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一、引言扩大糖用甜菜的栽培地区是增辟糖源、进一步发展我国糖料生产的有力措施之一。我国中部地区现已普遍试种甜菜,以播种时期而论,可以春播或夏播,有些地区还可以秋播。在适于秋播的地区秋播较之夏播或春播有利之点是:播种期气温适宜,种子发芽良好,易于全苗,整个生育期病虫害较少,块根生长整齐,品质和产量都能达到一定的水平(2)。但秋播甜菜也存在一些问题,主要的是越冬返青后便要抽苔。抽苔后不仅消耗大量糖分,而且块根木质化,不适于作制糖原料。为避免这些不利影响,便须在抽苔前一般在
I. INTRODUCTION Expanding the cultivation area of sugar beet is one of the powerful measures to increase the sugar source and further develop the sugar production in our country. Beet is now commonly planted in the central region of our country, in terms of sowing time, it can be sowed in spring or summer, and in some areas it can be sowed in autumn. Autumn planting suitable for autumn sowing than summer sowing or spring sowing points are: suitable sowing temperature, seed germination is good, easy to whole seedlings, less pests throughout the growing period, root growth and tidy, quality and yield can be achieved A certain level (2). But there are also some problems with autumn sowing sugar beets, the main thing is that they must be planted after returning to green. After bolting not only consume large amounts of sugar, but also lignified roots, not suitable for raw materials for sugar. In order to avoid these adverse effects, they must be generally before bolting