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All Journal Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Jurnal Tanah dan Iklim
G. Djajakirana
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Agriculture, Biological Sciences & Forestry Economics, Econometrics & Finance

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CHANGES OF SOIL ORGANIC MATTER FRACTION ON ULTISOLS JASINGA BY SOIL TILLAGE AND ORGANIC MATTER PRACTICES NURIDA, NENENG LAILA; HARIDJAJA, O.; ARSYAD, S.; SUDARSONO, .; KURNIA, UNDANG; DJAJAKIRANA, G.
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 26 (2007): Desember 2007
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n26.2007.%p

Abstract

In situ organic matters, such as Mucuna sp., Flemingia sp., and plant residues differ in quality (in terms of lignin, cellulose and nutrients contents). Such difference determines soil organic matter content especially labile fraction that could effect on soil properties. The aims of this research were to study: 1) the effects of various sources and quality of organic matters on soil organic fraction, and 2) the relationships between the changes of particulate organic matter and C-microbes (POM and Cmic) and soil quality indicators. The experiments were conducted in greenhouse of the Center for Soil and Agroclimate Research and Development, Bogor, from January to May 2003. The factorial completely randomized design was used with three replications. The first factor was the method of organic matters application: 1) mulch on soil surface and 2) incorporated with soils. The second factor was the sources of organic matters (dosage in equvalent with 2% organic C), i.e: 1) Mucuna sp., 2) Flemingia sp., 3)maize residue, 4) mixture of Mucuna sp., and Flemingia sp., 5) mixture of Flemingia sp. and maize residue, 6) mixture of Mucuna sp. and maize residue, and 7) mixture of Mucuna sp., Flemingia sp., and maize residue. The results showed that on organic matter application with incorporated method, C/N ratio and lignin content of organic matter have positive correlation with organic C, Cmic and Cmic/Corg, but have negative correlation with POMp. The changes of soil qualities caused by short term organic matter application could be seen from the changes of labile fraction of organic matter. When organic matter was incorporated, POMtand POMt/Corg have positive correlation with bulk density, but have negative correlation with RPT, PDC, available K, and total- N. When organic matter was spreaded on the soil surface, Cmic has positive correlation with available P. The changes on labile fraction (Cmic and POMt) was easy to be detected in short period, thus the changes of physical characteristics and the availability of macro nutrients is easy to be predicted.
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.
Keselarasan Penyediaan Nitrogen dari Pupuk Hijau dan Urea dengan Pertumbuhan Jagung pada Inceptisol Darmaga , Wawan; S. Sabiham; K. Idris; G. Djajakirana; S. Anwar
Indonesian Journal of Agronomy Vol. 35 No. 3 (2007): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (128.549 KB) | DOI: 10.24831/jai.v35i3.1326

Abstract

Increasing N use efficiency and decreasing N pollution can be achieved by synchronization between supplying pattern of N and crop N demand. Leaching-incubation experiment had been carried out for evaluating supplying pattern of N from 14 treatments of green manure (Flemingia and Gliricidia), urea and their combinations. Only 5 treatments of the split application of Gliricidia, urea and their combinations, and single application of combination of  urea and Gliricidia synchronize with corn N uptake model. These five fertilization treatments were further examined in the greenhouse and in the field experiment. The synchronization between supplying pattern of N and corn growth in treatment without leaching was resulted by application of urea at planting followed by Gliricidia at 3 weeks after planting (WAP) and urea at planting and 3 WAP, whereas in treatment with leaching were resulted by split application of Gliricidia at planting and 3 WAP, urea at planting followed by Gliricidia at 3 WAP, and single application of urea and Gliricidia at planting. Urea applied at planting followed by Gliricidia at 3 WAP resulted in the high production of seed dry-weigh  with low N inorganic leaching.   Key words: Synchronization, nitrogen, green manure, urea, corn
Co-Authors , Wawan . SUBOWO A. ABDURACHMAN I. Anas K. Idris Laksono Trisnantoro NENENG LAILA NURIDA O. Haridjaja S. Anwar S. Arsyad S. Hardjowigeno S. Sabiham UNDANG KURNIA