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All Journal Jurnal Ilmu-Ilmu Perairan dan Perikanan Indonesia Jurnal Tanah dan Iklim
S. Hardjowigeno
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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USE OF EARTHWORM TO INCREASE UPLAND ULTISOLS PRODUCTIVITY SUBOWO, .; ANAS, I.; DJAJAKIRANA, G.; ABDURACHMAN, A.; HARDJOWIGENO, S.
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 20 (2002): Desember 2002
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n20.2002.%p

Abstract

Research conducted to identify the habitat and population of earthworm in upland Ultisols, was to study the effect of ameliorant (lime and organic matter) on Ultisols as earthworm habitat in simple bamboo house experiment, to evaluate the activity of earthworm (Pheretima hupiensis) atvarious ameliorant amandment in a terrarium, the use of earthworm to increase soybean yield on Typic Palehumults. The results showed that earthworm population in Ultisols was dominated by P. hupiensis. The constraints of P. hupiensis population in wet season are low P2O5 content and high soil surface temperature at noon time. In transition from wet to dry season the constraints are high soil strength and C:N ratio soil organic matter. In dry season the constraint is low availability of water. No tillage with vertical application of organic matter and lime was the best treatment to improve the P. hupiensis activities in the argillic horizon. P. hupiensis decrease argilic horizon bulk densities, deposits casting around the rhizosfer area to improve soil nutrients absorbtion; hence, increase the upland Ultisols productivity. Population of P. hupiensis has a positive significant correlation with soybean var. Willis growth in upland Typic Palehumults with 1.19 g/ml bulk density and 12 cm-deep argillic horizon.
KAJIAN DAYA DUKUNG LINGKUNGAN KAWASAN PERTAMBAKAN DI PANTURA KABUPATEN GRESIK JAWA TIMUR V. D. Prasita; Bambang Widigdo; S. Hardjowigeno; S. Budiharsono
Jurnal Ilmu-Ilmu Perairan dan Perikanan Indonesia Vol. 15 No. 2 (2008): Desember 2008
Publisher : Institut Pertanian Bogor

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ABSTRAKPenelitian ini dilakukan untuk mengkaji daya dukung lingkungan kawasan pertambakan di Gresik Jawa Timur. Metode yang digunakan adalah metode survei dan pengumpulan data sekunder dari berbagai hasil penelitian lain maupun hasil laporan instansi terkait. Penelitian ini menggunakan tiga pendekatan analisis daya dukung lingkungan, yaitu: analisis regresi, metode kuantitatif ketersediaan air di perairan, dan metode pembobotan yang diambil dari kelas kesesuaian lahan. Hasil kajian memperlihatkan bahwa pemanfaatan lahan pesisir untuk pertambakan di daerah studi sudah melampaui daya dukung lingkungannya. Fenomena ini terlihat dari produksi tambak maksimum 12 134.4 ton pada saat luas lahannya 10 943.5 ha pada tahun 1999. Dengan pendekatan pertama, analisis regresi, luas lahan yang dapat didukung untuk budidaya tambak tradisional sebesar 9 378.89 ha. Pendekatan kedua dengan metode kuantitatif menghasilkan luas lahan yang dapat didukung untuk budidaya tradisional, semi-intensif dan intensif berturut-turut 9 413.49 ha, 1 647.36 ha dan 941.35 ha. Pendekatan terakhir menghasilkan luas area yang dapat didukung untuk kegiatan budidaya bandeng (Chanos chanos) sebesar 9 882.89 ha dan budidaya udang secara tradisional sebesar 9 457.28 ha. Hasil penilaian daya dukung lingkungan pertambakan dengan tiga pendekatan tersebut saling mendukung dan melengkapi dalam proses penentuan batas pengembangan maupun pengelolaan kawasan pertambakan di daerah studi secara berkelanjutan.Kata kunci: kawasan pertambakan, kesesuaian lahan, daya dukung lingkungan.ABSTRACTThis research was carried out to analyze the environmental carrying capacity of brackishwater fishponds. The research had been conducted in Gresik, East Java by using the survey method and collecting secondary data from the other researches and related institutions. In this research, three approaches used for analyzing the environmental carrying capacity of the brackishwater fishponds zone, ie.: regression analysis, quantitative method for water availability and weighted methods for land suitability grade. The result showed that utilization of coastal land for the brackishwater fishponds surpassed to its environmental carrying capacity. This phenomenon had once showed in 1999 that maximum production of brackishwater ponds of 12 134.4 tons occupied 10 943.5 ha land areas. By using regression analysis, land area suggested for aquaculture is 9 378.89 ha. By using water quantity method, the land areas suggested for traditional, semi-intensive and intensive cultures are 9 413.49 ha, 1 647.36 ha and 941.35 ha, respectively. The third approach suggested that the land which can be used for milkfish (Chanos chanos) culture is 9 882.89 ha and for shrimp culture is 9 457.28 ha. Those results are useful to assess sustainable development and management of brakishwater pond zone in the North Coast of Gresik Regency.Key words: brackishwater pond area, land suitability, environmental carrying capacity.
The Role of Iron Oxide in The Characteristics of the Highly Weathered Soil ACHMAD HIDAYAT; S. HARDJOWIGENO; M. SOEKARDI; SUPIYANDI SABIHAM
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 20 (2002): Desember 2002
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n20.2002.%p

Abstract

Iron oxide is generaly found in the clay mineral composition of highly weathered soil (low activity clay soil) like Oxisols. There is limited information about the role of iron oxide in Oxisols, on the other hand the information is very important when we want to make use of the Oxisols. This study was done to investigate the role of iron oxide in the soilcharacteristic especially CEC, pHo, available water, plasticity index, soil color and maximum phosphate absorption. Soil samples were taken based on Soil Survey Staffs (1991), from different kinds of highly weathered soil i e: Typic Hapludox, Plinthic Hapludox and Anionic Acrudox, each sample was taken from two locations. At each location sample was taken from three different site : upper, middle and lower slope. Chemical analysis was done to determin the level of Fe.d, Fe.o, Fe.p, CEC (NH4OAc 1 M), pHo, available water, atterberg index and maximum phosphate absorption, and soil characteristics that useful for soil classification. Data were analyzed using matrix correlation test, simple and multiple regression. Principle Component Analysis was used to solve when multicolinearity problem happen. Results show that the Anionic Acrudox has the highest content of Fe.d and Fe.o, varied from 12.03 – 12.27% and1.01 – 1.12% . Followed by Typic Hapludox varied from 9.52 – 10.57% and 0.31 – 0.46% respectively for Fe.d and Fe.o. The level of Fe.d and Fe.o for Plinthic Hapludox varied from 6.31 – 9.40% and 0.09 – 0.17%. The higher the iron oxide content the lower the cation exchange capasity and the higher of the pHo. Multi regression analysis results between CEC and some soil characteristics shows that Fe.d and Fe.o can indicate thehighest variability namely 35.8%. While correlation between pHo and Fe.o shows the highest correlation and highly significant (r² = 0.65).Iron oxide has highly effect on available water and plasticity index, the higher the iron oxide content, the higher is the available water and the lower the plastisity index. The higher the iron oxide content the higher is intensity of red color of the soil. And the higher the iron oxide content, the higher is the maximum phosphate absorption; this condition is disadvantageus for plants, because the phosphate is not available for plants.
Co-Authors . SUBOWO A. ABDURACHMAN Achmad Hidayat G. Djajakirana I. Anas M. SOEKARDI S. Budiharsono SUPIYANDI SABIHAM V. D. Prasita