按照提出的生物学产量气候区的划分标准,进行试验的地区属低产区,其特点是比牧草喜温的作物所需的热量不足。在苏联科米自治共和国,马铃薯是主要的粮食作物,栽培的品种多为本地早熟类型,即使这样,也常因初夏、甚至七月份的霜冻而使马铃薯茎叶枯死。所以,如能改善土温的状 In accordance with the proposed division criteria for biological yield climatic zones, the areas under test are low-yielding areas characterized by insufficient calories required for crops that are fresher than pasture. In the Komi Autonomous Republic of the Soviet Union, potatoes are the main food crops and most of the cultivars are of the local precocity type. Even so, potato stems and leaves are often killed by frost in early summer or even in July. So, if we can improve the soil temperature shape