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从1983年以来,我省春甜菜全部改为夏甜菜。夏甜菜多接小麦茬,故经春甜菜的播期拖后两个月左右。因为生育期短,所以夏甜菜要求早发,缩短苗期到叶丛快速生长期的时间,使叶片最大面积提前到来,以达到叶面积系数合理,光合势强的目的。但是,当前生产中存在着施肥问题;一是“浅”,二是“晚”。这是不符合夏甜菜生物学特性要求的,也不符合化肥特性要求。因为甜菜是直根系作物,肥料不在根系密集层就不能很好利用。另外,当前
Since 1983, the province has changed all its beets to summer beets. Summer beet more then wheat stubble, so the spring beet sowing delay about two months. Because of short growth period, so beet requires early onset, shorten the seedling to the rapid growth of leafy time, so that the largest leaf area came in advance in order to achieve a reasonable leaf area coefficient, photosynthesis potential. However, there are fertilization problems in current production; one is “light” and the other is “late.” This is not in line with the biological characteristics of summer beet requirements, nor does it meet the requirements of fertilizer characteristics. Because beets are straight-rooted crops, fertilizers are not well utilized not in dense root systems. In addition, currently