Abstract:
Through the indoor thermostatic cultivation experiment, the paper studied the improvement of Lu Shan Mist tea garden soil the amelioration of biochar、limestone and its mixing ingredients. The results showed that biochar and biochar + limestone mixed modifier can increase the soil pH to the optimum range for high-quality tea garden, while limestone raised the soil pH too much so that it is out of the optimal range for tea tree growth. Biochar and biochar + limestone mixed modifier also have great effects on the accumulation of soil nutrients, and there is a significant difference between 2.5 g/kg biochar + 0.75 g/kg limestone mixed treatment and 5 g/kg biochar + 0.75 g/kg limestone mixed treatment. The contents of soil nutrients increased. with the increasing application of biochar. In all, applying 5g/kg biochar + 0.75g/kg limestone mix modifier can obtain the best improvement result with the comprehensive growth index increased from reference 1 to 1.35, of which the soil pH raised from 4.83 to 5.47,and soil organic matter, available phosphorus, alkaline hydrolysis nitrogen and CEC increasing by 49%,21%,21% and 64% respectively. Therefore, under this experimental condition, application of 5 g/kg biochar + 0.75 g/kg limestone mixed conditioner is the most effective method for improving Lu Shan mist tea garden soil.