Dry Weight Estimation of a Soybean Cultivar ‘Satonohohoemi’ using the Main Stem Diameter

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  • 主茎径を用いたダイズ品種「里のほほえみ」の乾物重予測

Abstract

<p>A method was developed to estimate individual dry weight of soybean cultivar ‘Satonohohoemi’ using the main stem diameter. Specifically, a quadratic regression model was developed for each of six developmental phases (1: VC to V3, 2: V4 to V6, 3: vegetative phase after V7, 4: R1 to R3, 5: R4 to R6, 6: R7 to R8), using main stem diameter as an explanatory variable and individual aboveground dry weight as a response variable. The estimation accuracy was examined using the serial numbers of the plots in which the cropping season and planting density were varied (from April to August, about 6 to 38/m2) as the random effect. The estimation accuracy examined with the random effect was not significantly different from that examined without it, suggesting that the difference in the relationship between the main stem diameter and aboveground dry weight with the cropping season was small. Therefore, the estimation equation was considered to be applicable in a wide range of conditions. When the random effect was removed and analyzed by dividing the developmental phases in detail, a prediction could be made with a weight error of 11% to 37%, although there was some difference with the developmental phase. The change in the slope of the estimation equation by developmental phase was considered to represent the ratio of the growth of other organs to the enlargement growth of the stem, which increased after V7, peaked during R6, and decreased in R7 to R8.</p>

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