Effects of Modified Phosphorus Tail Powder on Maize Growth and Soil Physicochemical Properties in Red Soil Habitat
The aims are to study the effects of modified phosphorus tail powder on the growth of maize and soil physicochemical properties in red soil habitat through corn field experiment,and to provide theoretical basis for the rational utilization of phosphorus tailings and the prevention and fertilization technology of acid red soil farmland.The experimental corn field was located in Jiuxian Town,Malong County,Qujing City.The following treatments were set up:(1)local customary fertilization(CK);(2)local customary fertilization+modified phosphorus tail powder 3000 kg/hm2(T1);(3)local customary fertilization+modified phosphorus tail powder 6000 kg/hm2(T2);(4)local customary fertilization+modified phosphorus tail powder 9000 kg/hm2(T3);(5)local customary fertilization+modified phosphorus tail powder 12000 kg/hm2(T4);(6)local customary fertilization+modified phosphorus tail powder 15000 kg/hm2(T5),each treatment was repeated 3 times,and the maize yield and soil physicochemical properties such as pH,organic matter,exchangeable calcium were measured.The results showed that the application of modified phosphorus tail powder significantly increased soil pH value,which was 23.20%higher than that of CK at the highest level,and significantly reduced the total amount of exchangeable acid,exchangeable Al3+content and available manganese content,which were 79%,70%and 29.18%lower than that of CK at the highest level,respectively.The application of modified phosphorus tail powder increased soil exchangeable calcium,which was 38.19%higher than that of CK at the highest level.The application of modified phosphorus tail powder increased the 100-grain weight by 4.03%compared with CK at the highest level,and had no significant effect on maize yield.The application of modified phosphorus tail powder can reduce soil acidification by reducing soil exchangeable acid,increasing cation exchange capacity and soil exchangeable calcium.The effects of different application rates of modified phosphorus tail powder on soil and maize differed.Among which the application of 6000 kg/hm2 modified phosphorus tail powder(T3 treatment)was the optimal fertilization scheme,which could improve soil physicochemical properties,reduce soil acidification degree and increase soil aggregate stability to the greatest extent without affecting maize yield.
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