Effect of dose and time of saline-tolerant Rhizobium sp. inoculation to productivity of black soybean (Glycine soja (l) merrit) on saline media

Abstract

Black soybeans are a food plant commodity that is used as raw material for making soy sauce because it can give a natural black color. This study aims to examine the effect of various doses and times of inoculation of saline-tolerant Rhizobium sp. Inoculum against the production of black soybean (Glycine soja (L) Merrit) on saline media. The research was conducted on 25 September 2019 - 20 February 2020 at the Green House and the Laboratory of Ecology and Plant Production, Faculty of Animal and Agriculture, Diponegoro University, Semarang, Central Java. The study used a completely randomized design with a 4x3 factorial pattern with 3 replications. The first factor is the inoculum dose, namely 0, 5, 10, and 15 mg/plant. The second factor is the time of inoculation, that are at planting, 7 and 14 Days After Sowing (DAS). The results showed that the inoculum dose of 15 mg/plant gave the highest yield on the variables of plant height, number of leaves, weight of seeds and weight of 100 seeds. Inoculum application at planting gave the best results on the variable number of leaves and seed weight. The interaction between dose and time of administration of Rhizobium sp. effect on pod and seeds weight.