Effect of soil conditioners on the improvement of acid soil characteristics and maize yield
Author:
Affiliation:
(1.Institute of Agricultural Resources and Environment，Jiangsu Academy of Agricultural Sciences，Nanjing Jiangsu 210014;2.College of Resources and Environment，Nanjing Agricultural University，Nanjing Jiangsu 210095;3.Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization，Nanjing Jiangsu 210095;4.Key Laboratory of Crop and Livestock Integrated Farming，Ministry of Agriculture and Rural Affairs，Nanjing Jiangsu 210014)
The aim of the study was to explore the improvement effect of compound conditioner on acid soil from Jiangsu hilly area and its effect on yield and nutrient accumulation on summer maize.A pot experiment was carried out to study the effects of combined application of inorganic fertilizers with different soil conditioners made from mature compost，straw ash，weathered coal mixed at 8∶1∶1(dry mass，T1)；9∶0.5∶0.5(T2)；7∶2∶1(T3)and 10∶0∶0(T4)on soil acidity and nutrient accumulation of maize.Soil treated with pure inorganic fertilizer was set up as the control(CK).The results showed that all treatments of soil conditioner combined with inorganic fertilizer significantly increased soil pH value and contents of total exchangeable base ions，and also significantly reduced the content of exchangeable aluminum in soil.The pH value of T4 treatment increased by 0.33，the content of exchangeable hydrogen and exchangeable aluminum in soil decreased by 48.73% and 29.17%，respectively，and the total amount of exchangeable base ions increased by 20.00%，compared with the control.The soil organic matter and available phosphorus of all treatments were improved，and the effect of T3 was the best among all treatments.Compared with the control，the contents of organic matter and available phosphorus were 23.78% and 42.71% higher in T3，respectively.Treatments with soil conditioners significantly increased the phosphorous accumulation in roots，stems，leaves and grains，and improved transportation of nitrogen from root to aboveground part of the plant.Treatments with soil conditioners also significantly increased plant yield.The yield of treatments with soil conditioners were increased by 23.2% in average compared with CK.The comprehensive analysis of soil improvement effect using entropy method showed that soil conditioner made from compost∶weathered coal∶straw ash mixed in a 7∶2∶1 ratio improved acidity of the acid soil in hilly areas and increased maize yield the most.It could be used as a conditioner for improving acidic soil in hilly areas of Jiangsu.