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Micro- Weather Factors during Rice Heading Period Influencing the Development of Rice Bacterial Grain Rot

세균성벼알마름병 발병에 미치는 벼 출수기의 미기상 요인

  • Published : 2004.09.01

Abstract

To make the forecasting model of rice bacterial grain rot (RGBR) using the statistical procedures with SAS(Statistical Analysis System) based on micro-weather factors during heading period of rice, 21 rice varieties having the different heading time (40% panicles headed) were planted at 30 May and 15 June in Naju. Heading time and diseased panicles were investigated from July to August in 1998. RGBR mainly occurred on varieties headed from 29 July to 19 August, but not on varieties headed after 22 August. RGBR was highly correlated with diurnal temperature during 7 days (r =-0.871 **) and 10 days (r =-0.867**) and minimum relative humidity during 15 days from 3 days before heading time. After examining the models with several ways ($R^2$, Adjusted $R^2$, MSE), one equations were selected: Y =92.83 - 2.43Tavr + 1.88Tmin - 1.04RHavr + 0.37RHmin + 0.43RD - 3.68WS ($R^2$=0.824) using six variables of average and minimum temperature (Tavr and Tmin), average and minimum relative humidity (RHavr and RHmin), rainy days (RD), and wind speed (WS) during 7 days from 3 days before to 3 days after heading time.

세균성벼알마름병(RGBR)의 발생예찰 모델을 만들기 위하여 출수기가 다른 오대벼 등 21개 품종을 1998년 5월 30일과 6월 15일에 이앙하여 벼 출수기와 이병수율을 조사하고 출수기 전후의 미기상과 병 발생과의 관계를 SAS 프로그램을 이용하여 분석하였다. 세균성벼알름병은 출수기가 7월 29일부터 8월 19일 사이의 품종에서 대부분 발생하였고 8월 22일 이후에 출수한 품종에서는 전혀 발생하지 않았다. 벼 출수기를 기준으로 출수기 3일 전부터 7일(r=-0.871**), 10일(r=-0.863**)의 일교차와 15일(r=0.8709**)과 출수기부터 7일(r=0.862**), 10일(r=0.860**), 15일(r =0.844**) 동안의 상대습도와 높은 상관관계를 보였다. 결정계수($R^2$)와 수정된 결정계수($R^2$$_{adj}$), 잔차평균제곱(MSE)를 이용하여 예찰모델을 구한 결과, 출수 전 3일부터 7일 동안의 평균기온, 최저기온, 평균상대습도(RHavr), 최저상대습도(RHmin), 강우일수, 풍속의 6개 변수를 이용한 RGBR =92.83 - 2.437avr + 1.887min - 1.04RHavr + 0.37RHmin + 0.43RD - 3.68WS($R^2$=0.824)의 회귀식을 구할 수 있었다.다.

Keywords

References

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