Efficacy of Rice Hull Ash against Bacterial Leaf Blight, Xanthomonas oryzae pv. oryzae

Yvette D Medrano,Ricardo B Casauay,Gerald M Duza,Lyle Gavien L Alcomendras,Andrea F Dawan

doi:10.17485/ijst/v14i37.570

Abstract

Objectives: Silica is not essential nutrients for plant growth; however, it shows that it is beneficial to rice, especially under stress conditions. This study is to test the efficacy of Rice Hull Ash (RHA) as a silicon source to enhance rice resistance against bacterial leaf blight, Xanthomonas oryzae pv. oryzae. Methods: The Complete Randomized Design (CRD) was adopted for the different treatments, replicated four (4) times. CSUT0 (control), CSUT1(30 grams RHA, Basal Application), CSUT2(30 grams RHA, Basal Application; 15 DAT), CSUT3 (30 grams RHA, Basal Application; 15 DAT and 30 DAT), and CSUT4 (30 grams RHA, Basal Application, 15 DAT, 30 DAT; and 40 DAT). The effect of all the treatments is on the severity of infection of the bacteria, plant height and wt.% of SiO2 acquired from soil, RHA and test plant. Findings: Rice Hull Ash (RHA) composed of 87.34 wt. % of SiO2 while soil collected from the Rice Field composed of 68.49 wt.% of SiO2, Disease resistance is as high as 60% when compared with the highest infection rate (T0) to the lowest infection rate (T4). Plant height and resistance produced against BLB infection was observed significantly in CSUT3 (Basal application at 15 and 30 DAT and 30 grams of RHA). Novelty: The study offers an interesting organic alternative that could be used in controlling Bacterial Leaf Blight (BLB). Keywords: Bacterial Leaf Blight; Rice; Rice hull ash (RHA); Resistance Mechanism; Silica (SiO2)

Highlights

Rice is considered an ancient domesticated cereal food crop and is arguably the most important staple food for people (1), concentrated production is in Asia as a primary source of food for more than half of the world population(2)
This study aims to (1) determine the wt % of silicon present in the soil gained in the field, rice hull ash, and test plant, (2) evaluate the different level of rice hull ash, and assess which among these levels will develop a defense mechanism against bacterial leaf blight (BLB)
Results of the analysis revealed that the Rice Hull Ash (RHA) was composed of 87.34 wt. % of SiO2 and the Soil that was collected from the Integrated Farm, Rice Field is composed of 68.49 wt. % of SiO2

Summary

Introduction

Rice is considered an ancient domesticated cereal food crop and is arguably the most important staple food for people (1), concentrated production is in Asia as a primary source of food for more than half of the world population(2). Mono silicic acid residues in the cells as hydrated deposits, and it will move by evaporation of polymerized silica to force a cellulose silica membrane making the rice hull relatively flaky, brittle, and abrasive It is composed of 89% - 97% of silica, if undergone incomplete combustion, making it a good source of silicon(4). Most farmers in the Philippines usually use synthetic pesticides to control pests and diseases. The continues application of synthetic pesticide have posed a significant challenge to the target pest organism causing to disperse to a new environment, or they will adopt new conditions(10). It negatively affects humans, animals, and the environment. Scientists are continuously finding and developing other alternative control to pests and diseases, which are economical, effective, and eco-friendly

Objectives

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Conclusion