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Sulphur Disbalance in Paddy Fields of Dehong Prefecture in Yunnan Province and Effects of Phosphorus-gypsum in Increasing Yields
Deng Chunzhang, Xu Yue, Xie Ke in, Jin Guifen, Hou Jianping, Pu Minchang
cje . 1989, (3): 49 -52 .