Judul: Hydroponic fodder for as an feeding alternatives to meet shortage of forage for dairy cattle during dry season
Abstrak: Hydroponic fodder merupakan salah satu teknologi yang bisa digunakan untuk penyediaan hijauan pakan melalui penanaman hijauan pakan dengan sistem hidroponik. Tujuan penelitian ini adalah untuk melihat pengaruh perlakuan terhadap produktivitas dan kualitas nutrisi jagung hidroponik untuk sapi perah. Penelitian ini menggunakan rancangan acak lengkap (RAL) pola faktorial 2x2x3 dengan 3 ulangan. Faktor A yaitu Penggunaan Hypocloride, A1= tanpa direndam dengan Hypocloride, A2= direndam dengan Hypocloride, faktor B adalah penggunaan mulsa atau penutup, B1= ditutup spon, B2= tidak ditutup dengan spon, faktor C yaitu penggunaan larutan nutrisi, C1= penggunaan larutan nutrisi 100% larutan komersial, C2= 50% larutan komersial + 50 % Bioslurry, dan C3= 100% Bioslurry. Peubah yang diukur adalah tinggi tanaman, % perkecambahan, produksi biomas, kandungan nutrisi, dan kecernaan. Hasil penelitian menunjukkan bahwa penggunaan larutan nutrisi komersial AB mix sebagai media tanam menghasilkan tanaman hidroponik dengan produksi yang lebih baik. Penggunaan larutan bioslurry lebih dari 50% dapat menurunkan produktivitas tanaman. Penggunaan spon selama proses perkecambahan memberikan pengaruh terhadap produktivitas tanaman. Kombinasi perlakuan yang baik yaitu A1B1C1., Hydroponic Fodder is one technology that can be used to provide forage through hydroponic system. The purpose of this study was to observe the effect of hypocloride, mulch, and nutrient source on the productivity and quality of hydroponic maize. This study used a completely randomized design (CRD) with factorial pattern of 2x2x3 with 3 replications. Factor A1 was soaking with hypochlorite and A2 without soaking. Factor B1 was utilization of sponge as mulch, and B2 without mulch, the C factor was the use of a nutrient solution, nutrient solution C1=100% commercial solution, C2=50% commercial solution + 50% Bioslurry, and C3=100% Bioslurry. Effect of the treatment and their have been observed on germination percentage, plant haight, fresh fodder production and their proximate composition and their utilization the in vitro fermentability and digestibility. The results showed that utilization of commercial AB mix solution as nutrient sorce resulted the best corn fodder productivity. Utilization of bioslurry more than 50% reduced corn fodder productivity. The best treatment to produce Greenhouse fodder was combination A1B1C1.
Keyword: hidroponik, hipoklorit, jagung, larutan nutrisi, spon

Judul: Evaluasi Produksi dan Kualitas Nutrisi Hijauan Jagung (Zea mays L.) dari Penanaman Hidroponik
Abstrak: Hydroponic forage have a opportunity become as feed with fast growing and grow throughout the year. This research was conducted to evaluate production and nutrition quality of corn (Zea mays L.) forage from hydroponic cultivation. It used randomized block factorial design with 2 factors and 3 treatments. The first factor was seed density and the second factor was nutrient solution. Seed density were D1 (3.0 kg m-2), density D2 (3.5 kg m-2), density D3 (4.0 kg m-2) and nutrient solution factor include of nutrient solution B1 (Bioslurry 0% + commercial solution 100%), nutrient solution B2 (Bioslurry 25% + commercial solution 75%), nutrient solution B3 (Bioslurry 50% + commercial solution 50%). The result showed that treatments were not significant in nutrient content, VFA and NH3 of corn hydroponic forage, and it gave a significant result to Dry Matter in Vitro Digestibility (DMIVD) and Organic Matter in Vitro Digestibility (OMIVD). The other result showed that treatment of seed density 3.5 kg m-2 and substitution of 75% commercial solution with 25% bioslurry gave the best result for corn hydropinic forage production
Keyword: hydroponics, density, corn, bioslurry

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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