In the condition of the equal weight N input, we researched the influence of nitrate-N space time differentiation and different type of N to Ch. cabbage nitrate content. Our conclusion is that the solubility is different among N fertilizer, also the quantity and form of moving is different. The sequence of moving down speed is nitrate-ca＞urea＞Sulphuric-NH4＞organic fertilizer. The type of N fertilizer is important to Ch. cabbage nitrate content. The sequence is urea＞Nitrate-Ca＞organic fertilizer＞Sulphuric-NH4. The Ch-cabbage accord to the national first order standard about nitrate content if we use Sulphuric-NH4 in the ripe times. It accords to the national second order standard about nitrate content if we use organic fertilizer in the ripe times. It accords to the national second order standard about nitrate content if we use urea or Nitrate-Ca. So Ch. cabbage nitrate content exceeded quota very serious. To know the nitrate roll up and change regular and how to control the nitrate content are very important to develop no social effects of pollution agriculture and improve people is life level.
