Effects of Long-term Application of Manure and Nitrogen on Soil Fertility and Sweet Pepper Yield

Less and more content of soil organic matter were found in long-term application of Nitrogen and combined application of nitrogen together with manure respectively.Available Nitrogen content increased in treatment with manure and Nitrogen,while almost no obvious improvement was found in treatment with inorganic nitrogen along.Available P and K were found decreased when treated with Nitrogen.Application of manure increased available K,but had no significant effects on Available P.Long-term Nitrogen fertilization led to low pH resulting in soil acidification.Application of organic manure resulted in better chemical and physical soil properties such as pH and porosity.The highest yield hit 37.23 kg.plot-1in treatment of organic manure and high level of Nitrogen.