甜菜是二年生作物,一个生育周期需时两年,即第一年培育母根,秋季收获,经窖藏,第二年春天移栽到大田采种。这样母根需要起收、修削、运输、挖窖、窖藏。第二年再开窖、出窖、运输、栽植等多工序劳动。不但大量花费劳、畜、动力、费工费时,而且往往出于掌握不好窖藏规律,而影响母根顺利渡过阶段发育,从而影响种子产质量,甚至造成烂窖的损失。露地越冬试验的目的,就是打算寻找我省越冬基本条件的地区,加上适当的保护性农业技术措施,当年 Beets are biennial crops, a fertility cycle takes two years, that is, the first year of nurturing parent roots, autumn harvest, the cellar, the next spring transplanting to the field seed. This mother need to take root, repair, transport, digging cellar, cellar. The second year and then open the pit, a pit, transport, planting and other processes of labor. Not only spend a lot of labor, livestock, power, labor-intensive time-consuming, and often out of the possession of a good law of cellaring, and affect the mother through the stage of development smoothly, thus affecting the quality of seed production, and even cause the loss of the cellar. The purpose of the open-air test is to look for the basic conditions for winter in our province, together with appropriate technical measures for conservation agriculture, the year