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Tin mined land widely spread out in Bangka Belitung provinces (Babel), the largest tin producer in Indonesia. In Bangka Island itself, most of area in the mainland is belong to Tin Mine Concession of PT. Timah and PT. Kobatin (Bappeda Bangka 2000), as a result, the impacts of mining operation have affected the environment safety such as soil quality and various aspects of community life. The open pit mining operation left the huge area become sandy tailing, piles of subsoil and excavated pond named kolong (Latifah, 2000). Provincial Government Development Planning (Bappeda) of Bangka Belitung Province (2007) reported that there are at least 991 excavated ponds with total area about 4,638 ha. Tin mining activities also caused loss of biodiversity of natural flora and fauna, cessation of soil microbiology activities and declining of land quality and productivity (Adewole and Adesina, 2011). According to Setiadi (1997), one of the causes of declining environmental quality is high heavy metal content of tailings. Unsuitable tailing will exacerbate situations that lead to severe land degradation. Abstract: Tin mined land characterized by sandy texture, high hydraulic conductivity, low nutrient holding capacity and low nutrient status. Therefore, fertilizer use efficiency maybe very low and most of nutrient applied will be lost through leaching. Some efforts to increase nutrients availability and fertilizers use efficiency should be done so that crop productivity can beeconomically increased. Research on effect of fertilizers application through fertigation system on chili cultivation was carried out on tin mined land in Bukit Kijang Village Bangka Island. The objectives of research were: (1) to examine effect of fertilization through irrigation network to thegrowth and yield of chili; and (2) to improve the efficiency use of fertilizers application for chili cultivation on tin mined land. Research is carried out in a factorial randomized block design with 4 replications, where the 1 factor is kind of ameliorant namely: manure and mixture of manure and bio-char. Meanwhile the 2 factor is the application methods and type of fertilizer namely side-band compound NPK 16-16-16 (F0), fertigation with commercial AB-mix fertilizer (F1) and fertigation with AARD’s AB-mix fertilizer (F2). Research resultsrevealed thatsandy tailinghas 84% sand fraction, low CEC and low nutrient status. Soil bulk density (BD) values ranged from 1.32 to 1.47 g cm and total pores space (TPS) varies from 44.7 48.4% v/v, wheremostly dominated by fast drainage pores (FDP) ranges from 22.3 to 30.1 % v/v. The application of manure+biochar ameliorant showed better plant growth compared to just manure ameliorant. It was alsoshowed by two parameters observed namely: plant height and stem diameter. The mixture of manure+biochar was also affected thetotal number of harvested chili fruit and total chili yield from 16 consecutive harvests. It was due tobio-char has higher pH compare to manure. Type of fertilizers and application methods have significantly affectedthegrowth and yield of chili on tin mined land. With conventional fertilization using NPK 16-16-16, total chili yield from 16 consecutive harvests is about 2,527 kg/ha. The commercial AB-mix increased fresh chili yield atabout 115% compared to conventional NPK treatment orbecome 5,436 kg/ha. Meanwhile, the AARD developed AB-mix also increased fresh chili yield about twice (100%) compared to conventional NPK orbecome 5,067 kg/ha. There is no significant different between commercial AB-mix and AARD developed AB-mix, but chili yield of commercial AB-mix little bit higher than AARD AB-mix. It revealed that the effectiveness of both AB-mix fertilizers formula is almost same.

Effect of Fertilizers Application through Fertigation System on Chili Cultivation on Tin Mined Land in Bangka Island