Abstract
Two new improved strains of upland cotton named “Kinshu No.1” and “Kinshu No.2” were bred by the authors at the Agricultural Experiment Station of Manchuria. In original crosses of these strains, Kanno No.1 was used as mother plant. This Kanno No.1 was bred by separation of Kings Improved and cultivated hitherto as an only good strain in southem Manchuria.
Kinshu No.1 reached perfection in 1943 in the F7 generation of hybrids between Kanno No.1 and Gooch. Comparing with Kanno No.1 used as control, the new strain is 5 days early in the opening time of the bolls. In this strain, the percentage of ginned cotton to seed cotton is over 40, being 5% or more over that of the control. The production in ginned cotton is from 10% to 20% more than the control, Therefore this strain is suitable for cultivation in the northern part of the upland cotton zone in Manchuria.
The breeding of Kinshu No. 2 was completed in 1944 in the F8 generation of hybrids between Kanno No.1 and Acala. Although the opening time of the bolls is the same as that of the control, it has a higher percentage of ginned cotton, over 40%, similar to the new strain, Kinshu No.1 as mentioned above. Moreover the production of ginned cotton is from 20% to 30% more than the control, Kanno No.1. Therefore this strain is recommended to be used in all main part of the upland cotton zone in Manchuria.
