Soil and water loss is an important way of nutrients loss.No tillage with mulching and ridge tillage can strongly decrease the loss of nutrients caused by surface runoff and soil erosion.The potential of nutrient loss through erosion is as follows:organic matter>total K>available K>total N>total P>hydrolysable N>available P.Strong leaching in upland of red soil is also an important way of nutrients loss,especially for N.The system with notillage and mulching has the largest surplus in compar...