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作 者 ：郑杰炳1;2;王子芳1;高明1;魏朝富1;车福才1;欧阳柬3;唐书源3

期 刊 ：植物营养与肥料学报 2007年 13卷 5期 页码：941-947

关键词：熔渣；硅；磷；有效性；固定率；

Keywords:slag, silicon, phosphorus, availability, fixation rate,

摘 要 ：采用室内培养方法,研究了含硅熔渣与化肥混合对硅有效性与磷固定率的影响。结果表明,熔渣与化肥混合后,可溶性SiO₂含量与磷固定率表现出随水分含量增加而增加的趋势,当水分含量大于150.g/kg时其值增加不明显。NPK三因素配比对可溶性SiO₂含量影响最大,其次为双因素配比;且含P配比的增加效应更大,但N、K对磷固定率影响不明显。0.10.mm粒径熔渣可溶性SiO₂含量与磷固定率明显高于0.25、1.00.mm粒径熔渣,差异达到显著水平,而0.25.mm与1.00.mm粒径熔渣差异不显著。可溶性SiO₂含量与磷固定率随贮存时间的增长而增加,在10—20.d达到最大值,之后逐渐减小,但减小幅度较小,总体趋于稳定。磷的固定率与熔渣中Fe₂O₃、CaO、MgO含量呈正相关,而与熔渣中SiO₂、有效硅含量呈负相关,说明熔渣主要通过铁、钙、镁与磷发生吸附,且硅的存在可以有效降低磷的吸附。

Abstract:The effect of mixing slag and fertilizer on silicon availability and phosphorus fixation rate were studied with incubation experiments.The results showed that soluble SiO₂ and phosphorus fixation rate increased with moisture content,but didn‘t continue to increase after moisture content was higher than 150 g/kg.The greatest effect on soluble SiO₂ was NPK three-factor proportion,followed by two-factor proportion,and the proportion with P had a greater effect on increasing soluble SiO₂,while N,K had no evident effect on phosphate fixation rate.When the particle diameter was 0.10 mm,the soluble SiO₂ and phosphate fixation rate were significantly higher than 0.25 and 1.00 mm particle diameter.However,there was no significant difference between 0.25 and 1.00 mm particle diameter.The soluble SiO₂ and phosphate fixation rate increased along with increasing storage duration,whose maximum appeared between 10 and 20 days.Then they decreased gradually but slightly,and remained more or less constent.The phosphate fixation rate had a positive relationship with Fe₂O₃,CaO,MgO and had a negative relationship with SiO₂ and available silicon in the slag.It was proved that the slag adsorbed phosphate mainly through iron,calcium and magnesium,and the existence of silicon could reduce the absorption of phosphorus effectively.

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