THE SYNERGY EFFECT OF APPLICATION OF PGPR (AZOTOBACTER CHROOCOCCUM) AND BIOSAKA ELICITOR ON VARIATIONS IN NPK FERTILIZER APPLICATION ON GROWTH RATE AND YIELD OF CUCUMBER PLANTS (CUCUMIS SATIVUS L.)

• Main Author: Gustri Qawwiyyu, Amanda
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/82868
• Institution: Institut Teknologi Bandung

Cucumber (Cucumis sativus L.) is a vegetable-like horticultural crop that belongs to the gourd family (Cucurbitaceae) and is in great demand in Indonesia. As the world cucumber market increases in the next five years at a CAGR of 4.5%, the demand for cucumber will also increase. However, cucumber productivity in Indonesia is still very low when compared to cucumber productivity in other countries, especially China. Efforts to increase the productivity of cucumber plants can be achieved by applying biosaka elicitors, compost, PGPR (Azotobacter chroccocoum), and NPK fertilizers. The use of biosaka elicitors and compost fertilizers aims to reduce dependence on synthetic chemical fertilizers which are increasingly expensive and not friendly to the environmental ecosystem. Soaking seeds in PGPR can accelerate the germination process. The purpose of this study was to determine the effect of variations in the application of biosaka elicitor and NPK fertilizer, variations in seed soaking in PGPR, synergy of biosaka elicitor, NPK fertilizer and PGPR, as well as the effect of the total population of Azotobacter chroococcum microorganisms on the growth and yield of cucumber plants. This study used a Randomized Group Design (RAK) with two factors. Factor I is the treatment with PGPR which consists of 2 levels, namely A1: with PGPR and A0: without PGPR. Factor II is the percentage of NPK fertilizer application and biosaka elicitor with 3 levels, namely P1: 0% NPK fertilizer + biosaka, P2: 50% NPK fertilizer + biosaka, P3: 100% NPK fertilizer without biosaka. The control treatment was P0: no fertilizer and no biosaka. Before planting, cucumber seeds were soaked in Azotobacter chroococcum suspension (108 CFU/ml) for 6 hours. The cultivation process was carried out in a greenhouse (screenhouse) with an average temperature range of 22-27.1°C and an average humidity percentage range of 53-90% for 8 weeks and data collection of growth profiles was carried out every 1 week. The application of biosaka was done every 5 days and the supply of NPK fertilizer every 7 days after 2 weeks after planting with a variation of NPK concentration per polybag, namely 0%; 50% (0.36 g) and 100% (0.72 g). The results showed that the application of biosaka elicitor, NPK fertilizer concentration and seed soaking in PGPR Azotobacter chroococcum showed an increase in cucumber plant growth and gain variables, and the number of Azotobacter chroococcum microorganism populations after planting increased. The synergy of biosaccharide elicitor and seed soaking in PGPR (P2) which resulted in the best plant yield, showed that cucumber cultivation can be done more environmentally friendly and less