Found 17 Documents

Soil Factor Influencing Mangrove Forest Community Occurence in Talidendang Besar, Riau

MEDIA KONSERVASI Vol 3, No 3 (1991): Media Konservasi

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This study was undertaken to investigate the soils factors influencing the mangrove forest community occurrence in Talidendang Besar, Riau. One sample plot of 50 m x 50 m was established at hguiera panlifora community. B. se~ngulacommunity, and mixed B. scxangula - Nypa fnrticans community to explore its vegetation composition and soil characteristics. The soil factors such as pII, EC (electrical conductivity), 70 K. ´% Na, C-organic, N-total, NH4 (ammonia), and CEC (cation exchange capacity) were regarded as soil factors to be important in influencing the occurrence pattern of mangrove forest community in Talidendang Besar. hau. Keywords: mangrove, Talidendang Besar, Riau, forest communig.

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))

Publisher : Bogor Agricultural University

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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

Fluks Metana dan Karakteristik Tanah pada Beberapa Macam Sistem Budidaya

Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 34, No 3 (2006): Jurnal Agronomi Indonesia
Publisher : Bogor Agricultural University

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Methane (CH4) is an important greenhouse gas that has a high heat trapping capacity thus potentially contribute to the global-warming.  Agriculture is considered among the responsible emission sources of CH4. Relationship among soil characteristics, soil microbes, and CH4 flux is very important in understanding the mechanism involved in the mitigation effects of certain agriculture practices. Results of this research showed that rice field produced the highest CH4 flux (7.4976 ± 0.5299 mg CH4-C m-2 h-1, n=3), while vegetable, sweet potato, yam bean and corn cropping produced lower CH4 flux (-0.7708 ± 0.6434 to 0.4605 ± 0.5255 mg CH4-C m-2 h-1, n=3). Nitrifier population among cropping systems was 3.13x103 to 3.17x104  MPN g-1 soil (dry weight), while denitrifier population was 3.77x103 to 1.17x105 MPN g-1 soil (dry weight).  There were no specific dominance proportion of nitrosomonas, nitrobacter, denitrifier and total propagule among cropping systems. The CH4 flux had highly correlation to soil water content (r = 0.951), soil pH (r = 0.852) and soil Eh (r = -0.982). Denitrifier had significantly correlation to soil pH (r = -0.635) and soil ammonium content (r =  -0.681).   Key words :  CH4 flux, cropping system, soil characteristic, soil microbes

Uji Aktivitas Lakase dan Selulase pada Lignoselulosa Gambut dengan Berbagai Kadar Air

Jurnal Ilmu Pertanian Indonesia Vol 24, No 1 (2019): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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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.


Indonesian Journal of Agricultural Science Vol 13, No 1 (2012): April 2012
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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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.

Fosil Polen Mangrove Berumur Pliosen Dari Formasi Tapak Daerah Kedung Randu, Banyumas

Bioma Vol. 14, No.1, Tahun 2012
Publisher : Bioma

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Thirty sediment samples had been taken from the Tapak Formation of Kedung Randu areas, Banyumas, to reconstruct the diversity of mangrove flora from this area the past. This samples were processed for palynological slides used standard palynology preparation method. The microscopic identification of palynomorphs were done to identify taxa of paleoflora. Fifty-six types of pollen and spores fossils had been identified and 22 types were mangrove pollen-spores fossils. This fossils could be grouped into major mangrove (Zonocostites ramonae/Rhizophora type, Spinizonocolpites echinatus/Nypa fruticans, Florschuetzia levipoli/Soneratia caseolaris and Avicennia type); group of minor mangrove (Retitricolporites sp./Excoecaria sp., Discoidites novaguenensis/Brownlowia type, Camptostemon and Acrostichum aureum), and a group of plant associations (Retitricolporites equatoralis/Calophyllum type, Dicolpopollis sp./Calamus type, Racemonocolpites sp./Oncosperma, Marginipollis concinus/Barringtonia, Pandaniidites sp. /Pandanus, Terminalia catappa, Ilexpollenites sp./Ilex, Stellatopollis sp./Croton type, Acanthaceae type, Cyperaceaepollis/Cyperaceae, Podocarpidites/Podocarpus, Aglaia type, Haloragacidites/ Casuarina and Verrucatosporites usmensis/Stenochlaena palustris. Stenochlaeniidites papuanus and Podocarpus imbricatus were found in the samples. Tapak Formation was included in the last section of the Podocarpus imbricatus/Dacrycarpidites australiensis Zone of Java Palynological Zonation, and this formation was in the age of Late Pliocene towards Pleistocene.   Key word: Tapak Formation; major-minor-plant associations of mangrove; palynological zonation


Jurnal Ilmu Tanah dan Lingkungan Vol 13, No 1 (2011): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

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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).

Sustainability Index of Rice Field for Supporting Spatial Planning (Case Study in Jember District, East Java)

Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 32 (2010): Desember 2010
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

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Rice Field agriculture in Jember district is a main sector due to its contribution to rice production in this region. The objective of this study is to determine the rice field sustainability index based on agro-ecosystem zone and to formulate policy alternatives for supporting the spatial planning in achieving sustainable rice field agriculture. The study used the primary andsecondary data which include biophysical environment, economy, social and culture. The data analysis used GIS (Geographic Information System) modelbase, factor analysis, and AHP (Analytical Hierarchy Process). The results showed that the sustainability index of the rice field agro-ecosystem zones were different. The threats of the rice field sustainability were causedby the main indicators of the biophysical environment, economy, social, and culture such as water availability, soil nutrients of Carbon organic content, Nitrogen, and Phosphor-available, profit, fertilizer access, land conversion, land ownership and fragmentation, farmer education, and age of farmer. To overcome those threats, the policy consideration was more dominantly determined by the biophysical factor rather than that of theeconomy, social, and culture. The implementation of the policy tohandle the threats needs to be coordinated among the stakeholders, considering that the rice field resource can be categorized into a common pool resource.

Farmers Adaptation of Post Conversion Land in Subang District, West Java, Indonesia

WACANA, Jurnal Sosial dan Humaniora Vol 21, No 1 (2018)
Publisher : Pascasarjana Universitas Brawijaya

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Subang Regency has an important role as the rice supplier area. As one of the rice production centers in Indonesia, rice farmers address rice fields as an asset or resource. As an asset, farmers conduct rice farming activities in the rice fields with economical orientation and rely on their food source mainly from the rice production. Conversions of paddy fields have changed the socioeconomic balancing amongst the farmers. They responded to the changes by adapting to new conditions, thus farmers’ post-conversion responses are an interesting aspect to study. This research aimed to understand the rice farmers adaptations, which was involved 15 key informants using in-dept interviews and purposive sampling method of 164 respondents. The analysis of the interview results used the concept of adaptation based on objectives, timing, and then strengthened with relevant documents for the study area. This study found, that: 1) farmers tried to make adjustments in using the compensation funds, livelihood, professions, farming, and household needs; 2) farmers’ adaptation are their way to earn the income and maintain their livelihood, and 3) some farmers firmly stated that their adaptations have made newly more prosperous conditions for them.

Soil Leaching of on Particular Condition of Redox Potential by Insitu Water Source in Balandean South Kalimantan

Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 32 (2010): Desember 2010
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

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The experiment was conducted in Soil Fertility Laboratory, Agriculture Faculty, IPB from March to July 2009. The treatment was arranged in Factorial Completely Randomized Design with two factors i.e. insitu water source and condition of redox potential. Water source for leaching was fresh water, peat water, and brackish water. The condition of redox potential consisted of: -100 ± 25, 0 ± 25, 100 ± 25, 200 ± 25, 300 ± 25, and 400 ± 25 mV. In leachate water on redox potential as 400 mV, the concentration of Fe2+, total Fe, SO42-, and Al were 376.76, 554.44, 961.55, and 180 ppm respectively (at first week) decreased into 227.20, 312.22, 506.86, and 44 ppm (at eight week). Whereas in leachate water that leaching by peat water, at the first week concentration of Fe2+, total Fe, SO42-, and Al were 412.50, 493.11, 823.57, and 110.50 ppm decreased into 253.65, 302.50, 463.60, and 29.50 ppm at the eighth week. After leaching as long as eighth weeks, concentration of Fe2+, total Fe, SO42-, and Al in soil material decreased from 578.26 ppm, 3680 ppm, 1011.26 ppm, and 18.66 me 100g-1 to 350.26 ppm, 3095 ppm, 376.76 ppm, and 11.79 me 100g-1.