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

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Dominant Soil Characteristics that Effect on Available K at Smectitic Soils DEDI NURSYAMSI; K. IDRIS; SUPIYANDI SABIHAM; AGUS SOFYAN
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

Research aimed to study dominant soil characteristics that effect on available K of smectitic soils were conducted in Laboratory of Research and Soil Test, Indonesian Soil Research Institute. The soil characteristics that has been analised were soil texture (pipette), organic-C (Kjeldahl), and CEC (NH4OAc); mineralogical analyses of clay fraction (X-Ray Diffraction); K fractionation: soil soluble-K (0.0002 M CaCl2), exchangeable-K (NH4OAc), and total-K (HNO3+HClO4); and potassium sorption. The results showed that the content of soil soluble, exchangeable, non-exchangeable, and total-K was in order of Vertisols > Alfisols > Inceptisols. The percentage of soil K fraction of the soils, however, was in order of soluble-K < exchangeable-K < non-exchangeable-K. Although the soils had high content in total K but most of them were in nonexchangeable form, thus they were not available for plant growth. Soil K buffering capacity and maximum sorption were in order of Vertisols > Alfisols > Inceptisols. The bond energy constant of Vertisols, however, was similar with that of Alfisols but it was about twice with that of Inceptisols. Soil clay, organic-C, and CEC affected the availability of soil K significantly (P > 0.95). Smectite contributed significantly (P > 0.95) to soil negative charge so that it held an important role in controlling soil K buffering capacity and maximum sorption. To increase the efficiency of K fertilizer, plant species that can produce organic acid exudated from roots in high quantity can be developed in smectitic soils. The use of Na, NH4, and Fe cations need also to be considered for K management in the soils as well.
Keselarasan Penyediaan Nitrogen dari Pupuk Hijau dan Urea dengan Pertumbuhan Jagung pada Inceptisol Darmaga , Wawan; S. Sabiham; K. Idris; G. Djajakirana; S. Anwar
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 35 No. 3 (2007): Buletin Agronomi
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
HASIL DAN MUTU BENIH KEDELAI (Glysine max (L.) Merr.) DENGAN BUDIDAYA BASAH I. G. N. Raka; W. Q. Mugnisjah; J. Wiroatmodjo; K. Idris
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 23 No. 1 (1995): Buletin Agronomi
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 (811.73 KB) | DOI: 10.24831/jai.v23i1.1622

Abstract

Field experiment for soybean seed production was carried out in Darmaga Experimental Station from June to September 1992. Three varieties of soybean, namely Lokon, Wilis, and Amerikana (early, middle, and late maturity, respectively) were planted both by saturated and conventional soil culture. Seed quality testing was carried out in the Laboratory of Seed science and Technology at IPB, Bogor, from September to October 1992. Yield components and seed production of the three varieties showed the same pattern in both saturated and conventional soil culture. Seed quality of Lokon and Wilis varietieswere higher than that of Amerikana in both cultivations. This was due to the less field weathering experienced by Lokon and Wilis varieties. Compared to the conventional soil culture, the saturated soil culture improved the yield components, seed production, and performance of seed physical and physiological quality of the three varieties.
Co-Authors , Wawan Agus Sofyan Dedi Nursyamsi G. Djajakirana I. G. N. Raka J. Wiroatmodjo S. Anwar S. Sabiham SUPIYANDI SABIHAM W. Q. Mugnisjah