Effect of continuous application of chicken manure on rice and wheat

A fixed position experiment of continuous application of chicken manure on rice and wheat was carried out from 1998 to 2001.The results indicate that the total yield of rice and wheat applying chicken manure（9～27t/hm²）to each crop continuously increases by 8.7%～20.1%.The growth rate is a downward trend as the time of continuous application is prolonged.The appropriate applying amount of the manure is 9～18t／hm² each crop，and 9t／hm² is better from the third year.The soil nutrient raises notably by continuous applying chicken manure，and the range is available P>available K>organic matter and total N，it is related to the amount of the manure.