Multiple Regression Analysis of Malting Barley Yield and Climatic Conditions in Kyushu Region

[摘要] Multiple regressions of six malting barley cultivars between yield and climatic conditions in Kyushu region over years were computed by backward and forward procedure. Phenotypic correlations between yield and mean temperature, total precipitation and total sunshine duration during the whole growing period (Dec. 1-May 20) were generally negative, negative and positive, respectively. Multiple regression analysis showed, however, that only precipitation contributed yield adversely. The negative phenotypic correlations between yield and temperature suggested that high temperature caused yield decrease, but this was because of the positive correlation between temperature and precipitation, and the influence of temperature on the yield was little. The influence of sunshine duration to yield was also little. Regression coefficients showed that yield decreased at the rate of 4-6 kg/ha per additional 1mm precipitation. The number of ears was restricted by precipitation, resulting in yield decrease. Growing period was devided into two stages; before heading and after heading. Regressions were computed between yield and climatic conditions before and after heading for three cultivars. Precipitation in both of the growing period before and after heading date caused yield decrease. Therefore, high precipitation or wet injury was the main restriction to higher yield of malting barley in Kyushu region.

[学科分类] 农业科学（综合）

[关键词] Climatic condition;気象要因;Malting barley;降水;Multiple regression analysis;湿害;Precipitation;重回帰分析;Wet injury;ビール大麦