The Effect of Plant Growth Regulators and Planting Density against Viral Infection and the Production from Bulbs of True Shallot Seed in the Highlands

Abstract

In general shallots are cultivated using bulbs (vegetatively). The problem is the cost of controlling bulbs is quite high, which is around 40% of the total. One way to increase the productivity of shallots is by using healthy plant material through using of True Shallot Seeds (TSS). TSS is one of the generative propagation methods of shallots from seed. The research was carried out at the Indonesia Vegetable Research Institute in Lembang (plateau 1250 asl). Time of implementation from August 2017 to April 2018. Research is conducted in the Field and laboratory. The experimental design used is a factorial randomized completely block design with two factors repeated 3 times. The first factor type of Plant Growth Regulators consists of: A.1=BAP concentration of 50 ppm, A.2=NAA concentration of 50 ppm, A.3=GA3 concentration of 50 ppm, A.4=Control. The second factor is planting density: B.1. Planting density of 5 gram of seeds/m2, B.2=Planting density of 7 gram of seeds/m2, B.3=Planting density of 9 gram of seeds/m2. The results of the study show that: (1). The giving of Plant Growth Regulators (BAP, NAA and GA3) does not affect the germination of True Shallot Seed and plant growth, the number of living plants and tuber yields in the field. (2). planting density affects plant growth in the field and green houses are 5 gram of seeds and 7 gram of seeds/m2 land area. (3). The results of the Elisa test on leaf samples not detected SYSV, OYDV and LYSV viruses. (4). Planting density of 7 gram of seeds/m2 land area has a good effect on tuber yields in the field. The number of cloves produced in the field is 1 to 5 clove.