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Nitrogen Dynamic from Applied Rice Straw Compost in Flooded Soil Linca Anggria; T. Rustaman; A. Kasno
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) Vol 38, No 2 (2014)
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v38n2.2014.89-94

Abstract

Abstract. Nitrogen is the main fertilizer to increase rice production. Nitrogen fertilizer use efficiency is affected by organic matter content in the soil. Understanding decomposition and nitrogen release of plant materials is important to better manage organic inputs. The objective of this research was to study the nitrogen dynamics on flooded soil with rice straw compost application. The experiment was carried out in green house of Indonesian Soil Research Institute (ISRI) on October 2010 to January 2011. Soil samples were taken from Ciruas, Banten. The analysis of ammonium and nitrate were conducted 14, 20, 30, 40, 50, and 60 days after planting. The result showed that ammonium and nitrate in soil with straw compost applications were lower than that of chemical fertilizer application. After day 20, the concentration of ammonium in soil decreased to the same level for all treatments. The concentration of nitrate, after increase on day 40 decreased until the last obeservation (day 60). Nitrogen concentration in straw was higher under chemical fertilizer than that of straw compost application. In rice grain, N concentrations were not significantly different among the two treatments. Abstrak. Nitrogen adalah pupuk utama untuk meningkatkan produksi beras. Efisiensi penggunaan pupuk nitrogen dipengaruhi oleh kandungan bahan organik dalam tanah. Pemahaman mengenai dekomposisi material tanaman adalah sesuatu yang penting untuk lebih baik dalam mengelola penambahan bahan organik. Tujuan dari penelitian ini adalah mempelajari dinamika hara nitrogen pada tanah sawah dengan penambahan bahan organik (kompos jerami). Penelitian dilakukan di rumah kaca, Balai Penelitian Tanah pada bulan oktober 2010 sampai Januari 2011. Sampel tanah berasal dari Ciruas, Banten. Analisis amonium dan nitrat dilakukan pada hari ke-14, 20, 30, 40, 50, dan 60 setelah tanam. Hasil penelitian menunjukkan bahwa amonium dan nitrat dalam tanah dengan penambahan kompos jerami lebih rendah dibandingkan dengan pupuk kimia. Umumnya setelah hari ke-20, konsentrasi amonium di dalam tanah menurun untuk semua tingkat perlakuan. Sedangkan konsentrasi nitrat, setelah meningkat pada hari ke-40 konsentrasi menurun hingga hari terakhir (hari ke-60). Konsentrasi nitrogen pada jerami menunjukkan bahwa aplikasi pupuk kimia lebih tinggi dibanding kompos jerami. Sedangkan konsentrasi N pada gabah padi tidak berbeda nyata.
PELEPASAN SULFUR PADA TANAH SAWAH Linca Anggria; Antonius Kasno; Tia Rostaman
Agric Vol. 31 No. 1 (2019)
Publisher : Fakultas Pertanian dan Bisnis, Universitas Kristen Satya Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/agric.2019.v31.i1.p67-74

Abstract

The objective of this study was to determine the release of S in paddy soil. The experiment was carried out in the greenhouse which the soil sample was taken from three different sites. The treatment consists of (T0) control, (T1) 0.02 g S pot-1, (T2) 0.04 g S pot-1, (T3) 0.08 g S pot-1, (T4) 0.04 g S pot-1 + rice straw. The concentration of S was measured in soil, surface water (soil solution) and leached water. The results showed that the addition of S increased the available S. In general, concentration of S in soil was high for site 1 and 3. It was possible due to the higher clay content for site 1 and 3 compared to site 2. The higher S concentration in soil solution was obtained by treatment T3 for all sites. Sulfur concentration in leached water was higher for T2 compared to T4. It indicated that rice straw could protect the release of S in leached water.
FAKTOR PENGENDALI KELARUTAN SILIKA DALAM LARUTAN TANAH Linca Anggria; Husnain Husnain; Tsugiyuki Masunaga
Agric Vol. 32 No. 2 (2020)
Publisher : Fakultas Pertanian dan Bisnis, Universitas Kristen Satya Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/agric.2020.v32.i2.p83-94

Abstract

Silica is a beneficial element for rice plants which can protect from blast disease, increase stem strength, and alleviate abiotic stress. Silicon in soil solution is affected by several factors such as pH, temperature, organic matter, and redox potential (Eh). This study aims to investigate the controlling factor of Si solubility in soil solution. In the present study, Japanese silica gel (JSG) and Ultisols were collected from Japan. In laboratory experiment, the effects of Ca (calcium), Mg (magnesium) and others on solubility of Si (silica) were investigated. Under submerged condition, ten gram of soil with silica gel, Ca and Mg in plastic tube were incubated at 300C for 29 days. Calcium and Mg were applied into soil, at the concentration of 5, 10, 15 mg Ca L-1(T2, T3, T4 respectively) and 5, 10, 15 mg Mg L-1(T5, T6, T7 respectively). There was two controls as a follow T0 (soil) and T1 (soil + silica gel). During incubation, Si, Ca, Mg, Fe, and Mn concentrations in surface water were measured using ICP spectroscopy at day 8, 15, and 29. The results show the soil before treatment was slightly acidic (pH 5.7) and extractable Si concentration was 267.1 mg SiO2 kg-1. It was classified to be below critical level of available Si for rice (300 mg SiO2 kg-1). Total concentration of Ca and Mg in soil solution were highest for treatment T4 and T7, respectively compared with other treatments. On the first 8 days of incubation, Si released into soil solution was higher in T1 and T2 compared to other treatments. The solubility of Si was significantly positive correlated with Mn, Eh, and negatively correlated with pH, that indicated these were the controlling factors of the Si release in soil solution. There was no correlation between Si and Ca or Mg concentration in soil solution.
Co-Authors A. Kasno ANTONIUS KASNO Husnain Husnain T. Rustaman Tia Rostaman Tsugiyuki Masunaga