冀北坝上地区荞麦品种的适宜播期分析

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Analysis of Suitable Sowing Date for Buckwheat Varieties in Bashang Area of Northern Hebei

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表2 2013-2015年降水量情况（生育期内）

Table 2 The precipitation in 2013-2015 (in the growth period) mm

年份Year 5月May 6月June 7月July 8月August 合计 Total 11-20 21-31 1-10 11-20 21-30 1-10 11-20 21-31 1-10 11-20 21-31 2013 0.00 5.80 44.20 8.80 28.80 49.20 48.10 36.90 16.80 17.10 26.00 281.70 2014 24.80 2.50 23.60 22.00 10.10 4.90 2.70 4.60 0.40 18.50 19.20 133.30 2015 4.00 0.00 15.10 19.50 19.30 5.50 12.30 14.50 23.80 5.70 5.90 125.60 平均Average 9.60 2.77 27.63 16.77 19.40 19.87 21.03 18.67 13.67 13.77 17.03 标准差Standard deviation 13.31 2.91 14.96 7.01 9.35 25.41 23.93 16.55 12.01 7.02 10.22 变异系数Coefficient of variation 1.39 1.05 0.54 0.42 0.48 1.28 1.14 0.89 0.88 0.51 0.60