论文部分内容阅读
脱毒马铃薯投放大田后重新感染病毒病。其重新罹病的程度、速率和大田连续种植代数、海拔高度等密切相关。在海拔2000m左右的地区,脱毒薯的有效种植年限至多为3代;当海拔升至2400～2700m,到第3代时,病情指数低于5%,可保持高产,若连续种植5～6代,则病情剧增,丰产性丧失;在海拔2800m的农区,重新感病速率接近于零。因此在高寒农区设置原种繁殖基地,并建立梯级循环繁种供种体系,是保持其高产势能的有效措施。
Virus-free potato re-infected with the virus after being put on the field. The extent of its re-morbidity, the rate and field continuous planting algebra, altitude and other closely related. At 2000m above sea level, the effective planting time of virus-free tubers is up to 3 generations. When the altitude rises to 2400 ~ 2700m, by the 3rd generation, the disease index is below 5% On the other hand, the disease will increase rapidly and the high yield will be lost. In the agricultural area of 2800m above sea level, the rate of re-infection will be close to zero. Therefore, it is an effective measure to maintain its high yield potential by setting up breeding bases of original breeds in the alpine region and establishing cascade circulation breeding systems.