Potassium sulphate induces resistance of rice against the root-knot nematode Meloidogynegraminicola oleh Mao-yan LIU, De-liang PENG, Wen SU, Chao XIANG, Jin-zhuo JIAN, Jie ZHAO, Huan PENG, Shi-ming LIU, Ling-an KONG, Liang-ying DAI, Wen-kun HUANG, Jing LIU