Effects of Amendments on Rhizosphere Soil Nutrient Availability of Vegetable Under Cadmium Stress

The pot experiment of root bag method was used to study the effects of three amendments(lime,pig manure and superphosphate) on rhizosphere soil nutrient availability of vegetable(radish,lettuce and cowpea) under cadmium stress.The results showed that the pH value of vegetable rhizosphere soil were different due to different chemical properties of three amendments treatment.Compared with the control,three amendments improved rhizosphere soil available nutrient content of vegetable.The maximum hydrolysis nitrogen content of vegetable rhizosphere soil was high concentration treatment of pig manure,as the value was 43.28,36.72 and 48.24 mg/kg respectively.The maximum available phosphorus content of vegetable rhizosphere soil was high concentration treatment of superphosphate,as the value was 3.58,3.32 and 3.20 mg/kg respectively.The maximum available potassium content of vegetable rhizosphere soil was high treatment of pig manure,as the values was 53.15,55.94 and 61.85 mg/kg respectively.It was indicated that pig manure was the best amendment to improve soil compound nutrients of vegetable under cadmium stress.