Articles

Found 30 Documents
Search

INCREASING P RETENTION IN THE PEAT COLUMN AMENDED WITH MINERAL SOIL AND SOME ROCK PHOSPHATES Hartatik, W.; Idris, Komarudin; Sabiham, Supiandi; Djuniwati, Sri; Adiningsih, J. Sri
Jurnal Ilmu Tanah dan Lingkungan Vol 6 No 1 (2004): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2434.945 KB) | DOI: 10.29244/jitl.6.1.22-30

Abstract

Peat soils have very low capacity in retaining P. Mineral soils rich in Fe could be used as ameliorant in increasing this capacity. The aim of this experiment was to study the use of three rock phosphates and SP-36 on peat amended with mineral soil in increasing P retention. The experiment was conducted in the laboratory of the Centre for Soil and Agroclimate Research and Development, Bogor. P treatments consist of four P fertilizer sources including Morocco rock phosphate, Christmas rock phosphate, Ciamis rock phosphate, and SP-36, and three P level (50, 100 and 200% of P sorption) plus partial and complete control in 2 replications. The experiment conducted in the soil column made from PVC pipe 4 inches in diameter. The column was filled with 1,250 g peat dry weight (10.5 oC), 250 g of which was amended with mineral soil and each of three rock phosphates or SP-36, and put on as the upper part of the column and incubated for 4 weeks. Leaching was conducted every day, with 50 cc distilled water for 12 days. The filtrate was collected in 500 cc Erlenmeyer glass, and soluble P was analyzed. After this step peat in the colu~nnw as divided into seven depth that was 0-5, 5-10, 10-20, 20-30, 30-40, 40-50 and 50-60 cm, then P-Bray I was analyzed. The results showed that the application of Morocco and Ciamis rock phosphates on peat amended with mineral soil after leaching, resulting in the accumulation of P on the upper layers, suggesting that P retention on peat was increased such that P loss could be reduced. The ratio of P content in the soil column at 0-30 cm and 30-60 cm depth for Morocco rock phosphate on the dosages of 50, 100 and 200% of P sorption were 1.54; 1.90; and 2.79, respectively, and that for Ciamis rock phosphate were 1.64; 1.76 and 4.11, respectively. The application of Christmas rock phosphate resulted in P accumulation at 30-40 cm depth. The ratio of P content in soil column treated with Christmas rock phosphate at 0-30 cm and 30-60 cm depth on dosages of 50, 100 and 200% of P sorption were 1.05; 1.11 and 1.38, respectively, suggesting that P was leached to the bottom layer. It seems that high Fe in Christmas rock phosphate did not contribute to an increase of P retention. Although the application of SP-36 resulted in P accumulation at the upper layers, P leaching was higher. Keywords: Amelioration, Peat, Phosphorus fertilization, Phosphorus retention
PENGELOLAAN DAN PEMUPUKAN FOSFOR DAN KALIUM PADA PERTANIAN INTENSIF BAWANG MERAH DI EMPAT DESA DI BREBES Muliana; Anwar, Syaiful; Hartono, Arief; D. Susila, Anas; Sabiham, Supiandi
Jurnal Hortikultura Indonesia Vol. 9 No. 1 (2018): Jurnal Hortikultura Indonesia
Publisher : Indonesian Society for Horticulture / Department of Agronomy and Horticulture

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (423.407 KB) | DOI: 10.29244/jhi.9.1.27-37

Abstract

ABSTRACTThe management and fertilization of shallot cultivation in Brebes is very intensive. The purpose of this research was to study crop management and phosphorus (P) and potassium (K) fertilizations of shallot cultivation by smallholder farmers in four villages in Brebes. The data were collected through survey method, interview, and questionnaires to 14 respondent farmers, and analysis of P and K content of farmer's soil samples. The results showed that the cropping index (IP) was 400-500% comprised of three to four times of shallot cultivation and one rice cultivation. The fertilizations of P and K were 22-171 kg of P2O5 ha-1 and 22-213 kg K2O ha-1, respectively, while the recommended rates were 54 kg P2O5 ha-1 and 78 kg K2O ha-1, respectively. This varied fertilizations were not significantly correlated with productions, except fertilization of K with production in rainy season that was significantly correlated at P < 0.05 (n = 14, r = 0.532). The soil P status was very high at all locations and at all depths (0 - 80 cm), while the soil K status ranged from medium to very high. Keywords: nutrient accumulation, nutrient availability, nutrient residue, nutrient status, smallholder farmersABSTRAKPengelolaan dan pemupukan pada budidaya bawang merah di Brebes sangat intensif. Tujuan penelitian ini ialah mengkaji pengelolaan pertanaman dan pemupukan fosfor (P) dan kalium (K) bawang merah yang dilakukan petani di empat desa di Brebes. Pengumpulan data dilaksanakan melalui metode survei, wawancara, dan pengisian kuisioner kepada 14 petani responden, dan analisis kadar P dan K sampel tanah lahan petani responden. Hasil penelitian menunjukkan bahwa indeks pertanaman (IP) adalah 400-500% dengan pertanaman bawang merah tiga sampai empat kali dan satu kali pertanaman padi. Pemupukan P dan K berturut-turut berkisar 22?171 kg P2O5 ha-1 dan 22?213 kg K2O ha-1, sementara rekomendasi Distan Brebes berturut-turut adalah 54 kg P2O5 ha-1 dan 78 kg K2O ha-1. Pemupukan bervariasi ini tidak berkorelasi nyata dengan produksi, kecuali pemupukan K dengan produksi pada musim hujan yang berkorelasi nyata pada taraf 5% (n=14, r=0.532). Status P tanah sangat tinggi pada semua lokasi dan pada semua kedalaman (0 ? 80 cm), sementara status K tanah lebih bervariasi, yaitu dari sedang sampai sangat tinggi.Kata kunci: akumulasi hara, ketersediaan hara, petani kecil, residu hara, status hara
STUDI INTENSITAS CAHAYA DAN CENDAWAN MIKORIZA ARBUSKULA PADA PERMUDAAN ALAM RAMIN (GONYSTYLUS BANCANUS (MIQ.) KURZ) (STUDY ON ARBUSCULAR MYCORRHIZAL FUNGI AND LIGHT INTENSITY TO THE NATURAL REGENERATION OF RAMIN (GONYSTYLUS BANCANUS (MIQ.) KURZ)) Muin, Abdurrani; Setiadi, Yadi; Budi, Sri Wilarso; Mansur, Irdika; Suhendang, Endang; Sabiham, Supiandi
Jurnal Manajemen Hutan Tropika Vol. 12 No. 3 (2006)
Publisher : Institut Pertanian Bogor (IPB University)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (97.566 KB)

Abstract

The objective of this research is to find out the early information of optimum light intensity and highest mycorrhizal colonization on natural Ramin seedling which it includes in semitolerant plant. The research was conducted in Ramin Natural Forest of Sungai Pelunjung Labai, Sanggau District, West Kalimantan for a year. The results of the research show that there are correlations between light intensity with mycorrhizal colonization. Ramin seedling which grown under the light intensity 3190 ? 9500 lux have high mycorrhizal colonization and their growth better than the other treatment. Meanwhile Ramin seedling which grown in closed area or in open area with light intensity less than 1670 lux and more than 10840 lux respectively have lower mycorrhizal colonization and their growth was lower.Key words: Ramón seedling  (G. bancnus), Light intensity and Mycorrhizal Fungi
IDENTIFICATION IDENTIFICATION OF FACTORS THAT INFLUENCE CARBON EMISSIONS IN TROPICAL PEATLAND Yahya, Vanda Julita; Sabiham, Supiandi; Pramudya, Bambang; Las, Irsal
Biospecies Vol 12 No 2 (2019): Biospecies Vol. 12 No. 2, July 2019
Publisher : Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (342.871 KB) | DOI: 10.22437/biospecies.v12i2.5319

Abstract

Penelitian bertujuan untuk mengetahui hubungan curah hujan terhadap tinggi muka air tanah. Serta pengaruh faktor kimia (kadar air gambut, pH) dan fisika (kapasitas tukar kation) terhadap emisi CO2. Penelitian menggunakan analisis matematika sederhana dengan menggunakan data sekunder. Dilakukan di perkebunan kelapa sawit di Kecamatan Koto Gasib,  Kabupaten Siak, Riau. Obyek yang diteliti tinggi muka air tanah, curah hujan dan faktor kimia-fisika lahan gambut di perkebunan kelapa sawit. Hasil penelitian menunjukan bahwa curah hujan dan hari hujan mempunyai hubungan linier dengan tinggi muka air tanah. Tinggi muka air tanah berkontribusi 71.48%  terhadap emisi GRK dan 28.52%  dipengaruhi faktor lain.  pH tanah gambut berkontribusi 91.41 %, terhadap emisi, 8.59% dipengaruhi faktor lain. Pengaruh  KTK terhadap emisi sebesar 88.66 %, dan 11.34% dipengaruhi faktor lain. Kandungan  air gambut  berpengaruh 96.19% terhadap emisi GRK, dan 3.81 % dipengaruhi faktor lain. Kesimpulan tinggi muka air tanah, kadar air, pH dan KTK berpengaruh sangat nyata terhadap emisi CO2.
DINAMIKA PENGGUNAAN LAHAN DAN PERKEMBANGAN PERKEBUNAN KELAPA SAWIT DI KABUPATEN KUBU RAYA DAN SANGGAU TAHUN 1990-2013 Hanjani, Safira Sukma; Ardiansyah, Muhammad; Nadalia, Desi; Sabiham, Supiandi
Jurnal Ilmu Tanah dan Lingkungan Vol 17 No 1 (2015): Jurnal Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (731.355 KB) | DOI: 10.29244/jitl.17.1.39-45

Abstract

Land use is the result of the intervention of humans to land in order to satisfy the needs of life the material and spiritual, and it changes in line with the growing number of people's activities in regulating economic, social and cultural life. Land use patterns in Kubu Raya and Sanggau regencies for three decades changed significantly. Forest land cover in the decade 1970s in Kubu Raya was 100%, then it was started to open until 1991 for smallholder plantations, large plantations and mix plantations. While, in the Sanggau regency, in the period of 1996-2005 land cover forest and agroforestry change decreased significantly, which was followed by increasing plantation. The objectives of this research were to identify land use/cover change in Kubu Raya and Sanggau regencies and to determine the development of oil palm plantation that occurred during the years 1990-2013. The spatial data land use/cover was obtained from the Ministry of Forestry, which were reexamined using Landsat satellite images with the Land Cover Classification System of the Ministry of Forestry (SNI 7654: 2010). During the 1990-2013 period, land-use change had occurred dynamically. Forest land use consistently decreased while non-forest land such as open land, shrubland, swamp shrubland, and oil palm plantation relatively increased. In general, oil palm plantation in Sanggau regency increase was largely derived from the conversion of non-forest land use. In the period 1990-2009 the increase of oil palm land use was from secondary swamp forest while in the period 2009-2013, that was from non-forest land. Keywords: Land use/cover change, oil palm plantation
POLISAKARIDA DAN STABILITAS AGREGAT TANAH MASAM YANG DIPERLAKUKAN DENGAN BRACHIARIA, MIKORIZA DAN KOMPOS JERAMI DIPERKAYA KALIUM Hafif, Bariot; Sabiham, Supiandi; Anas, Iswandi; Sutandi, Atang; Suyamto, Suyamto
Jurnal Ilmu Tanah dan Lingkungan Vol 13 No 1 (2011): Jurnal Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (433.041 KB) | DOI: 10.29244/jitl.13.1.1-7

Abstract

Stabilitas agregat menentukan kualitas tanah dan polisakarida adalah agen agregasi utama partikel tanah. Penelitian bertujuan mempelajari stabilitas agregat dan polisakarida sebagai agen agregasi partikel tanah masam yang diperlakukan dengan Brachiaria decumbens (BD), mikoriza dan kompos jerami diperkaya kalium di Kebun Percobaan Tegineneng BPTP Lampung. Penelitian ini menggunakan rancangan acak lengkap faktorial 3 faktor. Faktor 1, rumput Brachiaria decumbens, yaitu tanpa B. decumbens (B0) dan dengan baris B. decumbens (B1); faktor 2, mikoriza yaitu tanpa mikoriza (M0) dan dengan inokulasi mikoriza (M1); dan faktor 3, kompos jerami diperkaya kalium yaitu kompos 2 ton ha-1 masing-masing diperkaya KCl masing-masing 0 kg ha-1 (K0), 50 kg ha-1 (K50), 100 kg ha-1 (K100) dan 200 kg ha-1 (K200). Hasil penelitian menunjukkan perlakuan BD dan interaksi BD dan mikoriza mendorong fragmentasi agregat makro menjadi agregat meso dan mikro, namun stabilitas agregat dibawah pengaruh perlakuan tersebut lebih baik dibanding stabilitas agregat tanah kontrol. Inokulasi mikoriza memperbaiki stabilitas agregat makro 1-2 mm. Pengayaan kalium pada kompos jerami secara rata-rata tidak berpengaruh terhadap stabilitas agregat tetapi dalam interaksi dengan B. decumbens, pengayaan kompos jerami dengan 100 dan 200 kg KCl ha-1 berpengaruh cukup baik terhadap stabilitas agregat makro 2-5 mm. Polisakarida total di dalam agregat tanah pada perlakuan interaksi B. decumbens dan mikoriza nyata meningkat, demikian juga polisakarida bukan selulosa cenderung lebih baik. Perlakuan B. decumbens meningkatkan kadar polisakarida total di dalam agregat meso (0.25-1 mm) dan mikro (0.05-0.25 mm), sedangkan mikoriza meningkatkan polisakarida total dan polisakarida bukan selulosa di dalam agregat makro (> 1 mm).
IMPACT OF BRACHIARIA, ARBUSCULAR MYCORRHIZA, AND POTASSIUM ENRICHED RICE STRAW COMPOST ON ALUMINIUM, POTASSIUM AND STABILITY OF ACID SOIL AGGREGATES Hafifa, Bariot; Sabiham, Supiandi; Anas, Iswandi; Sutandi, Atang Sutandi; Suyamto, Suyamto
Indonesian Journal of Agricultural Science Vol 13, No 1 (2012): April 2012
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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

Abstract

Acid soil is commonly grown with cassava, which in general, tolerate low soil  fertility and aluminum (Al) toxicity. However, without any improvement efforts such soil will become worse. Intercropping cassava with Brachiaria decumbens (BD) which adapts to acid soil and tolerates low fertility soils as well as application of arbuscular mycorrhiza (AM) and organic matters are among the important efforts to rehabilitate this soil. The experiment was conducted to  examine the impact of BD, AM, and potassium (K) enriched rice straw compost on exchangeable Al, available K, and stability of soil aggregates. Experiment was arranged in a completely randomized design with three factors and three replications. The first factor was BD as cassava intercropping, the second factor was AM, and the third factor was 2 t ha-1 rice straw compost enriched with 0 kg, 50 kg, 100 kg, and 200 kg KCl ha-1. Brick pots (1 m length x 1 m width x 0.45 m depth) filled with Kanhapludult soil was used for growing cassava in which row of BD was planted at 60 cm from cassava stem. K-enriched rice straw compost and AM (10 g per stem) were applied around cassava stem at 2 and 12 days after planting, respectively. BD was cut every 30 days and the cutting was returned to the soil. Soil exchangeable Al was analyzed at 0, 3, 6 and 9 months after planting (MAP), while Al and K contents as well as aggregate stability were measured at 6 MAP. The results showed that planting BD decreased 33% exchangeable Al, which means that the root exudates of this grass was effective in detoxifying Al3+. Treatment of BD and/or in combination with AM was effective in preserving K added to the soil, increasing total polysaccharides, and improving soil aggregate stability. This indicated that planting BD and applying AM and Kenriched rice straw compost improved acid soil fertility, and therefore can be recommended in cassava cultivation.
UJI AKTIVITAS LAKASE DAN SELULASE PADA LIGNOSELULOSA GAMBUT DENGAN BERBAGAI KADAR AIR Mulyawan, Ronny; Indriyati, Lilik Tri; Widiastuti, Happy; Sabiham, Supiandi
Jurnal Ilmu Pertanian Indonesia Vol. 24 No. 1 (2019): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (493.74 KB) | DOI: 10.18343/jipi.24.1.20

Abstract

The degradation of lignocellulose as the main constituents of peat is catalyzed by enzymes such as laccase or cellulase. The purpose of this research was to study the pattern of laccase and cellulase activities on sterile and non-sterile peat materials at three different water contents (125-175, 225-275, and 325-375%). The peat soil used was collected from oil palm rhizosphere in Riau Province. This research used the descriptive method by comparing the mean values between treatments. The results showed that enzymes activities on sterile and non-sterile peat added with laccase or cellulase were higher compared to those without enzyme addition. The highest laccase activity was at the first day of incubation, while that for selulase was at the 10th days of incubation. The activity of enzyme then decreased with the increase in the respected incubation time. The difference in decreasing of lignin and cellulose content at 125-175% water content was higher than at the other water contents. The decreases in lignin and cellulose contents were higher by addition of respected enzymes both in sterile and non-sterile peat. It could be concluded that at higher water content, laccase and cellulase activities were depressed both on sterile and non sterile peat, especially after the addition of enzyme.
EFEK PEMBUKAAN LAHAN TERHADAP KARAKTERISTIK BIOFISIK GAMBUT PADA PERKEBUNAN KELAPA SAWIT DI KABUPATEN BENGKALIS Suwondo, Suwondo; Sabiham, Supiandi; Sumardjo, Sumardjo; Paramudya, Bambang
Jurnal Natur Indonesia Vol 14, No 1 (2012)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (968.06 KB) | DOI: 10.31258/jnat.14.1.143-149

Abstract

Oil palm plantations at peatland are faced with problems of land degraded, low productivity and produced to green house gas (GRG) emission.The objectives of this study were to land clearing effect of peatlands and to identified factors that affect the peatlands in the biophysicalcharacteristics. This study was conducted on District Bengkalis-Riau at marine and brakish peat. The data was collected using field survey anddocumentation. The descriptive analysis was used to determine biophysical characteristics and linier regresion was used to corelation performimportant factors. The research results showed that the biophysical characteristics of peatland experienced changes in the horizon profile,peat thickness, decomposition level, moisture content, ash content, pH, C-organic and biomass. The secondary peat swamp forest ofbiophysical characteristics have to different in the horizon profile, peat thickness, decomposition level, moisture content, ash content, pH,C-organic and biomass compared with marine and brackish peat.
DINAMIKA HARA GAMBUT PADA PENGGUNAAN LAHAN HUTAN SEKUNDER, SEMAK DAN KEBUN KELAPA SAWIT Pulunggono, Heru Bagus; Anwar, Syaiful; Mulyanto, Budi; Sabiham, Supiandi
Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Vol. 9 No. 3 (2019): Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan
Publisher : Graduate School Bogor Agricultural University (SPs IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jpsl.9.3.692-699

Abstract

Peat nutrient dynamics research was intended to study the characteristics and distribution of macro nutrients in peat water and peat in secondary forests, shrubs and oil palm plantations. This research was conducted with purposive sampling method. Observations on oil palm plantations were carried out at three ages of oil palm (5, 12, and 16 years). Secondary forest and shrub peatlands were used as a comparison. Sampling of peat water and peat was carried out during the rainy and dry season, at four distances from the collection drain (25, 50, 75, and 150 m). The results showed that nutrient levels in peat water during the dry season were greater than the wet season. The status of peat water and peat nutrients in secondary forests and shrubs is relatively the same as that of oil palm plantations that were fertilized. Seasonal, land use and distance from the collection channel differences did not have a major influence on the distribution and characteristics of macro nutrients on peat. The macro nutrients content of peat water and peat, however, showed an increase with the distance from the collection channel.