The Roots of the Crop Usually Absorb and Utilize Studying to Nitrogen under the Maize/ Soybean Intercropping Condition
LIU Jun-xia, LU Yin-gang, YUAN Hong-wei, ZHANG Zhen-zhong, CUI Bao-wei
ACTA AGRICULTURAE BOREALI-SINICA . 2008, (1): 173 -175 .  DOI: 10.7668/hbnxb.2008.01.038