磷肥肥粒对周围微域土壤pH的影响
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EFFECT OF PHOSPHORUS FERTILIZER GRANULE ON THE pH OF SOIL ADJACENT TO THE APPLICATION SITE
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    摘要:

    本文报告了常用的三种国产磷肥的饱和溶液的性质、组成及其施入土壤后对肥粒周围微域土壤pH的影响。普钙饱和溶液是强酸性的,pH为2.5左右,施入土壤后降低了所有供试土壤之微域pH值。钙镁磷肥饱和溶液则是强碱性的,pH为9.7左右,施入土壤后提高了所有供试土壤的微域pH值。而磷铵肥料的饱和溶液是中性的,pH为7.5左右,施入土壤后使黄土性土壤的微域pH下降但使中性水稻土和酸性红壤的微域pH上升。无论何种磷肥、何种土壤,其施肥前后微域pH变化值(△pH)之大小与土壤质地、缓冲性能及原来土壤pH值的高低有关。

    Abstract:

    Chemical composition of saturated solution of phosphate fertilisers commonly used in China have been evaluated.The data indicate that saturated solution of super phosphate (OSP) is a strong acid (pH=2.47) solution with high concentration of P(4650 ppm),accompanied.with certain Ca2+,Mg2+,K+,Fe2+,and Mn2+.The saturated solution of AP is a neutral solution (pH=7.44) with a concentration of P higher than OSP by 1-2 times (11,600 ppm-P).However,the solution of saturated serpentine phosphate (Ca-Mg-P) is an alkaline solution (pH=9.66) with very low concentration of P (less than 3 ppm).There is a strong effect of P-fertilizers on the pH of soil adjacent to the granule applird.OSP decreased the pH of all soils tested,Ca-Mg-P,however,increased the pH of all soils samples,on the other hand,AP increased the pH of neutral and acid soils but decreased the pH of the loess soils.ΔpH value (positive or negative) and the volume of soil affected by P-fertilizer depend on the soil texture,buffer capacity,and the initial pH difference between the saturated solution of P fertilizer and soil.In general,the heavier texture and the less initial pH difference resulting in the smaller ΔpH value and volume of soil affected,and vice versa.

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曹志洪,李庆逵.磷肥肥粒对周围微域土壤pH的影响[J].土壤学报,1987,24(3):226-231. Cao Zhihong, Li Chingkei. EFFECT OF PHOSPHORUS FERTILIZER GRANULE ON THE pH OF SOIL ADJACENT TO THE APPLICATION SITE[J]. Acta Pedologica Sinica,1987,24(3):226-231.

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  • 在线发布日期: 2013-02-25
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