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All Journal Journal of Sustainable Development Science Unesa Journal of Chemistry
Dewa Ayu Ari Febriyanti
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Energy Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology

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Percentage Attacks of Plutella xylostella and Parasitization of the Parasitoid Diadegma semiclausum on Cabbage in Kintamani District Dicky Marsadi; Dewa Ayu Ari Febriyanti
Journal of Sustainable Development Science Vol 6 No 1 (2024)
Publisher : Universitas Dwijendra Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46650/jsds.6.1.1551.30-35

Abstract

Cabbage plants are one of the horticultural commodities that many farmers cultivate in Indonesia because they have economic value, because apart from being able to meet domestic needs, cabbage also has the opportunity to become an export commodity. This study aims to determine the percentage of attacks by the cabbage leaf caterpillar Plutella xylostella and the level of parasitization of the parasitoid Diadegma semiclausum in Kintamani District. This research was carried out in Sekaan Village and Kedisan Village. The research method uses a survey method. Sampling of cabbage plants in the field was carried out diagonally so that 5 sample points were obtained, 10 plants were observed at each sample point. The research results showed that the percentage of P. xylostella pest attacks in Sekaan Village and Kedisan Village ranged from 12% to 28%. The average population of P. xylostella larvae in Sekaan Village ranges from 0.98 individuals/plant to 1.82 individuals/plant and the highest average population of P. xylostella larvae in Kedisan Village ranges from 0.7 individuals/plant to 1.66 individuals/plant. The level of parasitization of the parasitoid D. semiclausum in Sekaan Village ranges from 32% to 56% and the level of parasitization of the parasitoid D. semiclausum in Kedisan Village ranges from 24% to 48%. The highest peak of parasitization was found in the fourth observation (4 WAP).
KAJIAN KARAKTERISTIK FISIK PUPUK GRANUL UREA-BIOCHAR BAMBU BERSELAPUT ASAM AKRILAT Ni Nyoman Ari Putri Murtiyah; Ni Ketut Karina Sari; Dewa Ayu Ari Febriyanti; I Wayan Dirgayana
Unesa Journal of Chemistry Vol. 15 No. 1 (2026): Vol 15 No 1
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v15n1.p7-13

Abstract

Nitrogen use efficiency in conventional urea fertilizers remains low due to nutrient loss through leaching and volatilization. This study aims to develop and characterize a slow-release fertilizer (SRF) based on a bamboo biochar matrix coated with acrylic acid polymer. The fertilizers were formulated into granules using coating and matrix methods with urea proportions of 25%, 30%, and 35%. Characterization included physical properties, surface morphology, and elemental composition using Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDS). The results showed that the produced granules were dominated by sizes of 2–5 mm, ranging from 80.17% to 92.50%, complying with the Ministry of Agriculture Regulation (Permentan) No. 01 of 2019. SEM analysis confirmed that acrylic acid successfully encapsulated the pores of the bamboo biochar and urea, forming a physical barrier structure that extends the nutrient diffusion path. EDS spectra verified the successful impregnation of urea into the matrix, with Nitrogen (N) retention of 41.15% for the coating method and 27.97% for the matrix method. The presence of bamboo biochar micropores and the polymer layer aligns with slow-release principles, enhancing agronomic efficiency while minimizing environmental impacts.
Co-Authors Dicky Marsadi Ni Ketut Karina Sari Ni Nyoman Ari Putri Murtiyah