1) Status of K and Mg content in China's tea soils

a) K status of main soil types of tea fields from China

*Soil type*	*lateritic*	*Lateritic red earth*	*Red earth*	*Yellow earth*	*Yellow-brown earth*	*Purple earth*	*Brown earth*
Total K %	0.05-0.64	0.07-1.34	0.39-1.77	0.13-1.94	0.44-2.12	0.56-4.52	0.83-2.01
Slowly available K ppm	33-100	25-125	83-249	75-2491	50-800	415-581
Available K ppm	20-133	25-58	42-125	66-208	41-178	66-249	80-184
K status	extremely low	very low	low	medium	medium	high	high
Main provinces	Hainan, Fujian, Yunnan, Guangxi	Yunnan, Guangxi, Guangdong, Fujian	Zhejiang, Jiangxi, Hunan, Guizhou, Anhui	Yunnan, Sichuan, Guizhou	Jiangsu, Anhui, Hubei	Sichuan	Shandong

b) Content of available Mg in different soil types of tea gardens in China

*Soil type*	*Brown earth*	*Yellow-brown earth*	*Red earth*	*Lateritic red earth*	*Laterite*
Range ppm	88.4-215.4	9.2-316.2	1.8-288.4	3.9-248	4.4-124.8
Mean ppm	125.4	94.2	35.3	22.3	17.1
Main provinces	Shandong	Anhui, Jiangsu, Hubei	Anhui, Zhejiang, Jiangxi, Fujian, Hunan	Guangdong, Fujian, Guangxi, Guizhou	Guangdong, Hainan, Fujian