Effects of Different Ratios of N,P,K on Root Traits of Annual Platycodon grandiflorum
SUN Di1, FAN Huanjun1, SONG Ziye1, PIAO Jin1, LI Guanhao2, YAN Yizi1*
Journal of Agricultural Science and Technology . 2019, (12): 128 -133 .  DOI: 10.13304/j.nykjdb.2018.0769

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