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All Journal Jurnal Ilmu Pertanian Indonesia Social, Humanities, and Educational Studies (SHEs): Conference Series Jurnal Tanah dan Iklim
Wiwik Hartatik
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Agriculture, Biological Sciences & Forestry Education Languange, Linguistic, Communication & Media Social Sciences

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Pengembangan Pupuk Cair Nitrogen Berukuran Nanometer untuk Meningkatkan Efisiensi Pemupukan Deden Saprudin; Munif Gulamahdi; Wiwik Hartatik; Latifah Kosim Darusman; Ilfa Nuraisyah
Jurnal Ilmu Pertanian Indonesia Vol. 17 No. 2 (2012): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (167.569 KB)

Abstract

Conventional utilization of urea just has absorbed 30-60%. Remaining, 40-70% lost to environment, give not economic benefit and serious problem in environment. The use of less efficient urea has received attention lately. One way to overcome the problem of inefficiency of urea fertilizer use is a nano-sized fertilizer. Synthesized nanofertilizer in this study were nanomagnetit (Fe3O4). Nanomagnetit synthesized from FeCl3 as a source of iron, sodium citrate as the reductant, and urea as a source base. Nanomagnetite synthesized using a hydrothermal method. Based on the results of X-ray diffraction, the nanomagnetit has average crystal size 46.66 nm and crystal structure is Face Center Cubic. Energy-dispersive X-ray spectroscopy shows constituent elements in nanomagnetite are iron (29.45%), oxygen (53.07%), carbon (14.86%), and sodium (2.62%). This shows the iron and oxygen is the main constituent elements nanomagnetite. In the process of magnetite formation absorbed urea by 30% with N content (0.14%) and most are in the liquid synthesis (0.82%) so that it can be used as fertilizer on crops. Based on this research, variations of pH (6-8) liquid fertilizer provided no significant effect. The addition of 0.15 g nanomagnetite have better growth among other treatments.
Aplikasi Biochar dan Tithoganic dalam Peningkatan Produktivitas Kedelai (Glycine max L.) pada Typic Kanhapludults di Lampung Timur Wiwik Hartatik; Heri Wibowo; Jati Purwani
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) Vol 39, No 1 (2015)
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v39n1.2015.51-62

Abstract

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

Abstract

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.
Solubility of Rock Phosphate and SP-36 in Peat Soils Amended with Mineral Soil WIWIK HARTATIK; K IDRIS
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 27 (2008): Juli 2008
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n27.2008.%p

Abstract

Rock phosphates application on peat soil has a good prospect because of its high solubility in acid condition. However, the study of the solubility of rock phosphate in peat soils is still limited. This study aimed to quantify the solubility of rock phosphate and the effects of some sources of rock phosphates and SP-36 in the peat soils, taken from South Sumatera amended with mineral soil. The study was conducted in the laboratory ofIndonesian Soil Research Institute, in Bogor. The study consisted of two activities: 1) study on the solubility of some rock phosphates (Marocco, Christmas, and Ciamis) in peat soils. For this study a 100 g of oven dried (105oC) peat soil for each treatment was used for this study. The treatments were eleven levels of P i.e. 0, 10, 20, 30, 40, 50, 60, 75, 100, 125, and 150 ppm P applied to dried peat soils. The treated peat soils werethen incubated for 2 weeks before analyses of soluble P was conducted. The molybdat blue method was used to analyze the samples at 2, 4, 8, and 12 weeks after the incubation. 2) The second study i.e. the application of some rock phosphates or SP-36 on the peat soils amended with mineral soils, four levels of P (25, 50, 74, and 100% of P sorption) plus partial and complete control treatments have been replicated twice. Two hundred grams of oven dried peat soils (105oC) amended with mineral soils at 7,5% maximum Fe sorption, incubated for four weeks, and then soluble P was analyzed using molybdat blue at 1, 2, 4, 6, 8, 10, and 12 weeks after incubation. The results showed that the order of rock phosphates solubility in peat soils was Marocco> Ciamis>Christmas. The solubility of P in peat soils amended with mineral soil and rock phosphates gave similarresults as rock phosphate was in the order of SP-36>Marocco>Ciamis> Christmas. Soluble P increased up to 8 weeks of incubation, and then decreased. The effect of soil mineral ameliorant and some rock phosphates application of soluble P at 12 weeks after the incubation around 15.7-34.2 ppm P. Rock phosphates that has high reactivity gave a high Psolubility on peat soils so it that can be used as P sources in the peat soil.
Improving Social Studies Learning Outcomes by Using Learning Video Media For Fourth Grade Students Of SDTQ Al Abidin Surakarta For The 2018/2019 Academic Year Wiwik Hartatik
Social, Humanities, and Educational Studies (SHEs): Conference Series Vol 3, No 4 (2020): Social, Humanities, and Educational Studies (SHEs): Conference Series
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (180.912 KB) | DOI: 10.20961/shes.v3i4.53370

Abstract

The research was motivated by the problem of the low social studies learning outcomes of fourth grade students. This is because teachers often use the lecture method, students only listen and record all information from the teacher. This study aims to explain whether the use of instructional video media in social studies subjects for class IV SDTQ Al Abidin Surakarta is able to improve student learning outcomes. This PTK consists of 2 cycles. Data collection techniques from learning outcomes tests at the end of each cycle meeting. The results showed an increase in student learning outcomes for social studies lessons. In the initial conditions, student learning outcomes complete KKM 15%. In the first cycle, the students who completed the KKM were 50%. The number of students who completed the KKM in the second cycle increased to 85%. There was an increase in the number of students who completed the KKM each cycle. With the evidence in this study, learning with video media is recommended to be applied in learning activities, in an effort to provide quality learning and can improve student learning outcomes.
Co-Authors . Sulaeman ANTONIUS KASNO Deden Saprudin Heri Wibowo Ilfa Nuraisyah J. SRI ADININGSIH Jati Purwani K Idris Latifah Kosim Darusman MARKUS ANDA