论文部分内容阅读
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。
This paper reports the properties, composition, and effects of saturated solutions of three commonly used domestic phosphate fertilizers on the pH of the soil around the fertilizer grains after they are applied to the soil. Saturated calcium solution is strongly acidic, pH is about 2.5, applied to the soil to reduce the soil pH of all tested soil. The saturated solution of calcium magnesium phosphate fertilizer is strongly alkaline with a pH of about 9.7. After application to the soil, the pH of all the tested soils is increased. However, the saturated solution of ammonium phosphate fertilizers is neutral, with a pH of about 7.5. When applied to the soil, the pH of the loessial soil decreases but the pH of the neutral paddy soil and the acidic red soil increases. No matter what kind of phosphate fertilizer and what kind of soil, before and after fertilization, the change of pH value (△ pH) is related to the soil texture, buffer performance and the original soil pH value.