PENINGKATAN LAJU PERTUMBUHAN UWI PUTIH (DIOSCOREA ROTUNDATA) MELALUI VARIASI KONSENTRASI PUPUK NPK, UKURAN BIBIT, PEMBERIAN PGPR (AZOTOBACTER CHROCOCCUM) SERTA PEMBERIAN ELISITOR

• Main Author: Salsabiila Azhaari, Rania
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/76294
• Institution: Institut Teknologi Bandung

White yam (Dioscorea rotundata) is highly valued as a food source due to its high carbohydrate and starch content. However, the development of white yam is still limited due to its long dormancy period and the requirement of a large number of seedlings. In an effort to reduce the need for seedlings, yam can be propagated using yam tuber cuttings as planting materials. Plant Growth Promoting Rhizobacteria (PGPR) have been proven to accelerate shoot and root growth. The use of NPK fertilizer balanced with compost can fulfill the nutrient requirements of plants. Biosaka used as elicitor play a role in enhancing plant defense systems. This study was conducted to observe the effects of PGPR Azotobacter chroococcum and biosaka elicitors, as well as the effects of variations in seedling mass, concentrations of NPK fertilizer with compost balance on the growth and yield of white yam. The study employed a Randomized Complete Block Design (RCBD) with two factors. Factor I consisted of three levels of seedling mass: M1: 50 g, M2: 100 g, and M3: 200 g. Factor II consisted of five levels of NPK fertilizer concentration with biosaka: P1: 0% NPK fertilizer + biosaka, P2: 10% NPK fertilizer + biosaka, P3: 25% NPK fertilizer + biosaka, P4: 50% NPK fertilizer + biosaka, and P5: 100% NPK fertilizer + biosaka. There were three types of controls: K2: 100% NPK fertilizer without biosaka, K1: without fertilizer and without biosaka, and K2: without fertilizer + biosaka. Prior to planting, yam seedlings were soaked in Azotobacter chroococcum suspension (40 g/liter) for 6 hours. NPK fertilizer (20:20:30 %) was applied at 1 and 4 weeks after planting (WAP), with the same dosage, and compost was applied at 4 WAP. Biosaka elicitors were sprayed on the plants every 10 days. The planting of white yam lasted for 154 days after planting (DAP). The results showed that planting with 200 g seedlings (M3) and applying 25% NPK fertilizer (P3) supplemented with seedling biopriming and biosaka elicitors provided the best growth profile, including plant length, leaf count, and growth rate. Planting with 200 g seedlings (M3) and applying 10% NPK fertilizer (P2) supplemented with seedling biopriming and biosaka elicitors resulted in the highest yield of white yam compared to other variations.