The sequence of Mo toxicity to lettuce was in agreement with that of Mo desorption. A power relationship was found between amount of Mo adsorbed (x)and critical value of Mo toxicity, the equation was igy=0.653+0.4281gx (r=0.9990).

• 不同土壤中钼对莴笋毒害的大小顺序与土壤对钼的吸附-解吸完全吻合；土壤吸钼量与毒性临界值之间呈幂函数关系:lgy=0.；653+0