5Wu Ronggui,Mingzao.Summary of the international aymposium on present and future raw material and fertilizer sulphur requirements for China and recent findings from sulphur research in Northern China Current and,1995年
6刘存辉,Soil sulphur status and sulphate ferfilizer requirements in Southern China Current and future plant mutrient sulphur requirement,availability.and commercial issues for China,1995年,1页