Judul: Aplikasi Ektornikorhiza dan Pupuk Organik untuk Memperbaiki Pertumbuhan Tanaman pada Media Tailing
Abstrak: Gold mining produces two types of waste. those are rock>- soil and tailing soil. One of serious problems of gold mining activit!- is the m.er capacit~o- f tailing dam ro store the tailing soil. In addition restoration of tailing soil is the most difficult aspect on reclamation of mining area. Chemical characteristic such as acidit!.. alkalinity. salinitl-. and high concentration of heal,>-m etals are common problem in gold mining. The uptake of the metals. such as lead. by rhe plant is seldom a problem. Associatioil of lead and cellular or sub-cellular membranes of the plant often results in the manifestation of toxic lead effects such as reductions in the activit~o,f phosphatase and enz>.me-boundA TP-ase. To minimize nega1ii.e effect of tailing. inoculation mychorrhizal fungi and addition of organic fertilizer in the tailing medium to accelerate biogeochernistq processes. \I-as applied. The aims of this research were first to study tolerance level of ectomycorhizal fungi in different concentrations of lead in in ~*irt-oco ndition. second tn stud>- the interaction between ectomycorrhizal fungi and organic fertilizer in the tailing medium to increase the plant prow~h in greenhouse condition. and rhird to stud) the effecr of organic fertilizer and charcoal amendment in tailing soil to increase the plant groll-th in field condition. The research M-as conducted in Silviculture Laborator!. of SEAMEO-BIOTROP and Gold Mining Area in Pongkor-Bopor. West fal-a during 8 months. Complete1~-r andomized design in : ( I one factor (lead concentrations) \\-as used in it7 ~qirt-oe xperiment. ( 2 )f actorial \\ hich consists of tn-o factors (mycorrhizal fungi and organic fertilizer) \\-as used in greenhouse esperiment. and (3) split plot design lvas used in field experiment where the main plot n,as tailing and sub-plot was organic fertilizer. The result of this research show-ed that lead concentration at 400 ppm inhibited railia1k~g- ronth of m~.celium of ( ' ~ J I ~ I ) L ' I ) c ' c -g~eIo~p~h ifii/>l and Rhi~opogut~I I I I C O ~ I ~ S( funpistatic effect ). but .S'c./c~lwr/~~~r.nmt~lit{ nlt~odr.ied not grot! in lead concentration at 400 ppm (f~ingitosic effect 1. I n greenhouse esperimenr. the gronrh of Eiic-rt(~prr~ycsl lirtr increased significantl!, in combinarion treatment of Rhi~opvgonI ztren/~r.a~n d tailing mixed with organic fertilizer of 1 : 1. and the best gronzh of Shor-uo ~ekrnicci ~vas obtained in inoculation of Rho~opogun IIIIL'OIIIS and tailing mixed ~vith organic fertilizer of -< : 1 . In field esperiment. the groxth Eltcrr1jprtr.v pellirir increased significantl>- b ~a,d dition nlised of organic fertilizer and charcoal. Generall!,. inoculation of tn~-corrhizal fungi and addition of organic fertilizer in railing medi~um increased the growth of seedlings.
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Judul: Aplikasi Pupuk Organik Padat dalam Memperbaiki Sifat Kimia Tailing Tambang Emas.
Abstrak: Tailing dengan kandungan logam berat yang tinggi dapat merusak sifat kimia tanah dan umumnya memiliki pH yang tidak stabil. Penelitian ini bertujuan mengaplikasikan pupuk organik padat dalam memperbaiki kualitas lahan bekas tambang emas dan mengurangi kadar logam berat Pb yang ada di limbah hasil pertambangan emas menggunakan tanaman jarak pagar (Jatropha curcas L.) sebagai parameternya. Tailing diambil dari PT Antam Emas Bogor. Terdapat 3 perlakuan nisbah campuran pupuk organik padat terhadap tailing, yaitu A (100:0), B (50:50), dan C (0:100). Parameter uji pada media tanam adalah pH dan Nitrogen Fosfor Kalium (NPK), sedangkan pengamatan pada tanaman jarak pagar meliputi pengukuran tinggi tanaman dan pertambahan jumlah daun. Nilai NPK yang memiliki nilai tertinggi ialah pada perlakuan A, diikuti oleh B, dan C. Hasil ini menunjukkan pemberian pupuk organik padat pada tanaman akan berpengaruh pada pertumbuhan tinggi dan jumlah daun pada tanaman Kata kunci: NPK, pupuk, tailing, Tailings with a high heavy metal content can damage the chemical properties of the soil and generally has an unstable pH. This research aims to apply solid organic fertilizer to improve the quality of ex-gold mining land and reduce levels of the heavy metal Pb in gold mining waste using jatropha plants (Jatropha curcas L.) as the parameter. Tailings waste is taken from PT Antam Emas Bogor. There are 3 ratio treatments of solid organic fertilizer mixture to tailings, namely A (100:0), B (50:50), and C (0:100). The test parameters on the planting media are pH and Nitrogen Phosphorus Potassium (NPK), while observations on Jatropha plants include measuring plant height and increase in the number of leaves. The NPK value that has the highest value is in treatment A, followed by B, and C. These results show that giving solid organic fertilizer to plants will affect the height growth and number of leaves on the plants. Keywords: fertilizer, lead, NPK
Keyword: NPK, Pupuk, Tailing

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf