00171262

open access

Version of Record

ダイズ ノ ムゲン シンイクセイ ノ イクシュガクテキ イギ ダイ6ホウ ユウゲン ムゲン シンイクセイ ヒンシュ ノ トウフク テイコウセイ ノ サイ ト ケンテイ ホウホウ トクニ ソノ セイイク ジキ ニヨル ヘンカ ニツイテ

Japanese (日本語)

兵庫農科大学・神戸大学農学部研究報告

8(2)

69-74

兵庫農科大学

1968

2014-05-20

本文ファイルは、国立情報学研究所CiNiiより提供されたものです。

Relationship between the growth habit and the degrees of lodging resistance was investigated by using three varieties in the previous report. The difference in bending weight between spaced and solid planting plots was larger in the varieties of determinate growth, Tokachi Nagaha and Shirasaya No.1. The indeterminate type variety, Harosoy appeared to be less in the degrees of decrease of bending weight by solid planting, though the variety was less in the weight consistently than the determinate varieties in the spaced planting plot. Referring to the growth stage, it was found throughout all varieties used that the bending weight increased till third or forth week after the beginning of flowering and showed little change thereafter. Then, the period from fourth to fifth week after the beginning of flowering seems to be adaptable time of measuring the lodging resistance of soybeans (Fig. 1). Structual mechanism of lodging in the solid planting plots was observed as follows : (1) the indeterminate variety had a less uniform curve of bending and a shorter horizontal axis of the curve (Fig. 2) : (2) the resistant force to bending of the stem of the indeterminate variety was greater in the base and decreased sharply towards the top (Fig. 3) : (3) such facts were also relating to the lower center of gravity of the indeterrminate variety than the determinate varieties (Fig. 4). An adaptable method of testing and index of lodging resistance were considered. The safety factor by KATO was calculated higher in the indeterminate varieties in contrast with the cLγ by GRAFIUS which was calculated higher in the determinate varieties (Fig. 5-1). Other methods modified by combinning both of the methods were also tested. The ratios of the bending weight to the height of center of gravity (F/b') and to the product of the green weight times the stem length (F/bW) appeared to be useful factors showing the difference in lodging resistance between the determinate vs. indeterminate type soybeans (Fig. 5-2), but classification of strains into two groups of indeterminate vs. determinate growth seemed to be rather better procedure in testing the lodging resistance.

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