Abstract. Azizah N, Wijayanto N, Wirnas D. 2019. The growth and rooting dimensions of the Local and Solomon Albizia in the agroforestry system. Biodiversitas 20: 3018-3023. Albizia (Falcataria moluccana (Miq.) Barneby & J.W.Grimes) is one of the leguminous plants that has a fast-growing character and profitable wood. Some types of albizia such as local albizia and Solomon albizia are cultivated by the community. Albizia planting can be integrated with crops such as upland paddy in agroforestry systems. Research on albizia planted in the agroforestry system was conducted to analyze the growth and root dimensions. This research was conducted for six months at the Cikabayan Field, Faculty of Forestry, IPB University, Bogor, West Java. This study was composed of two activities, those : (i) analyzing the effect of the albizia provenance on the growth of diameter, height, and canopy area, (ii) analyzing the root dimensions in agroforestry systems. The results showed that the albizia provenance had significant effect fo diameter, height, canopy area, and root length variable. F1 Solomon albizia has the best growth in all measured variables. F1 Solomon albizia has differed significantly with F2 Solomon and local albizia.

Fish skin can be extracted and hydrolyzed into collagen peptide to enhance the antioxidant activity. The research objectives were to determine the characteristics of collagen peptides from pangasius fish skin as antioxidants. The fish skin was extracted and hydrolyzed using 2% Alcalase and fractionated using a molecular sieve membrane. The gelatin yield was 15.07±1.45% against the starting material. The pH value of gelatin was 4.76±0.02. SDS-PAGE showed β band 221.3 kDa, α1 band 137.1 kDa and α2 band 117.7 kDa. The hydrolysis of gelatin resulted in the degree of hydrolysis of 48.06±1.97% with Alcalase at 55°C for 180 min. The total antioxidant activity (TEAC) was calculated with ABTS assays. The TEAC values were 24.53±0.78 μmol TE/g for the gelatin, 44.40±0.13 μmol TE/g for the peptides, 45.07±0.12 μmol TE/g for the >30 kDa fraction, 45.85±0.04 μmol TE/g for the 10-30 kDa fraction, 45.93±0.04 μmol TE/g for the 3-10 kDa fraction, and 45.98±0.04 μmol TE/g for the <3 kDa fraction.