Effect of Fertilization Parameters on Winter Wheat Yields and Fertilizer Utilization Efficiency in Brown Soil Zone

Fertilizer parameter experiment of winter wheat was carried out in six towns of Zhaoyuan city.Results indicated that yield increase effect of phosphate fertilizer was tightly related to Olsen-P content.When Olsen-P content reached 20 mg/kg,phosphorus belonged to high fertility level.Wheat yield increased with the decrease of fast-acting potassium.When the content of fast-acting potassium was less than 80 mg/kg,economic benefit of potassium fertilization was the highest.In high,middle and low yield field,wheat yield of district-wide fertilizer field was the highest.And its N,P and K fertilizer utilization efficiency was higher than that in district-lack fertilizer field.Therefore,N,P and K fertilizer should be applied together in order to improve agricultural utilization efficiency of the fertilizer.