Effect of Different Nitrogen Application Rate on Soil Nitrate Nitrogen Distribution,Accumulation and Crop Yields of Northern China Plan
RU Shu-hua, ZHANG Guo-yin, SUN Shi-you, GENG Nuan, WANG Ling
ACTA AGRICULTURAE BOREALI-SINICA . 2012, (6): 172 -177 .  DOI: 10.3969/j.issn.1000-7091.2012.06.034