Effects of fractionated nitrogen application on leaf senescence and 15N-urea uptake and utilization of apple rootstock―Malus hupenhensis
DING Ning, JIANG Yuan-Mao, WEI Shao-Chong, CHEN Qian, GE Shun-Feng
Chin J Plant Ecol . 2012, (12): 1286 -1292 .  DOI: 10.3724/SP.J.1258.2012.01286

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