Release characteristics and planting effects of promoted-release mixed phosphate and magnesium substrates
Four promoted-release materials (W,Y,QW,and FS) were chosen to activate the mixture of phosphate rock and calcined magnesium oxide.Type Ⅰ and type Ⅱ mixtures of promoted-release phosphate rock and calcined magnesium oxide were added to 3％ and 5％ promoted-release materials,respectively.Next,promoted-release mixed phosphate and magnesium substrates for herbaceous flowers were prepared,whereas a leaching experiment and a pot experiment were conducted to study the release characteristics of water-soluble P and Mg and their effects on growth and flowering of Torenia fournieri and Catharanthus roseus.The results were summarized as follows:1) As compared with the substrate without adding any promoted-release materials,the water-soluble P contents of promoted-release P-Mg substrates added with W,Y,QW,and FS were significantly increased by 15.42％ ～27.10％ (P＜0.05),whereas the water-soluble Mg content in treatments added with W,Y,QW,and FS showed no significant differences (P＞0.05).2) Promoted-release P-Mg substrates added with W Ⅰ increased the number of flowers of T.fournieri and the crown diameter,branch number,and above-ground biomass of C.roseus;substrates added with FS-Ⅱ promoted the accumulation of above-ground biomass of T.fournieri,but adding Y-Ⅰ showed no positive effects on the growth of T.fournieri or C.roseus.Generally,promoted-release W-Ⅰ and FS-Ⅱ showed positive effects on substrates of herbaceous flowers and the appropriate addition ratios were 3.09 and 3.16 kg · m-3,respectively.
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