Effect of soil conditioner containing calcium,magnesium and phosphorus combined with biological agents on reducing acidification of protected red soil
[Objective]The present paper aimed to explore the effects of soil conditioners containing calcium,magnesium and phosphorus on acidification reduction and crop growth in protected red soil through field experiments.[Method]Using Italian lettuce as material,field plot experiment was carried out on protected red soil,and 5 treatments were set up:Control(local conventional fertilization),treatment T1(local conventional fertilization+calcium,magnesium and phosphorus soil conditioner 1500 kg/hm2),treatment T2(local conventional fertilization+calcium,magnesium and phosphorus soil conditioner 3000 kg/hm2),treatment T3(local conventional fertilization+calcium,magnesium and phosphorus soil conditioner 6000 kg/hm2),treatment MT3(local conventional fertilization+calcium,magnesium and phosphorus soil conditioner 6000 kg/hm2+biological bacteria agent).Each treatment was repeated 3 times.The agronomic traits and quality indexes of let-tuce,soil pH,soil organic matter and soil bacterial community diversity were determined.[Result]T3 treatment significantly increased the contents of soil organic matter,total phosphorus,available phosphorus and exchangeable calcium,especially total phosphorus(22.56％).Compared with CK,the pH,base saturation and Vc content of lettuce in T3 significantly increased by 0.7 units,257.14％and 14.40％,re-spectively,while the contents of exchangeable acid,exchangeable aluminum and available manganese significantly decreased by 600.00％,75.00％and 37.27％,respectively.Compared with the treatment of MT3,the hydrolytic nitrogen content,cation exchange capacity and let-tuce plant height significantly increased by 44.56％,4.01％and 11.29％,respectively.The key environmental factors affecting the main bacterial communities(phylum level)of the protected lettuce field were organic matter(29.8％),pH(24.9％)and available potassium(16.3％).[Conclusion]Applying 6000 kg/hm2 calcium-magnesium-phosphorus soil conditioner can increase the pH of protected red soil,reduce the exchangeable acid,exchangeable aluminum content,and soil acidification,improve soil fertility and bacterial community structure,moreover,its combined application with microbial bacterial agent can increase lettuce plant height and Vc content.
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