硅钙钾镁肥及引入柠檬酸对红壤和潮土pH值及养分含量的影响

通过土壤培养试验研究了硅钙钾镁肥(SCPM)及引入柠檬酸的复混肥(CA-SCPM)在酸性红壤和石灰性潮土上的养分供给和酸碱度调节能力。硅钙钾镁肥添加量设置为6 g/kg,硅钙钾镁肥与柠檬酸(CA)的比例为88%∶12%。与对照处理相比,培养至150 d时,SCPM肥及CA-SCPM肥提高红壤pH值约1.16个单位,提高潮土pH值约0.19个单位。SCPM、CA-SCPM两个处理均能显著提高红壤速效钾、交换性钙镁、水溶性钙镁硅及有效硅含量;SCPM、CA-SCPM两个处理提高了潮土速效钾、有效硅及水溶性硅含量,却降低了潮土交换性钙镁、水溶性钙镁含量。CA对两种土壤养分有效性无明显影响。SCPM肥在红壤上的改良效果,体现在其提高pH值、盐基离子以及有效硅含量;在潮土上的积极效果主要表现在速效钾和有效硅含量的提高,将CA引入SCPM肥后综合效果更好。

Effects of silicon-calcium-potassium-magnesium fertilizer and the introduction of citric acid on soil pH and nutrient contents for red soil and fluvo-aquic soil

The soil incubation test was carried out to study the nutrient supply and acidity regulation ability of siliconcalcium-potassium-magnesium(SCPM)fertilizer and citric acid compound silicon-calcium-potossium-magnesium(CASCPM)fertilizer on the acid red soil and calcareous fluvo-aquic soil.The addition amount of SCPM fertilizer was 6 g/kg and the ratio of SCPM fertilizer and citric acid(CA)was 88%∶12%.Compared with control treatment,the pH value of red soil was increased by 1.16 units and the pH value of fluvo-aquic soil was increased by 0.19 units with the treatment of SCPM fertilizer and CA-SCPM fertilizer after 150 days of culture.For the red soil,SCPM and CA-SCPM treatments significantly increased the contents of available potassium,exchangeable calcium,exchangeable magnesium,soluble calcium,soluble magnesium,soluble silicon and available silicon.For the fluvo-aquic soil,SCPM and CA-SCPM treatments improved the contents of available potassium,available silicon and water-soluble silicon,but reduced the contents of exchangeable calcium,exchangeable magnesium,soluble calcium and soluble magnesium.CA had no significantly influence on the nutrient availability of two soils.The improvement effect of SCPM fertilizer on the red soil lies in an increase of soil pH,base cation content and available silicon content;while the positive effect on the fluvo-aquic soil mainly results from raised available potassium and silicon content,and the comprehensive effect is better when CA is introduced into SCPM fertilizer.