Considerations on Rice Yield Estimation from the Viewpoints of Crop Science : On a Synthetic Coefficient for the Ddcisive Factors in Yield Estimation

[摘要] 1. In the practise of estimating yield of rice crop, the blasted grains being included in the number of the paddy ones, it is very difficult to discriminate them. The author traced experimentally the process where some of the mature grains drop out through the grain fan and huller. 2. The rate of remaining after hulling was in proportion to the fertilization rate of then. The fertilization rate held a certain parallel connection with the blasting rate, and in many cases, blasted grains were found to drop, being confused with the empty husks, into the second box of the grain fan. The remaining rate of kernels, as the fertilization rate showed large variations both being strongly affected by weather conditions of the year and to certain extent by the plant variety. The number of kernels per unit volume, however, gave but smaller varietion, being characteristic of the variety. 3. The author discussed on the usage of a synthetic coefficient applciable to the number of grains per 1.8L, in yield estimation of rice, and concluded that considerations from the viewpoint of crop-sciense should be necessary for estimation of fertilization rate and the number of kernels per unit volume as “operators"in practise of rice yield estimation.

[学科分类] 农业科学（综合）