Judul: Optimasi Dosis Pemupukan pada Budidaya Kubis Bunga Dataran Rendah Menggunakan Fertigasi melalui Irigasi tetes
Abstrak: Peningkatan produksi kubis bunga dataran rendah dapat dicapai melalui optimasi dosis pemupukan dengan memberikan pupuk sesuai kebutuhan tanaman. Optimasi dosis pemupukan didapatkan melalui analisis tanah dan pupuk diaplikasikan secara fertigasi melalui irigasi tetes. Penelitian bertujuan menetapkan dosis pemupukan yang optimum pada tanaman kubis bunga dataran rendah varietas Larissa F1. Penelitian dilakukan pada jenis tanah inseptisol yang memiliki pH 5,62 (masam sedang), 1,43% C-organik (rendah), 13,84 ppm P-tersedia (rendah), 172,58 ppm K-tersedia (sangat tinggi) pada bulan Juli hingga November 2022. Penelitian menggunakan rancangan kelompok lengkap teracak (RKLT) dengan 5 ulangan dan 5 taraf dosis pemupukan yaitu 0%, 50%, 100%, 150%, 200% dari dosis rekomendasi Ferads (426 kg ha-1 Urea, 374 kg ha-1 SP-36, 94 kg ha-1 KCl). Perlakuan dosis pemupukan tidak berpengaruh nyata pada setiap parameter pengamatan. Perlakuan dosis pemupukan pada tanaman kubis bunga dataran rendah menghasilkan potensi hasil 6,77 ton ha-1 atau mencapai 68,4% dari potensi hasil varietas. Dosis rekomendasi pemupukan pada tanaman kubis bunga dataran rendah varietas Larissa F1 tidak dapat ditetapkan., Increased production of lowland cauliflower can be achieved through optimization of fertilizer dose by applying fertilizer according to plant needs. Optimization of fertilizer doses is obtained through soil analysis and fertilizer is applied by fertigation through drip irrigation. The research aims to determine the optimum fertilizer dose in lowland cauliflower Larissa F1 variety. The research was conducted on inseptisol soil type which has pH 5.62 (moderate acidity), 1.43% Corganic (low), 13.84 ppm P-available (low), 172.58 ppm K-available (very high) from July to November 2022. The study used a randomized complete group design (RKLT) with 5 replications and 5 levels of fertilization doses 0%, 50%, 100%, 150%, 200% of the recommended dose of Ferads (426 kg ha-1 Urea, 374 kg ha-1 SP-36, 94 kg ha-1 KCl). The fertilizer dose treatment had no significant effect on any observed parameters. Treatment of fertilizer doses on lowland cauliflower resulted in a potential yield of 6.77 tons ha-1 or only reached 68.4% of the potential yield of the variety. The recommended dose of fertilizer for lowland cauliflower Larissa F1 variety cannot be determined.
Keyword: analisis tanah, Ferads, Larissa F1, suhu

Judul: Optimization of Fertilization Dose in Eggplant Cultivation using Fertigation through Drip Irrigation
Abstrak: Terung banyak dibudidayakan di Indonesia namun masih memiliki angka produktivitas nasional yang cukup rendah. Peningkatan produktivitas dapat dilakukan dengan menyediakan unsur hara secara tepat melalui analisis tanah dan irigasi tetes. Penelitian bertujuan mendapatkan dosis optimum rekomendasi pemupukan tanaman terung berdasarkan uji analisis tanah Mehlich 1. Penelitian dilakukan di lahan terbuka Kebun Percobaan Cikarawang, Institut Pertanian Bogor selama bulan Juni sampai November 2022. Penelitian ini menggunakan rancangan kelompok lengkap teracak (RKLT) dengan satu faktor yaitu perlakuan 5 dosis pemupukan (0% X, 50% X, 100% X, 150% X, dan 200% X di mana X merupakan rekomendasi dosis pupuk Ferads) dengan 5 ulangan. Pemberian pupuk N, P, dan K melalui irigasi tetes mampu meningkatkan tinggi tanaman, diameter batang, jumlah buah, dan bobot buah, serta mempercepat waktu antesis, waktu buah masak, dan growing heat summation. Dosis optimum pemupukan untuk tanaman terung varietas Yuvita F1 di tanah latosol tercapai pada taraf 137,74% dosis pada taraf P-tersedia sangat rendah (Mehlich 1) dan K-tersedia sedang (Mehlich 1). Dosis pupuk rekomendasi Ferads 100% dapat digunakan karena peningkatan dosis pupuk optimasi tidak meningkatkan produksi secara signifikan., Eggplant is widely cultivated in Indonesia but still has a relatively low national productivity. Productivity can be increased by providing the right nutrients amount through soil analysis and drip irrigation. The objective of this study was to find optimum fertilization recommendation dose for eggplant based on Mehlich 1 soil analysis test. The study was conducted on open field at Cikarawang, Experimental Farm, Bogor Agricultural University from June to November 2022. This study used a randomized complete block design (RCBD) with one factor that consisted of 5 doses of fertilization (0% X, 50% X, 100% X, 150% X, and 200% X where X is the recommended fertilizer dose from Ferads) with 5 replications. Application of N, P, and K fertilizers through drip irrigation can increased plant height, stem diameter, number of fruits, and fruit weight, as well as speed up anthesis time, fruit ripening time, and growing heat summation. The optimum dose of fertilizer for eggplant variety Yuvita F1 on latosol soil was reached at the level of 137.74% from recommended dose at very low available P (Mehlich 1) and medium available K (Mehlich 1). 100% Ferads fertilizer recommendation dose can be used because increased fertilizer optimum dose does not significantly produce higher yield.
Keyword: dosis optimum, growing heat summation, Mehlich 1, optimum rate

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