Iswandi Anas
Departemen Ilmu Tanah dan Sumberdaya Lahan Fakultas Pertanian Insttut Pertanian Bogor

Published : 43 Documents
Articles

STUDI KUALITAS PUPUK FOSFOR (P) DAN KALIUM (K) YANG DIJUAL DI KIOS PENYALUR RESMI PUPUK DI KABUPATEN BOGOR, CIANJUR, DAN SUKABUMI, JAWA BARAT Anas, Iswandi; Hazra, Fahrizal; Baki, Yuwan Pratama; Windi, Windi; Hariyani, Heni; Sitepu, Rosinta; Aprilian, Grahan Sugeng
Jurnal Ilmu Tanah dan Lingkungan Vol 14 No 2 (2012): Jurnal Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (443.703 KB) | DOI: 10.29244/jitl.14.2.66-72

Abstract

Peredaran pupuk anorganik fosfor (P) dan kalium (K) semakin merajalela dan memprihatinkan. Penjualan pupuk yang tidak berkualitas ini, jelas sangat merugikan petani dan pemerintah karena dapat menggagalkan panen petani dan sekaligus juga dapat menggagalkan program Pemerintah seperti Program Peningkatan Produksi Beras Nasional (P2BN) dan Program Ketahanan serta Keamanan Pangan. Pemerintah telah membentuk Komisi Pengawasan Pupuk dan Pestisida (KP3) di setiap kabupaten dan kota, yang bertugas melakukan pengawasan peredaran dan kualitas pupuk dan pestisida, akan tetapi badan ini tidak dapat menjalankan fungsinya dengan baik. Studi ini dilakukan dengan tujuan untuk mengetahui kualitas pupuk P dan K yang dijual ke masyarakat di kios resmi penyalur pupuk di tiga kabupaten yaitu Bogor, Cianjur dan Sukabumi. Kios resmi penjual pupuk dipilih berdasarkan kecamatan penyaluran pupuk subsidi untuk tanaman pangan dan hortikultura. Dalam studi ini telah diambil 29 contoh pupuk yang terdiri atas: 10 contoh pupuk SP-36, 10 contoh pupuk P selain SP-36, dan 9 contoh pupuk K. Hasil analisis contoh pupuk menunjukkan bahwa pupuk SP-36 yang dijual di kios resmi memiliki kualitas yang baik dengan kadar P2O5 sekitar 35-36% P2O5. Namun pupuk P selain SP-36 yang terdiri dari berbagai merek yang dipasarkan di kios resmi, seluruhnya (9 contoh pupuk) berkualitas sangat rendah, dengan kandungan P2O5 berkisar dari 0.21 sampai 1.04% P2O5. Hanya empat (44%) dari sembilan contoh pupuk K yang berkualitas baik dengan kandungan kalium lebih dari 60% K2O, sedangkan yang lima contoh pupuk kalium lainnya (56%) berkualitas sangat buruk dengan kandungan kalium antara 0.02 sampai 0.08% K2O.
JERAPAN NITROGEN-URINE OLEH ZEOLIT DAN PENGARUHNYA TERHADAP PERTUMBUHAN TANAMAN JAGUNG (ZEA MAYS L.) Indriyati, Lilik Tri; Anas, Iswandi
Jurnal Ilmu Tanah dan Lingkungan Vol 15 No 2 (2013): Jurnal Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (392.786 KB) | DOI: 10.29244/jitl.15.2.84-90

Abstract

Urine umumnya mengandung unsur hara, terutama nitrogen (N) yang tinggi, mudah larut dan tersedia bagi tanaman, tetapi mudah hilang dalam bentuk gas amonia. Nitrogen merupakan unsur hara yang sangat dibutuhkan oleh tanaman. Zeolit merupakan mineral yang memiliki mempunyai afinitas yang tinggi terhadap ion amonium. Zeolit yang mengandung amonium dapat digunakan sebagai pupuk lambat tersedia. Tujuan percobaan ini adalah untuk melihat hubungan antara ukuran zeolit dengan kemampuannya menjerap nitrogen yang terkandung dalam urine sapi, dan mengamati pengaruh ukuran dan takaran zeolit yang telah dicampur dengan urine sapi terhadap pertumbuhan tanaman jagung. Penelitian ini dilakukan dengan percobaan pot di rumah kaca yang disusun secara acak lengkap dengan tiga ulangan. Perlakuan yang diberikan adalah empat taraf takaran zeolit: 1000, 2000, 4000, dan 8000 ppm dengan dua taraf ukuran zeolit, yaitu kurang dari 60 mesh dan 32-60 mesh. Parameter tanaman dan tanah yang diukur adalah tinggi tanaman, bobot kering bagian atas dan akar tanaman, serapan N bagian atas dan akar tanaman, serta KTK tanah. Hasil percobaan menunjukkan bahwa jerapan N-urine semakin besar dengan semakin halus ukuran zeolit. Tetapi pengaruh pemberian zeolit-urine dengan ukuran 60 mesh terhadap tinggi tanaman, bobot kering bagian atas dan akar tanaman jagung umur 21 hari, serapan N akar serta KTK tanah nyata lebih tinggi daripada pemberian zeolit-urine dengan ukuran yang lebih halus (< 32 mesh). Zeolit-urine dengan takaran 2000 ppm nyata meningkatkan tinggi tanaman, bobot kering bagian atas tanaman, serapan N akar, dan KTK tanah, tetapi interaksi antara ukuran dan takaran zeolit-urine tidak berpengaruh nyata terhadap parameter yang diamati. Pada takaran zeolit-urine lebih dari 2000 ppm, semua parameter pertumbuhan tanaman cenderung menurun.
KOMBINASI PUPUK ORGANIK HAYATI DAN PUPUK FOSFAT UNTUK PENINGKATAN KERAGAAN BIBIT KELAPA SAWIT (ELAEIS GUINEENSIS JACQ) Sodiq, Abdul Hasyim; Anas, Iswandi; Santosa, Dwi Andreas; Sutandi, Atang
Jurnal Ilmu Tanah dan Lingkungan Vol 16 No 1 (2014): Jurnal Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (444.872 KB) | DOI: 10.29244/jitl.16.1.38-44

Abstract

Percobaan ini dilakukan untuk mengetahui pengaruh pupuk organik hayati diperkaya mikrob tanah terhadap keragaan tanaman, populasi total mikrob dan populasi mikrob pelarut fosfat di pembibitan kelapa sawit. Persiapan media tanam dilakukan dengan mengambil lapisan tanah atas (topsoil) dengan kedalaman maksimal 25 cm kemudian tanah tersebut dikering anginkan dan dimasukkan ke dalam setiap kantong plastik media tanam dengan volume masing-masing 5 kg. Pengukuran parameter keragaan tanaman bibit kelapa sawit dilakukan dari minggu ke-4 setelah tanam (MST) hingga ke-22 MST di rumah kaca kebun percobaan Cikabayan, Darmaga. Percobaan uji efektivitas mikrob pelarut fosfat (MPF) pada pupuk organik hayati menggunakan Rancangan Acak Kelompok (RAK), yang terdiri dari dua faktor dengan tiga ulangan. Hasil percobaan menunjukkan pengaruh penggunaan pupuk batuan fosfat terhadap tinggi tanaman memberikan hasil yang lebih baik dibandingan penggunaan SP-36 dan analisa statistik terhadap pengaruh tunggal pupuk organik hayati, pengaruh pupuk organik terhadap populasi total mikrob menunjukkan hasil terbaik.
DOUBLE INOCULATION OF RHIZOBIUM AND ARBUSCULAR MYCORRHYZAL FUNGUS TO IMPROVE THE GROWTH OF YAM BEAN Anas, Iswandi; Yulliawati, T; Heinzemann, J
Jurnal Ilmu Tanah dan Lingkungan Vol 2 No 2 (1999): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (563.064 KB) | DOI: 10.29244/jitl.2.2.18-22

Abstract

Single inoculation with respectively three strains of Rhizobium (Ci-1, Ci-2, Ci-3) and two strains of arbuscular mycorrhizal fungi (78-1 and 41-3) as well as their double inoculation had been tested for their effectiveness in increasing the growth of yam bean (Pachyrhizus erosus) in a greenhouse experiment. This study was conducted at the Laboratory of Soil Biology, Department of Soil Sciences, Faculty of Agriculture, Bogor Agricultural University (IPB) Bogor. The results showed that all Rhizobium inoculation did not increase the growth of yam bean. On the other hand, inoculation with two strains of arbuscular mycorrhizal fungi increased the plant growth significantly (4 times for strain 78-1 and 1.46 time for 41-3). Double inoculation between three Rhizobium strains and two of arbuscular mycorrhizal fungi strains (78-1 and 41-3) was not significantly different from a single arbuscular mycorrhizal fungi inoculation (78-1 or 41-3).
APLIKASI PUPUK ANORGANIK DAN ORGANIK HAYATI PADA BUDIDAYA PADI SRI (SYSTEM OF RICE INTENSIFICATION) Bakrie, Muchlis Muhammad; Anas, Iswandi; Sugiyanta, Sugiyanta; Idris, Komaruddin
Jurnal Ilmu Tanah dan Lingkungan Vol 12 No 2 (2010): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (491.442 KB) | DOI: 10.29244/jitl.12.2.25-32

Abstract

Excessive use of inorganic fertilizers mainly NPK causes soil degradation, environment pollution, decreases production, and reduces soil biological activity. System of rice intensification is one method of rice cultivation. SRI main principles are seed transplanting at young age (7-11 days old), transplanting use single seedling methode, seedlings at wide plant spacing ? 25x25 cm, intermittent irrigation and field conditions are not flooded, and reduction of chemical fertilizers and application of organic fertilizer. This research was conducted at Situgede Village, West Bogor District, Bogor. The research design was split plot randomized complete block design with three blocks. Two rice cultivation system as the main plot and five combinations of fertilizer application as sub plot. In the main plot consisted of two rice cultivation which is conventional and SRI while the subplot consisted of five combinations of fertilizer application is no fertilition, 100% inorganic fertilizers (Urea = 250 kg ha-1, SP-36 = 75 kg ha-1 and KCl = 50 kg ha-1), 75% inorganic fertilizers (Urea = 187 kg ha-1, SP-36 = 56.8 kg ha-1 and KCl = 37.5 kg ha-1) + 200 kg of bio-organicfertilizer, 50% inorganic fertilizers (Urea = 125 kg ha-1, SP-36 = 37.5 kg ha-1 and KCl = 25 kg ha-1) + 200 kg of bio-organicfertilizer and 50% inorganic fertilizers (Urea = 125 kg ha-1, SP-36 = 37.5 kg ha-1 and KCl = 25 kg ha-1). The results showed that SRI method produced maximum number of tillers higher that of 25.8 tillers/hill or an increase of 64.33% compared with conventional methods. Wet and dry shoot weight of wet and dry weight of root is greater in successive SRI method of 13.3%, 19.1%, 1.40% and 41.8% compared with the conventional method. The number of productive tillers, grain number/panicle, 1000 grains weight, root wet weight and dry grain at SRI method was higher than those in conventional method respectively 58.6%, 37.0%, 2.50%, 25.1% and 32.6%. The uptake of N and P in the SRI method higher at 72.0% and 100% compared to conventional method. Application 50% inorganic fertilizer + 200 kg bio-organic fertilizer, producing more fresh weight biomass, plant dry weight, wet weight and dry weight, number of productive tillers, 1000 grain weight respectively 13.9%, 42.0%, 49.8%, 74.0%, 10.7% and 2.48% compared with the dosage recommendations dose or 100% inorganic fertilizer. N, P and K uptake at 50% inorganic fertilizer + 200 kg of bio-organic fertilizer treatment higher (55.6%, 66.7% and 46.2%) than the full recommendation dose of inorganic fertilizer. Bio-organic fertilizer can be used as substitute of NPK fertilizer.Keywords : Bio-organic fertilizer, inorganic fertilizer, System of Rice Intensification (SRI)
PRODUKSI MASAL INOKULUM AZOTOBACTER, AZOSPIRILLUM DAN BAKTERI PELARUT FOSFAT DENGAN MENGGUNAKAN MEDIA ALTERNATIF Gunawan, Richard; Anas, Iswandi; Hazra, Fahrizal
Jurnal Ilmu Tanah dan Lingkungan Vol 12 No 2 (2010): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (807.208 KB) | DOI: 10.29244/jitl.12.2.33-39

Abstract

Azotobacter, Azospirillum and phosphate solubilizing bacteria are the most common microbial inoculants used as biofertilizer. To have good quality of biofertilizer, the high number of inoculant cells and suitable carriers as well as the method of carrier sterilization are among the most important factors determined the quality of biofertilizer. Related to the number of inoculant cells in carriers, the growing medium used to cultivate the microbial cells play very important role. For mass production of microbial cells, the medium should be able to support fast growth of microbial cells. The price of medium should be reasonably cheap and the materials used in medium should be available easily. The purpose of this study was to obtain a cheap growing medium that can support high number of microbial inoculant cells and the components of the medium should be easyly obtain and the price is not expensive. The study was conducted at the Department of Soil Science and Land Resources, Faculty of Agriculture, Bogor Agricultural University (IPB). The results showed that the medium IPB RI-1 was able to support the growth of 1010 cfu ml-1 Azotobacter, 108 cfu ml-1 Azospirillum and 109 cfu ml-1 Phosphate Solubilizing Bacteria. The number of bacterial cells in Nutrient Broth medium was only 108 cfu ml-1. This means that the IPB RI-1 medium was able to produce 100-fold population of Azotobacter compared to the growth of this bacterium in Nutrient Broth and Phosphate Solubilizing Bacteria was 10-fold higher than population in Nutrient Broth medium. The costs of the IPB RI-1 and IPB RI-2 were much cheaper compared to the cost of Nutrient Broth medium. The cost of medium IPB RI-1 only 3% (IDR 945) and IPB RI-2 about 2% (IDR 690) of the cost of Nutrient Broth medium (IDR 27,752) per liter medium in the year of 2010.Keywords : Alternative media, Azotobacter, Azospirillum, Nutrient Broth, Phosphate Solubilizing Bacteria
INDONESIAN FARMERS CAN CONTRIBUTE IN REDUCING GREENHOUSE GASES EMISSION FROM WETLAND RICE FIELD Anas, Iswandi; Megasari, Nia K.; Suprihati, Suprihati; OHTA, Hiroyuki
Jurnal Ilmu Tanah dan Lingkungan Vol 10 No 2 (2008): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (314.274 KB) | DOI: 10.29244/jitl.10.2.54-59

Abstract

Agricultural sector contribute significantly to the total GHG emission. There are some GHG mitigation options available but so far non of these mitigation options is being implemented by farmers. There is no real action have been taken by government to encourage farmers to implement the available mitigation option to reduce GHG emission from wetland rice field. We discuss some mitigation options and we suggest two additional GHG mitigation options namely crops rotation and System of Rice Intensification (SRI) that probably more attractive to farmer to implement them. However the impacts of these two proposed options as GHG mitigation options should be studied further.Key words: Greenhouse gases (GHG), mitigation option, farmer contribution, SRI, crop rotation
INDEPENDENT SMALLHOLDER OIL PALM EXPANSION AND ITS IMPACT ON DEFORESTATION: CASE STUDY IN KAMPAR DISTRICT, RIAU PROVINCE, INDONESIA Erniwati, Erniwati; Zuhud, Ervizal AM.; Anas, Iswandi; Sunkar, Arzyana; Santosa, Yanto
Jurnal Manajemen Hutan Tropika Vol. 23 No. 3 (2017)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (560.183 KB)

Abstract

Independent smallholders who manage their own oil palm plantations without receiving technical assistance and agricultural inputs from oil palm estates or government have been  increasing rapidly in Indonesia in recent years. However the magnitude of their impacts on tropical forest deforestation remains largely unevaluated.  The objective  of this study was  to explore the history of land use, and the changes in land cover and status since the onset  of  oil palm plantation activities. The study was conducted from March to April 2016. Surveys  were carried out in 30 ha of independent smallholder oil palm in  Kampar District, Riau Province.  To identify the land status, the Agreed functional forest classification (TGHK) and Provincial land use planning (RTRWP) maps were overlaid on images of the area of independent smallholder oil palm. Landsat images three years before oil palm was established were used to assess forest cover changes.  Furthermore, oil palm smallholders and elders of the local community in the research area  were  interviewed to identify land use prior to oil palm.  Our results showed that, based on land  status, 47% of  the area of independent smallholders? oil palm derived from logged forest; that is the land  changed in status from forest to oil palm plantation.  The other 53% of oil palm area derived from non-forested land. The land use history before the establishment of independent smallholder oil palm mostly comprised general-purpose field activities and former forest-felling (forest concessions). The land cover  before conversion into oil palm comprised rubber plantation, secondary forest, and shrub cover. From the results of our survey, we conclude that most of the oil palm plantations planted between  1990 and 2002 have their origins not in primary forest, but rather in  degraded secondary forest, former fields, and shrub-land. These results imply that conversion of forest area into oil palm plantations is not the direct cause of deforestation in the tropical forests of Kampar, Riau Province.
ABILITY OF BACTERIA ISOLATED FROM BLACK WATER ECOSYSTEM OF CENTRAL KALIMANTAN IN DEGRADING OF CRUDE OIL AND DIESEL OIL Anas, Iswandi; Hadi, Noegroho; Santosa, Dwi Andreas
Jurnal Ilmu Tanah dan Lingkungan Vol 2 No 2 (1999): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (907.703 KB) | DOI: 10.29244/jitl.2.2.1-7

Abstract

The objective of this experiment was to evaluate the abili!y of bacteria strains isolated from black water ecosystem of Central Kalimantan in degrading crude oil and diesel oil. The experiment was conducted at the Laboratory of Soil Biology, Department of Soil Sciences, Faculty of Agriculture, Bogor Agricultural University (IPB). The crude oil degrading ability of bacteria was tested on a minimum liquid medium (Gurujeyalakshmi dan Orial, 1989) and soil. Six crude oil and diesel oil degrading bacteria were isolated. The bacteria were identified as Bacillus panthotenticus (2 strains), B. circulars (1 strain), Pssudomonas diminuta (1 strain), P. stufzeri (1 strain) and Klebsiella edwardsii (1 strain). These bacteria were able to degrade crude oil or diesel oil whether in a liquid minimum medium or in soil.On a minimum liquid medium, after 10 days incubation, bacteria were able to degrade 20.49% of the crude oil, while in the Entisol soil, after 7 days of incubation, as high as 40.29% of crude oil was degraded and after 28 days incubation, 64.95 of crude oil had been degraded by selected bacteria.
PRODUKSI GAS KARBON DIOKSIDA SELAMA PROSES BIOREMEDIASI LIMBAH HEAVY OIL DENGAN TEKNIK LANDFARMING Charlena, Charlena; Mas?ud, Zainal Alim; Anas, Iswandi; Setiadi, Yadi; Yani, Moh.
CHEMISTRY PROGRESS Vol 3, No 1 (2010)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.3.1.2010.66

Abstract

Bioremediation is defined as biological degradation process of organic or inorganic wastes in a controlledcondition to control and reduce their amount in the environment. In this study, the soil which had been polutedby heavy petroleum oil fractions, i.e. heavy oil waste (HOW), was used as sample. The bioremediationtechnique used in this study is an ex-situ technique. This study was conducted to determine the amount ofproduced CO2 gas during the HOW degaradation process. Treatment of heavy oil waste with biostimulation andbioaugmentation. Production of CO2 gas were placed in impiger and analysis with titrimetry method. The highestCO2 production mean was obtained from the bioaugmentation treatment with compost adding, i.e. 244,5 mg/m3.Generally, graphs CO2 gas production followed a similar sinusoidal pattern. From these results it can beinfered that the degradation process of HOW happened during the treatments in aerobic condition.
Co-Authors , Nelvia , Sugiyanta , Suprihati - Suwarno . Triadiati A Noeralam Abdul Hasyim Sodiq, Abdul Hasyim Abha Mishra, Abha Amir Kassam, Amir Amod K. Thakur, Amod Andreas Panjaitan, Andreas Ania Citraresmini Arum Asiyanti Suhastyo, Arum Asiyanti Arzyana Sunkar Atang Sutandi Atang Sutandi Sutandi Bakrie, Muchlis Muhammad Bariot Hafif Bariot Hafifa Bedah Rupaedah, Bedah CECEP KUSMANA Charlena Charlena Cintaresmini, Ania D.A Santosa Dedi Nursyamsi Desak Ketut Tristiana Sukmadewi, Desak Ketut Tristiana Dwi Andreas Santosa Edi Santosa Enny Widyati Erdy Santoso Erniwati Erniwati Ervizal AM. Zuhud Fahrizal Hazra Fakhrur Razie Grahan Sugeng Aprilian, Grahan Sugeng Gunawan Djajakirana Haryanti Haryanti Heni Hariyani, Heni IRDIKA MANSUR J Heinzemann J. L. O. Tampubolon Joeli Barison, Joeli Komaruddin Idris Kurnia Dewi Sasmita Kurniawan, Rury Lilik Tri Indriyati, Lilik Tri Lukman Gunarto Lumbantobing, Ester LN Mas'ud, Zainal Alim Mas?ud, Zainal Alim Megasari, Nia K. MIFTAHUDIN MIFTAHUDIN Moh. Yani Mutiara Dewi Puspitawati N Handayani Noegroho Hadi Norman Uphoff Nurul Hidayati O.P Rupela, O.P OHTA, Hiroyuki Putri, Sindy Marieta RAHAYU WIDYASTUTI Richard Gunawan Rina D. Ningsih Rosinta Sitepu, Rosinta Sitanala Arsyad Sri Wilarso Budi SUBOWO GITOSUWONDO Sugiyanta . Sugiyanta Sugiyanta Supiandi Sabiham Suprihati Suprihati Suwarno Suwarno Suyamto Suyamto Syahreza, Ahmad T Yulliawati T. M. Thiyagarajan, T. M. TRIADIATI TRIADIATI Triyani Dewi Violita Violita Wahono Sumaryono Wanodyanti, Niken Dyah Windi Windi, Windi WIWIK EKO WIDAYATI Yadi Setiadi YANTO SANTOSA YULIN LESTARI Yuwan Pratama Baki, Yuwan Pratama