Effect of Long-term P Fertilization on Wheat Yield of Loess Plateau
LI Hui-cheng, HAO Ming-de, HE Xiao-yan, SHI Pei
ACTA AGRICULTURAE BOREALI-SINICA . 2008, (S2): 279 -282 .  DOI: 10.7668/hbnxb.2008.S2.064