fertilizer practice
2.(4) The high content of nitrogen and phosphorus as well as the more dynamic change of subsurface flow in tomato field and vegetable field indicted that the practice of fertilizer has a strong influence to the content of phosphorus and nitrogen in subsurface flow.
3.Nevertheless, use of soil incorporation for urea and anhydrous ammonia to reduce volatilization, the practice of delaying nitrogen fertilizer application in imperfectly drained soils to minimize denitrification and leaching, and patience in the case of immobilization will tend to resolve all these problems.
