Effects of Modified Biochar on Growth,Nutrients Uptake of Maize and Soil Physicochemical Properties

GUO Dayong; SHANG Dongyao; WANG Xugang; CHANG Huiqing; LIN Fan

doi:10.15933/j.cnki.1004-3268.2017.02.005

Abstract：To evaluate the effect of biochar and modified biochar on improving soil fertility,a greenhouse pot culture experiment was carried out to study the effects of biochar and modified biochar on growth and nutritional status of maize, soil physicochemical properties under different application levels [ 0 ( CK ) , 0. 5%,1%,2%] in alkaline and low organic matter soil. The results showed that compared to CK,modi-fied biochar increased ground dry weight and root dry weight, meanwhile significantly increased plant height and leaf area,2% level performed the best with increments of ground dry weight,root dry weight, maize height and leaf area by 31. 0%,61. 7%,35. 1% and 48. 2%,respectively. Biochar significantly de-creased maize ground dry weight and height,ground dry weight of 1% biochar and 2% biochar treatments were only 26. 9% and 29. 2% of CK. The 2% modified biochar significantly increased ground N,P,K up-take in maize,while biochar treatments decreased ground and root N,P,K uptake in maize. Both biochar types significantly increased soil organic matter contents,1% biochar and 2% biochar treatments signifi-cantly increased soil pH values by 0 . 25 and 0 . 28 , while 2% modified biochar treatment reached thehighest among modified biochar treatments with the increment of 0 . 10 . This research suggested biochar was better to be acid disposed when applied in alkaline and low organic matter soils to avoid the negative effects of biochar on the growth of crops,and 2% rate was recommended for practice.