... . It has been used widely in the tropics and subtropics areas of China where soil is poor. In that areas the sulfate decompose ... been proved that natural kieserite can increase yield 10~30% to tree, rubber tree, palm date tree, pineapple tree, banana tree ... , soybean, sweet potato, potato, rice, tobacco and so on.packing in 50kgbag; 1000kg bag; 50kg bag into 1mt big bag low ...