Blackspot of Russet Burbank potatoes and the carbon dioxide content of soil and tubers |
| |
Authors: | R Kunkel M L Weaver N M Holstad |
| |
Institution: | 1. U.S.D.A., Albany, California
|
| |
Abstract: | These studies were designed to elucidate the influence of CO2 on blackspot susceptibility of Russet Burbank potatoes. The influence of tuber CO2 environment on blackspot was tested. Tubers from 1–4 and 6–8 inches deep in the soil were scored for blackspot and moisture samples were taken from their vicinity. Blackspot was worse in shallow tubers and in tubers from drier soil. Plowing under corn stover, covering the soil with plastic, and excessive irrigation failed to cause blackspot susceptible tubers. Diffusing CO2 into the soil atmosphere under plastic sheets slightly increased the intensity of spot discoloration but the discoloration was atypical blackspot. Effects on blackspot by changing tuber gases was tested. Tubers whose gases had been evacuated and replaced by O2, N2, and CO2 had lower blackspot scores than untreated tubers. Increasing the time tubers were soaked in water after gaseous evacuation reduced blackspot. Hydration consistently decreased tuber blackspot. In chemical studies, tubers were tested for blackspot and analyzed for CO2 content. The relationship between tissue CO2 and blackspot appeared to be inverse. Tuber CO2 content was not influenced by time of day. Tuber blackspot scores immediately, 1, 3, and 7 hours after digging were the same, but tissue CO2 content increased linearly with time after harvest. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|