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Journal of Tropical Soils
Published by Universitas Lampung
ISSN : 0852257X     EISSN : 20866682     DOI : http://dx.doi.org/10.5400/jts.v25i1
Core Subject : Agriculture, Social,
Agriculture, Biological Sciences & Forestry Environmental Science
Journal of Tropical Soils (JTS) publishes all aspects in the original research of soil science (soil physic and soil conservation, soil mineralogy, soil chemistry and soil fertility, soil biology and soil biochemical, soil genesis and classification, land survey and land evaluation, land development and management environmental), and related subjects in which using soil from tropical areas.
Arjuna Subject : Ilmu Lingkungan (semua ketegori) - Konservasi Alam dan Lahan
Articles 817 Documents
 16   17   18   19   20 
Nitrogen Dynamics and Nitrate Leaching in Intensive Vegetable Rotations in Highlands of Central Java, Indonesia Ladiyani Retno Widowati; Stefaan De Neve
JOURNAL OF TROPICAL SOILS Vol 21, No 2: May 2016
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2016.v21i2.67-78

Abstract

High rainfall intensity is major factor governing leaching process, where leaching is often the most important process of N loss from the field and lead to agricultural environmental pollution. In order to measure the movement of mineral-N in soil profile, a field research had been conducted in two sites of center vegetable farming area with six farmer cooperators in Central Java, Indonesia. Regular soil sampling was done from Improve Practice (IP) and Farmer Practice (FP) treatment for three planting seasons during 2007. Almost all treatments FP applied higher rate of N fertilizer compare to IP, but it was not reflected in N profile.  Comparison of predicted and measured mineral N content was simulated using Burns α  model, then the closeness of the estimation and measured calculated using Coefficient of Residual Mass (CRM) calculation as an indicator with 0 as ideal value.  Out of 9 measurements of IP and FP treatment, eight and seven measurements had negative CRM  representinga slight overestimation. The NO3-N loss estimated using the Burns α model for IP and FP was in average of 67% for IP and  71% for FP of total N fertilizer added or 67% for IP and 76% for FP of total-N surplus, respectively. The calculation of potential nitrate concentration (PNC) at 1 m soil depth at the end of the third season showed a high concentration with significant different of IP and FP having mean value of 59.8 and 82.5 mg N L-1. From the gathered data it was obvious that over N fertilization had negative effect to agricultural environment.
Relationship between Organic-C and Available-P Due to Tidal Fluctuation in South Kalimantan Fadly Hairannoor Yusran
JOURNAL OF TROPICAL SOILS Vol 17, No 3: September 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i3.253-257

Abstract

Tidal fluctuation creates different soil chemical properties which is totally deviate from normal circumstances.  Organic matter decomposition occurs with limited O2 supply, hence disturbing Carbon cycle which has a central role in the process and nutrient mineralisation.  The research aimed was  to describe the relationship between organic-C and available-P due to tidal fluctuation in South Kalimantan.  Ten undisturbed composite samples were collected in top-soil and sub-soil.  Results showed that there was no direct effect from organic-C in P availability as in other mineral soils.  However, there was an indication that the relationship was influenced by maturing process of the soil.  In other words, the relationship between organic-C and available-P was typical for every type of swampland and was not related to the tidal fluctuationKeywords: Available-P, organic-C, P-transformation, tidal water fluctuation [How to Cite: Yusran FH. 2012. Relationship between Organic-C and Available-P Due to Tidal Fluctuation in South Kalimantan. J Trop Soils 17 (3) : 253-257. doi: 10.5400/jts.2012.17.3.253] [Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.253] 
Changes in Some Soil Chemical Properties of Ultisol Applied by Mulch from Empty Fruit Bunches in an Oil Palm Plantation Dedik Budianta; Ali Yasmin Adam Wiralaga; Wahana Lestari
JOURNAL OF TROPICAL SOILS Vol 15, No 2: May 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i2.111-118

Abstract

Changes in Some Soil Chemical Properties of Ultisol Applied by Mulch from Empty Fruit Bunches in an Oil Palm Plantation (D Budianta, AYA Wiralaga, and W Lestari):  Objective of this research was to study the effect of empty fruit bunches (EFB) applied as mulching on some soil chemical properties of Ultisol in an Oil Palm Plantation. This field experiment was conducted in PT. Sampoerna Agro Tbk Plantation Mesuji, Ogan Komering Ilir of South Sumatra Province at blocks of 22/A, 23/B, 27/C, 33/, 12/A, 12/B, 24/D, 12/C, 00/C, 24/A, 24/B, 10/B, 02/C, 02/D, 11/C, 11/D, 10/A, 10/C, 11/A, and 24/C. The treatment was EFB dosage which are without EFB (control), 40 Mg ha-1 of  EFB applied only once for a year, 80 Mg ha-1 of EFB applied twice for 2 years, 120 Mg EFB/ha applied three times for 3 years, and 160 Mg ha-1 of EFB applied four times for 4 years. The rate of EFB application was 40 Mg ha-1 per year. Every treatment was replicated 4 times, thus total of experiment was 20 units. Soil samples were taken in two differences of deepness which were 0-20 cm and 20-40 cm, respectively. Soil variables observed were soil pH, organic C, cation exchange capacity (CEC), total N, P availability, exchangeable K and Mg, Al and Fe. The results showed that application of EFB had significantly effect on some soil chemical properties such as soil pH and Mg exchangeable Mg for 0-20 cm and total N for 20-40 cm deepness. Meanwhile application of EFB did not have siginificant effects on total organic C, CEC, P-Bray I, exchangeable K, exchangeabile Al and Fe.  It was also shown that some soil chemical properties were generally higher in top soil layer than sub soil layer, except for CEC, P and  exchangeable Al.
The Influence of Phosphate Fertilizer and Plant Growth Regulators on the Growth and Yield of Ratoon Rice (Oryza sativa L.) Grown on Swampland Siti Nurul Aidil Fitri; Siti Masreah Bernas; Erizal Sodikin; Andi Wijaya; Ferra Apriadi
JOURNAL OF TROPICAL SOILS Vol 23, No 2: May 2018
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2018.v23i2.73-80

Abstract

This research aimed to study the influence of phosphate fertilizer and plant growth regulator applications on the growth and yield of ratoon rice grown on swampland. The research was conducted in September 2016 to January 2017 at the greenhouse of Department of Soil Science, Faculty of Agriculture, Sriwijaya University. Soil characteristics were analyzed in the Laboratory of Chemistry, Biology and Soil Fertility, Department of Soil Science, Faculty of Agriculture, Sriwijaya University. The experiment was arranged in a factorial Completely Randomized Design.  The first factor was the phospate fertilizer dosages, i.e. 150 kg ha-1 (P1), 200 kg ha-1 (P2), 250 kg ha-1 (P3). The second factor was the plant growth regulator treatments, consisting of control (Z0), Cytokinin 20 ppm (Z1), Gibberellin 60 ppm (Z3). The results showed that the application of P fertilizer did not affect the yield and growth of ratoon rice. However, the application of Plant Growth Regulators resulted in a significant effect on the growth and yield of ratoon rice. The application of Plant Growth Regulator of Gibberellin with the dosage of 60 ppm was able to increase the percentage of filled grains (84.93%), decrease the percentage of empty grains (15.07%), increase the weight of 100 grains (3.63 g) and increase the dry weight of  milled grains (7.80 Mg ha-1). It is suggested that the treatment resulted in better plant growth and yield obtained in the current study might be recommended for ratoon cultivation in swampland.
Changes of Soil Chemical Properties during Rice Straw Decomposition in Different Types of Acid Sulphate Soils Anna Hairani; Ani Susilawati
JOURNAL OF TROPICAL SOILS Vol 18, No 2: May 2013
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2013.v18i2.99-103

Abstract

Organic residues often exhibit different physico-chemical properties and affect the soil ecosystem in different ways. Hence, the study of their impact on soil is essential to benefit from their potential as amendments and to avoid adverse environmental effects. It is required to study the role of rice straw in the changes of soil properties during decomposition processes in the rice field. The research was conducted on potential acid sulphate soil (PASS) and actual acid sulphate soil (AASS) in the glass house. Soil pH, Fe2+, organic-Fe, total N and available P were observed at 2, 4, 6 and 8 weeks after planting (WAP). The result showed that rice straw application : (1) decreased soil pH of PASS and increase soil pH of AASS; (2) tended to increase Fe2+ both in PASS and AASS; (3) stimulated the organic-Fe concentration in AASS was higher than organic-Fe concentration in PASS; (4) had no different effect in total N and decreased P concentration in the both of soil during observation. P concentration on PASS was lower than on AASS.Keywords: Decomposition, rice straw, soil chemical properties, soil type[How to Cite: Hairani A and A Susilawati. 2013.Changes of Soil Chemical Properties during Rice Straw Decomposition in Different Types of Acid Sulphate Soils. J Trop Soils 18 (2): 99-103. Doi: 10.5400/jts.2013.18.2.99]REFERENCESBalai Penelitian Tanah. 2005. Analisis Kimia Tanah, Tanaman, Air dan Pupuk.  Badan Penelitian dan Pengembangan Pertanian. Departemen Pertanian.  Bogor. p: 136 (in Indonesian).Banach AM, K Banach, RCJH Peters,  RHM Jansen, EJW Visser, Z Stepniewska, JGM Roelofs and LPM Lamers.  2009.  Effects of long-term flooding on biogeochemistry and vegetation development in floodplains; a mesocosm experiment to study interacting effects of land use and water quality.  Biogeosciences  6: 1325-1339. doi:10.5194/bg-6-1325-2009.Bonneville S.  2005.  Kinetics of Microbial Fe (III) Oxyhydroxide Reduction : The Role of Mineral Properties.  [Dissertation].  Department of Earth Sciences-Geochemistry, Faculty of Geosciences, Utrecht University. The Netherlands. 117 p.Cayuela ML, T Sinicco and C Mondini.  2009.  Mineralization dynamics and biochemical properties during initial decomposition of plant and animal residues in soil. App Soil Ecol  41: 118 -127.De-Campos AB, AL Mamedov and C Huang. 2009. Short-term reducing conditions decrease soil aggregation. Soil Sci Soc Am J  73: 550-559.Dent D. 1986. Acid Sulphate Soils: A Baseline for Research and Development. International Land Reclamation Institute Pub. 39. Wageningen, The Netherlands. 204 p.Dobermann A and T Fairhurst.  2000.  Rice: Nutrient Disorders and Nutrient Management.  International Rice Research Institute.  Makati city, The Fhillipines.  191 p. Fahmi A, B Radjagukguk and BH Purwanto.  2009.  Kelarutan posfat dan ferro pada tanah sulfat masam yang diberi bahan organik jerami padi.  J Tanah Trop 14: 119 -125 (in Indonesian).Fahmi A. 2010.  Pengaruh pemberian jerami padi terhadap pertumbuhan tanaman padi (Oryza sativa ) di tanah sulfat masam.  J Berita Biol 10:  7-14 (in Indonesian). Havlin JL, JD Beaton, SL Tisdale and WL Nelson. 2005. Soil Fertility and Fertilizers, an introduction to nutrient management. 7th edition. Prentice Hall. 515 p.Indrayati L and A  Jumberi. 2002.  Pengelolaan jerami padi pada pertanaman padi di lahan pasang surut sulfat masam.  In: Pengelolaan Tanaman Pangan Lahan Rawa.  Badan Penelitian dan Pengembangan Pertanian, Puslitbang Tanaman Pangan, Bogor. Kirk G.  2004.  The Biogeochemistry of Submerged Soils. John Willey and Sons. Chicester, England.  291 p.Kongchum M.  2005.  Effect of  Plant Residue and Water Management Practices on Soil Redox Chemistry, Methane Emission and Rice Productivity.   [Dissertation].  Graduate Faculty of the Louisiana State University.  USA.  201 pKyuma K.  2004.  Paddy Soil Science.  Kyoto University Press dan Trans Pacific Press.  Melbourne.  Australia. 279 p.Liang X, J Liu, Y Chen, H Li, Y Ye, Z Nie, M Su and Z Xu.  2010.  Effect of pH on the release of soil colloidal phosphorus.  J Soils Sediments 10: 1548-1556.Lindsay WL. 1979.  Chemical Equilibria in Soils. John Willey & Sons. New York. 449 p.Liu C, M Chen and F Li. 2010. Fe(III) reduction in soils from South China. In: RJ Gilkes and N Prakongkep (eds). Soil Solutions for a Changing World. Soil minerals and contaminants, 19th World Congress of Soil Science. Brisbane, Australia, pp.70-73.McIntyre RES, MA Adams, DJ Ford and PF Grierson.  2009.  Rewetting and litter addition influence mineralization and microbial communities in soils from a semi-arid intermittent stream.  Soil Biol Biochem 41: 92-101.Morris AJ. 2011. Phosphate Binding to Fe and Al in Organic Matter as Affected by Redox Potential and pH. [Dissertation]. Soil Science, North Carolina  State University, Raleigh, North Carolina, USA. 229 p.Olomu MO, GJ Racz and CM Cho.  1973.  Effect of flooding on the Eh, pH, and concentrations of Fe and Mn in several manitoba soils.  Soil Sci Soc Am J  37: 220 -224.Ponnamperuma FN. 1984.  Effects of flooding on soils.  In: T Kozlawski (ed).  Flooding and Plant Growth: Physical Ecology. A Series Monographs, Text and Treatises.  Academic Press Inc.  Harcourt Brace Javanovich Publisher, USA, pp. 10-45. Reddy KR and RD Delaune.  2008. The Biogeochemistry of Wetland; Science and Application. CRC Press.  New York.Rukhsana F, C Butterly, J Baldock and C Tang.  2010. Model carbon compounds differ in their effects on pH change of soils with different initial pH. In: RJ Gilkes and N Prakongkep (eds). 19th World Congress of Soil Science, Soil Solutions for a Changing World, 1 – 6 August 2010, Brisbane, Australia,  pp. 160-163.Syahrawat KL.  2006.  Organic matter and mineralizable nitrogen relationships in wetland rice soils.  Commun Soil Sci Plant Anal 37: 787-796. Wagai R and LM Mayer.  2007.  Sorptive stabilization of organik matter in soils by hydrous iron oxides.  Geochim Cosmochim Act 71: 25-35.Watanabe I.  1984.  Anaerobic decomposition of organic matter in flooded rice soils. In: Organic Matter and Rice. Intenational Rice Research Institute.  Los Banos Laguna, Philippines,  pp. 237-258.Wickham TH and VP Singh. 1978.  Water movement through wet soils. Soil and Rice.  International Rice Research Institute. Los Baños, Philippines, pp. 337- 358.
Landform Classification which Alighted from Digital Elevation Models: Case in Citarum Watershed, Cilalawi Sub Watershed, West Java . Salwati; Busyra Buyung Saidi
JOURNAL OF TROPICAL SOILS Vol 13, No 2: May 2008
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2008.v13i2.139-144

Abstract

Application of GIS technology (Geographic Information System), that is Digital Elevation Models (DEMs) for the analysis of  landform or slope have been conducted in the Citarum watershed, Purwakarta West Java Province from August until November 2003. Research aim to make landform classification of DEMs use classification of ISODATA and   to evaluate the quality of landform classification which alighted from DEMs. To reach the target have been made DEMs, is later then degraded to become map set of regional form. DEMS made from contour map scale 1 : 25.000 with inteval of 12.5 m use Arcview version 2.65 with resolution of 25 m, and slope classification made software of ER Mapper. Field observation conducted for validation result of classification. Result of research indicate that wave landform (slope 8-15%) and hilly (slope 15-30%) in sub watershed of Cilalawi is DEMs have lower level class of fact in the field. While set of regional form level of (slope < 3%), waving (slope 3-8%) and have mount (slope > 30%) in sub of DAS Cilalawi have bevel class which almost is equal to fact in the field. Result of the  research indicated that map of landform or alighted from slope is DEMs not entirely as according to situation in fact of the field. Interconnected the mentioned sliver with quality map of used contour. Thereby verification in field is absolutely needed.
Upaya Peningkatan Produksi Kelapa Sawit melalui Penerapan Teknik Konservasi Tanah dan Air Kukuh Murtilaksono; Witjaksana Darmosarkoro; Edy Sigit Sutarta; Hasril Hasan Siregar; Yayat Hidayat
JOURNAL OF TROPICAL SOILS Vol 14, No 2: May 2009
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2009.v14i2.135-142

Abstract

Effort to Increase Oil Palm Production through Application Technique of Soil and Water Conservation (K. Murtilaksono, W. Darmosarkoro, E.S. Sutarta, H. H. Siregar, and Y. Hidayat): The study was carried out at block 375, 415, and 414 (block 1, 2, and 3) Afdeling III, Mangement Unit of Rejosari, PT Perkebunan Nusantara VII, Lampung from June 2005 until December 2007.  Objective of the study is to examine the effect of soil and water conservation measurement, namely bund terrace and silt pit that are combined with retarded-water hole on production of oil palm. Sampled trees of each block were randomly selected as much as 36 trees.  Parameters of vegetative growth (additional new frond, total of frond, number of new bunch), production (number of bunch, fresh fruit bunch (TBS)), and average of bunch weigh (RBT) were observed and recorded every two weeks.  Production of palm oil of each block was also recorded every harvesting schedule of Afdeling.  Tabular data were analyzed descriptively by logical comparison among the blocks as result of application of bund terrace and silt pit.  Although the data of sampled trees were erratic, bund terrace and silt pit generally increasing number of frond, number of bunch, average of bunch weight, and fresh fruit bunch.  Bund terrace gived the highest production of TBS (25.2 t ha-1) compared to silt pit application (23.6 t ha-1), and it has better effect on TBS than block control (20.8 t ha-1).  Aside from that, RBT is the highest (21 kg) at bund terrace block compared to silt pit block (20 kg) and control block (19 kg).
Population and Distribution of Some Soil MesoFauna in the Inactive Tailing Deposition Areas of Freeport Indonesia, Timika-Papua Irnanda Aiko Fifi Djuuna
JOURNAL OF TROPICAL SOILS Vol 18, No 3: September 2013
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2013.v18i3.225-229

Abstract

Soil fauna has played an important role in ecosystem functioning, especially as ecosystem engineers which contribute to soil fertility in tropical environment.  A tailing deposition area is  one habitat that has several types of soil fauna to live and growth as well as involves in the decomposition of organic matter. The objective of this study was to examine the number and distribution of soil fauna in the tailing area of Freeport Indonesia Mining and Gold Company, Timika.  The study was located in some inactive tailing deposition areas in between Double Levee  of the lowland area of ModADA (Modification Ajkwa Deposition Areas).  Samples were taken from inactive tailing as 198 of ModADA for soil and soil fauna, the Kuadran Method was used  to collecting soil fauna on the soil surface and in the soil.  There were 17 types/ordo of soil fauna in the study area and the highest number was a group of ants (Hymenoptera/Formicidae).  Population density (PD) and relative density (RD) of soil fauna (Formicidae) ranged from 0.03-2.41 Individu m-2 (PD) and 0.07-6.50% (RD).  Both PD and RD were likely to increase as the number of soil fauna increase.  The distribution of most soil fauna were found as a clump, while Pulmonata (Gastropods) were distributed normally in the tailing areas.  The number and types (ordo) of these soil fauna had showed that inactive tailing deposition areas were considered a good habitat for soil fauna.Key words: Distribution, population, soil fauna, tailing[How to Cite: Djuuna IAF. 2013. Population and Distribution of Some Soil MesoFauna in the Inactive Tailing Deposition Areas of Freeport Indonesia, Timika-Papua. J Trop Soils 18 (3): 225-229. Doi: 10.5400/jts.2013.18.3.225][Permalink/DOI: www.dx.doi.org/10.5400/jts.2013.18.3.225]REFERENCESAdianto.1993.Agricultural Biology of Animal Manure, Organic Fertilizer and Insecticides. Bandung: Penerbit Alumni (in Indonesian).Anderson JM and JS Ingram. 1993. Tropical soil biology and fertility: A Handbook of Methods, 2nd ed. CAB International. Wallingford. UK, 221 pp.Battigelli JP. 2011. Exploring the World Beneath your Feet – Soil Mesofauna as Potential Biological Indicators of Success in Reclaimed Soils.  Proceedings - Tailings and Mine Waste Vancouver, BC.Behan-Pelletier VM. 1999.Oribatid mite biodiversity in agroecosystems: role as bioindicators. Agric  Ecosyst Environ 74: 411-423. Brussard L. 1998. Soil fauna, guilds, functional groupsand ecosystem processes. Appl Soil Ecol 9: 123-136.De Ruiter PC, B Griffiths and JC Moore. 2002. Biodiversity and Stability in Soil Ecosystems: Patterns, Processes and the Effects of Disturbance. In: M Loreau, S Naeem and P Inchausti (eds.). Biodiversity and Ecosystem Functioning: a current synthesis. Oxford University Press, Oxford, UK, pp. 102-113.Djuuna IAF, H Siby and S Baan.2008. Population and Distribution of Soil Fauna on the Below ground of Forest Trees in Gunung Meja Forest Areas of Manokwari.  J Beccariana 1: 6.  Fitter AH, CA Gilligan, K Holling Worth, A Kleczkowski, RM Twyman, JW Pitchford and the Members of the Nerc Soil Biodiverrsity Programme. 2005. Biodiversity and ecosystem function in soil. Funct Ecol 19: 369-377.Hanafiah KA,  I Anas, A Napoleon and N Gofar. 2005. Biologi Tanah : Ekologi dan Makrobiologi Tanah.  Edisi 1, PT Raja Grafindo Persada. Jakarta,165 pp. (in Indonesian). Picaud F and DP Petit. 2007.Primary succession of Orthoptera on mine tailings: role of vegetation.  Ann de la Soc Entomol de France 43: 69-79Rusek J. 1998. Biodiversity of Collembola and their functional role in the ecosystem. Biodiver Conserv 7: 1207-1219.Sackett TE, AT Classen, and NJ Sanders. 2010.Linking soil food web structure to above and below ground ecosystem processes: ameta-analysis. Oikos 119: 1984-1992.Shao Y, W Zhang, J Shen, L Zhou,  H Xia, W Shu, H  Ferris  and S Fu.  2008.  Nematodes as indicators of soil recovery in tailings of a lead/zinc mine.  Soil Biol Biochem 40: 2040-2046.Suin NM. 2003.  The Ecology of Soil Fauna.  Penerbit Bumi Aksara Jakarta (in Indonesian).Sugiyarto. 2000.The Biodiversity of soil macro fauna on the different age of sengon in RPH Jatirejo, Kabupaten Kediri. Biodiversitas 1: 47-53. (in Indonesian).Sugiyarto, M Pujo and Nursihmiati.  2001. Relationship between the Soil Meso Fauna Biodiversity and Belowground Vegetation in Some Forest Trees of Jobolarangan. Biodiversitas 2: 140-145 (in Indonesian)Wallwork JA.   1970. Ecology of Soil Animals. London: Mc.Graw-Hill. 283 pp.Wallwork JA.1976.  The Distribution and Diversity of Soil Fauna.  Academic Press Inc. (London). 355 pp.
Kandungan Nitrogen dan Bobot Biji Kentang yang Diberi Pupuk Organik Difermentasi, Azospirillum Sp., dan Pupuk Nitrogen di Cisarua, Lembang, Jawa Barat . Nurmayulis; . Maryati
JOURNAL OF TROPICAL SOILS Vol 13, No 3: September 2008
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2008.v13i3.217-224

Abstract

A research was conducted to study response of potato (Solanum tuberosum L.) plant to the application of  fermented organic matter (‘porasi’) (0, 7.5, 15.0, and 22.5 t ha-1), without or with inoculation of Azospirillum sp., and N fertilizer (0, 86, 172, and 258 kg ha-1 N) and also to determine optimal rate of application of ‘porasi’ and N fertilizer without or with inoculant Azospirillum sp.  Field experiments were carried out in Cisarua, Lembang West Java, from June 2003 to Nov. 2003.  The experiments were done in a Randomized Block Design of factorial pattern of three factors, were replicated three times.  Results of the experiments showed that: (1) N contents were higher as rates of ‘porasi’ and N fertilizer increased and with inoculation of Azospirillum sp.,  whereas the highest N concentration was obtained due to application of 22.5 t ha-1 ‘porasi’ with inoculation of  Azospirillum sp. and application of N fertilizer of 258 kg ha-1, and (2) the optimum rate of  ‘porasi’ and N fertilizer without inoculation of Azospirillum sp. was 15.287 t ha-1 and 228.519 kg ha-1 N, respectively, to obtain maximum yield of 6.028 kg per plot or 25.117 t ha-1, whereas with inoculation of  Azospirillum sp. the optimum rate of ‘porasi’ and N fertilizer was 16.464 t ha-1 and 190.110 kg ha-1 N,  respectively, with maximum yield of 6.493  kg per plot or 27.054  t ha-1.
Humic Acid and Water Management to Decrease Ferro (Fe2+) Solution and Increase Productivity of Established New Rice Field . Herviyanti; Teguh Budi Prasetyo; Fachri Ahmad; Amrizal Saidi
JOURNAL OF TROPICAL SOILS Vol 17, No 1: Januari 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i1.9-17

Abstract

The purpose of this research was to gain a technological breakthrough in controlling Fe toxicity (Fe2+) on Ultisol in a new established rice field by using humic acid from rice straw compost and water management, so that optimal production of rice plants could be achieved. The experiment was designed using a 2 × 4 factorials with 3 replications in a split plot design. The main plot was water management consists of 2 levels: continuous and intermittent irrigation (2 weeks flooded and 2 weeks field capacity). Small plot was humic acid which was extracted from rice straw compost by NaOH 0.5 N which consists of 4 levels: 0, 200, 400, and 600 mg kg-1.  The results showed that applications of humic acid from 0 to 600 mg kg-1 that was followed by 2 weeks of intermittent irrigation decreased Fe2+ concentration. It was approaching levels that were not toxic to plants, with soil Fe2+ between 180-250 mg kg-1. The best treatment was found at the application of 600 mg kg-1 humic acid extracted from rice straw compost combined with 2 week flooded – 2 weeks field capacity of water management. Those treatment decreased Fe2+ concentration from 1,614 to 180 mg kg-1 and increased the dry weight of grain from 5.15 to 16.73 g pot-1 compared to continuous flooding and without humic acid application.

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