冀北坝上地区荞麦品种的适宜播期分析

曹丽霞,赵世锋,周海涛,张新军,石碧红,刘君馨,李云霞,李天亮

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

Lixia Cao,Shifeng Zhao,Haitao Zhou,Xinjun Zhang,Bihong Shi,Junxin Liu,Yunxia Li,Tianliang Li

表1 2013-2015年气温情况（生育期内）

Table 1 The temperature in 2013-2015 (in the growth period) ℃

年份Year 5月May 6月June 7月July 8月August 11-20 21-31 1-10 11-20 21-30 1-10 11-20 21-31 1-10 11-20 21-31 2013 14.4 16.7 15.6 17.7 18.6 18.8 18.9 19.9 19.1 20.0 16.5 2014 10.8 18.4 15.1 16.6 17.0 19.3 19.8 20.9 19.3 16.5 16.7 2015 10.2 18.6 13.9 15.1 18.5 18.7 19.3 19.6 18.7 19.7 16.3 平均Average 11.8 17.9 14.9 16.5 18.0 18.9 19.3 20.1 19.0 18.7 16.5 标准差Standard deviation 2.27 1.04 0.87 1.31 0.90 0.32 0.45 0.68 0.31 1.94 0.20 变异系数Coefficient of variation 0.19 0.06 0.06 0.08 0.05 0.02 0.02 0.03 0.02 0.10 0.01