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COMPOSITION OF PHOSPHORUS FRACTION ON PEAT ADDED WITH MINERAL SOIL AMELIORANT AND P FERTILIZATION HARTATIK, WIWIK; IDRIS, K.; SABIHAM, SUPIYANDI; DJUNIWATI, S.; ADININGSIH, J. SRI
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 21 (2003): Desember 2003
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n21.2003.%p

Most of P on peat is in the form of organic P. Composition of P on peat, especially organic P, is rarely studied. Therefore fractionation of P on peat is important to know the proportion of inorganic and organic P and available P. The aim of the experiment was to study the composition of P added with mineral soil ameliorant and P fertilization. The experiment was conducted in the laboratory of the Indonesian Center for Soil and Agroclimate Research and Development, Bogor. Two hundreds g peat dry weight (105o) added with mineral soil ameliorant in the rate of 7.5% maximum Fe sorption which is equal to 10.4 g pot-1. The mixture of peat and mineral soil (Oxisols) was then added with P fertilizer and followed by incubation for 4 weeks. After incubation, the mixture was fractioned for P. P treatment consisting of four P fertilizer sources that are Maroko rockphosphate, Christmas rock phosphate, Ciamis rock phosphate and SP-36. Four P levels are 25, 50, 75, and 100% of P sorption plus partial complete control, and replicated two times. Composition of P in this study that is readily labile, moderately labile, and non labile. P fraction determinated with sequential extraction based on the method had been used by Ivanoff. The results showed that peat from Air Sugihan Kiri, South Sumatrawas poor (oligotropyc), acidic, and low exchangeable K and ash content. Most of P on the peat was in the proportion of organic P (around 77 up to 95%) and the rest was in a small amount, inorganic P (10 up to 23%). The composition of P organic fraction showed that the non labile was relatively the same P proportion with moderately labile, meanwhile the readily labile was low. Source and rock phosphate level did not affect theproportion of organic P. The application of Maroko and Ciamis rock phosphates at the level of 100% of P sorption increased available P (readily P inorganic). Non-labile inorganic P proportion from Christmas rock phosphate was higher than those from Maroko and Ciamis.

The Effect of Soil Tillage, Intermittent Irrigation, and Fertilization on Productivity of Newly Open Rice Fields on Inceptisols and Ultisols from Muarabeliti and Tatakarya DEDI NURSYAMSI; L.R WIDYOWATI; DIAH SETYORINI; J. SRI ADININGSIH
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 18 (2000): Desember 2000
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n18.2000.%p

Field experiment was conducted to study the effects of soil tillage, intermittent drainage, and fertilization on productivity of newly open rice fields of Inceptisols in Muarabeliti, South Sumatra and Ultisols in Tatakarya, Lampung. The experiment was carried out using split plot design with 3 replications. Two varieties of rice IR-42 and Ciliwung were used as plant indicators in Muarabeliti and Tatakarya, respectively. The main plots consist of combination of soil tillage and irrigation treatments: (1) no soil tillage/flooded continuously, (2) soil tillage/flooded continuously, (3) no soil tillage/intermittent drainage, and (4) soil tillage/intermittent drainage. The treatments on sub plot were : (1) no fertilization, (2) application of organic matter (rice straw) of 5,000 kg/ha, (3) application of K fertilizer (KCI) of 150 kg/ha, and (4) application of K fertilizer (KCI) of 150 kg/ha and dolomite of 50 kg/ha. The results showed that there were no significant effets of soil tillage treatment on soil chemical characteristics, nutrients uptake, plant growth, and dry straw and grain yield. However, in Ultisols of Tatakarya, dry straw and grain yields were better with soil tillage than no soil tillage treatment. Intermittent drainage treatment decreased soil exchangeable Ca and K in Inceptisols of Muarabeliti under soil tillage condition. While in Ultisols of Tatakarya, the treatment decreased soils exchangeable Ca, K and also Mg and base saturation under with and without no soil tillage treatments. The use of 5,000 kg/ha rice straw increased soil organic-C, exchangeable K, K-HCI, and cation exchange capacity; plant K uptake; and dry straw and grain yield in both soils. Application of K fertilizer of 150 kg/ha and its combination with dolomite of 50 kg/ha, each increased soil K-HCI, exchangeable K, and dry grain yield in Inceptisols of Muarabeliti. While in Ultisols of Tatakarya each treatment increased the above parameters and dry straw yield .

Cadmium Adsorption Capacity on Inceptisols Brebes and its Uptake by Shallot as Plant Indicator LADY R. WIDOWATI; L.I NURHAYATI; . CHARLENA; S. SRI DWININGSIH; J. SRI ADININGSIH
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 21 (2003): Desember 2003
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n21.2003.%p

A research had been done in the laboratory and greenhouse of the Indonesian Center for Soil and Agroclimate Research and Developmant to study cadmium adsorption capacity, availability, and its uptake by shallot as plant indicator in order to antisipate Cd pollution in soil and plant in the future. The steps of the research were adsorption study in the laboratoryand followed by greenhouse trial. Cadmium adsorption study was using the rate of 0; 10; 30; 40; 50; 60; 70; 80; 90; and 100 ppm. The trial on response and plant uptake on cadmium used 2 kg soil pot-1 then planted with shallot var. Bima for 2 months. The experiment utilized completely randomized design with six treatments and three replicates. The rates of Cd were 0; 25; 50; 100; 200; and 400 ppm Cd (Cd(NO3)2). The results showed that Inceptisols Brebes adsorption, maximum adsorption, andbuffering capacity are 14.78 ml μg-1; 879 μg g-1 and 12,987 ml μg-1, respectively. The cadmium availability in the soil could be calculated by using the equation: Cdexchangeable = 0.0532(Cdapplied) – 1.6757, r2 = 0.9686 (after treatment); Cdexchangeable = 0.0671(Cdapplied) + 0.924, r2 = 0.9903 (after harvest). Application of 50 ppm Cd reduced shallot production up to 31% significant with total uptake of 4.57 ppm Cd. The Cd uptake increased significantly for treatment 25 ppm, Cd in shallot tuber(2.36 mg Cd per kg dry weight), and at 200 ppm Cd in leaves (7.16 mg kg-1). The cadmium content in tuber at treatment 2 ppm Cd (2.36 ppm Cd) exceeds critical value/permissible limit of vegetable for consumption.

Point of Zero Charge Determination and the Inluence of P, Basic Slag, Organic Matter and Lime Applications on Colloidal Charge and Quality of Oxisols MARKUS ANDA; ANTONIUS KASNO; WIWIK HARTATIK; . SULAEMAN; J. SRI ADININGSIH
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 19 (2001): Desember 2001
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n19.2001.%p

The colloidal charge manipulation of highly weathered soils using point of zero charge (PZC or pHo) approach is important in improving soil chemical properties. The objective of this study was to determine the PZC and manipulate colloidal charge surfaces of Oxisols in order to increase their quality. PZC was determined by adjusting pH values from 3 to 7 using potentiometric titration. The change of colloidal surface charges was measured using two extractants; NH4-acetat pH 7 and NH4Cl. A glass house experiment was carried out using 4.5 kg soil/pot. Soil was taken from Sonay, South East Sulawesi and from Sitiung, West Sumatra. Soil was taken from surface layer (0-20 cm) and subsurface layer (20-40 cm) for each location. Four factors consisted of P fertilizer, basic slag, organic matter and lime were used to manipulate colloidal surface charge. The treatment rates were 100, 200 and 400 ppm P for P fertilizer; 2, 4 and 8 t/ha for basic slag; 10, 20 and 40 t/ha for organic matter; 1.5, 3 and 6 t/ha for lime, and a complete control. All 13 treatments with three replications, were arranged using a randomized complete block design in which each layer of two Oxisols is used as a block. The results showed that values of PZC for a surface layer of Sonay Oxisol (OSY) and for surface and subsurface layers of Sitiung Oxisol (OSG) are similar, i.e, pHo was 3.5. In addition, the PZC value for the subsurface layer of OSY occurs at pH 5 which is the highest pHo value compared to three other layers. The PZC value of OSY, at a surface layer is higher than its soil pH value (5.0 vs 4.4) suggesting that colloidal surfaces bear a positive charge. In contrast, the PZC values for the surface layer of OSY and surface and subsurface layers of OSG were lower than their soil pH values, indicating the colloidal surfaces bear a negative charge. Application of P, basic slag, organic matter, and lime was able to manipulate colloidal charge surfaces having positive charges become negative and that the low negative charge of colloidal surfaces become more negative as evidenced from the increase cation exchange capacity (measured in NH4Cl) compared to a control treatment. Application of P, basic slag,organic matter, and lime could increased quality of Oxisols as shown by decreasing K leaching and by increased soybean yields, which drastically increased compared to a control treatment.

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