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All Journal JOURNAL OF WETLANDS ENVIRONMENTAL MANAGEMENT Jurnal Ilmiah Agroust
Wisnu Aji Wibowo
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Engineering Environmental Science

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Water extractable organic carbon and nitrogen and their stable isotopes from long-term experiment in a Japanese rice paddy Toan Nguyen-Sy; Weiguo Cheng; Julien Guigue; Samuel Munyaka Kimani; Wisnu Aji Wibowo; Keitaro Tawaraya; Toru Watanabe; Ji Wu; Xingkai Xu
Journal of Wetlands Environmental Management Vol 6, No 2 (2018): July-December
Publisher : Center for Journal Management and Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (861.121 KB) | DOI: 10.20527/jwem.v6i2.176

Abstract

Hot water- and water-extracted organic matter was extracted from soil samples collected after a 31-year long-term experiment which aimed to assess the effect of different fertilization strategies (inorganic fertilizers and organic matters) commonly used for paddy rice cultivation in Yamagata, northeastern Japan. The ratio of soil to extracted water was 2:3. The amounts of hot water-extracted organic carbon and nitrogen (HWEOC and HWEN) at 80 oC and 16 hours, water-extracted organic carbon and nitrogen (WEOC and WEN) at room temperature, and their δ13C and δ15N were measured from the five fertilizer treatment plots as [1) PK, 2) NPK, 3) NPK + 6 Mg ha-1 rice straw (RS), 4) NPK + 10 Mg ha-1 rice straw compost (CM1), and 5) NPK + 30 Mg ha-1 rice straw compost (CM3)], for surface (0-15 cm) and subsurface (15-25 cm) layers. HWEOC and WEOC accounted for an average of about 1.51 and 0.66% of SOC, while HWEN and WEN accounted for an average of about 1.09 and 0.40% of soil TN, respectively. About 90% of the extracted N was organic form among all treatments. The values of δ13C for HWEOC and WEOC ranged from -28.2 to -26.5‰ and from -28.3 to -27.0‰, similar to the original rice straw and rice straw compost, and lower than the value of original soil at -22.5‰. The values of δ15N of HWEN, WEN and bulk soil ranged from 0.8 to 3.8‰, from 1.0to 4.0‰, and from 0.8 to 2.8‰, respectively. It was clear that δ15N decreased in RS but increased in CM3 treatments. Our results indicated that the amounts of hot water- and water-extracted organic matter were affected by long-term application of inorganic fertilizers and organic matters remarkably. However, the values of δ13C for HWEOC and WEOC were not different among 5 treatments, but values of δ15N of HWEN and WEN were affected by RS and CM3 applications clearly.
PENGARUH DOSIS DAN KONSENTRASI PUPUK HAYATI TERHADAP PERTUMBUHAN DAN HASIL TANAMAN KACANG HIJAU (Vigna radiata L.) VARIETAS VIMA-1 Wisnu Aji Wibowo; Maria Theresia Darini; Djoko Heru Pamungkas
JURNAL ILMIAH AGROUST Vol 1 No 2 (2017): Oktober
Publisher : Universitas Sarjanawiyata Tamansiswa

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Abstract

The research aims to study the interaction, effectivness dosage and concentration of biofertilizer diversity, to growth and production of mungbean. This reasearch was conducted in Wedomartani, Special Region of Yogyakarta in Oktober to Desember  2015, altitude of 120 m above sea level, temperature 24-32o C, relative humidity (RH) 73-89%, C2 Climate and Annual rainfall + 2.000 mm. The type of soil used Regosol and Kambisol, pH 6-7. The research was arranged in RCBD (Random Complete Block Design) in two factorial with three replicaton. The first factor was Rhzobium sp.’ dosage, with two level were 7,5 gram, and 15 gram per kg seedling. The second factor was liquid biofertilizer’ concentration , with four level were 0 %, 2,5%, 5%, and 7,5 %. Growth observation variable were plant height, number of nodules, nodule weight, number of effective nodule, number of leaves, leaf area, fresh weight, dry weight, and the number of pods. Production observation variable were fresh pod weight, dry pod weight, the amount of fresh seeds per pod, pods weight per plot, 100 seeds weight, harvest index, and leaf area index. Statistical analysis conducted on all data observations using ANOVA (Analysis of Variance) at the significant level of 5% followed by DMRT (Duncan’s Multiple Range Test) at the significant level of 5%. The results showed the combination have interaction and effectivness in adding biofertilizer diversity in growth and production of mungbean. The best treatment dosage and concentration in growth and production was 7,5g/kg Rhizobium sp., and 7,5% liquid biofertilizer’ concentration
Co-Authors Djoko Heru Pamungkas Ji Wu Julien Guigue Keitaro Tawaraya Maria Theresia Darini Samuel Munyaka Kimani Toan Nguyen-Sy Toru Watanabe Weiguo Cheng Xingkai Xu