PENINGKATAN LAJU PERTUMBUHAN UWI UNGU MELALUI VARIASI KONSENTRASI PUPUK NPK, BOBOT BIBIT, PEMBERIAN PGPR (AZOTOBACTER CHROOCOCCUM) SERTA PEMBERIAN ELISITOR

• Main Author: Alfarizky Elbaary, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/76979
• Institution: Institut Teknologi Bandung

The use of marginal land can support the stability of food security and can improve the welfare of farmers. Purple yam (Dioscorea alata) is a carbohydrate source plant that is tolerant to marginal land. However, the productivity of Dioscorea spp. still quite low and were not optimally cultivated in Indonesia. Increasing the productivity can be done by applying compost, NPK fertilizer, biosaka elicitor, and Plant Growth Promoting Rhizobacteria (PGPR) Azotobacter chroococcum. PGPR Azotobacter chrococcum is used as a supporter of nitrogen fixation bacteria and helps break seed dormancy phase. Compost and NPK fertilizers are used as the main sources of macro-nutrients. Biosaka is used as an elicitor that signals a systemic defence system and reduces the use of chemical fertilizers. The right combination is needed in uwi cultivation to get the most economical production system. In this study were observed: the effect of variations in the size of the weight of the seedlings (50 g; 100 g; 200 g) which had been treated with bio-priming with PGPR Azotobacter chroococcum, the effect of the percentage of NPK fertilizer which was compensated by compost, and the effect of elicitor biosaka on growth and acquisition of purple uwi plants. This study used a randomized block design (RBD) with two factors. The first factor was the weight of the seedlings which consisted of 3 levels, namely 50 g (M1), 100 g (M2), and 200 g (M3). Factor II was the concentration of NPK fertilizer and elicitor application with a combination consisting of P1(0% NPK + 100% Compost + Elicitor); P2 (NPK 10% + Compost 90% + Elicitor); P3 (25% NPK + 75% Compost + Elicitor); P4 (50% NPK + 50% Compost + Elicitor); P5 (100% NPK + 0% Compost + Elicitor); K0 (100% NPK + 0% Compost - Elicitor); K1 (0% NPK + 0% Compost - Elicitor); and K2 (0% NPK + 0% Compost + Elicitor). Cultivation was carried out for 18 weeks and data collection of growth profiles was carried out every 2 weeks. Fertilization using NPK fertilizer (20:20:30%) was carried out at the same dose at 1 WAP and 4WAP (week after planting). Elisitor biosaka is sprayed over the plants every ten days and the plants are watered every three days. The research results showed that planting using 100g (M2) seeds with 25% NPK fertilizer (P3) assisted by bio-priming seeds and applying biosaka elicitor gave the highest growth profiles, such as plant length, number of leaves, number of shoots, and number of branches higher than other variations. Planting using 100 g (M2) seeds with 10% NPK fertilizer (P1) assisted by seed bio-priming and biosaka elicitor gave the highest purple uwi tuber mass gain compared to other variations.