Bird pest attack and sound characteristics of bamboo traditional instruments as bird pest repellent on rice fields in Bali
The purpose of this study was to observe the attack of bird pest and examine Balinese bamboo traditional instruments, (in local language called kepuakan), as a repellent of bird pest. The research method used is the survey method, sample testing, or a combination of both. For bird pest attack, the survey results show that damage in rice panicles can reach 75% more. For kepuakan, the results of the survey and testing of the kepuakan samples in three rice planting centers, namely Tabanan, Badung, and Gianyar regencies, showed that kepuakan was made of bamboo rope (Giganlochloa apus) and jajang bamboo (Giganlochloa ridleyi) with various dimensions, length from 39.0-75.2 cm, diameter from 4.7-6.6 cm, thick bamboo from 0.4-0.8 cm. Sound characteristics produced by kepuakan are similar to knocking sound with the maximum sound pressure level varies from 101-112 dB at 10 cm distance and with frequency interval between 509-1,889 Hz with an average frequency of 1,205 Hz which is still within the range of hearing of birds. Based on the results of the characteristic test, the instrument of kepuakan is still feasible and safe to use as bird pest repellent on rice fields.
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