Judul: Rekomenasi Pemupukan Kalium pada Budi Daya Cabai Merah Besar (Capsicum annuum L) di Inceptisols Dramaga
Abstrak: The objective of this study is to find out the optimum rate of potassium fertilization in Inceptisols Dramaga. The experiment was conducted at Cikabayan University Farm from March to July 2014. This study was arranged in Randomized Complete Block Design one factor with five K fertilization rates, ie 0X (0 kg K2O ha-1), ¼ X (193.09 kg K2O ha-1), ½ X (386.19 kg K2O ha-1), ¾ X (579.29 kg K2O ha-1), and 1X (772.39 kg K2O ha-1). Potassium fertilizer was applied in three applications at 3, 6, and 9 weeks after transplanting. The results showed that K fertilization increase plant height, leaf number, weight per plant, fruit weight, fruit diameter, fruit length, marketable yield per plot, unmarketable yield per plot, marketable yield per hectare, and unmarketable yield per hectare with linear response pattern. While the addition of potassium did not affect the time of anthesis and fruit ripening. The addition of potassium fertilizer also increase total yield per plot and total yield per hectare with quadratic response pattern. In the medium K soil content with the value of 146.2 ppm (Morgan) K recommendation for red chili in inceptisols Dramaga is 487.5 kg K2O ha-1.
Keyword: Bogor Agricultural University (IPB), optimum rate, Morgan, K2O, fertilizer

Judul: Penentuan Dosis Optimum Pemupukan Kalium Pada Pertumbuhan Dan Hasil Panen Kemangi (Ocimum Bacilicum L.) Di Inceptisol Dramaga
Abstrak: Penelitian ini bertujuan untuk mengetahui dosis optimum pemupukan Kalium pada pertumbuhan dan hasil panen kemangi di Inceptisol Dramaga. Bahan tanaman percobaan yang digunakan adalah kemangi aksesi KM 4 berasal dari Garut, Jawa Barat. Percobaan dilaksanakan di kebun Agribusiness Development Station (ADS), Bogor, mulai Juni 2015 hingga Oktober 2015. Rancangan percobaan yang digunakan yaitu Rancangan Kelompok Lengkap Teracak (RKLT) 1 faktor dengan 5 taraf perlakuan dosis pemupukan K, yaitu 0 kg ha-1 K2O, 40 kg ha-1 K2O, 80 kg ha-1 K2O, 120 kg ha-1 K2O dan 160 kg ha-1 K2O. Dosis N dan P yang digunakan adalah 150 kg ha-1 N and 100 kg ha-1 P2O5. Hasil penelitian menujukkan aplikasi K berpengaruh nyata pada tinggi tanaman, bobot panen per tanaman dan tidak nyata pada jumlah cabang, jumlah cabang per tanaman saat panen, bobot basah brangkasan, bobot kering brangkasan, bobot panen per petak serta bobot panen per hektar. Aplikasi pupuk K dari 0 hingga 160 kg ha-1 memberikan respon linear terhadap tinggi tanaman dan bobot panen per tanaman. Dosis rekomendasi pemupukan Kalium di Inceptisol Dramaga belum dapat ditentukan.
Keyword: aplikasi, KM 4, K2O, pupuk

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology