Effects of density, fertility on the bolt yield of Brassica napus L
MA Meng-ya, ZHANG Ya-tao, YAN Guan-bo, HUANG Cheng, MA Chao-zhi
HUBEI AGRICULTURAL SCIENCES . 2020, (5): 20 -23 .  DOI: 10.14088/j.cnki.issn0439-8114.2020.05.004