Judul: Produktivitas Kurkuminoid dan Aktivitas Antioksidan Temulawak (Curcuma xanthorrhiza Roxb.) Dibudidaya dengan Kombinasi Pupuk N, P, dan K
Abstrak: Temulawak (Curcuma xanthorrhiza Roxb.) termasuk tanaman obat yang mengandung senyawa kurkuminoid dan memiliki aktivitas antioksidan. Penelitian ini bertujuan menentukan kombinasi pupuk N, P, K terbaik berdasarkan kadar senyawa kurkuminoid dan aktivitas antioksidan pada rimpang temulawak, serta menentukan korelasi antara keduanya. Kadar kurkuminoid ditentukan dengan High Performance Liquid Chromatography (HPLC), sedangkan aktivitas antioksidan diukur menggunakan metode Ferric Reducing Antioxidant Power (FRAP) dan Cupric ion Reducing Antioxidant Capacity (CUPRAC). Kadar kurkuminoid tertinggi terdapat pada perlakuan K, P, NK, dan NPK dengan nilai masing-masing 8,61; 8,50; 7,99; dan 7,04 mg/g bobot kering. Aktivitas antioksidan tertinggi metode FRAP terdapat pada pemupukan kombinasi NK dan NPK dengan nilai 43,24 dan 41,76 µmol TE/g bobot kering, sedangkan pada metode CUPRAC terdapat pada pemupukan kombinasi NPK sebesar 307,11 µmol TE/g bobot kering. Aktivitas antioksidan berbanding lurus dengan kandungan kurkuminoid berdasarkan uji korelasi. Pupuk NPK merupakan kombinasi pupuk terbaik dalam meningkatkan kandungan kurkuminoid dan aktivitas antioksidan temulawak., Temulawak (Curcuma xanthorrhiza Roxb.) is a medicinal plant that contains curcuminoid compounds and has antioxidant activity. This study aims to determine the best combination of N, P, K fertilizers based on levels of curcuminoid compounds and antioxidant activity in temulawak rhizome, and determine correlation between them. The curcuminoid level was determined by HPLC, while the antioxidant activity was measured using the FRAP and CUPRAC methods. The highest curcuminoid levels were found in the K, P, NK, and NPK treatments with a value of 8,61; 8,50; 7,99; and 7,04 mg / g dry weight, respectively. The highest antioxidant activity of the FRAP method was found in the combination of NK and NPK fertilization with values of 43,24 and 41,76 µmol TE / g dry weight, while in the CUPRAC method was found in NPK combination fertilization with value 307,11 µmol TE / g dry weight. Antioxidant activity was directly proportional to curcuminoid content based on correlation test. NPK fertilizer is the best combination to increase the curcuminoid content and antioxidant activity of Curcuma xanthorrhiza.
Keyword: antioxidant, curcuminoid, java turmeric, NPK fertilizer

Judul: Xanthorrhizol Content and Antibacterial Activity of Temulawak (Curcuma xanthorrhiza Roxb.) Cultivated with N, P, and K Fertilizer
Abstrak: Temulawak merupakan tanaman obat yang mengandung senyawa xantorizol yang berkhasiat sebagai antibakteri. Komposisi pupuk yang sesuai meningkatkan produktivitas xantorizol temulawak. Penelitian ini bertujuan menentukan pengaruh pupuk tunggal N, P dan K serta kombinasinya terhadap produktivitas xantorizol dan aktivitas antibakteri dari rimpang temulawak. Terdapat 8 variabel yang diamati; temulawak tanpa pupuk, temulawak dengan pupuk N, P dan K tunggal, kombinasi NP, NK, PK serta NPK. Kandungan xantorizol diukur menggunakan HPLC dan aktivitas antibakteri diuji meggunakan metode difusi cakram. Analisis statistik dilakukan menggunakan uji Anova dan lanjutan dengan uji Duncan pada p < 0,05. Kadar xantorizol tertinggi terkandung pada temulawak dengan kombinasi pupuk PK sebesar 37,56 mg/g DW. Temulawak yang dibudidaya dengan pupuk NPK memiliki kemampuan antibakteri terbaik, dengan zona hambat sebesar 4,65 mm terhadap S. aureus dan 3,64 mm terhadap E. coli. Besarnya zona hambat berbanding lurus dengan kadar xantorizol ekstrak yang diujikan. Hasil penelitian ini dapat dijadikan acuan budidaya temulawak untuk menghasilkan temulawak dengan kadar xantorizol yang tinggi
Keyword: antibakteri, pupuk NPK, temulawak, xantorizol

Judul: Socioeconomic and psychological variables influencing household debt
Abstrak: The overall objective of this study was to examine factors influencing total debt, total debt payment, and patterns of debt payments. The study examined the impacts of both psychological (credit attitudes and perception of future income) and socioe- conomic variables on total debt, total debt payment and patterns of debt payments. A conceptual model for this study was developed by incorporating the theory of borrower risk, the economic and psychological economic theory of borrowing, and the results of previous studies. This model identifies socioeconomic and psycholog- ical variables that influence total debt, total debt payment, and patterns of debt payments. Socioeconomic variables included in the model are gender, race, mari- tal status, employment status, household size, age, education, and household assets. Psychological variables are credit attitudes toward the use of credit, and perception of future income. This study used data from the 1989 Survey of Consumer Finances. The survey was sponsored by the Federal Reserve in cooperation with some other federal agencies. Data for the survey were collected by the Survey Research Center at the University of Michigan between August 1989 and March 1990. dst ...
Keyword: Gender