砂质土壤pH对中性缓释复合肥养分释放特性的影响研究

Effect on Nutrient Release Characteristics of Neutral Compound Slow Release Fertilizer by Sand Soil pH

采用连续恒温培养研究了30℃条件下砂质酸性、中性土壤对2种不同剂型中性缓释复合肥养分释放特性的影响。研究结果表明,中性缓释复合肥的养分累积量、拟合动力学方程参数b值及养分平均释放相对百分率的变化趋势,受砂质土壤pH的影响基本一致。随砂质土壤pH升高,两种中性缓释复合肥氮素和磷素释放速率、累积量和相对百分率变大;砂质土壤pH降低,中性缓释复合肥钾素释放速率、累积量和相对百分率变大。两个中性缓释复合肥的养分释放速率对于砂质土壤pH变化响应一致,均表现为:SRF1(有机无机型)<SRF2(无机型)。

Continuous constant temperature incubations were adopted to research the effect on nutrient release characteristics of two neutral compound slow release fertilizers(SRF_1 Inorganic-organic,SRF_2 Inorganic) by sand soil pH. The results indicated that the change trend of nutrient accumulation, dynamical equation b and relative percentage of nutrient release ratio of neutral compound slow release fertilizers were consistent. The nitrogen, phosphorus release velocity of SRF_1 (Inorganic-organic) and SRF_2 (Inorganic) increased with higher of sand soil pH and potassium release velocity of two neutral compound slow release fertilizers decreased with higher of sand soil pH. Additionally, nutrients release velocity of SRF_1 (Inorganic-organic) were smaller than those of SRF_2 (In-(organic).)