Judul: Dinamika Nitrat Tanaman Caisin (Brassica rapa L.) pada Dataran Sedang dan Dataran Rendah yang Ditanam Terbuka dan Ternaungi
Abstrak: The objective of this study was to identify the accumulation of nitrate in caisin (Brassica rapa L.) grown in open field and screen shading at low and medium altitudes. This research was conducted on June to October 2013. Plant sampling was conducted at 3 locations at each altitudes. According to the elevation classification, low altitudes were under 500 masl (meters above sea level) and medium altitudes were between 500–700 masl. At each locations, there were 2 conditions, shaded and open field. On 2 weeks after planting, caisin grown in medium altitudes had higher nitrate levels than in the low altitudes. In addition, caisin grown under cover had higher nitrate levels than in open field.
Keyword: shade, altitude, illumination, caisin, nitrate

Judul: Phosphorus  fertilization  optimization  for  caisin (brassica rapa l. cv. Caisin)  of Andisols
Abstrak: Penelitian ini dilakukan untuk memperoleh dosis optimum pemupukan fosfor tanah Andisol. Penelitian dilakukan di Kebun Percobaan Pasir Sarongge Cianjur dari April hingga Mei 2014. Percobaan ini menggunakan rancangan Split Plot design.Bedeng utama (main plot) adalah pengkondisian hara P tanah yang terdiri atas lima taraf, yaitu X (1856.3 kg per ha P 2O5 ), 3/4 X (1392.225 kg per ha P 2O5 ), 1/2 X (928.15 kg per ha P 2O5 ), 1/4 X (464.076 kg per ha P 2O5 ) dan 0 X (0 kg per ha P 2O5). Anak Bedeng (sub plot) adalah dosis pemupukan P yang terdiri atas lima taraf, yaitu X (1856.3 kg per ha P 2O5 ), 3/4 X (1392.225 kg per ha P 2O5 ), 1/2 X (928.15 kg per ha P 2O5), 1/4 X (464.076 kg per ha P 2O5 ) dan 0 X (0 kg per ha P 2O5). Dimana X = 1856.346 kg P2O5 per ha atau 5156 kg SP-36 per ha, yaitu P yang dibutuhkan untuk mencapai kadar P sangat tinggi pada tanah Andisol Pasir Sarongge. Dosis N dan K yang digunakan adalah 200 kg per ha Urea (45% N) dan 100 kg per ha KCL (60% K 2 O). Pengkondisian hara P tanah berpengaruh sangat nyata terhadap pertumbuhan dan hasil tanaman caisin. Perlakuan pemupukan P tidak memberikan pengaruh yang nyata terhadap pertumbuhan dan hasil tanaman caisin pada tingkat kesuburan tanah sedang pengekstrak Bray. Serangan penyakit akar gada dapat menjadi penyebab pemupukan tidak berpengaruh pada tanaman. Persentase jumlah tanaman yang terserang penyakit akar gada adalah 11.90%. Dosis rekomendasi pemupukan P di Kebun Percobaan Pasir Sarongge belum dapat ditentukan, This study was conducted to find out the optimum of phosphorus fertilization on andisol. The study was conducted at the Experimental Farm Pasir Sarongge Cianjur from April to May 2014. This study arranged in split plot design. The main plot is conditioning the soil of P consisting of five rates, namely X (1856.3 kg/ha P2O5), 3/4 X (1392.225 kg/ha P2O5), 1/2 X (928.15 kg/ha P2O5), 1/4 X (464.076 kg/ha P2O5) and 0 X (0 kg/ha P2O5). Subplot is a rate of fertilizer P which consists of five levels, namely X (1856.3 kg/ha P2O5), 3/4 X (1392.225 kg/ha P2O5), 1/2 X (928.15 kg/ha P2O5), 1/4 X (464.076 kg/ha P2O5) and 0 X (0 kg/ha P2O5). Where X = 1856.346 P2O5 kg/ha or SP-36 5156 kg/ha, ie P is needed to achieve very high levels of P in the soil Andisol Pasir Sarongge. Dose of N and K were used was 200 kg ha upper of urea (45% N) and 100 kg ha upper KCl (60% K2O). The results showed that the conditioning of the soil nutrient P is able to enhance the growth and yield of caisin, whereas P fertilization treatment did not give significant effect on the growth and yield of caisin. P fertilization treatment did not give a significant effect on the growth and yield of crops on soil fertility extracting Bray. Mace root disease may be the cause of fertilization had no effect on the plant. The percentage of plants affected mace root
Keyword: pupuk, P tanah, sayuran

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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