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All Journal Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Jurnal Ilmu Pertanian Indonesia Jurnal Ilmu Tanah dan Lingkungan (Journal of Soil Science and Environment) Journal of Tropical Soils Biota: Jurnal Ilmiah Ilmu-Ilmu Hayati Jurnal Tanaman Industri dan Penyegar JTSL (Jurnal Tanah dan Sumberdaya Lahan) Journal of Degraded and Mining Lands Management MAJALAH ILMIAH GLOBE SAINS TANAH - Journal of Soil Science and Agroclimatology Caraka Tani: Journal of Sustainable Agriculture Jurnal Penelitian Kelapa Sawit Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Jurnal Entomologi Indonesia Jurnal Tanah dan Iklim BIOVALENTIA: Biological Research Journal

Gunawan Djajakirana

Departemen Ilmu Tanah Dan Sumber Daya Lahan, Fakultas Pertanian, IPB University, Kampus IPB Darmaga Bogor 16680

Author-ID : 2546177

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Medicine & Pharmacology

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Metode Alternatif Memperkirakan Konsentrasi Karbon Organik Terlarut dalam Air Saluran Drainase dan Tanah Gambut Muhammad Nuriman; Gunawan Djajakirana; Darmawan Darmawan; Gusti Z. Anshari
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) Vol 39, No 1 (2015)
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v39n1.2015.1-8

Keanekaragaman dan fluktuasi kelimpahan Collembola di sekitar tanaman kelapa sawit di perkebunan Cikasungka, Kabupaten Bogor Erwinda Erwinda; Rahayu Widyastuti; Gunawan Djajakirana; Yayuk Rahayuningsih Suhardjono
Jurnal Entomologi Indonesia Vol 13 No 2 (2016): Juli
Publisher : Perhimpunan Entomologi Indonesia

Collembola is one of the dominant microarthopods in almost all soils types. They have important function in food webs soil ecosystem. This research was done at Cikasungka oil palm plantation for six months (April until September 2014). The aim of the research was to collect the information of diversity abundance and population fluctuations of Collembola, and their linkages between environmental factors. Collembolans were collected based on four points of soil sample from five trees of oil palm which has similar criteria. Distance of 0, 120, 240 cm from the trees, and compost lane were used to collect the samples. Results showed 37 species from 10.438 individuals with a density of 544 individu/m2. The species belongs to 4 orders and 13 families. Result also showed that are fluctuations in the abundance at the sample sites. The highest abundance of Collembolans was found in base tree zone (920 individu/m2) and compost lane (763 individu/m2). During six months, total populations of Isotomid sp. 5 (Isotomidae) was higher than the others species of Collembolans. Based on the correlation analysis, various species of Collembolans are positively correlated with rainfall and soil pH.

Controls on the net dissolved organic carbon production in tropical peat Siti Nurzakiah; Atang Sutandi; Supiandi Sabiham; Gunawan Djajakirana; Untung Sudadi
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol 17, No 2 (2020): December
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/stjssa.v17i2.45123

Soil factors such as pH and the presence of polyvalent cations can influence the net production of dissolved organic carbon (DOC). This study aimed to determine the main factors that control net DOC production. The study was conducted at Buatan Village, Siak Indrapura Regency, Riau Province, Indonesia. Soil and water sampling were done every month for a year observation, from July 2018 to June 2019. Soil sampling was carried out to determine the concentration of C-organic acids, pH, N, P, K, Cu, and soil water content (SWC). Peat water sampling was carried out using modified pore water sampling to measure DOC concentration. Groundwater level (GWL) and soil temperature were also observed. Multiple regression analysis was performed to find out the soil and environmental factors controlling the net DOC production. The results showed that the net DOC production fluctuated with seasonal changes and soil pH was a significant controlling factor (P = 0.035) and positively correlated (P = 0.040) to the net DOC production. In addition, N-mineral, PO4, and Cu were positively correlated with net DOC production (P-value: 0.026; 0.033; and 0.028; respectively) while C-organic acids and SWC were negatively correlated (P-value: 0.033; and 0.020; respectively). There was no correlation between net DOC production with GWL, soil temperature, and K concentration. This finding confirmed that pH was the main factor controlling the net DOC production and reflects DOC contribution to the solution acidity.

Characteristics of Biochars from Plant Biomass Wastes at Low-Temperature Pyrolysis Liska Mutiara Septiana; Gunawan Djajakirana; Darmawan Darmawan
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol 15, No 1 (2018): June
Publisher : Universitas Sebelas Maret

The effects of biochar as soil ameliorants depend on their characteristics that are influenced by the variation in biomass origin and pyrolysis process. In this context, the objective of this study was to determine the chemical and physical characteristics of seven biochar derived from different biomass wastes - rice husk, corn cob, empty oil palm fruit bunch, bagasse, and sawdust of albazia (Albizzia falcataria), maesopsis (Maesopsis eminii), and mahogany (Swietenia macrophylla) at two low-pyrolysis temperatures (250 and 350 oC). The results showed that the percentage of biochar yield decreased at higher temperature level. However, the increased thermal decomposition of plant biomass wastes (at 350 oC) resulted in higher pH, as well as ash, C, N content of the biochar; but it did not significantly affect nutrient availability. Biochar from wood waste had more C and Ca content. Biochar from rice husk produced the highest ash content, while biochar from empty oil palm fruit bunch yielded the highest pH value, and possessed more nutrients than all the others. Increasing pyrolysis temperature from 250 to 350 oC resulted in greater biochar surface area and total pore volume but produced smaller average pore radius.

Nutrient Release Performance of Starch Coated NPK Fertilizers and Their Effects on Corn Growth Nur Izza Faiqotul Himmah; Gunawan Djajakirana; Darmawan Darmawan
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol 15, No 2 (2018): December
Publisher : Universitas Sebelas Maret

One way to control or slow down the nutrient release rate from fertilizer is by coating technique. Nowadays the use of biodegradable coating materials for slow-release fertilizer (SRF) is preferable because of environmental issues. This research was aimed to make SRF using starches and cellulose as the coating materials and to test the release rate of the nutrients. Five kinds of starches (cassava, corn, sago, wheat, and glutinous rice) and carboxymethyl cellulose (CMC) were used as coating material for granulated NPK fertilizer. The coated fertilizers (NPK SRF) were tested for their leaching rate in the soil by percolation experiment. The results showed that the kind of starch used influenced the release rate of the NPK SRFs. The NPK SRF coated with sago starch exhibited slow release rate and low leached nutrients which also resulted in slow growth of corn plant, as expected of SRF. The use of starch and CMC as biodegradable coating materials in this research has a possibility to affect the microbial activity in the soil so that the nutrient release became faster than the uncoated NPK fertilizer.

Aplikasi Kombinasi Biochar dan Pupuk Hayati pada Tanaman Jagung di Lahan Kering Kabupaten Pandeglang: Application of Biochar and Biofertilizer Combination on Corn in Up Land Pandeglang Regency Dhanti Hanifa Muslimah; Rahayu Widyastuti; Gunawan Djajakirana
Jurnal Ilmu Tanah dan Lingkungan Vol 24 No 2 (2022): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitl.24.2.47-52

Biochar merupakan bahan alternatif pembenah tanah dari pemanfaatan limbah biomassa berpotensi sebagai bagian dari upaya rehabilitasi lahan terdegradasi, khususnya lahan kering. Biochar juga berfungsi sebagai habitat mikrob tanah yang berperan penting dalam ketersediaan unsur hara bagi tanaman. Pemanfaatan pupuk hayati di bidang pertanian merupakan bagian dari dukungan terhadap pertanian berkelanjutan karena bersifat ramah lingkungan. Berdasarkan latar belakang tersebut, penelitian ini bertujuan untuk mengkaji pengaruh aplikasi kombinasi biochar dan pupuk hayati terhadap sifat kimia dan biologi tanah serta pertumbuhan dan hasil tanaman jagung di lahan kering Kabupaten Pandeglang. Percobaan ini merupakan percobaan faktorial dua faktor yang ditempatkan dalam rancangan acak lengkap. Faktor pertama adalah biochar dengan 3 taraf (0; 2.5; 5 ton ha-1) dan faktor kedua adalah kombinasi pupuk hayati cair (PHC) dengan pupuk NPK terdiri atas 5 macam (100% PHC, 100% NPK, 25% PHC + 75% NPK, 50% PHC + 50% NPK, dan 75% PHC + 25%NPK). Masing-masing perlakuan diulang sebanyak 3 kali sehingga terdapat 45 satuan unit percobaan. Hasil penelitian ini menunjukkan aplikasi biochar dosis 5 ton ha-1 (B2) nyata meningkatkan K-tersedia dalam tanah dan tinggi tanaman. Kombinasi pemupukan 75% pupuk hayati cair dan 25% pupuk NPK (P4) nyata meningkatkan jumlah populasi bakteri penambat N2 dan bakteri selulolitik. Kombinasi biochar dosis 2 dengan 100% pupuk NPK (B2P1) merupakan kombinasi perlakuan yang paling baik dalam memperbaiki status unsur hara tanah. Di sisi lain, kombinasi aplikasi biochar dosis 1 dengan pemupukan pupuk hayati cair dan pupuk NPK konsentrasi 50:50 (B1P3) memiliki peluang untuk mendukung pertumbuhan dan hasil tanaman jagung.

PENGARUH MEDIA TANAM TERHADAP PERTUMBUHAN BIBIT TANAMAN CABAI (Capsicum annuum L) DAN INTENSITAS SERANGAN LAYU FUSARIUM (Fusarium oxysporum Schlecth) PADA PEMBIBITANNYA: The effect of growing media on the growth and intensity of Fusarium wilt due to Fusarium oxysporum in chilli (Capsicum annum) nursery Gunawan Djajakirana; Putri Handayani Sijabat
Jurnal Ilmu Tanah dan Lingkungan Vol 24 No 2 (2022): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jitl.24.2.62-66

Various fauna and flora live and thrive in the soil. The existence of soil organisms is not always beneficial for plant growth. Fusarium oxysporum is one of harmful fungi for plants that is living in soils. Plants affected by Fusarium oxysporum can show wilt symptoms and even die so that it becomes a limiting factor that causes decrease in production and crop failure. Several studies have been conducted to overcome the problem of Fusarium wilt in plants like eradicating disease-struck plants, using fungicides and using biological agents such as Trichoderma sp., but the Fusarium wilt disease can not be handled well. Based on this case, this research was conducted to determine the effective way to treat Fusarium wilt disease in chilli plants by improving the nursery media. This research was conducted by combining charcoal and or cocopeat with soil in which Fusarium had been developed. This is expected to improve the physical, chemical, and biological properties of the soil so that the growth of chilli seedlings will be better and the Fusarium oxysporum fungi does not infect chilli seedlings. The study was conducted in a plastic house using Completely Randomized Design (CRD). The results showed that the addition of charcoal and or cocopeat with soil show the significant effect on the growth of chili plants and decrease the level of disease intensity up to 0 % while the percentage of Fusarium wilt on soil only treatment reached 53.57 %. Based on this research, it was concluded that the addition of charcoal and or cocopeat media on soil media had a significant effect on the growth of chilli plants and inhibited the growth of Fusarium oxysporum even though the medium was infected with that fungi.

PEMBUATAN DAN APLIKASI PUPUK ORGANIK CAIR (POC) SEBAGAI SUBSTITUSI NUTRISI AB MIX TERHADAP TANAMAN KANGKUNG (Ipomoea reptans) PADA HIDROPONIK WICK SYSTEM Indri Hapsari Fitriyani; Qonita Qurrota A’yun; Gunawan Djajakirana
Jurnal Tanah dan Sumberdaya Lahan Vol. 10 No. 2 (2023)
Publisher : Departemen Tanah, Fakultas Pertanian, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jtsl.2023.010.2.23

The price of the AB mix is relatively high, so it needed to find another alternative with a more economical price. One of the alternatives is Liquid Organic Fertilizer (LOF). This study aimed to know the quality of LOF made from banana peels and chicken egg shells, the effect of LOF on the water spinach grown in the hydroponic wick system, and the possible use of LOF as a substitute for AB mix. The experiment consisted of three stages. The first stage was the nutrient analysis of raw materials. The second stage was the production of LOF and nutrient analysis. The results of fermented fertilizers are called POC PT. The third stage was an experiment on water spinach in a hydroponic wick system. The experiment used a completely randomized design with five fertilizer treatments, namely P0 (control), P1 (AB mix nutrition), P2 (LOF PT 150%), P3 (LOF PT 100%), P4 (LOF PT 50%) in three replications. The results showed that LOF, which was fermented for three weeks, had a low nutrient content and was below the Ministry of Agriculture standard. The available N content in POC PT was low, so Ca(NO3)2 fertilizer was added to POC PT. The LOF PT treatment had higher plant growth parameter than the control treatment. Thus, the treatment of LOF PT could not substitute AB mix.

Assessing N2O Emissions from Tropical Crop Cultivation in Mineral and Peatland Soils: A Review Suwardi Suwardi; Darmawan Darmawan; Gunawan Djajakirana; Basuki Sumawinata; Nourma Al Viandari
Caraka Tani: Journal of Sustainable Agriculture Vol 38, No 2 (2023): October
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/carakatani.v38i2.75235

Nitrous oxide (N2O) emissions from agricultural activities contribute significantly to global warming. Understanding the factors influencing N2O emissions is crucial for developing effective mitigation strategies. This review assesses N2O emissions from various crops cultivated in tropical mineral and peatland soils, providing insights into the impact of land use, fertilization practices and rainfall on N2O fluxes. Field measurements of N2O fluxes were conducted in agricultural fields growing corn, peanuts, and cassava in Bogor Regency, West Java Province, as well as in peatland areas with Acacia plantations and natural primary forests in Bengkalis Regency, Riau Province. The study assesses the total N2O fluxes for each crop and land type, revealing significant variations in N2O emissions among different crops and land uses. Peatland areas exhibit higher emissions compared to mineral soils, emphasizing the need for targeted mitigation measures in these ecosystems. The findings highlight the importance of considering the type and age of land use when evaluating N2O emissions. Land management practices, such as fertilizer use and soil disturbance, emerge as critical factors affecting N2O emissions. Improper fertilizer application and excessive soil disturbance can lead to increased N2O emissions, underscoring the necessity for careful N fertilizer management and conservation tillage techniques.

Pengaruh Pemberian Kompos Pada Pertumbuhan dan Produktivitas Tanaman Bawang Merah (Allium cepa L.) Riki Ruhimat; Gunawan Djajakirana; Sarjiya Antonius
Jurnal Ilmu Pertanian Indonesia Vol. 28 No. 4 (2023): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18343/jipi.28.4.534

Shallot productivity relies on diverse environmental conditions, including soil fertility. Compost is an organic material that is crucial for the improvement of soil health and fertility. Compost amendment could be employed on shallot to improve its growth and productivity. This study aims to investigate the effect of 4 different composts amendments, processed with 4 different bioactivators, on the shallot growth (Bima–Brebes variety), the dynamic of culturable microbes, and nutrient content on the growth medium inside the polybag. Treatments include a mature compost processed with no biactivators (K0), and with the bioactivator Bioaktimo (K1), Beyonic Startmik (K2), indigenous (K3), and the mixed of K1, K2, and K3 (K4). Measured parameters on shallot growth include plant height, number of leaves, stem diameter, wet and dry weights of shallot bulb, root, and above-ground biomass, and chlorophyll content. In addition, physical, chemical, and biological characteristics of the initial planting medium on the polybag were determined. The result showed that compost amendment significantly increased all parameters tested, except chlorophyll content, when compared to the control and the treatment with 100% chemical fertilizer. The best shallot growth was found in the treatment with soil planting media of 75% Soil + 25% Compost K4 (TK5). Keywords: organic fertilizer, bioactivator, shallot

Co-Authors , Suprihati . DARMAWAN . Suwardi . Suwardi Amanda Kusuma Dewi Atang Sutandi Basuki Sumawinata Darmawan Darmawan Darmawan Darmawan Darmawan Dewi, Tirta Kumala Dhanti Hanifa Muslimah DWI ANDREAS SANTOSA Edwin Aprianda Eko Mapilata, Eko Erwinda Erwinda Gunawan Sutio Gusti Z. Anshari Iman Rusmana Indri Hapsari Fitriyani Indriyani, Yohanna Anisa Indriyati, Lilik Tri ISKANDAR Iskandar Iskandar Iskandar Iswandi Anas Iswandi Anas Komarsa Gandasasmita Kurnia Dewi Sasmita Laksono Trisnantoro Lili Handayani, Lili Munoz, Canecio Peralta Nourma Al Viandari Nur Izza Faiqotul Himmah Nuriman, Muhammad Nurul Faoziah Oktariani, Putri Putri Handayani Sijabat Qonita Qurrota A’yun RAHAYU WIDYASTUTI Riki Ruhimat Sarjiya Antonius Sarjiya Antonius Septiana, Liska Mutiara Simbolon, David Ricardo Siti Nurzakiah Siti Nurzakiah Sudirman Yahya Supiandi Sabiham Suryawijaya, Putu Kevin Syaiful Anwar Taufiq Hidayat Untung Sudadi Widrializa, . Yayuk Rahayuningsih Suhardjono Yohanna Anisa Indriyani

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