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Comparative studies on different germplasms of Platycodon grandiflorum -their intercross and new types and differentiation of flower and seed color A New Type of Embryo Sac in Cardiopteris and Its Systematic Implication Study on Original Forest Community in Nanyue of Hunan Province Ⅲ.Lithocarpus henryi Forest Primary studies of toxicity-reducing and efficacy-maintaining action of fungal fermentative products in Tripterygium wilfordii by a novel bi-directional Solidstate fungal fermentation Effect and mechanism of organic-inorganic compound fertilization on chemical fertilizer utilizationI. Effect of urea compounded with organic material on maize yield and fertilizer utilization Advances in studies on new type drug delivery system of vincristine mmonia volatilization characteristics of different kinds of high-nitrogen compound fertilizers and their effects on nitrogen balance Study on the enhancement and mechanism of organic-inorganic compound fertilization on inorganic fertilizer utilization II. Effects of ammonium phosphate combined with organic material on