Alleviation effects of LaCl3 on photosynthetic characteristics of cucumber seedlings under nitrate stress Effects of LaCl3 and CPZ on Proline Accumulation of Rice Seedling under Drought and Salt Stresses Effects of Ca 2+ and nitric oxide on growth and active oxygen metabolismof cucumber seedlings under NaCl stress EFFECTS OF LaCl_3 TREATMENT ON WHEAT SEED GERMINATION AND SEEDLING GROWTH UNDER SIMULATED ACID RAIN CONDITION Kinetic Analysis of the Effect of Lanthanum Chloride on Potassium ion Exudation of Corn Root Segments