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4月5日至7月24日,每早播10天提早出苗6～10天,每增加10℃积温,约增产1％。早播种,甜菜能较早达到LAI3.0,生长中心提早转至根部,延长块根增长期。充分形成的同化器官,能充分利用7～8月份优越的气象条件,生产大量光合产物,为其高产创造物质基础;晚播LAI高峰期后移,生长中心转移晚,光合产物以较大份额用于地上部生长,向根部分配率低,导致低产低糖。块根产量与甜菜生育日数呈正相关,r=0.997。4月5日至15日,每早播10天增产8～11％,相邻播期产量差异均达到1％显著水平。
April 5 to July 24, every 10 days early emergence of seedlings 6 to 10 days, each increase of 10 ℃ accumulated temperature, about 1% increase. Early sowing, sugar beet LAI3.0 earlier, the growth center to the roots earlier, to extend root growth period. The fully formed assimilating organs can make full use of the superior meteorological conditions from July to August to produce a large amount of photosynthetic products and create a material basis for their high yield. Late peak LAI of late-seeding replaces later, the growth center shifts late, and the photosynthate takes a larger share Growing above the ground, low allocation rate to the roots, resulting in low yield and low sugar. The root yield of beet was positively correlated with the number of days of beet fertility, r = 0.997. From April 5 to April 15, the yield was increased by 8-11% every 10 days of early sowing, and the yield of adjacent sowing date reached a significant level of 1%.