Effect of hermetic low-pressure storage condition on rice seed quality and storage insects

Abstract

Seed qualities of rice storage under hermetic low-pressure, fumigation, temperature and humidity control conditions were studied. The experiment was arranged in split-split plot design in Completely Randomized Design (CRD) with 4 replications. Five storage conditions consisted of 1) jute bag at 15°C-45%RH 2) hermeticlow-pressure at room temperature (25-35 °C, 76-91%RH) 3) jute bag at room temperature with phosphine fumigation 4) closed container at room temperature and 5) jute bag at room temperature as main plot. Seven storage periods of 0, 2, 4, 6, 8, 10 and 12 months was sub plot. The results revealed that rice seed storage in jute bag at 15°C-45%RH and hermetic low-pressure at room temperature had higher in germination percentage tested by top of paper and sand method, vigor by accelerated aging (AA) and germination index than those of jute bag at room temperature with phosphine fumigation, closed container at room temperature and jute bag at room temperature. Rice seed storage in jute bag at room temperature had the highest in number of insect. Rice seed storage in 15°C-45%RH and hermetic low-pressure at room temperature could store for 12 months. While, rice seed storage in closed container at room temperature, jute bag at room temperature with phosphine fumigation and jute bag at room temperature could store for 6, 4 and 4 months, respectively by germination tested by top of paper and sand method and vigor by AA still higher than 80%. As storage period increased, germination tested by top of paper and sand method, vigor by AA and germination index decreased, while number of insect increased.