关键词: 有机肥, 连作, 长豇豆, 土壤养分, 土壤酶活性

Abstract: In order to study the effects of different fertilizers on soil nutrients and enzyme activities， the present study was conducted in the field， where asparagus bean was continuously planted for 3 years. It was shown that chemical fertilizers and organic manures could increase the content of soil organic matter， soil available nitrogen， phosphorus and potassium. Application of organic fertilizers could increase the soil pH， while chemical fertilizers significantly lowered soil pH. Compared with the control， organic fertilizers could increase the activity of the soil catalase， urease， polyphenol oxidase and sucrose， while the chemical fertilizer treatment decreased soil enzyme activity. In the harvest stage， soil enzyme activity reached the highest level， and the differences between the treatments were significant in this stage. Among all the fertilizers， the effect of chicken manure was the best， which was followed by pig manure.

Key words: organic fertilizer, continuous cropping, asparagus bean, soil nutrients, soil enzyme activity