陸地棉の開花開絮に関する栽培学的研究 : 5. Horizontal direction における開花開絮の規則性と各の繊維諸形質

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From the results of the experiment with Upland cotton plant (variety Kanno No.1), the authors found a decided tendency toward regularity in blooming and opening, the vertical intervals being approximately three days, the horizontal intervals being approximately seven days, and the correlation between the days from sowing to blooming and the days from blooming to opening being high positive. As the sowing time becomes later, the number of opening bolls on each fruiting branch tends to decrease, and the vertical and horizontal node bearing the opening boll become lower. The seed cotton weight and lint weight in horizontal bolls tend to decrease as the sowing time becomes later and the days from blooming to opening becomes longer. The tensile strength and the thickness of wall also tend to decrease as the period becomes longer. Especially, a good fibre obtained in the bolls necessary to 54 to 64 days from blooming to opening. That is, 20 to 25℃ in daily average temperature is necessary to maintained over a long time during the growth of boll to get a mature fibre, while a good seed is obtained in slightly lower than optimum temperature for the growth of cotton fibre. The characters of cotton fibre in horizontal bolls were inferior to vertical ones, although the bolls required the same period to open under same meterological condition. It shows that there is a considerable difference in the supply of raw materials toward the vertical and horizontal bolls because the appearance of successive fruiting branches (horizontal branches) is sympodial. Finally, a practical advantage was gained for the reasonable pinching position of vertical and horizontal direction of cotton plant from these results.
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陸地棉の開花開絮に関する栽培学的研究 : 5. Horizontal direction における開花開絮の規則性と各の繊維諸形質

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