Effects of tea branch biochar on soil fertility and cadmium absorption and transport in rice
The exploration of contaminated cultivated land treatment technology is an important measure to ensure the rational utilization of cultivated land and alleviate the shortage of resources.In this study,tea branch biochar was used to conduct field experiments in cadmium-contaminated paddy fields by setting three different amounts(3 000,6 000 and 9 000 kg·hm-2)to explore the effects of tea branch biochar on soil nutrients,available cadmium,rice growth and cadmium absorption and transport.The results showed that the 1000-grain weight,plant height and yield of medium dosage biochar treatment increased by 5.04%,9.00% and 3.77%,respectively,compared with the blank control treatment,and the grain cadmium content of medium dosage biochar treatment decreased by 46.67%,which significantly reduced the biological concentration factor and translocation factor of cadmium in rice.At the same time,the soil pH value of medium dosage biochar treatment increased by 0.23,the contents of organic matter,alkali-hydrolyzable nitrogen,available phosphorus and available potassium of medium dosage biochar treatment increased by 11.41%,13.77%,8.28% and 40.94%,respectively,and the content of available cadmium in soil of medium dosage biochar treatment decreased by 13.04% .In summary,when the amount of tea branch biochar was 6 000 kg·hm-2,the goal of increasing rice yield and reducing cadmium,and simultaneously improving soil fertility could be achieved,which could be promoted and applied as a safe utilization technical measure.
万方数据
维普
