Nitrogen Forms in soil solution at different depths as affected by types of urea fertilizers applied in paddy season
WANG Xiaozhi, YIN Weiqin, CAI Yuqi, FENG Ke, ZHU Jianguo
Ecology and Environment . 2009, (4): 1516 -1521 .  DOI: 10.16258/j.cnki.1674-5906(2009)04-1516-06

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