Judul: The Effect of P Fertilization and Liming to Growth and Corn Production with Transplanting System on Saturated Soil in Tidal Swap Land
Abstrak: Kebutuhan jagung Indonesia terus meningkat seiring meningkatnya jumlah penduduk Indonesia. Produktivitas jagung Indonesia hingga saat ini masih tergolong rendah. Pemenuhan kebutuhan jagung Indonesia masih terpenuhi lewat impor sebesar 3,19 juta ton pada tahun 2013. Peningkatan produksi jagung dapat dilakukan melalui pemanfaatan lahan marginal dengan pemberian pupuk fosfor dan kapur yang dipadukan dengan teknologi budidaya jenuh air. Penelitian ini bertujuan menguji pengaruh pemupukan fosfor dan pengapuran terhadap pertumbuhan dan produksi jagung dengan sistem transplanting pada budidaya jenuh air di lahan pasang surut. Percobaan dilaksanakan di Desa Karyabakti, Kecamatan Rantau Rasau, Kabupaten Tanjung Jabung Timur, Provinsi Jambi. Rancangan yang digunakan adalah Rancangan Kelompok Lengkap Teracak (RKLT) faktorial dua faktor, yaitu dosis fosfor (0, 46, 92, dan 138 kg ha-1), dan dosis kapur (0 dan 2 ton ha-1) dengan tiga ulangan. Hasil penelitian menunjukkan bahwa pemupukan fosfor dosis 138 kg ha-1 yang dikombinasikan dengan pemberian kapur dosis 2 ton ha-1 secara nyata memberikan hasil terbaik dengan produktivitas pipilan jagung mencapai 7,30 ton ha-1, Indonesia’s corn needs continue to increase along with increasing population of Indonesia. Indonesia’s corn productivity is still relatively low. In 2013, Indonesia’s corn needs are still fulfilled through imports of 3,19 million tons. Increasing corn production can be done through the use of marginal land by applying phosphorus fertilizer and lime, combined with water saturated cultivation technology. This study was aimed to examine the effect of p fertilization and liming to growth and corn production with transplanting system on saturated soil in tidal swap land. This research was accomplished in Karyabakti Village, Rantau Rasau District, East Tanjung Jabung Regency, Jambi Province. It was arranged in Randomized Complete Block Design (RCBD) of two factors, namely phosphorus doses (0, 46, 92,and 138 kg ha-1), and lime doses (0 and 2 ton ha-1) with three replications. The result shows that phosphorus fertilization at doses of 138 kg ha-1 combined with lime at doses of 2 ton ha-1 actually gives the best results with the productivity of shelled corn reaching 7,30 ton ha-1
Keyword: BJA, phosphorus, lime, productivity, transplanting

Judul: The Effect of Phospate Fertilization on Growth and Production Two Variety of Corn with Saturated Soil Culture in Rice Fields
Abstrak: Salah satu upaya untuk meningkatkan produksi jagung yaitu dengan memanfaatkan lahan basah untuk budidaya jagung, karena selama ini mayoritas jagung dibudidayakan pada lahan kering. Teknik budidaya jenuh air merupakan teknik dalam budidaya pada lahan basah untuk meningkatkan produksi dan produktivitas kedelai. Budidaya jenuh air menggunakan olah tanah minimum dengan dosis pemupukan yang tepat dapat menurunkan biaya dalam usaha budidaya. Penelitian ini bertujuan untuk mengetahui pemilihan varietas dan dosis pemupukan P yang tepat terhadap produksi jagung yang dibudidayakan dengan teknik budidaya jenuh air di lahan sawah. Penelitian dilakukan pada bulan Agustus hingga Desember 2020 di Kebun Percobaan Sawah Baru Institut Pertanian Bogor. Penelitian ini menggunakan rancangan kelompok lengkap teracak (RKLT) dua faktor yaitu varietas (Sukmaraga dan Pioneer-27) dan dosis pupuk P (0 kg P2O5 ha-1, 18 kg P2O5 ha-1, 36 kg P2O5 ha-1, 108 kg P2O5 ha-1) yang terdiri dari 8 satuan percobaan yang diulang sebanyak 3 kali. Berdasarkan penelitian yang telah dilakukan, varietas Pioneer-27 merupakan varietas yang direkomendasikan karena varietas Pioneer-27 mampu menghasilkan produktivitas yang lebih tinggi. Dosis pemupukan 108 kg P2O5 ha-1 merupakan dosis yang direkomendasikan dalam budidaya jagung dengan teknik budidaya jenuh air di lahan sawah, karena memberi pengaruh yang nyata terhadap produkstivitas jagung pipil kering., One of the attemps to increase corn producion is using wet land for corn cultivation, because so far the majority of corn cultivated in the dry land. The saturated soil culture is a technique for cultivation in the wet land in order to increase production and productivity of corn. Saturated soil culture which is using minimum tillage with correctly dose of fertilizer can decrease cost of cultivation. This research purpose is to find out the good variety and the optimum dose of phospate fertilizer for corn production which is cultivated with under saturated soil culture in the paddy fields. The research has been done in August until December 2020 at Sawah Baru Experimental Station, IPB University. This research consisted two factors and using randomized complete block design (RCBD). The factors were variety (Sukmaraga and Pioneer-27) and phospate fertilizer dose (0 kg P2O5 ha-1, 18 kg P2O5 ha-1, 36 kg P2O5 ha-1, 108 kg P2O5 ha-1). The reseacrch consisted of 8 experimental units which repeated 3 times. Based on research which has been done, Pioneer-27 variety is a recommended variety because performed the higher production of corn. The dose of feretilization 108 kg P2O5 ha-1 is a recommended dose in corn cultivation with saturated soil culture in paddy fields, because show obvious effect to corn productivity.
Keyword: aturated soil culture, rice fields, phospate fertilization, productivity, corn

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