抄録
With forage turnip (variety: Shimofusakabu) cultivated in the different amount of fertilizer application and different intrarow spacing as materials, the effects of random plant-missing treatment on the yield was investigated. 1. The yield per plant increased by the missing trestment. The increasing rate of the yield inclined to be higher in root than in top and also in dense spacing than in sparse spacing. k. Coefficient of variation (c.v.) of the yield among plants which showed as a rule higher value than other crops, was increased by the treatment. In this case the change of the c.v. was influenced directly by two factors accompanied with the treatment, i.e. the nonuniformalizing the intrarow spacing and the doubling the mean intrarow spacing, and the increasing degrees of c.v. caused by the former factor exceeded the decreasing degrees of c.v. caused by the latter factor. 3. Though the missing plant increased the yield of the neighboring ones, the increasing rate of yield, namely, the compensative ability for missing plant was seemed relatively low, and even the continuous missing of plants hardly rose the increasing rates of the yield in neighboring plants. 4. The yield per unit ares was always decreased both in top and root by the same two factors accompanied with the treatment as alresdy seen in the change of the c.v. of the yield, and the doubling the intrarow spacing exert a greater influence on the yield in comparison with the nonuniformalizing the intrarow spacing under the sparse spacing condition, while under the dense spacing condition those two factors reduced the yield to similar extent.
