华北寒旱区作物轮作的生产效应

姚兆磊, 张继宗, 杜玉琼, 刘玉华, 张立峰

Productivity evaluation of crop rotation in cold and arid region of Northern China

Zhao-Lei YAO, Ji-Zong ZHANG, Yu-Qiong DU, Yu-Hua LIU, Li-Feng ZHANG

表1 试验小区种植方式

Table 1 Planting pattern of experimental plot

试验小区 Experimental plot 年份Year 试验小区 Experimental plot 年份Year 2015 2016 2017 2018 2019 2015 2016 2017 2018 2019 1 B P B P B 14 FB FM FB FM FB 2 O P O P O 15 P FM P FM P 3 FM P FM P FM 16 B O B O B 4 FB P FB P FB 17 O O O O O 5 P P P P P 18 FM O FM O FM 6 B FB B FB B 19 FB O FB O FB 7 O FB O FB O 20 P O P O P 8 FM FB FM FB FM 21 B B B B B 9 FB FB FB FB FB 22 O B O B O 10 P FB P FB P 23 FM B FM B FM 11 B FM B FM B 24 FB B FB B FB 12 O FM O FM O 25 P B P B P 13 FM FM FM FM FM — — — — — —