Movement of soil nutrient of wheat field in arid desert area

The movement characteristics of soil nutrient of wheat field in arid desert area were studied. The results showed that the soil nutrient content reduced to a lower level after one growth season of wheat, and it decreased stage by stage. Every stage was synchronous with irrigation. Therefore, irrigation mainly induced the decline of soil nutrient in the soil layer. Most infiltrated nutrient was accumulated in subsoil. When total irrigation water amount was increased from 649mm to 1998mm, nutrient amount utilized by wheat crop was de clined 42%(sandy soil) and 50%(multi-soil) respectively and the total consumption of soil nutrient was declined 40%(sandy soil) and 49%(multi-soil) respectively. Much soil nutrient moved to deep soil layer where crop could not take any nutrient when the irrigating amount was too large.