Messick D L,Morris R J,Gabryszewski J M.Sulphur in crop producti on and sources to meet future requirements[A].Proceedings of the International Symposium on the Role of Sulfur,Magnesium and Micronutrients in Balanced Plant Nutrition[C].Chengdu:Chengdu science and technology university publishing comp any,1993.1-10.
[2]
Liu Chongqun.Soil sulfur status and sulfur fertilizer requiremen ts in China[A].Proceedings of the International Symposium on the Role of Sulfur,Magnesium and Micronutrients in Balanced Plant Nutrition[C].Chengdu: Chengdu science and technology university publishing company,1993.19-29.
Bissau B C,Tewatia R K.Role of sulfur in balanced plant nutritio n:Indian experience[A].Husinong.Proceedings of the International Symposium on the Role of Sulfur,Magnesium and Micronutrients in Balanced Plant Nutrition[C].Chengdu:Chengdu science and technology university publishing company,1993.98-10 6.
Dowel S,Porch S.A Systematic approach for determining soil nutri ent constrains and establishing balanced fertilizer recommendations for sustaine d high yields[A].In:SFI,CAAS Proceedings of the Soil International Symposium o n Balanced Fertilization[C].Beijing:Agricultural house,1988.8-12.
