| Adopting the addition of phosphate solubelizing bacteria (PSB) and straw etc to protected soil could activate the content of metal elements needed by crops in the soil, and promote the absorption of trace elements by crops. In this experiment, four treatments were set up: control, straw, PSB, and PSB plus straw. The contents of calcium, magnesium, copper, iron and zinc in soil and seedlings were tested at different periods to determine the effects of PSB and straw on the contents of metal elements in soil and the uptake amount by cucumber seedlings. The results of the experiments showed that straw, PSB and straw plus PSB could significantly increase the ability of cucumber to absorb calcium, magnesium, iron and copper without affecting the absorption of zinc. Of them the treatment of straw plus PSB had the highest effect, the promotion were as high as 6.26%, 8.25%, and 11.57% respectively. The three treatments had no effect on the contents of calcium, magnesium and iron in the protected soil, but could significantly increased the contents of effective copper, zinc, and the content of effective copper during later stage of fruiting peak period increased by 12.19%, 15.41%, and 16.49% respectively as compared with the control, and the content of effective zinc during later stage of fruiting peak period increased by 38.8%, 33.26%, and 56.81% respectively as compared with the controlling area. |
