Effects of Manure on Soil Water-Conversation and Fertilizer Betterment Winter Wheat Yield In Loess Plateau Dryland

Through a three year fixed field experiment,the results showed that applying manure had a significant fertilizing soil and water conversation effect;giving 112 500 kg/hm 2 amount of manure, the contents of soil organic matter;total N,available N,available P and available K increased individually 36.4%,21.7%,49.7%,16.2%,44.2%,the water content of 0~60 cm soil layer increased 5.5 mm;1 mm rainfall could producemore 1.83 kg wheat and water use efficiency increased 22%;wheat yield increased by 15.8%. There is a prominent correlation between the applying amount and yield.