IIc Ping, Jin Jiyun and Lin Bao. 1999: Effect of N application rates on leaf senescence and its mechanism in spring maize. Chinese Agricultural Sciences. 89-95是什么意思_IIc Ping, Jin Jiyun and Lin Bao. 1999: Effect of N application rates on leaf senescence and its mechanism in spring maize. Chinese Agricultural Sciences. 89-95在线翻译_英语_读音_用法_例句