of the pepper cutting growth was best under the 120 cc coconut water treatment per week and the sand, manure and top soil proportion of 1:4:4 treatment. Key Words : Coconut water, pepper cuttings, and planting media
PRODUKSI DAN KUALITAS PRODUKSI BUAH TOMAT YANG DIBERI BERBAGAI KONSENTRASI PUPUK ORGANIK CAIR Wijaya, Agus Sunar; Sangadji, Muhd. Nur; Muhardi, Muhardi
AGROTEKBIS Vol 5, No 1 (2017)
Publisher : AGROTEKBIS

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This research consisted of two stages, the first aimed to determine the best type of liquid organic fertilizer which can be used in the fertilization of tomato plants andthe second aimed to determine the best concentration of liquid organic fertilizer which can be applied to tomato plants. This research purpose was to investigate the response of tomato plant (Solanum licopersicum Mill.) as shown byitsyield and quality.  This research used a Randomized Completely Block design in which seventreatmentsof different concentrations and two types of liquid organic fertilizers were applied.  The treatments significantly affected the number of tomato fruits but not on their weight and diameter as well as the content of C vitamin. Best yield and quality of the tomatoes was found in the gremont liquid organic fertilizer at the concentration of 2.4 ml/80 ml water.Keywords: Liquid organic fertilizer, Quality and Yield of tomato.
KARAKTERISTIK BUAH NANGKA (Artocarpus heterophyllus Lamk) SIAP SAJI YANG DIPASARKAN DI KOTA PALU Rostiati, Rostiati; Anggriana, Anna; Muhardi, Muhardi
AGROTEKBIS Vol 5, No 3 (2017)
Publisher : AGROTEKBIS

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The purpose of this study was to determine the physical, chemical characteristic and organoleptic of jack fruit fast food which marketed in Palu city. This study used a Randomized Block Design (RBD) consisting of 4 locations selling of jack fruit in Palu city and each locations is represented by 4 seller as a group. So there are 16 experimental units. The parameter consisted of flavor, texture, color, taste, fresh weight of fruit and water content. Analysis of the data using another test, if there are significant differences between the result of the analyze then tested by using advanced testing Honestly Significant Different (HSD) of 5% level. The result showed that location selling of jack fruit influential real toward flavor, texture, color, and taste, but nothing influential real toward fresh eight and water content. Key Words : Characteristic, Jack fruit.
Ketahanan Gambut Terstabilisasi Semen Dan Kapur Terhadap Kebakaran Menggunakan Pendekatan Variasi Kadar Air Juliasman, Rendy Dwi; Muhardi, Muhardi; Wibisono, Gunawan
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

A peatland is an area with naturally accumulated decayed organic materials (peat) at the surface. Riau Province has the largest peatlands in Sumatra i.e. 56.1% from the total peatlands in Sumatra. Peat fires have been many times occurred in Indonesia. Stabilization proven to preverent peat fire in Malaysia. Most common available stabilization materials are cement and lime. Research conducted by Zamzam (2017) showed that peat mixed with 5% lime and 15% cement at 100% moisture content, could increase its strength and became less combustible. This research attempts to correlate the mechanical properties of peat that stabilized with cement and lime at various water contents, and its burning resistance. Several water contents applied were 51.52%, 76.77%, 81.82%, 102.02%, 107.07%, and 112.12%. The burning tests were not conducted on sample of 51,52 % water content. The result showed that the optimum strength of stabilized peat mixtures achieved at water content of 76,77%, which had UCS and soaked CBR value of 97.35 kPa and 16,23%, respectively. The burning test showed that the higher the water content, the delay combustible the peat sample,however the mechanical test and burning tests showed the opposite results.Keywords: peat fire, cement, lime, CBR, and UCS.
RESPON PERTUMBUHAN DAN HASIL TANAMAN KANGKUNG (Ipomea reptans Poir) TERHADAP PEMBERIAN PUPUK ORGANIK BOKASHI KOTORAN SAPI Zalna, Zalna; Hadid, Abd.; Muhardi, Muhardi
AGROTEKBIS Vol 6, No 6 (2018)
Publisher : AGROTEKBIS

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Kangkung (Ipomoea reptans Poir) is an annual or annual plant which is an important leaf vegetable in Southeast Asia and South Asia. The purpose of this research was to determine the effect of bokashi fertilizer with different doses of cow dung on the growth and yield of kangkung plants. The research was conducted in November 2017 – January  2018. Planting locations, observations of plant height and leaf number of kangkung plants were carried out in Sidera Village, Biromaru District, Sigi Regency and measurement of chlorophyll content, leaf area, canopy fresh weight, fresh root weight, and total fresh weight of kangkung plants conducted at the Horticulture Laboratory Faculty of AgricultureTadulako University. This research was conducted based on Randomized Block Design (RBD) as the treatment of bokashi fertilizers dosage consisting of 5 levels namely: (A) without fertilizer (control), (B) bokashi fertilizer 7.5 ton/ha, (C) bokashi fertilizer 15 ton/ha, (D) bokashi fertilizer 22.5 ton/ha, and (E) bokashi fertilizer 30 ton/ha, each treatment was repeated 4 (four) times so that there were 20 experimental units.The results showed that cow dung bokashi organic fertilizer had a significant to very significant effect on the growth and yield of kangkung plants on all parameters observed, except for observations of plant height aged 20 days after planting and observations the number of leaves at the age of 20 days after planting. Treatment of bokashi fertilizer with a dose of 30 ton/ha gave the highest growth in all parameters, but not significantly different with the treatment bokashi fertilizer 22.5 ton/ha.
PENGARUH PEMBERIAN PUPUK ORGANIK CAIR LIDAH BUAYA (Aloe vera) TERHADAP PERTUMBUHAN BIBIT KOPI ROBUSTA (Coffea canephora,Pierre) Muhardi, Muhardi; Syafrinal, Syafrinal; Yulia, Arnis En
Jurnal Online Mahasiswa (JOM) Bidang Pertanian Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Pertanian

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The objective of this research is to determine the effect of giving Aloe Vera Biofertilizer Liquid and to get the best concentration to increase the growth of Robusta coffee seeds. This research was conducted at experimental station of the Faculty of Agriculture, Riau University. This research was conducted experimentally using a Completely Randomized Design consisting of five treatments and four replications. The treatment in this study was the treatment without Aloe Vera Biofertilizer Liquid, Aloe Vera Biofertilizer Liquid concentration 5 ml.l-1 air, 10 ml.l-1 air, 15 ml.l-1 air and 20 ml.l-1 air. The data obtained were analyzed by variance and tested further with Duncan new range test at the level of 5 %. The observed parameters were increase in plant height (cm), increase in stem base circumference (cm), increase in number of leaves (strands) and leaf area (cm2). The results showed that the application of Aloe Vera Biofertilizer Liquid with a concentration of 20 ml.l-1 air is the best concentration in increasing the growth of Robusta coffee seeds. Keywords :Coffee Seed, Aloe Vera Biofertilizer
Stabilisasi Tanah Gambut Dengan Kapur Dan Abu Terbang Untuk Mengurangi Kebakaran Lahan Toni, Afriwan; Muhardi, Muhardi; Wibisono, Gunawan
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Fires in peat land in Riau Province commonly happened in the dry season and the water level of peat land was low. To reduce the risk of fires in peat soil can be implemented with the solidification and stabilization. Stabilization of peat soil by used additive ingredients such as chalk (CaCo3) and fly ash was one method of soil stabilization. The Additive ingridients could improve the technical properties and filled the voids in the peat soil was reduced. This research was aimed to determine the optimal composition content of chalk and fly ash to the stabilization of burning peat soil. The optimum water content for compaction was range between 100% and 160%, Hadijah (2006) in Ilyas (2008). Based on literature, this research using 100% water content for compaction. The pure peat soil was burned at the optimum water content and temperature obtained burning point at 72 °C within 4 minutes. After peat stabilization with fly ash 15% and 5% CaCO3, burning point was much longer to 94 °C within 34 minutes. Higest point of ash happened on peat soil with fly ash 15% and CaCo3 5% with a temperature of 206 °C and within 59 minutes. Meanwhile, ingredient content such as peat soil+ 5% CaCo3 + 10% fly ash, peat soil + 5% caco3 + 5% fly ash, and on pure peat soil has a short time. It was because the fly ash and chalk can be reduced the burning process time.Keywords: Peat Soils, Fly Ash, Chalk, Burning Point, Ash Point
Karakteristik Tanah Gambut Yang Distabilisasi Terhadap Pebakaran Z, Harist Febrie R; Muhardi, Muhardi; Wibisono, Gunawan
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Peat is a soft organic soil formed from the decomposition of plants caused by several factors.  The largest peatland area in Indonesia located in Sumatra island. And 60,08% orapproximately 3.867.413 hectares of peatlands of Sumatra island located in Riau Province (Agency for Agricultural Research and Development of the Ministry of Agriculture, 2011). In the dry season on peatlands in Riau frequent fires. One among the method to reduce the risk of peat fires are compaction and stabilization. A stabilizing agent selected is limestone (CaCO3) and Porland Composite Cement(PCC). The purpose of this study to determine the optimum composition lime and cement to the stabilization of burning peat. Optimum moisture content was taken 100% based on Hadijah(2006) in Octriyana (2010). In UCS test, the highest percentage increase occured in variations Peat+5%CaCO3+15%PCC is equal to 59,44% from the value of q¬u pure peat soils. In CBR test, the highest percentage valueobtained in variation Peat+5%CaCO3+15%PCC is equal to 100,17% of CBR pure peat. While in burning process, peat with additive has a burning point and ash point more longerthan pure peat. With the additon of lime(CaCO3) and PCC cement, it can slow combustion process.Keywords: Peat Soils, PCC Cement, CaCO3,CBR, UCS,Burning Point, Ash Point
Pengaruh Spasi Pada Performa Prefabricated Vertical Drain (PVD) Dalam Perbaikan Tanah Lunak Hamida, Hayatul; Satibi, Syawal; Muhardi, Muhardi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Soil condition heaps of times be a problem in a construction work, it is cause the condition soft soil layer have low permeability. Soft ground improvement with vertical drain  is complex analysis for consolidation, got in on space  of prefabricated vertical drain  (PVD). Space is influential at times of settlement. If space too small then it’s not economical, because it will more point to installation PVD. So, did analysis comparison Chai et al method and average method. This comparison between the two method give the result is not to be different, so installation PVD should be with space 1,5 m. it’s from the result with soil data of PLTU Riau. Keywords: Ground Improvement,  penetrated  vertical drain, degree of consolidation (U)
Co-Authors Abdul Hadid Abdul Razzaq Abubakar M. Lajhie Adrianton A. Adwiyah, Rabiatul Ahmad Satria Efendi, Ahmad Satria Aisyah Putri Aldi, Aldi Alex Kurniawandy Amiruddin Sahabu Andi Kamal Ahmad Anggriana, Anna Anita Febriani Annesia Malantiyaz Antika, Cory Arnis En Yulia Arvi Iskandar Asmira, Adhe Athanasius Cipta, Athanasius Benni Harianto Naibaho Budi Hartono Charles AN Chitra Anggriani Salingkat Christoporus, Christoporus Cucut Susanto, Cucut D Gandana Madjakusumah Dance Tangkesalu Darsin Darsin Dede R Oktini Dedy Yasriady Devi Melisa Veronica Dewa Ariembawa Diandra, Roni Dilnalsyah, Felas Dodi Pratama Effendy Effendy Efrian Saputra Ellia Marlina Fadlan Fadlan Fajrian Saddek Ferry Fatnanta Fonda, Hendry Galang Maulana Geulis, Yusanneya Gunawan Wibisono Hadiyan Putra, Hadiyan Hamdana Hamdana Hamida, Hayatul Handri Handri Hapsari, Nurma Murti Hardy Hutahaean Hayatul Hamida Holid Holid Ida Ayu Putu Sri Widnyani Imam Hanafi Indah Fitriana Joko Sampurno Juliasman, Rendy Dwi Jumrah Jumrah Kartika Sari, Desi Kasmuliani, Kasmuliani Kiswanto Kiswanto Krisna, Daniel Surya Lita Darmayanti Made Antara Madyana Patasik Mahfudz Mahfudz Maman Sutisna Marhani Marhani Mellinda, Devi Melyanti, Rika Muh Fardhal Pratama Muhamad Yusa Muhammad Basir Cyio Muhammad Hafizh Anwar Muhammad Naufal Rivan Muhammad Rofiq Muhammad Syafnil Ramadhan MUHAMMAD TAUFIK Mustamin B, Mustamin B Nunung Nurhayati Nurchi Syahri Nurdin Nurdin Nuri Aslami Nurlina Nurlina Okto Ivansyah Ordila, Rian Perdhana, Radhitya Perkasa, Subhan Prawiradilaga, R. Rizky S Prayitno, Dwi Imam Puspa Ningrum Putri, Nofia Afifah Rahma Silva Anita Ralan Ditra Refni Wahyuni Reynaldi Saputra Rezeki, Desi Saputri Sri Ridwan Hamdani Ridwan, Alfadhella Rio Hidayat Rizqi Yuliana Robi Handi Putra Roni Indra Lesmana Rosianti Mokoginta Rostiati Dg Rahmatu Rustam Abd. Rauf Rustan, Sriwahyuni s, Pirmadona Sabna, Eka Said Defri Ariandi Salsabila Hasanah Sangadji, Muhammad Nur Sanjaya, Gigih Santi Santi Saputra, Adetia Sentana, Jeri Trio Sihombing, Halasan Sitti Rahmayani Soewignjo Agus Nugroho Sri Anjar Lasmini Sri Suwarsi Sulaiman Sulaiman Sundaya Sundaya Suryadi Ramadhan Syafrinal, Syafrinal Syam, Moh Amin Syamsul Arifin Tabah Miftahudin Tomi, Tomi Toni, Afriwan Wardah Wardah Warsidah, Warsidah Wijaya, Agus Sunar Winda Sari Wiwik Handayani Wulansari, Dita Novia Yani Oktavia Yoga Satria Putra Yohanis Tambing Yuda Irawan Yudha Arman Yugo, Tri Yulanda, Yulanda Yulia Beikircher Z, Harist Febrie R Zalna, Zalna Zulivandama, Shaska Ramadhan