Selection and Correlations of Character Agronomy of Onion (Allium cepa L.) Var. Bima in Salinity and Drought Condition In Vivo

Abstract

Onion exports need to be increased through increased production. However, the area of land for the cultivation of this commodity has diminished due to the conversion of land to settlements and industry so that only marginal land is not productive for onion cultivation. This study aims to estimate the agronomic characters capable of being used as an indirect selection on the character of salinity and drought conditions and to obtain genotypes of onion are able to adapt to the artificial conditions of salinity and drought in vivo. Genetic material used is Bima onion bulbs with augmented design with a spaced planting system, with a spacing of 20 cm x 20 cm, and each hole contains 1 shallot bulb using a head-to-row system. This study uses a combination of NaCl and PEG 6000 as a salinity and drought selection agent. The results of this study indicate that agronomic characters that have a strong and positive correlation value and can be used as a direct selection character for the vegetative phase, namely root volume and root length, generative phase, namely age of harvest and yield components, namely the weight of parent plant tubers, the weight of saplings and tuber weights per plant. There are nine genotypes suspected to be able to adapt to artificial conditions of salinity and drought in vivo, namely S3-1, S3-2, S3-3, S4-1, S4-2, S4-3, S5-1, S5-2, and S5-3 resulted from Scatterplot analysis for two variables and from a comparison of five parameters to tuber weights per plant.