Journal of Taiwan Agricultural Research

Author:Jeng-Chung Lo and Yi-Shin Chen

Abstract:

This research was conducted from the second crop season of 1998 to the first crop season of 1999, a total of 134 samples for advanced yield trial were concluded. First, we evaluated the cropton value (Y) of the 134 advanced lines. Then, samples were investigated of their weight, moisture content and milling ratio of brown rice for estimating the plot-yield (g/97 plants) (X₃) and milling yield of brown rice (kg/l0acre) (X₆). The whole data was split into two portions. One of which contained 3/5 of the 134 samples (as the estimation data) was used to estimate the model parameters. The other (as the validation data) was reserved to check the prediction accuracy of the developed model. The sampling variation of the estimated parameter was examined empirically by a first-order jackknifing from the estimation data. It shows that the estimates of the parameters of a prediction model were quite stable. This model was then tested and updated by the validation data, with a satisfactory result for each yield by cropton value:

X₃ = (Y + 54.5) / 0.1973 (for plot-yield)

X₆ = (Y + 52.3) / 1.0586 (for milling yield of brown rice)

Results show that the cropton value can be applied for rice yield trial to promote the efficiency of rice breeding procedure.

Key words:Rice, Cropton, Yield, Milling yield of brown rice

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