关键词: 硅, 硅, 抑制, 白菜, 镉, 吸收

Abstract: Field experiment was carried out by planting four continuous stubbles of vegetable, in order to research the effects of fertilization on the yield of vegetable, fertilizer effect, the contents of NO3-N and NH4-N in soil. Experimental result shows that, the fresh yield of eatable part of vegetable increased along with adding the dosage of nitrogenous fertilizer in the four continuous stubbles of the designed field experiment. It also shows that the optimal dosages are 537.4 and 473.88 kg/hm2 for celery planting and cabbage planting, respectively. By contrast with the non-fertilization counterpart region, the contents of NH4-N increase along with adding the dosages of nitrogenous fertilizer, and the contents of NO3-N also increase with prolonging the planting time of vegetable. On the other hand, fertilization has changed the contents of NO3-N in soil profiles of counterpart regions after harvesting of four continuous stubbles. In the different treatments of fertilization，the contents of NO3-N have increasingly raised in the soil profiles of the fertilized regions. But the content of NO3-N decreased in soil profile of counterpart region without nitrogen fertilization. The experimental result can be used as a reference to guide proper fertilization in the continuous cropping vegetable soil.