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Asian Journal of Plant Pathology
  Year: 2011 | Volume: 5 | Issue: 4 | Page No.: 134-145
DOI: 10.3923/ajppaj.2011.134.145
Effects of Silicon in Suppressing Blast Disease and Increasing Grain Yield of Organic Rice in Northeast Thailand
W. Wattanapayapkul, A. Polthanee, B. Siri, N. Na Bhadalung and A. Promkhambut

Abstract:
Infestation of rice by the leaf blast disease caused by Pyricularia oryzae is frequent and results in severe yield losses and high production costs. Silicon has been reported to have potential for controlling the blast disease in rice. The objectives of this study were to determine the effects of silicon in suppressing the blast disease and increasing the grain yield of organic rice in northeast Thailand. Field experiments were conducted in farmers’ fields in two locations in Northeast Thailand, Buriram (experiment 1) and Surin (experiment 2) provinces. Both experiments used a randomized complete block design with four replications. Treatments consisted of four silicon application rates of 0, 250, 500 and 1,000 kg ha-1. Results showed that silicon applied to rice suppressed occurrence of the blast disease. Values of a severity index of leaf blast and neck blast were significantly decreased when silicon was applied at the rate of 250 to 1,000 kg ha-1 in comparison with the control treatment without silicon in both locations. At the highest silicon application rate, 1000 kg ha-1, leaf and neck blast severity were reduced by 83 and 75% in experiment 1 and 81 and 77% in experiment 2, respectively. Grain yield when silicon was applied was 19-43% higher than the control in experiment 1 and 2-14% higher than the control in experiment 2. The maximum grain yield was obtained at the rate of 1,000 kg ha-1 in both locations (4,538 and 4,070 kg ha-1 in experiments 1 and 2, respectively). The yield obtained when silicon was applied at the rate of 1000 kg ha-1 was not significantly different from that obtained at the rate of 500 kg ha-1 in experiment 1, but it was significantly higher in experiment 2.
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How to cite this article:

W. Wattanapayapkul, A. Polthanee, B. Siri, N. Na Bhadalung and A. Promkhambut, 2011. Effects of Silicon in Suppressing Blast Disease and Increasing Grain Yield of Organic Rice in Northeast Thailand. Asian Journal of Plant Pathology, 5: 134-145.

DOI: 10.3923/ajppaj.2011.134.145

URL: http://scialert.net/abstract/?doi=ajppaj.2011.134.145

 
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