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: Production and Quality of Forage Maize Pertiwi 3 Varieties given Different Fertilizer Treatment and Harvesting Age in The Green Fodder System
Abstrak: Penelitian ini bertujuan mengevaluasi produksi dan kualitas jagung varietas Pertiwi 3 yang ditanam secara green fodder. Penelitian ini menggunakan rancangan acak kelompok faktorial yang terdiri dari 3 faktor nutrisi yaitu P1 (kontrol), P2 (larutan pupuk organik cair NASA), dan larutan anorganik P3 (AB Mix), dan 3 faktor umur panen yaitu T1 8 hari setelah tanam (HST), T2 12 HST dan T3 16 HST dengan 4 ulangan kelompok. Data dianalisis dengan Analysis of Variance (ANOVA) dan dilanjutkan dengan uji Duncan. Hasil penelitian menunjukkan bahwa terdapat pengaruh interaksi yang signifikan antara larutan hara dan umur panen. Pemberian larutan nutrisi AB Mix dan umur panen 16 HST meningkatkan tinggi tanaman, ketebalan akar dan biomassa segar hijauan secara nyata. Namun, aplikasi larutan nutrisi AB Mix tidak mempengaruhi kualitas hijauan jagung. Perlakuan pupuk anorganik AB Mix dan umur panen 16 HST menghasilkan kualitas jagung pakan hijau terbaik dengan bahan kering 14,77%, protein kasar 21,97% dan serat kasar 14,47%., The experiment aimed to evaluate the biomassa production and the quality of corn Pertiwi 3 Varieties given different fertilizer treatment and harvesting age. This study used factorial blok randomized composing of 3 nutrition factors, namely P1 (control), P2 (liquid organic fertilizer solution NASA), and P3 (anorganic AB mix solution), and 3 harvesting age factors, namely T1 8 day after sowing (das), T2 12 das and T3 16 das with 4 group replications. Data were analyzed with Analysis of Variance (ANOVA) and further followed by Duncan test. The results showed that there was a significant interaction effect between nutrietion solution and harvesting age. Application of AB mix nutrition solution and 16 das harvests significantly increased the height of the plants, root thickness and fresh biomass of green fodder. However, application of AB mix nutrition solution did not affect green fodderquality of corn. Anorganic fertilizer treatment AB mix and 16 das resulted in best green fodder corn quality with dry matter 14.77 %, a crude protein 21.97 % and crude fibers 14.47 %.
Keyword: green fodder, harvesting age, nutrition solution

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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