枸溶性钾肥对铅镉污染土壤芹菜生长及铅镉吸收的影响

笔者旨在研究不同钾肥对铅镉污染土壤上芹菜生长及重金属吸收的影响。通过芹菜盆栽试验得出，在铅镉污染土壤中，相同施钾量的枸溶性钾肥处理下的芹菜可获得水溶性钾肥处理下芹菜产量的80%左右；枸溶性钾肥可以提高土壤pH 0.6~0.7个单位，进而降低土壤中DTPA-Pb、DTPA-Cd含量，减少芹菜对铅镉的吸收和累积。因此，在铅镉污染土壤中，枸溶性钾肥显著促进芹菜生长，显著促进植物对钾的吸收，提高钾浓度。另外由于其特殊的理化性质，可以显著提高土壤的pH，进而降低土壤中重金属的有效性，减少作物对重金属的吸收，保证食品安全。

Effects of Citrate Acid Soluble Potash Fertilizer on Growth and Pb and Cd Uptake of Celery in Pb and Cd Contaminated Soil

The paper aims to study the effect of different potassium fertilizers on the growth and Pb and Cd uptake of celery in Pb and Cd contaminated soil. The results were obtained by pot experiments: with the same amount of potassium, citrate soluble potash treatment could obtain the yield which was about 80% of that under water soluble potash treatment in Pb and Cd contaminated soil; citrate soluble potash could increase soil pH about 0.6 to 0.7 units to reduce soil DTPA-Pb and DTPA-Cd content and decrease the absorption and accumulation of Pb and Cd of celery. Therefore, in Pb and Cd contaminated soil, citrate soluble potash could significantly promote the growth and potassium uptake of celery and increase the concentration of potassium. As for its special physical and chemical properties, citrate soluble potash could significantly raise soil pH, thereby reduce the availability of heavy metals in soil, and then decrease the absorption of heavy metals to ensure food safety.