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All Journal Agrotrop : Journal on Agriculture Science Jurnal Solum Gontor AGROTECH Science Journal AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment)

Hermansah Hermansah

Agriculture Faculty, Andalas University. Indonesia

Author-ID : 2854031

Religion Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Education Electrical & Electronics Engineering Environmental Science

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Articles

KLASIFIKASI BEBERAPA SUMBER BAHAN ORGANIK DAN OPTIMALISASI PEMANFAATANNYA SEBAGAI BIOCHAR Sismiyanti Sismiyanti; Hermansah Hermansah; Yulnafatmawita Yulnafatmawita
Jurnal Solum Vol 15, No 1 (2018): JURNAL SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

Optimalisasi pemanfaatan bahan organik akan dapat dilakukan dengan mengetahui kualitas bahan organik tersebut. Kualitas bahan organik tidak hanya ditentukan oleh kandungan hara, namun juga kecepatan pelapukannya yang dilihat dari kandungan lignin, nisbah C/N, C/P, dan C/S. Pengujian terhadap 24 jenis sumber bahan organik di Kota Padang ini telah dilakukan pada bulan November 2016-April 2017 di laboratorium kimia tanah Fakultas Pertanian Universitas Andalas. Penelitian ini bertujuan untuk mengelompokkan bahan organik berdasarkan kandungan haranya, menentukan bahan organik yang dapat dimanfaatkan sebagai sumber biochar, dan mengkaji karakteristik dari biochar yang dihasilkan. Parameter analisis bahan organik meliputi kadar air, C-total, N-total, P-total, K-total, C/N, C/S, C/P, dan kadar lignin. Parameter analisis biochar meliputi kadar air, kandungan N-total, C-total, P-total, K-total, S-total C/N, dan kadar abu. Dua puluh empat (24) sumber bahan organik yang tersedia, dapat disimpulkan bahwa berdasarkan kandungan haranya bahan organik ini diklasifikasikan menjadi 2 yaitu : a) bahan organik berkualitas tinggi, yang terdiri dari: tithonia, krinyuh, gamal, kiambang, widelia, paku resam, azola, enceng gondok, alang-alang, jerami kacang tanah, jerami kedele, jerami jagung, kulit kakao, pupuk kandang ayam, pupuk kandang sapi, dan kulit jengkol, dan b) bahan organik berkualitas rendah yang dinyatakan berdasarkan kadar lignin, C/N, C/P dan C/S yang tinggi, yang terdiri dari : jerami padi, sekam padi, pelepah kelapa sawit, tongkol jagung, tandan kosong kelapa sawit, ampas tebu, ampas kelapa sawit, dan serbuk gergaji. Bahan organik berkualitas rendah yang dioptimalkan untuk dimanfaatkan sebagai bahan biochar adalah jerami padi, sekam padi, dan tandan kosong kelapa sawit, dengan karakteristik kimia biochar yang dihasilkan memiliki C-total (28,86%), N-total (1,27%), P-total (0,28%), K-total (0,76%), S-total (0,21%), kadar abu (25,42%), C/N (22,72), C/P (103,07), dan C/S (137,43).Kata kunci : bahan organik, biochar.

DYNAMICS OF SOIL ORGANIC CARBON FRACTIONS UNDER DIFFERENT LAND MANAGEMENT IN WET TROPICAL AREAS Ermadani Ermadani; Hermansah Hermansah; Yulnafatmawita Yulnafatmawita; Auzar Syarif
Jurnal Solum Vol 15, No 1 (2018): JURNAL SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

Karbon (C) organik tanah yang merupakan bagian utama dari bahan organik tanah mengalami penurunan sebagai akibat perubahan-perubahan penggunaan lahan dari kondisi alami menjadi lahan-lahan pertanian. Penurunan C organik tanah menjadi semakin besar karena masukan bahan organik yang rendah dan bila penurunan ini. berlangsung terus menerus maka pada akhirnya menyebabkan degradasi tanah. Artikel ini membahas peranan, dekomposisi dan struktur dari bahan organik tanah dalam hubungannya dengan dinamika fraksi C organik tanah pada pengelolaan lahan yang berbeda di daerah tropis basah. Perubahan penggunaan dan pengelolaan lahan menyebabkan terjadinya perubahan C organik total dan fraksi-fraksi C organik labil dan stabil tanah. Beberapa penelitian telah menunjukkan bahwa fraksi C organik labil seperti C organik partikulat lebih responsif terhadap perubahan-perubahan dari pengelolaan tanah dan merupakan suatu indikator yang sensitif dari kualitas tanah. Disamping itu fraksi C organik stabil seperti asam humat yang mengalami perubahan karena praktek-praktek pengelolaan tanah dapat digunakan untuk menilai kapasitas potensial tanah sebagai penyimpan karbon. Perubahan-perubahan penggunaan lahan dan pengelolaan tanah mempunyai pengaruh negatif dan positif terhadap C organik total, fraksi C organik labil (C organik partikulat) dan fraksi C organik stabil (asam humat). Praktek-praktek pengelolaan yang dapat mempertahankan dan memperbaiki fraksi-fraksi C organik tanah meliputi sistem agroforestri, aplikasi pupuk organik, mulsa dan pengembalian sisa tanaman ke dalam tanah. Fraksi C organik partikulat dan asam humat menunjukkan perubahan-perubahan yang lebih besar dibandingkan C organik total akibat perubahan-perubahan penggunaan lahan dan praktek-praktek pengelolaan tanah di daerah tropis basah.Key words : Fraksi C organik, penggunaan lahan, tropis basah

LAJU DEKOMPOSISI SPESIES TANAMAN PENGAKUMULASI KALSIUM (CA) TINGGI DAN RENDAH DI DAERAH HUTAN HUJAN TROPIS SUPER BASAH PADANG SUMATRA BARAT Hermansah Hermansah; Burhanudin Burhanudin; Sri Muhara
Jurnal Solum Vol 7, No 2 (2010): JURNAL SOLUM
Publisher : Jurusan Tanah Fakultas Pertanian Universitas Andalas

Study on decomposition rate of accumulating and excluder tree species of calsium (Ca) was conducted in a super wet tropical rain forest in Gadut Mountain Padang West Sumatra. The purposes of the study were : (1) to understand the rate of decomposition of biomass of Ca accumulating and excluder tree species, (2) to understand the effect of slope position (ridge, midle and lower slope) on decomposition rate within the study plot and (3) to understand the amount of nutrient release to soil ecosystem within certain period. The result of this study showed that the higher decompoisition rate among two species was Eugenia sp, as Ca accumlating tree species which grew at lower slope. Six months after decomposition, 1 ton dry biomass of Eugenia sp contributed 6,8 kg N, 0,4 kg P, 4,12 kg K, 38,76 kg Ca, and 2,1 kg Mg in to the soil. This amount might keep an equilibrium of soil nutreint balance to support the forest ecosystem. However, for one ton dry mass of Lithocarpus korthalsii sp as Ca exluder tree species, after 6 months decomposition, contributed 9,4 kg N, 1,1 kg P, 4,61 kg K, 3,76 kg Ca and 0,54 kg Mg. This indicates that Ca acumulating tree species contributed more Ca compared to Ca excluder tree species in this forest ecosystem. Keywords: Accumulating tree sp., exluder tree sp., decomposition rate, super wet and tropical rain forest.

Effect of Plastic Mulch and Pesticide Application on Chemical Properties of Andisol Maulana Insanul Kamil; Dina Oktaviani; Annisa Rachim; Khairun Nisa Kamarudin; Irwin Mirza Umami; Eti Farda Husin; Hermansah Hermansah
Gontor AGROTECH Science Journal Vol 6, No 3 (2020): Special issue Seminar Nasional Sains dan Teknologi (SNST) 2020
Publisher : University of Darussalam Gontor, Ponorogo, East Java Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21111/agrotech.v6i3.5018

The application of plastic mulch and pesticides is common practice in intensive agriculture in Indonesia. However, their effects on soil fertility are still uncertain. Therefore, this study was aimed to determine the effect of plastic mulch and pesticide application on the soil fertility of Andisol. The experiment was conducted in an intensive agriculture field in West Sumatra and the treatments included were: plastic mulch and pesticide application with two levels of each. Treatments were arranged in a completely randomized design with three replications. The result shows that there were significantly high in pH, total N and exchangeable Mg when using plastic mulch while organic C was found to be low in a plot with the application of pesticide. Meanwhile, the interaction between plastic mulch without pesticide showed a significantly higher in exchangeable Mg. The result suggested that the plastic mulch practice can sustain the availability of nutrients in the soil while the usage of pesticides can reduce the organic C in the soil besides its main function to protect the crops.

Perbaikan Sifat Kimia Lahan Bekas Tambang Emas Melalui Aplikasi Biochar Sekam Padi dan Pupuk Kandang Ayam PANJI ROMADHAN; GUSMINI GUSMINI; HERMANSAH HERMANSAH
Agrotrop : Journal on Agriculture Science Vol 12 No 1 (2022)
Publisher : Fakultas Pertanian Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/AJoAS.2022.v12.i01.p09

Improvement of Chemical Properties of Ex-Gold Mine Land Through Application of Rice Husk Biochar and Chicken Manure. Ex-gold mining land that have been degraded so that soil fertility is very low. Mining with an open system causes an increase in the oxidation of sulfuric minerals which reduces nutrient levels, so it is necessary to make efforts to increase nutrients through the addition of rice husk biochar and manure. The purpose of the study was to determine the role of rice husk biochar and manure to improve soil chemical properties. This study used a completely randomice design (CRD)with 6 treatments and 4 replications. The results showed that 100% manure treatments could increase soil fertility, when the soil pH was 6.28, total N 0.0072%, and available P 59.74 ppm. The best treatments for the organic C parameter is a combination of 50% rice husk biochar + 50% manure, which is 1.42%. Based on research, the addition of organic matter can improve the chemical properties of ex-gold mining land.

Addition of Tithonia Compost and Lime as Ultisol Soil Fertility Improvement for Oil Palm Sedling Media Enita Enita; Nurhajati Hakim; Hermansah; Teguh Budi Prasetyo
AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Vol. 6 No. 1 (2022)
Publisher : Asia Pacific Network for Sustainable Agriculture, Food and Energy (SAFE-Network)

Research to improve soil fertility, especially the chemical characteristics of Ultisol, has been carried out by adding compost and lime. The incubation method of soil plus compost at a dose of 0.5 kg/pot – 2 kg/pot and 1x exchanged Al lime was carried out for 2 weeks. The results of soil nutrient analysis after incubation were an increase in pH of 0.58 points, a decrease in exchanged Al to unmeasured, an increase in the C-organic content of the soil by 3.44%, an increase in the total N-value of the soil by 0.19%, an increase in the amount of soil organic matter. P-available was 5.81 ppm and exchanged K soil increased by 0.02 me/100 g soil. Likewise, the micro elements analyzed also increase. Thus there is a change in the chemical properties of the soil towards the better. The increase in nutrients N, P, K, Ca, and Mg clearly comes from tithonia, which is the result of decomposition of tithonia compost which is added containing high nutrients. In addition, tithonia compost produces organic acids that can dissolve previously insoluble nutrients into soluble ones. The improvement of the chemical properties of the soil towards a better direction is expected to be able to increase the growth of oil palm seedlings planted on the seedling medium growing.

Co-Authors . Gusmini Annisa Rachim Auzar Syarif Burhanudin Burhanudin Dina Oktaviani Enita Enita Ermadani Ermadani Eti Farda Husin Irwin Mirza Umami Khairun Nisa Kamarudin Maulana Insanul Kamil Nurhajati Hakim PANJI ROMADHAN Sismiyanti Sismiyanti Sri Muhara Teguh Budi Prasetyo Yulnafatmawita Yulnafatmawita Yulnafatmawita Yulnafatmawita

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