Analysis on the Difference of the Soil Fertility in Different Types of Grey Fluvo-aquic Soil in the First Terrace of Hanjiang River

[Objective] The study aimed to find out the nutrient status and variety law of first terrace in Hanjiang River and provide reference for determining soil and applying fertilizers.[Method] 40 samples were collected resp.from 3 soil types of grey fluvo-aquic sand soil,grey fluvo-aquic oil sand soil and grey fluvo-aquic clay soil in first terrace in Hanjiang River and their physical and chemical properties were determined and compared to analyze the difference on soil fertilizers in different types of grey fluvo-aquic soil in first terrace in Hanjiang River.[Result] On the grey fluvo-aquic soil,which was developed from the alluvial deposit in modern rivers,on the first terrace of the Hanjiang River,from loose grey fluvo-aquic sand soil at the front of the terrace to the tide grey fluvo-aquic clay at the back of the terrace,the pH value descended gradually,the soil properties changed from alkalinity to neuterity,the content of organic material and N,P,K increased gradually and the soil fertility also ascended gradually.The potassium content was all lacked in 3 soil types.[Conclusion] There is a difference on soil fertilizers in different types of grey fluvo-aquic oil in first terrace in Hanjiang River.The different fertilization mode should be adopted according the nutrient status of different soil types in production practice.