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Articles by Triadiati
Total Records ( 2 ) for Triadiati
  Triadiati , S. Tjitrosemito , E. Guhardja , Sudarsono , I. Qayim and C. Leuschner
  Litterfall production, litter decomposition and nutrient released were influenced by land use change from natural forest into cacao agroforestry. Cacao agroforestry is a traditional form of agriculture practiced by the people of Central Sulawesi. The study was carried out in the cacao was planted under forest covers (CF1), under planted trees (CF2) and between shade trees (CP). The Natural Forest (NF) was used as the undisturbed ecosystem compared to cacao agroforestry. This research was carried out since March 2005-February 2006. We recorded litterfall production by using litter trap and decomposition of leaf litter by nylon net bag technique. Litterfall production in relation to climate was analyzed by periodic curve. The result showed that NF had the higher annual litterfall (13.67 t/ha/year) than that of cacao agroforestry. Monthly litterfall in NF and cacao agroforestry were influenced by climate. Natural forest had the highest coefficient of decomposition (k = 3.07 in March-June 2005 and 1.85 in September-December 2005) and or the fastest rate of decomposition, whereas cacao agroforestry under CF2 had the lowest one (k = 1.23 in March-June 2005 and 1.14 in September-December 2005). Carbon released was higher in the NF (1.1% in March-June 2005 and 0.5% in September-December 2005) than that of cacao agroforestry. Nitrogen released was higher in the NF than that of cacao agroforestry in the first period (1.1% in March-June 2005).
  Gergonius Fallo , Nisa Rachmania Mubarik and Triadiati
  Rice (Oryza sativa L.) is one of important and suitable corps in East Indonesia including North Central Timor (NCT) Regency. However, farmer NCT Regency have not yet use microbe as biofertilizer. The research aimed to isolate Indole Acetic Acid (IAA) producing by soil bacteria from paddy field in NCT Regency and to apply selected microbe in rice cultivation. Eight isolates were obtained and analyzed their IAA ability based on a colorimetric method using Salkowski reagent. The result showed that the producing eight isolates was able to synthesize IAA with the highest concentration produced by EP.01 isolate. The ability of these isolate to solubilize phosphate was measured by using Pikovskaya media. The EP.02 isolate has the highest ability to solubilize phosphate. The growth curve and IAA synthesis were created using EP.01 and EP.02 isolates as a model. Production of IAA was in line with the cells growth. Both EP.01 and EP.02 isolates were closely related to Bacillus sp. with 97.7 and 98.1% maximum identity, respectively. The application of Bacillus sp. solubilizer as biofertilizer on paddy field using randomized block design with the type of fertilizer as a single factor. Application of fertilizer used compost enriched with 50% NPK, had the best result on the number of filled grains per clump, dry weight of 1000 grains which were 30.76, 29.37 g and 6.3 t ha-1, respectively.
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